The method of hydrogen storage in harsh environments

 

(57) Abstract:

The method is designed to hold gases and can be used in chemical, petrochemical and refining industries. The method is carried out by partial recovery of the surface of gamma-alumina containing up to 1,281018/m2adsorbed anions of halogen acids and past pre-oxidation treatment at 500oWith the flow of oxygen, molecular, activated hydrogen or hydrogen-rich recycle gas at 100-750oC, a pressure of 1.0 to 10 ATM and gas humidity 10-5-10-1vol.%. Then carry out the storage of partially reconstructed gamma-alumina in air arbitrary humidity at temperatures up to 125oC, in vacuum or inert gas at a temperature of 750oC and humidity up to 10-5vol.% and subsequent oxidation of the partially restored the surface of gamma-alumina with water vapor at 125-750oWith inert gas at atmospheric pressure or in vacuum with a humidity of 10-5-10-2vol.%. This method allows you to extend the range of conditions for the storage of hydrogen while maintaining security and low cost.

Izaberete amatively industry.

Known methods of storing gases in compressed, liquid, absorbed and adsorbed state and in crystallohydrates form and in the form of chemically converted surface of solids [Fastiv Century A.D., Peter Y. C. , Rovinsky, A. E. Cryogenic engineering. M., 1974; Sidorenko M. C. Underground storage of gas. M. : Nedra, 1965; B. C. E., M.: Owls. encyclopedia, 1970, T. 2, S. 467; Weller, S. W. and A. A. Montagna Studies of Alumina 1. Reaction With Hudrogenat Elevated Temp. - J. Catal., 1971, v.21, 3, p.303-311; Y. Amenomiya Adsorption of Hydrogen and N2-D2Exchange Reaction on Alumina. - J. Catal., 1971, v.22, 1, p.109-122; Borisevich Y. P., Y. Fomichev Century, Lewinter M. E. a Study of the interaction of hydrogen with the surface-Al2ABOUT3in the conditions of variable humidity system. THE USSR ACADEMY OF SCIENCES. Journal of physical chemistry, 1985, vol.3; Borisevich Y. P., Y. Fomichev Century, Lewinter M. E. a Study of the interaction of hydrogen with the surface-Al2ABOUT3. Journal of physical chemistry, 1981, T. 55, vol.8, S. 2149-2151; Patent (Russian Federation) 2048435. The way long-term storage of hydrogen. Borisevich Y. P.].

The disadvantages of these methods as applied to hydrogen are: great technical complexity and high costs for liquefaction of hydrogen due to its very low boiling point, large losses in storage due to the same being is either pure hydrogen, any special devices for separation of gases, condensed at higher temperatures; the compression of hydrogen is also quite difficult and expensive process, which, although it minimizes losses during storage, but does not reduce fire and explosion hazard, which adds considerable complexity in the operation of vessels working under considerable pressure and are characterized by high intensity, in addition, receiving and storing compressed hydrogen requires its original purity; storage of hydrogen adsorbed and absorbed state in the technique almost never used (perhaps except in the case of its dissolution in palladium), because it is characterized by low holding capacity of all known adsorbents and absorbents, many of which are rare and precious substances (e.g., noble metals), often incomplete reversibility during desorption and the impossibility of long-term storage of hydrogen in this state as a result of technical inconvenience, and as a result of air oxidation; hydrogen storage in crystallohydrates the form of industrial importance (unlike petroleum gas) also has not, so as to receive and XP is kind of in the form of a partially reconstructed gamma-alumina industrial applications also have not received, since the laying of the hydrogen storage is only flowing hydrogen and only at atmospheric pressure, resulting in the total amount of hydrogen, "founded on storage, much smaller amounts of hydrogen consumed to restore the surface, and, accordingly, the amount of hydrogen, "received from the store, much less than the number of hydrogen it takes to restore the surface, either in order to increase the "storage capacity" donate range of storage conditions.

The closest in technical essence and the achieved effect to the present invention is a method of hydrogen storage [Patent (Russian Federation) 2125537 Method of hydrogen storage. Borisevich Y. P.], based on a partial recovery of gamma-alumina containing up to 3,71017/1 m2adsorbed anions of organic acids and the last pre-oxidation treatment at 500oWith the flow of oxygen or molecular active hydrogen, or hydrogen-containing hydrocarbon gas with subsequent oxidation of the surface water vapor, accompanied by hydrogen evolution. The disadvantages of this method are fundamental limitations on the storage temperature in air arbitrary humidity does not exceed 50oWith that obviously leaves much to be desired.

