The catalyst for ozone decomposition
(57) Abstract:The invention relates to heterogeneous catalysts for ozone decomposition and can be used in the production involving ozone: wastewater treatment and processing of semiconductors in the microelectronics industry, etc. the Task of the invention is to provide a catalyst for ozone decomposition activity is in a humid environment exceeds the activity of the known catalyst at 25 and 50%, respectively. The problem is solved by the proposed composition of the catalyst, in the following ratio of components, %: Mn3O47 - 20; CuO 3 - 10; NiO 30 - 50; Calum 30 - 40 (mono and dialuminum calcium). Thus, the proposed composition of the catalyst increases the ratio of decomposition of ozone in dry and humid environments, respectively, at 25 and 50%, which will allow to gain a deeper degree of purification of gas emissions from residual ozone or decrease the amount of used catalyst. table 1. The invention relates to heterogeneous catalysts for ozone decomposition and can be used in industries involving ozone: wastewater treatment and processing of semiconductors in the microelectronics industry, etc.A known catalyst for the decomposition of ozone is humid environment g (0.4 to 0,6)10-4.The objective of the invention is to provide a catalyst for ozone decomposition activity is in a humid environment exceeds the activity of the known catalyst at 25 and 50%, respectively.The problem is solved by the proposed composition of the catalyst in the following ratio of components, Mn3O47 20; CuO 3 10; NiO 30 - 50; taluma 30 40 (mono and dialuminum calcium).The difference of the proposed catalyst for the decomposition of ozone from the prototype is that it as the active component further comprises an oxide of Nickel, an oxide of manganese Mn3O4, in the following ratio, wt. Mn3O47 20; CuO 3 10; NiO 30 50; Calum 40. It is established that the introduction of the catalyst of Nickel oxide in the range of 30 to 50% and the remaining components in the above limits increases the activity of the catalyst in dry and wet environment at 25 and 50%, respectively.The proposed catalyst is produced by mixing the three basic carbonates of the above metals and taluma, pressed into pellets, hydrothermal treatment and subsequent annealing. The proposed catalyst can be called gopalam-H.Example 1. Shredded about what ETP 5 mm and a height of 6 mm under a pressure of 4 t/cm2. Next, the tablets were subjected to hydrothermal treatment at a temperature of 80oC for 6 h, dried at a temperature of 120oC for 6 h and was progulivali at a temperature of 420oC for 6 hours composition of the obtained catalyst, Tulum 40; NiO 30; CuO 10; Mn3O420.The synthesized catalyst was used for the decomposition of ozone in dry and wet ozone-oxygen mixtures.Test conditions catalysts:
the rate of ozone-oxygen mixture 150 l/h,
the input concentration (0.5 to 1%).For a measure of catalyst activity took the activity coefficient g (coefficient of ozone decomposition), showing the proportion of dissolved molecules in the collision with the surface of the catalyst in the total number of collisions with the surface. The activity coefficient g was calculated by the formula:
< / BR>where space velocity, cm3;
Co inlet concentration of O3;
C output the concentration of O3;
Vtthermal velocity of the molecules cm/s;
S the external surface of the catalyst, cm2.The activity of preparation of the catalyst in the dry and wet gas 2.610-4and 1.010-4respectively.The synthesis of the catalyst in examples 2 to 4 conduct is vnesti obtained catalysts proposed in the table.Thus, the proposed composition of the catalyst increases the ratio of decomposition of ozone in dry and humid environments, respectively, at 25 and 50% that will allow you to gain a deeper degree of purification of gas emissions from residual ozone or decrease the amount of used catalyst. The catalyst for the decomposition of ozone containing oxides of manganese, copper and Tulum, characterized in that it further comprises Nickel oxide, and the oxide contains manganese oxide manganese at the following content, wt.Oxide of manganese 7 20
Nickel oxide 30 50
The copper oxide 3 10
Tulum 30 40
SUBSTANCE: invention relates to a homogeneous catalyst based on tetra-4-(4'-carboxyphenylsulphanium)-5-cobalt nitrophtalocyanine(II) of tetrasodium salt of formula .
EFFECT: invention allows to produce a compound having a high catalytic activity in the oxidation of sodium diethyldithiocarbamate.
4 dwg, 1 tbl, 2 ex
SUBSTANCE: nanotubular materials crystallising in the system of K2O-TiO2-X-H2O (X=NiO, MgO, Al2O3, Cr2O3, CO2O3, Fe2O3) are characterized by the fact that in their composition up to 10% of ions Ti4+ is replaced by doping two- or trivalent metal. The method of synthesis of nanotubular materials is characterized by the fact that the synthesis of the samples is carried out by hydrothermal treatment of a pre-prepared mixture of hydroxide in KOH solution, to produce the initial mixtures of hydroxides, a solution of titanyl chloride synthesised by reaction of TiCl4 with chilled distilled water, is mixed with aqueous solutions of salts of finished elements in a predetermined ratio, and then the precipitation of hydroxides is produced by adding NH4OH to the aqueous solution mixture at pH=9-9.5 followed by washing with distilled water, drying at 70-90°C and mechanical crushing, then the crushed precipitate is mixed with 10 M KOH solution and subjected to a hydrothermal treatment at 170-180°C for, at least, 24 hours, after which the resulting product is washed with distilled water.
EFFECT: invention makes it possible to synthesise potassium-titanate nanotubes with an average outer diameter of 5 to 12 nm.
2 cl, 5 dwg, 2 ex
SUBSTANCE: method of growing diamond single-crystals doped with nitrogen and phosphorus at high pressures of 5.5-6.0 GPa and temperatures of 1600-1750°C is carried out on the seed crystal, which is pre-pressed into a substrate of cesium chloride and separated from the source of carbon, nitrogen, and phosphorus with the metal-solvent, which is used as an alloy of iron, aluminium, and carbon. Between the source of carbon, nitrogen, and phosphorus and the seed crystal, a temperature difference of 20-50°C is created. The alloy of iron, aluminium, and carbon in the metal-solvent is taken with the following component ratio, wt %: iron 92.5-95.0; aluminium 2.5-0.5; carbon 5.0-4.0. The mixture of the source of carbon, nitrogen, and phosphorus is taken with the following component ratio, wt %: carbon (graphite) 95.0-97.0; phosphorus 5.0-3.0; adsorbed nitrogen 0.001±0.0005. Heating is carried out up to the initial temperature in a zone of growth at 100-250°C higher the melting temperature of the alloy of the metal-solvent, the exposure is produced at this temperature for 50 to 150 h. The mass flow rate of crystal growth is more than 2 mg/h. The technical result consists in the controlled doping the diamond single- crystal grown on the seed with impurities of phosphorus and nitrogen in the conditions of influence of high pressure and temperature.
EFFECT: resulting large diamond single-crystals contain a nitrogen admixture in the concentration of 0,1-17,8 parts per million of carbon atoms and phosphorus in a concentration of 0,5-5 parts per million of carbon atoms.
2 dwg, 3 ex
SUBSTANCE: urea-containing solution (13) is produced in the section (10) of synthesis, the solution is purified in the section (14) of extraction, and an aqueous solution (15) containing mostly urea and water, which is produced from the above-mentioned section of the extraction is subjected to the concentration process. Herewith the concentration process includes a separation step through an elective membrane.
EFFECT: improvement of the current urea production process.
9 cl, 1 dwg