The method of preparation of the catalyst of co afterburning

 

(57) Abstract:

Usage: in catalytic chemistry, in particular in methods for producing catalyst for the afterburning of carbon monoxide. The inventive method involves immersing molded workpiece from zhelezorudnogo composite (graphite content of 0.5-3 wt.%) in solution (-C3H5PtCl)4, (-C3H5PdCl)2, (-C3H5PdClPPh3) in a hydrocarbon solvent. The concentration of the solution is 6-10 g metal/L. After 20-30 min the workpiece is removed, dried at room temperature and calcined at 750-850C in air atmosphere for 2-4 hours, the Concentration of sorbed metal in the surface layer is 510-6-2,510-5g metal /g composite. In the oxidation of carbon monoxide obtained catalyst provides the conversion of carbon monoxide 85-90 mol.%. 1 C.p. f-crystals, 1 table.

The invention relates to the field of catalysis, in particular, to devices for afterburning of CO in the household burners and method of manufacturing such a device.

For the last decades is the dramatic deterioration of the overall environmental situation due to increased emissions of combustion products into the atmosphere, uhusiano diesel fuels, when burned, which formed such a harmful and dangerous products, such as sulfur and nitrogen oxides, soot and carbon monoxide. The latter is especially dangerous because of the lack of smell and the color of his presence, especially in confined spaces may only be determined with the help of special instruments. Average daily maximum permissible concentration of carbon monoxide in dwellings should be 1 mg/m3, and the maximum single 6 mg/m3.

Attempt to develop catalysts that promote more complete combustion of the fuel, and the reduction in the result, the CO content in the flue gases was done a long time ago. So, after tightening of the requirements for the composition of exhaust gases from internal combustion engines appeared catalysers of CO and other contaminants, which are designed to work on power installations, in particular for purifying exhaust gases of diesel engines. One of the tenets of such catalyst is applied on a solid, sometimes porous composite intermediate layer consisting of aluminum oxide, sometimes in mixtures with oxides of rare earth elements, which cause the catalytically active elements, such as platinum group metals.

Also described is a catalyst for purification of exhaust gases and a method thereof. The catalyst was prepared by forming on the surface of the carrier layer containing the catalytically active components and coated with aluminum oxide, this layer is injected silicon carbide and/or titanium dioxide, which has a higher thermal conductivity than aluminum oxide. In particular, the catalyst to purify the exhaust gases produced by the deposition of catalytically active components, such as platinum or palladium on a surface of the carrier cell structure and simultaneously forming a coating layer of aluminum oxide, additionally containing oxide of silicon or titanium. The introduction of these oxides improves thermal properties of the catalyst.

Described is a catalyst for oxidation of carbon monoxide consisting of titanium oxide, impregnated compound of platinum or palladium. The impregnation is carried out in the atmosphere of a reducing gas, can also be applied in a colloidal solution on a monolithic material.

A common disadvantage of the known cat is tick porous layer of catalytically inactive oxide and the subsequent introduction of the catalytically active components.

The aim of the invention is the simplification of the manufacture of the catalyst WITH afterburning.

This goal is achieved by using a method of obtaining a catalyst WITH afterburning, including the stage of impregnation of the solid substrate compounds of the platinum group metal, drying and firing, characterized in that as the substrate used geliographity composite containing 0.5-3 wt.% graphite and having a pore volume of 10-30%, which is immersed in a hydrocarbon solution of the compound of the platinum group metal, followed by drying in air and firing.

Unexpectedly, it was found that geliographity composite has a high affinity for hydrocarbon solutions of platinum group metals, which allows you to provide direct impregnation of the composite, and sorption on it a catalytically active amount of metal without creating an intermediate porous layer, necessary for the well-known catalysts of this type.

When using geliographity composites containing less than 0.5 wt. % of graphite or having a porosity below 10 vol.%, receive catalysts with low activity. The increase in the content of graphite above 3 wt.% or porosity higher than 30 vol.% cost is not the LASS="ptx2">

The method is as follows.