The aim of the invention is to expand the range of storage conditions partially restored gamma-alumina in air arbitrary humidity in the direction of tightening of thermal environment, while maintaining security and low costs associated with storage.

This goal is achieved is described by way of a partial recovery of gamma-alumina containing up to 1,281018/1 m2adsorbed anions of halogen acids and past pre-oxidation treatment at 500oWith the flow of oxygen in a confined space molecular active hydrogen or hydrogen-containing hydrocarbon gas with the freezing of generated water at a temperature of from 100 to 750oC, a pressure of from 1 to 10 ATM and gas humidity from 10-5up to 10-1vol.% ("bookmark hydrogen storage") with subsequent oxidation of the partially reconstructed gamma-aluminum oxide water vapor ("production of hydrogen from storage") at temperatures from 100 to 750oWith inert gas at atmospheric pressure or vacuum with humidity from 10-5up to 10-2vol.%, carried out after a short indusny arbitrary environment humidity at temperatures up to 125oWith, vacuum, or inert gas at arbitrary temperature 750oC and humidity up to 10-5vol.%.

The essential difference between the proposed method against known is that the first partial recovery of solid molecular or activated hydrogen, or hydrogen-containing hydrocarbon gas is carried out only after the pre-oxidation treatment at 500oWith the flow of oxygen, previously causing him through ion exchange to 1,281018/1 m2anions of halogen acids.

The novelty of the claimed technical solution is that as the storage of hydrogen is used partially restored after pre-oxidation treatment at 500oWith the flow of oxygen gamma-alumina containing on its surface to 1,281018/1 m2the halogen anions of acids caused by ion exchange, freezing released during the restoration of the water, which may then be stored in air, inert gas or vacuum, without losing the ability of hydrogen in strict compliance with a set amount of oxidation has been partially restored the valency [Pauling L. The Nature of the Chemical Bond, 3rd rd. ed., Cornell Univ. Press. Jthaca, New York, 1960, p.548] work charge in a stable ionic structure must be equal to or approximately equal to zero. Because of this requirement IT is better groups, instead of oxygen, the anionic layer, which, according to energy principles, should limit the surface of crystalline gamma-alumina is preferably a hydroxyl layer.

It is known that molecular and activated hydrogen at a temperature of from 100 to 750oAnd the humidity of the gas from 10-5up to 10-1vol.% in flow conditions could partially restore the surface of gamma-alumina [Borisevich Y. P. Interaction of hydrogen with the surface-Al2ABOUT3and its role in the processes of dehydrogenation and dehydrocyclization. The dissertation on competition of a scientific degree of Kida. chem. N. Minsk, Byelorussian Academy of Sciences, Institute of Physical-organic chemistry] . Since the interaction of hydrogen with gamma-alumina is accompanied incremental dehydroxylization surface compared to calcination in vacuum or inert gas environment in the same temperature range, the resulting surface defects are fundamentally different from surface defects, obtained by di question oxide to act as a "repository" of hydrogen. Degidroksilirovanie gamma-alumina in an inert atmosphere or vacuum, flowing through the mechanism proposed by J. B. Peri [Peri J. B. A Model for the Surface of Alumina.- J. Phys. Chem. in 1965 , v.69, 1, p.220-231], accompanied by the formation of the surface layer of the oxygen anions, whereas when degidroksilirovanie in a hydrogen environment, surface hydroxyl groups are removed much more of the (N2O), resulting in the exposed layer of positively charged ions of aluminum, which allows us to consider the interaction of alumina with hydrogen as the process of surface reconstruction.

Coating the surface of gamma-alumina ion exchange of the halogen anions of the acid remaining on the surface after oxidation treatment, will change the nature of the resulting defects, as it inevitably will change the conditions subsequent oxidation of the partially reconstructed surface, which in turn will move the temperature range of conditions for hydrogen storage, "founded on storage. Since the surface hydroxyl groups of alumina have a certain distribution of power basicity, when ion exchange them with halogen acids RA is that a large part of the surface hydroxyl groups of gamma-aluminum oxide, is usually stable under oxidizing treatment and the interaction with hydrogen, will be substituted for the acid anions, and this will inevitably lead to the emergence of a larger number of surface defects. The increase in the number of surface defects in this case is equivalent capacity "warehouse" that when applied halogen acids owing to the partial removal by ion exchange of hydroxyl groups that are most stable when restoring, but not able to withstand aqueous solution of halogen acids. The upper limit of the concentration is plotted anions of halogen acids (1,281018/1 m2) due to the concentration on the surface of gamma-alumina hydroxyl groups, usually resistant to surface reconstruction. The lower limit of the concentration of the applied anions of halogen acids (0/1 m2) due to the distinctive features of the proposed method.

