Method for obtaining modified photocatalyst based on titanium dioxide

FIELD: chemistry.

SUBSTANCE: method of obtaining a modified photocatalyst based on titanium dioxide for the photocatalytic air purification, consisting in the fact that the nanocrystalline powder of titanium dioxide in the anatase modification with a specific surface area above 300 m2/g is subjected to treatment with an aqueous solution of the fluorine-containing agent in a molar ratio of fluorinated agent and titanium dioxide of 0.09-0.11:1 with the subsequent processing of the slurry with a mineral acid to achieve pH=4-4.5.

EFFECT: obtaining a highly active photocatalyst, allowing to reduce the time required in the purification of air from volatile organic compounds and intermediates of incomplete oxidation in the course of photocatalysis, 2 or more times by increasing the speed of photocatalytic oxidation.

4 cl, 1 tbl, 10 ex

 



 

Same patents:

FIELD: chemistry.

SUBSTANCE: first step includes obtaining low-hydroxylated insoluble fullerenols by reacting concentrated fullerene solution in o-xylene with aqueous ammonia solution in the presence of a tetrabutylammonium hydroxide phase-transfer catalyst at 35-40C. At the second step, the obtained low-hydroxylated insoluble fullerenols are hydroxylated to transform them into a water-soluble form by mixing with 6-15% aqueous hydrogen peroxide solution and heating for 4-5 hours at 65C. Water-soluble fullerenols are then precipitated from an alcohol-containing solution.

EFFECT: simplifying the method while preserving quality characteristics and full extraction of the end product.

2 cl, 1 dwg, 4 tbl, 3 ex

FIELD: chemistry.

SUBSTANCE: invention relates to nanotechnology, particularly a method of producing aspirin nanocapsules in a carrageenan envelope. The disclosed method includes preparing an aspirin suspension in benzene; dispersing the obtained mixture into a carrageenan suspension in butanol in the presence of an E472c preparation while mixing at 1000 rps; adding tetrachloromethane; filtering the obtained nanocapsule suspension and drying at room temperature.

EFFECT: method provides a simpler and faster process of producing nanocapsules and increases mass output.

1 dwg, 4 ex

FIELD: chemistry.

SUBSTANCE: invention relates to encapsulation, particularly to a method of producing albendazole nanocapsules in a sodium alginate envelope. The disclosed method includes adding albendazole to a sodium alginate suspension in hexane in the presence of an E472c preparation while mixing at 1000 rps. The weight ratio of albendazole and sodium alginate is 1:3 or 3:1. Further, 1,2-dichloroethane is added. The obtained suspension of nanocapsules is filtered, washed and dried. The process of producing the nanocapsules is carried out at 25C for 20 minutes.

EFFECT: invention provides a simpler and faster process of producing nanocapsules, reduces losses during production thereof (high mass output).

3 ex, 1 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to encapsulation, particularly a method of producing resveratrol nanocapsules in an envelope made of low- or highly esterified apple or citrus pectin. According to the disclosed method, resveratrol is dispersed in a suspension of low- or highly esterified apple or citrus pectin in benzene in the presence of an E472c preparation while stirring at 1000 rps. Tetrachloromethane is then added. The obtained suspension of nanocapsules is filtered and dried. The process of producing the nanocapsules is carried out at 25C for 10 minutes.

EFFECT: invention provides a simpler and faster process of producing nanocapsules, reduces losses during production thereof (high mass output).

9 ex, 1 dwg

FIELD: nanotechnology.

SUBSTANCE: according to the invention method, albendazole is added to the suspension of sodium alginate in butanol in the presence of the preparation E472s when stirring at 1000 revolutions per second. The mass ratio of albendazole and sodium alginate is 1:3 or 3:1. Then acetonitrile is added. The resulting suspension of the nanocapsules is filtered, washed, and dried. The process of production of nanocapsules is carried out at 25C for 20 min.

EFFECT: simplification and acceleration of the process of production of nanocapsules, reduction of losses in their production.

1 dwg, 2 ex

FIELD: chemistry.

SUBSTANCE: according to the method a suspension of resveratrol in heptane was dispersed into a suspension of xanthan gum in butanol in the presence of E472c under stirring at the rate of 1000 rev/s. A mixture of benzene and water taken at a volume ratio of 5:1 or 3:1 was added to the said suspension. The resulted suspension of nanocapsules was filtered, washed and dried. The process was performed at a temperature of 25C within 10 min.

EFFECT: simplified and fast process of nanocapsule production, reduced process losses.

