The catalyst for the oxidation of carbon monoxide
(57) Abstract:The invention relates to the purification of gases from environmentally hazardous components. The catalyst for the oxidation of carbon monoxide comprises a catalytically active oxides and metals found in defective microchannel plates containing oxides of silicon, lead, boron, barium, arsenic, aluminum, calcium, bismuth, magnesium, sodium, potassium, coated on the surface of the wafer by a monolayer of metal. The invention allows to increase the degree of purification of exhaust gases with simultaneous efficiency and reduce the cost of manufacturing microchannel plates. table 2. The invention relates to the purification of gases from environmentally hazardous components and can be used for purification of exhaust gases of an internal combustion engine for neutralization of exhaust gases of industrial enterprises, power plants, asphalt plants and other process industries and aggregates containing in its composition monoxide.Known catalyst for cleaning exhaust gas containing carbon monoxide, which is a mixture of the oxide or oxides of manganese and an oxide or oxides of lead [SU 450388, 30.11.74, 01 J 23/34].The disadvantage of the catalyst is the necessity of its manufacture, cost of materials and production.Object of the invention is the use of waste microchannel plates (MCC) used in electronic technology to enhance e-streams, as inexpensive and efficient catalyst for the oxidation of carbon monoxide.The technical result that can be achieved by carrying out the invention, lies in the high degree of purification of exhaust gases from environmentally hazardous components with simultaneous effectiveness of the process.This technical result is achieved by the fact that in the known catalyst for the oxidation of carbon monoxide, comprising a catalytically active oxides and metals, use of defective microchannel plate containing oxides of silicon, lead, boron, barium, arsenic, aluminum, calcium, bismuth, magnesium, sodium, potassium, coated on the surface of the wafer by a monolayer of metal.The essence of the catalytic effect of MCP is that in the process of formation of the ITUC be helices esteem in the process of oxidation of carbon monoxide.Examples of practical application.As the catalyst used defective MCP.To obtain MCP use materials whose chemical composition is presented in table. 1. The production of MCP includes pulling the thin filaments of the table. 1 heated materials in a specific combination, the etching in hydrochloric acid, heated in hydrogen at an elevated temperature, surface spraying powder of one or more metals (in this example, chromium).For the generation of carbon monoxide used stove, which burned wood particle material by the incomplete combustion of fuel. From the furnace the obtained gas mixture was passed through an absorption flask with concentrated sulfuric acid, and then through the condenser - absorber with 10% aqueous solution Paon, through britholite with glass balls and collected in the bladder, where the gas mixture passed through the U-shaped glass tube with a diameter of 15 mm with a catalyst, which was placed in a sand bath with electric. The gas mixture was controlled by the content of carbon monoxide gas analyzer brand APA - 121 at the entrance to the U-shaped tube (before catalyst) and exits the C tube purified gas was performed using a mercury thermometer.MCP weight of 0.48 g) was placed in a U-shaped tube through which passed the gas to be cleaned. The velocity of the gas was regulated so that the gas and powder created a "fluidized bed" in one of the bends of the tubes and thus created the maximum possible contact between the catalyst surface and the cleaned gas. Due to the high density MCP and low-speed gas flow catalyst carryover minor and controlled by the filter, filled with glass wool.In table. 2 shows the results of purification of gas from carbon monoxide for various operating conditions of the catalyst.Example 1 (table. 2, experiment 1).From the data table. 2 it follows that if the temperature of the catalyst 80oAnd gas 22oDuring the time 6 is removed 55%.Example 2 (table. 2, experiment 2).From the data table. 2 it follows that if the temperature of the catalyst 100oAnd gas 24oDuring the time 6 is removed 65%.Example 3 (table. 2, experiment 3).From the data table. 2 it follows that if the temperature of the catalyst 150oAnd gas 27oDuring the time 6 is removed 74%.Example 4 (table. 2, the experience of 4).From the data table. 2 it follows that if the temperature of the catalyst 200oWith gas and 30oDuring the time the lyst less than 100oWith the degree of purification of gas WITH greater than 50%, with increasing temperature of the catalyst for purification of gas WITH increases and at a temperature of 250oWith reaches 90-97% when the gas flow rate 0,35-0,50 DM3/min, the mass of catalyst is negligible.Compared with the prototype rejected the use of microchannel plates (marriage is more than 50%), as an inexpensive and efficient catalyst for the oxidation of carbon monoxide does not require additional expenses for its manufacturing. At high marriage in the production of MCP using unsuitable products for the intended purpose, and as an oxidation catalyst reduces the cost of manufacture of the MCP. The catalyst for the oxidation of carbon monoxide, comprising a catalytically active oxides and metals, characterized in that the catalyst used defective microchannel plate containing oxides of silicon, lead, boron, barium, arsenic, aluminum, calcium, bismuth, magnesium, sodium, potassium, coated on the surface of the wafer by a monolayer of metal.
FIELD: petrochemical process catalysts.
SUBSTANCE: preparation of catalyst comprises applying palladium compound onto silica cloth and heat treatment. Palladium compound is applied by circulation of toluene or aqueous palladium acetate solution through fixed carrier bed until palladium content achieved 0.01 to 0.5%. Palladium is introduced into cloth in dozed mode at velocity preferably between 0.1 and 5.9 mg Pd/h per 1 g catalyst. Heat treatment includes drying at temperature not higher than 150oC under nitrogen or in air and calcination in air or nitrogen-hydrogen mixture flow at temperature not higher than 450oC. Original silica cloth can be modified with 0.6 to 6.5% alumina. Palladium is uniformly distributed in silica cloth and has particle size preferably no larger than 15 Å. Invention can be used in treatment of industrial gas emissions and automobile exhaust to remove hydrocarbons.
EFFECT: deepened oxidation of hydrocarbons.
5 cl, 1 tbl, 4 ex