For each temperature recovery the degree of removal of Oh-groups is determined by the humidity of the system. Moisture reduction system (freezing N2A) shift the equilibrium to the side of ustoichivogo is conducted on storage", increases. Increase humidity system shifts the equilibrium towards the hydration of the surface. The amount of hydrogen, which potentially implies the storage decreases. Thus, for each temperature recovery there is a limit humidity above which makes recovery impossible. With increasing temperature the recovery amount of hydrogen, which potentially implies deposited increases up to the maximum possible for the humidity system and specific surface of the sample of gamma-alumina. With the increase of the specific surface area of alumina "storage capacity", of course, increases (including the crushing of specimen) until the darkening of the surface during recovery. With increasing hydrogen pressure when you restore the storage capacity also increases, and the maximum capacity for the same value of the humidity system and specific surface area can be achieved at lower temperatures, because of the greater ease of removal of Oh-groups with increasing hydrogen pressure.

Application for recovery of activated hydrogen (activation may be liboni or platinum catalyst on the carrier, or, finally, with the help of radiation) further facilitates the process of restoring the surface of gamma-alumina due to the much higher reactivity of the activated hydrogen in comparison with the molecular allowing to achieve a single "storage capacity" for the same value of the humidity system, specific surface oxide and the pressure at much lower temperatures.

Finally, restore the surface of gamma-alumina is quite possible and the hydrogen-containing hydrocarbon gas (in the absence of oxygen in it, is able under these conditions to cause the opposite surface oxidation). The degree of recovery of the surface of gamma-alumina under other equal conditions determined by the partial pressure of free hydrogen and heavy hydrocarbons can cause partial nauglerozhivaniya the surface of gamma-alumina, which reduces the storage capacity".

Of course, to shift the equilibrium oxidation <--> restore the surface of gamma-alumina, carried out in a confined space (to conserve hydrogen) in the side surface restoration when "tab of the hydrogen storage requires vimo the market of liquid nitrogen. In this case, if the flow rate of hydrogen at the surface reconstruction of gamma-alumina is not the limiting factor, the process can be carried out on duct without freezing the resulting moisture. The upper temperature limit surface reconstruction of gamma-aluminum oxide (750o(C) is limited by the sintering of gamma-alumina. consequently the specific surface oxide (and hence, the "storage capacity") begin to decrease. The lower temperature limit recovery of the surface of gamma-alumina (100o(C) limited reactivity of hydrogen with respect to the alumina. The lower limit humidity of the gas in the recovery of gamma-alumina (10-5vol.%) limited technical difficulties deeper dehydration. The upper limit of the humidity of the gas in the recovery of gamma-aluminum oxide is limited by the shift in the equilibrium oxidation <--> surface reconstruction in the leftmost position at which no surface recovery becomes impossible, even at the highest temperatures patentable range. The lower limit of the hydrogen pressure (or partial pressure of hydrogen in the case of hydrocarbon hydrogen-containing gas) is 1 ATM further reducing the pressure potential of gamma-alumina remain almost entirely unrealized. The upper limit on the hydrogen pressure (10 ATM) is limited by technical difficulties for the compression of hydrogen, and most importantly, too deep to restore the surface of gamma-alumina, in which the future of the water vapor oxidation is impeded in patenting temperature range.

After restoring the surface of gamma-alumina ("bookmark hydrogen storage") and cooling to room temperature in the recovery environment oxide completely ready for the storage of hydrogen or in the air arbitrary humidity at temperatures up to 125oWith, either in vacuum or inert gas at arbitrary temperature (up to 750oC) and humidity up to 10-5vol.%.

The upper limit (125o(C) when storing the recovered oxide in the air caused by the impossibility of any water vapor concentration to cause significant oxidation of reduced surface gamma-aluminum oxide (hydrogen gas) to a specified temperature as a result of their lack of reactivity.

The upper limit of humidity (10-5vol.%) when storing the recovered oxide in vacuum or inert gas at arbitrary temperature (up to 750oC) also decided evritania restored surface (hydrogen evolution) until the beginning of sintering the oxide surface.