4 ex, 2 dwg

FIELD: nanotechnology.

SUBSTANCE: suspension of aspirin in benzene is produced. The resulting mixture is dispersed into suspension of sodium alginate in butanol in the presence of the preparation E472s when stirring at 1000 rpm/sec. Then chloroform is poured, the resulting suspension of nanocapsules is filtered and dried at room temperature.

EFFECT: simplification and acceleration of the process of production of the nanocapsules, and increase in the yield by weight.

1 dwg, 4 ex

FIELD: medicine.

SUBSTANCE: invention represents a method for preparing a sterile nanoemulsion of perfluororganic compounds (PFOC) involving: adding a PFOC mixture to an aqueous solution of a stabilising agent; homogenising the PFOC mixture with the aqueous solution of the stabilising agent to produce a PFOC pre-emulsion; mixing the PFOC pre-emulsion with a salt-water solution to produce the PFOC nanoemulsion; keeping the PFOC nanoemulsion at a temperature from 2 to 10C for at least 18 hours. The method can be also implemented as follows: pre-filling a circulation loop of a PFOC nanoemulsion generating plant with the aqueous solution of the stabilising agent; adding the PFOC mixture to the aqueous solution of the stabilising agent; homogenising the PFOC mixture with the aqueous solution of the stabilising agent to produce the PFOC pre-emulsion; mixing the PFOC pre-emulsion with the salt-water solution to produce the PFOC nanoemulsion.

EFFECT: higher stability of the PFOC emulsion and prolonging the storage life.

30 cl, 7 ex, 5 tbl, 1 dwg

FIELD: nanotechnology.

SUBSTANCE: shell of the nanocapsules is used as apple or citrus high- or low-esterified pectin, and the core - as L-arginine. According to the inventive method, L-arginine is suspended in benzene, the resulting mixture is dispersed into a suspension of apple or citrus high- or low-esterified pectin in benzene in the presence of the preparation E472s while stirring 1000 revolutions per second. Then carbon tetrachloride is added, the resulting suspension of the nanocapsules is filtered and dried at room temperature. The process is carried out for 15 minutes.

EFFECT: simplification and acceleration of the process of producing the nanocapsules, and increase in the yield by weight.

6 ex

FIELD: nanotechnology.

SUBSTANCE: method of production of nanocapsules of vitamin in sodium alginate is characterized in that the shell is used as sodium alginate, and the core - as the vitamin, in a weight ratio of core:shell as 1:3. According to the method of preparing the nanocapsules the vitamin is added to a suspension of sodium alginate in benzene in the presence of the preparation E472s while stirring at 1300 rev/sec. Then hexane is added, the resulting suspension is filtered and dried at room temperature.

EFFECT: simplification and acceleration of the process of production of the nanocapsules, and increase in the yield by weight.

3 dwg, 8 ex

FIELD: chemistry.

SUBSTANCE: invention relates to catalyst of selective hydrodesulphurisation of olefin-containing hydrocarbon raw material. Said catalyst consists of compounds of metals Co or Ni, Mo and Na or K, applied on carrier. Claimed catalyst contains bimetal complex compound of metals Co or Ni, Mo and Na or K, carboxylic acid, containing, at least, one carboxyl group and 1-20 carbon atoms; it has specific surface 180-350 m2/g, volume of pores 0.3-1.1 cm3/g, average pore diameter 5.5-11.0 nm. Invention relates to method of preparing claimed catalyst, as well as to process of selective hydrodesulphurisation with its application.

EFFECT: claimed catalyst makes it possible to obtain petrol with ultralow content of sulphur and preservation of value of its octane number at initial level.

14 cl, 3 tbl, 9 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a method of preparing a catalyst for deep hydrofining of oil fractions. The present method includes impregnating an aluminium oxide support with a solution of compounds of metals of groups VIII and VI with pH of the impregnating solution of 1.5-5.0, vacuum treatment of the support before contact thereof with the impregnating solution, using impregnation at high temperature. The starting compounds used for preparing the impregnating solution are sodium salts Mo and one of modifiers X selected from the group (B, P, Si, V, Zn, Ge, Sn), which are soluble in water in molar ratio Mo/X=12/1, after which the solution is passed through a column with a cationite in H+ form and Co or Ni acetate is added to said solution.

EFFECT: disclosed method enables to obtain catalysts having high activity and selectivity with respect to hydrodesulfurisation, hydrodenitrogenation and hydrogenation of olefins and aromatic compounds.

2 cl, 5 tbl, 11 ex

FIELD: chemistry.