Form the workpiece from zhelezorudnogo composite containing 0.5-3 wt. % graphite by: a) mixing iron powder (GOST 9849-74), graphite powder (GOST 4404-78), zinc stearate (TU 6-09-4262-76, 1.5 wt.% ); b) pressing the mixture in an effort to 500 tons; C) sintering the mixture at a maximum temperature of 1130 10aboutC. the Formed blank from jaleshwaritala composite is immersed in a solution (C3H5tCl)4, ( -C3H4PdCl)2, ( -C3H5PdClPPh3) in a hydrocarbon solvent. The concentration of the solution is usually 6-10 g metal/L. After 20-30 min the workpiece is removed, dried at room temperature and calcined at 750-850aboutC in air atmosphere for a period of 2-4 . The concentration of sorbed metal in the surface layer of about 5 to 10-6-2,5 10-5g metal/g composite.

Samples of the catalysts tested for ignition WITH: a) a model gas containing 92% vol. N2, 6.% CO and 4% vol. ABOUT2b) in the flame of domestic gas with artificial feeding.

The invention is illustrated in the following examples, which show how the invention can be implemented in practice, but not ogranichivaut solution (C3H5dCl2) in benzene containing 6 g/l, and leave in the solution for 20 minutes then dried in air and then conducting heat treatment at 800aboutC. the concentration of the adsorbed Pd in the surface layer is 10-5 g Pd/g composite. (Sample 1).

P R I m m e R 2. The catalyst is prepared analogously to example 1, but using the solution (C3H5dCl)2in benzene containing 10 g of PD/l Concentration of adsorbed PD 1.7 10-5g PD/g composite. (Sample 2).

P R I m e R 3. The catalyst is prepared analogously to example 1, but using the solution (C3H5dCl)2in benzene containing 3 g of PD/l Concentration of adsorbed Pd 2.5 10-5g PD/g composite. (Sample 3).

P R I m e R 4 (comparative). The catalyst is prepared analogously to example 1, but using the solution (C3H5dCl)2in benzene containing 3 g of PD/l Concentration of adsorbed PD is 5 10-6g PD/g composite. (Sample 4).

P R I m e R 5. The catalyst is prepared analogously to example 1, but using geliographity composite with graphite content of 0.5 wt.% porosity of 20%. The concentration of the adsorbed PD is 10-5PD/g composite. (The image is from a graphite content of 3 wt.% porosity of 20%. The concentration of PD is 10-5PD/g campsite. (Sample 6).

P R I m e R 7 (comparative). The catalyst is prepared analogously to example 1, but using geliographity composite containing 0.1 wt.% graphite porosity of 10% . The concentration of PD is 10-5PD/g composite. (Sample 7).

P R I m e R 8. The catalyst is prepared analogously to example 1, but using geliographity composite, containing 1.2 wt.% graphite porosity of 30%. The PD concentration is 1.5 to 10-5g PD/g composite. (Sample 8).

P R I m e R 9. The catalyst is prepared analogously to example 1, but using the solution (C3H5dClPPh3) in toluene. The concentration of Pd is 10-5g PD/g composite. (Sample 9).

P R I m e R 10. The catalyst is prepared analogously to example 1, but using the solution (C3H6tCl)4in toluene. The concentration of PT is 10-5g PT/g composite. (Sample 10).

P R I m e R 11. The catalyst is prepared analogously to example 1, but using geliographity composite, containing 1.2 wt.% graphite porosity of 10%. The concentration of PD is 5 10-6PD/g composite. (Sample 11).

Thus prepared catalysts experience in CO oxidation. Re is the movement of which in the vertical position you can adjust the distance from the torch to the catalytic and substrate, therefore, the temperature of the latter. Flows of domestic gas and or model of gas fed to the nozzle, and the air in the case of domestic gas enters the combustion zone through a distribution ring. The flow velocity components of the reaction medium is controlled by using pre-calibrated rheometers. The CO concentration in the source and analyze the exhaust gas on the chromatograph.

The results are shown in the table.

1. The METHOD of preparation of the CATALYST of CO AFTERBURNING, including the stage of impregnation of the solid substrate compound of the platinum group metal, drying and calcination, wherein the solid substrate is used geliographity composite containing 0.5 - 3 wt.% graphite and having a pore volume of 10 to 30 vol.%, as compounds of the platinum group metal used-allyl compound of the metal of the platinum group, impregnation lead from the hydrocarbon solution of allyl compounds of the platinum group metal, the drying is carried out in air at room temperature and the firing is carried out at 750 - 850oC.

2. The method according to p. 1, characterized in that the as-allyl compounds of the platinum group metal is used as a compound from the group comprising (

 

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