Production of hydrogen from storage associated with the oxidation of water vapor previously restored the surface of gamma-alumina, with a fully restored original hydroxyl cover is solid. The amount of hydrogen, "received from the vault" is determined by the depth of oxidation of previously restored the surface of gamma-alumina, which is proportional to the temperature and humidity of the environment during oxidation. For each degree of recovery of gamma-alumina, there is a limit humidity below which oxidation becomes impossible, and the limit of 10-5vol.%, above for any degree of recovery in the temperature range of oxidation 125-750oTo can be obtained all hydrogen, "laid previously deposited". The lower limit of the temperature during the oxidation of the surface of the pre-restored oxide gamma-aluminum oxide (125oC) due to the fact that at lower temperatures, even at the highest moisture system oxidation partially restored oxide may not be complete, that is, the amount of hydrogen, "retrieved from storage will be significantly less than the number of hydrogen "laid on storage. I (750oC) due to thermal stability of the surface of gamma-alumina by sintering, i.e., at higher temperatures a decrease in specific surface area gamma-alumina and, therefore, reduces the storage capacity to re-bookmark the hydrogen storage".

The lower limit humidity system in the oxidation of the surface of the pre-restored gamma-alumina (10-5vol.%) due to the reactivity of water vapour, which at lower concentrations is not able to fully oxidize the surface of gamma-alumina even at the highest temperatures (750oC), i.e., the amount of hydrogen, "retrieved from storage will be less than the number of hydrogen "laid down for safekeeping."

The upper limit of the humidity system in the oxidation of the surface of the pre-restored gamma-alumina (10-2vol.%) due to the reactivity of water vapor, which already at this concentration is able to fully extract the hydrogen from the storage even when not heating to the maximum temperature, so a further increase in humidity is just not practical.

The above mentioned disadvantages associated with granniescollege gamma-alumina after pre-oxidation treatment of the surface coated with the anions of halogen acids.

This technical solution provided in the proposed method.

Example 1. The sample (50 g) of gamma-aluminum oxide (0.2-0.5 mm) with a specific surface area of 200 m2/g in the closed volume was partially restored by molecular hydrogen (with the absorption of water formed by clinoptilolite, cooled with liquid nitrogen) when termoregulirovanija heated at 40oC/min to a temperature of 750oWith aged at 750oWith in an hour, a pressure of 1 ATM and gas humidity 10-5vol.%. When the exposure of a sample of gamma-aluminum oxide at 750oWith in an hour the pressure and humidity of hydrogen was maintained at the original level. After cooling in the recovery environment to room temperature and the two-month storage partially restored oxide in air arbitrary humidity (room conditions) at a temperature of up to 50oWith the oxide was treated with water vapor in helium environment (humidity 10-2vol.%) at atmospheric pressure and termoregulirovanija (40oC/min) heated to 750oC. After an hour of exposure at 750oTo store received 4 l H2(N. y.)/1 l of gamma-alumina. Thus, example 1 is a standard (does not contain the totality sum method of storing hydrogen under mild conditions (storage temperature did not exceed 50o(C) without modification of the surface anions of inorganic acids [Patent (Russian Federation) 2125537 Method of hydrogen storage. Borisevich Y. P.]

Example 2. Unlike example 1, the temperature when storing partially restored sample of gamma-alumina was changed to 125oC. From the storage was obtained 3,52 l H2(N. y.)/1 l of gamma-alumina. Thus, example 2 is the pattern (does not contain the whole set of essential features, reflected in the claims) to compare the claimed invention with the known method of storing hydrogen using a gamma-aluminum oxide without surface modification anions of inorganic acids, but with stricter conditions of storage (storage temperatures reached 125oC).

Example 3. In contrast to example 1 on the surface of the sample of gamma-alumina ion exchange has been applied from an aqueous solution 1,281018/1 m2anions of hydrochloric acid, and the sample after drying was subjected to a preliminary oxidation treatment at 500oWith the oxygen flow. Store received 2 l of N2(N. y.)/1 l of gamma-alumina. Thus, the "storage capacity" compared to Etalon and soft recovery (1 ATM).

Example 4. Unlike example 3, the temperature when storing partially restored sample of gamma-alumina was changed to 125oC. From the store received 2 l of H2(N. y.)/1 l of gamma-alumina. Thus, the "storage capacity" compared to the benchmark decreased by 42%. Therefore, the claimed invention is inferior to the method and under severe storage conditions, but still soft recovery (1 ATM).