SUBSTANCE: method includes preparation of carrier by thermal processing at 500C, application of alcohol film-generating solution by method of stretching at rate 100 mm/min, drying at 60C for 1 h and annealing at 750C for 4 h. Film-generating solution is applied on fibreglass carrier by method of soaking with further drying at 60C for 1 h and annealing at 600-750C for 1 h. Catalyst, which is obtained in form of cloth, is cut at output in accordance with reactor shape and packed in layers at angle of 20-30, with formation of honeycomb structure, with the following component ratio in film-generating solution, wt %: Ce(NO3)36H2O - from 6.0 to 12.0, SnCl45H2O - from 16.6 to 22.3, C6H4OHCOOH - from 9.1 to 10.0, 96%-by weight C2H5OH - the remaining part.

EFFECT: method makes it possible to obtain catalysts, characterised by high permeability of gas mixture flow.

2 dwg, 4 ex

FIELD: chemistry.

SUBSTANCE: claimed invention relates to a method of obtaining a catalyst for the selective catalytic reduction of NOx in a flue gas, containing an alkali metal, with the application of ammonia as the reducing agent, with the catalyst containing a surface with catalytically active centres of Bronsted or Lewis acids, with the surface being, at least, partially covered with a coating, containing, at least, one metal oxide, and the said method includes the supply of a carrier, impregnation of the carrier with the first water solution, containing a vanadium component, drying and calcination of the impregnated carrier, covering the impregnated carrier with the second water suspension, containing, at least, one oxide of a basic metal, representing MgO, and drying and calcination of the coated carrier for the second time.

EFFECT: obtaining the catalyst with an improved resistance to poisoning with alkali metals.

7 cl, 6 dwg, 4 ex

FIELD: chemistry.

SUBSTANCE: invention relates to the field of chemistry and chemical technology, and namely, to processes of processing a gaseous hydrocarbon raw material and obtaining technical hydrogen for chemical, metallurgical, automobile, aircraft and other fields of industry, scientific research, precision engineering, instrument-making, synthesis of materials for microelectronics, initial raw material for hydrogen power engineering and power for fuel cells, etc. by the method of steam catalytic conversion of hydrocarbons (methane). Claimed is a catalyst of the steam conversion of hydrocarbons of the following composition (vol %): nickel oxide - 10-70; zircon oxide - 30-90; to 10 vol % powder of carbonyl nickel and/or to 10 vol % of nichrome powder of grade PC20H80. Claimed is a method of obtaining the catalyst, in the presence of which, fractions 30-100 mcm are separated from nickel NiO oxides powder and zircon Zr2O, respectively, mixed in a specified volume ratio, powder of carbonyl nickel and/or nichrome powder of grade PC20H80 is added, then subjected to conglomeration, with the realisation of plasma spraying of the obtained mixture on a preliminarily prepared surface, grounded with metal nickel and/or nichrome powder.

EFFECT: increase of the efficiency and reliability of the catalyst and the increase of the process selectivity.

2 cl, 5 ex

FIELD: engines and pumps.

SUBSTANCE: invention relates to a manufacturing method of a honeycomb ceramic unit for a catalytic neutraliser of exhaust gases, according to which to the ceramic unit from the main material there applied is a binding layer containing sodium silicate Na2O(SiO2)n or potassium silicate K2O(SiO2)n, or their mixture, above which there formed is at least one substrate layer for application of a catalyst, which contains a nanodispersed oxide of aluminium hydroxide (boehmite); for that purpose, a suspension layer is applied onto the second workpiece, which contains nanodispersed oxide of aluminium hydroxide; the workpiece with the applied suspension layer is dried; after that, the workpiece of the honeycomb ceramic unit with the applied substrate material is roasted, and therefore, a honeycomb ceramic unit for a catalytic neutraliser of exhaust gases is obtained. In addition, an application method of substrate onto the honeycomb ceramic unit for the catalytic neutraliser of exhaust gases, which applies this technology, is proposed.

EFFECT: improvement of passage of a gas flow through pores and channels of a substrate; increase and optimisation of a catalytic neutralisation process of substances in exhaust gases of diesel engines.

17 cl, 24 dwg, 1 ex

FIELD: chemistry.