Example 5. Unlike example 3, the surface of the sample of gamma-alumina was applied 0,641018/1 m2anions of hydrochloric acid. Store received 3 l H2(N. W. )/1 l of gamma-alumina. Thus, the storage capacity was reduced only by 25%; but it's still worse than a known way.

Example 6. Unlike example 3, the surface of the sample of gamma-alumina ion exchange has been applied from an aqueous solution 1,281018/1 m2anions of hydrofluoric acid. From the storage was obtained 2.4 l H2(N. W. )/1 l of gamma-alumina. Thus, replacement of inorganic anions only slightly increased the storage capacity, which is still below the standard.

Example 7. Unlike preps>2(N. y.)/1 l of gamma-alumina. Thus, example 7 also serves as a standard (does not contain the whole set of essential features, reflected in the claims) to compare the claimed invention with the known method of storing hydrogen under mild conditions, but under severe conditions recovery (10 ATM).

Example 8. Unlike example 3, a partial restoration of the surface of gamma-alumina was carried out at 10 ATM. Store received 14 l H2(N. y.)/1 l of gamma-alumina. Thus, when the harsh conditions of completing (and still soft storage conditions) advantages of the proposed method begin to emerge. Storage capacity increases by 40%.

Example 9. Unlike example 2, the partial restoration of the surface of gamma-alumina was carried out at 10 ATM. Store received 8 l H2(N. W. )/1 l of gamma-alumina. Thus, example 9 also serves as a standard (does not contain the whole set of essential features, reflected in the claims) to compare the claimed invention with the known method of hydrogen storage in harsh environments and under severe conditions recovery (10 ATM).

Example 10. In Lima received 12 l H2(N. y.)/1 l of gamma-alumina. Thus, when the harsh conditions of recovery and hard storage conditions) advantages of the proposed method are shown in full. The storage capacity is increased by 50%.

Example 11. Unlike example 1 partial recovery of gamma-alumina was carried out at 5 ATM. From the storage was obtained 7 l H2(N. y.)/1 l of gamma-aluminum oxide.

Example 12. Unlike example 1 was used for the partial surface recovery of gamma-alumina with a specific surface area of 400 m2/year Of storage was obtained 8 l H2(N. y.)/1 l of gamma-aluminum oxide.

Example 13. Unlike example 1 for the partial recovery of the surface was used gamma-alumina with a specific surface area of 300 m2/year Of storage was obtained 6 l H2(N. y.)/1 l of gamma-aluminum oxide.

Example 14. Unlike example 1, a partial restoration of the surface of gamma-alumina was carried out at a relative humidity of 10-1vol.%. From the storage was obtained 0.34 l H2(N. y.)/1 l of gamma-aluminum oxide.

Example 15. Unlike example 1, a partial surface reconstruction was carried out with the humidity system is unlike example 1, a partial restoration of the surface of gamma-alumina was carried out at 600oC. From the storage was obtained with 0.2 l of H2(N. y.)/1 l of gamma-aluminum oxide.

Example 17. Unlike example 1, a partial restoration of the surface of gamma-alumina was carried out with hydrogen, carbon on platinum catalyst at 100oC. From the storage was obtained 1 l H2(N. y.)/1 l of gamma-aluminum oxide.

Example 18. In contrast to example 14 partial recovery of the surface of gamma-alumina was carried out at 750oC. From the store received 12 l H2(N. y.)/1 l of gamma-aluminum oxide.

Example 19. In contrast to example 18 on the surface of the sample of gamma-alumina was applied 1,281018/1 m2anions of hydrochloric acid. From the store received a 6.2 l H2(N. y.)/1 l of gamma-aluminum oxide.

Example 20. Unlike example 1, a partial restoration of the surface of gamma-alumina was carried out by treating petroleum gas (85% vol. H2and 15 vol.% CH4). From the storage was obtained 3,75 l H2(N. y.)/1 l of gamma-aluminum oxide.

Example. 21. Unlike example 1, the recovered alumina was kept for 1.5 years. From the storage was obtained 3,95 l H2(N. y.)/1 l of gamma-aluminum oxide.