SUBSTANCE: invention refers to a catalyst for hydrocarbon material hydroprocessing. The presented catalyst comprises an amorphous alumina-based carrier, phosphorus, at least one dialkyl(C1-C4)succinate, acetic acid and a functional group with a hydrogenation/dehydrogenation ability containing at least one group VIB element and at least one group VIII element specified in cobalt and/or nickel. The Raman spectrum of the above catalyst has characteristic bands of at least one Keggin heteropolyanionwithin the range of 990 and/or 974 cm-1, characteristic bands of said succinate and a principal characteristic band of acetic acid within 896 cm-1. The invention also refers to a method for producing this catalyst and to the catalyst produced by this method, as well as to a method for hydrocarbon material hydroprocessing in the presence of this catalyst.

EFFECT: presented catalyst possesses overactivity shown in hydroprocessing by the synergetic action of a combination of acetic acid and dimethylsuccinate.

24 cl, 2 dwg, 5 tbl, 12 ex

FIELD: chemistry.

SUBSTANCE: problem is solved by using graphite oxide functionalised by ethylene amide as a carrier. The described method for preparing a palladium-containing hydrogenation catalyst by coating a carbon nanomaterial with a bivalent palladium salt (PdCl2) followed by reducing to zero-valent palladium by sodium borane in the hydrogen medium, differs by the fact that the used carbon nanomaterial is graphite oxide modified by ethylene amide and prepared by boiling a graphite oxide suspension in butanol-1 in the presence of excessive ethylene amine. The palladium content in the catalyst makes 4.8-5 wt %. The catalyst is stable in the standard environment and keeps being active at long air storage, as well as maintains its activity after repeated hydrogenation cycles involving no regeneration.

EFFECT: creating the palladium-containing hydrogenation catalyst, wherein the palladium particles have a nanometre size and are uniformly distributed over the carrier surface.

2 cl, 3 ex

Catalysts // 2551433

FIELD: chemistry.

SUBSTANCE: claimed is method of obtaining catalyst precursor. Method of obtaining catalyst precursor includes: obtaining suspension, which includes liquid carrier, dissoluble metal salt, particles of insoluble inorganic metal salt and particles and/or one or more bodies of preliminarily formed catalyst supporters, with precipitation of metal from insoluble metal salt on supporter particles due to chemisorptions, and with precipitation of metal from soluble metal salt inside and/or on supporter particles due to impregnation, with chemisorptions and impregnation being realised simultaneously, and metals in insoluble inorganic metal salt and in soluble metal salt being the same and representing Co or Ni, with said metal being active catalyst component, with formation of processed catalyst supporter, and removal of liquid carrier from suspension with obtaining dries processed catalyst supporter, which either represents catalyst precursor directly, or optionally is subjected to calcinations to obtain catalyst precursor. Also claimed are: method of catalyst obtaining, method of synthesising hydrocarbons, method of hydration.

EFFECT: method is economical, provides obtaining required dispersion with high load on strong supporter.

14 cl, 1 tbl, 4 dwg, 23 ex

FIELD: chemistry.

SUBSTANCE: invention relates to an ammonia synthesis catalyst. Said catalyst is a supported metal catalyst which is deposited on a mayenite-type compound, containing conduction electrons in concentration of 1015 cm-3 or higher and serving as a support for the ammonia synthesis catalyst. The invention also relates to a method of producing said catalyst and an ammonia synthesis method using said catalyst.

EFFECT: disclosed catalyst enables synthesis of ammonia with high efficiency in mild conditions.

7 cl, 1 dwg, 4 tbl, 11 ex

Reforming catalyst // 2558150

FIELD: chemistry.

SUBSTANCE: invention relates to method of reforming with application of catalyst. Described is method of reforming hydrocarbons with water vapour, including contact of supplied gas in reactor of catalytic partial oxidation or installation for autothermal reforming. Reactor operates at temperature 800-1600C and pressure of 20-100 bar. Egg shell type catalyst, consisting of active compound in form of alloy of nickel and one metal from iridium and ruthenium, on supporter, containing aluminium oxide, zirconium dioxide, magnesium oxide, titanium dioxide or their combinations. Catalyst has cylindrical shape and has one or several through holes, where distance from centre to external catalyst surface constitutes from 10 to 40 mm, catalyst height constitutes from 10 to 40 mm, with diameter of one or several through holes constituting from 3 to 30 mm. At least 90 wt % of iridium or ruthenium in catalyst are located in external envelope which has depth up to 10% of external catalyst surface or to 10% of periphery of one or several through holes of catalyst.

EFFECT: realisation of method of catalytic partial oxidation or autothermal reforming at reduced drop of pressure in catalyst layer without reduction of catalyst activity.

12 cl, 5 dwg, 2 tbl, 5 ex

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