P. which was obtained in (4.1 l H2(N. W. )/1 l of gamma-aluminum oxide.

Example 23. Unlike example 1, the recovered alumina was kept in the helium environment at arbitrary (up to 750oC) temperature and humidity systems up to 10-5vol.%. From the storage was obtained in (4.1 l H2(N. y.)/1 l of gamma-aluminum oxide.

Example 24. Unlike example 1 production of hydrogen from the storage was carried out at a relative humidity of 10-5vol.%. From the storage was obtained 0,22 l H2(N. y.)/1 l of gamma-aluminum oxide.

Example 25. Unlike example 1 production of hydrogen from the storage was carried out at a relative humidity of 10is 3.5vol.%. From the storage was obtained 1,3 l H2(N. y.)/1 l of gamma-aluminum oxide.

Example 26. Unlike example 1 production of hydrogen from the storage was carried out at termoregulirovanija heated to 125oAnd the shutter speed at 125oC for 1 h Of storage was obtained with 0.2 l of H2(N. y.)/1 l of gamma-aluminum oxide.

Example 27. Unlike example 1 production of hydrogen from the storage was carried out at termoregulirovanija heated to 400oC. From the storage was obtained 1,85 l H2(N. y.)/1 l of gamma-aluminum oxide.

Example 28. Unlike example 1 receiving the l H2(N. y.)/1 l of gamma-aluminum oxide.

Example 29. The sample (50 g) of gamma-aluminum oxide (0.2-0.5 mm) with a specific surface area of 200 m2/g, which surface using ion exchange from aqueous solution was applied 1,281018/1 m2anions of hydrochloric acid, after drying, was subjected to an oxidizing treatment at 500oWith the flow of oxygen with the subsequent partial recovery of the surface in the closed volume of molecular hydrogen (with pre-cooled in a stream of oxygen and the inert purge gas at room temperature and absorption generated when restoring water clinoptilolite, cooled with liquid nitrogen) when termoregulirovanija heated at 40oC/min to a temperature of 750oWith aged at 750oWith in an hour, a pressure of 1 ATM and gas humidity 10-5about. %. When the exposure of a sample of gamma-aluminum oxide at 750oWith in an hour the pressure and humidity of hydrogen was maintained at the original level. After cooling in the recovery environment to room temperature, purging with an inert gas at room temperature and two-month storage partially restored oxide in air arbitrary humidity (to the 10-2about. %) at atmospheric pressure and termoregulirovanija (40oC/min) heated to 750oC. After an hour of exposure at 750oC and cooling in the oxidation environment to room temperature there was obtained 2 l H2(N. W. )/1 l of gamma-aluminum oxide.

Lists and examples 1-29 data obtained by laboratory study of the processes of oxidation <--> restore real samples of gamma-aluminum oxide.

From the above examples, we conclude that when tightening the storage and recovery of gamma-alumina advantages of the patented method (manifested in the increase in storage capacity while maintaining safety and low cost become APPARENT.

The method of storing hydrogen in severe conditions including partial recovery of gamma-alumina with a specific surface area of 200-400 m2/g molecular active hydrogen or hydrogen-containing hydrocarbon gas at 100-750oC, a pressure of 1-10 ATM and gas humidity 10-5-10-1about. % with freezing of generated water, the storage of partially reconstructed gamma-alumina in air arbitrary humidity at temperatures up to 125oC, in vacuum or environment is set gamma alumina with water vapor at 125-750oWith inert gas at atmospheric pressure or in vacuum with a humidity of 10-5-10-2about. %, characterized in that the partial restoration of the subject after the pre-oxidation treatment at 500oWith the flow of oxygen gamma-alumina containing on its surface to 1,281018/1 m2the halogen anions of acids caused by ion exchange, and the storage of partially reconstructed gamma-aluminum oxide in air is carried out at temperatures up to 125oC.

 

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9 cl

FIELD: interaction substance technology.

SUBSTANCE: preparation of porous nanostructure of silicon consists in forming pores in silicon-containing base wherein silicon is present in the form of one of three stable isomers, summary content of the two remaining isotopes not exceeding half their natural occurrence. For example, if 28Si is present, base can include 29Si and 30Si isotopes in sum not exceeding 3.5%; if 29Si is present, base can include 28Si and 30Si isotopes not exceeding in sum 47%; and if 30Si is present, base can include 28Si and 29Si isotopes not exceeding in sum 48%.

EFFECT: increased atomic homogeneity of porous silicon nanostructure resulting in improved quality of porous layer, which enables realization of certain nuclear physical effects.

4 cl, 2 ex

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