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Monolithic Pd catalyst for purifying industrial organic waste gas and preparation method thereof

An organic waste gas and catalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., to prevent surface carbon, improve combustion resistance, and improve thermal stability Effect

Inactive Publication Date: 2013-08-14
ZHEJIANG NORMAL UNIVERSITY +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a monolithic Pd catalyst with good combustion resistance and thermal stability for catalytic purification of industrial organic waste gas and its preparation method in view of the shortcomings in the preparation process of existing industrial organic waste gas catalysts

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0015] (1) The first coating: weigh 58 g of cerium-zirconium solid solution, La 2 o 3 2 g, Nb(OH) 5 2.67g (by Nb 2 o 5 Calculation 2g), pseudo-boehmite binder 63.3 g (according to alumina calculation 38 g) (mass ratio is 58%: 2%: 2%: 38%), add 500 ml of deionized water to dilute and ball mill for 4 hours , adjust the acidity to pH=2.5 with concentrated nitric acid. The cordierite honeycomb ceramic carrier (200 mesh, shape 100mm*100mm*40mm) was impregnated with the above slurry, and the excess slurry in the pores of the honeycomb ceramic carrier was blown out with high-pressure gas. Then through 110 DEG C of drying, 500 DEG C of baking 4 hours. The application amount of the first coat was 20 g / L.

[0016] (2) Second coating: weigh 40 g of cerium-zirconium solid solution, La 2 o 3 3 g, 87.5 g of pseudo-boehmite binder (52.5 g calculated as alumina), 3 g of absolute ethanol and H 2 PdCl 6 10 g of the solution (containing 1.5 g of Pd) (mass ratio 40% : 3% : 52.5% : 3...

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Abstract

The invention relates to a monolithic Pd catalyst for catalytic purification of industrial organic waste gas and a preparation method thereof. The catalyst comprises a cerium-zirconium solid solution, La2O3, Nb2O5, Al2O3, noble metal Pd and a cordierite-honeycomb ceramic supporter. The preparation method comprises the following step: coating the cerium-zirconium solid solution, La2O3, Nb2O5, a pseudo-boehmite binding agent and the noble metal Pd on the surface of the cordierite-honeycomb ceramic supporter in twice, wherein the total mass of the cerium-zirconium solid solution, La2O3, Nb2O5 and Al2O3 coated for each liter of catalyst is 40g; and the loading amount of Pd contained in each liter of catalyst is 0.3g. The catalyst can prevent surface carbon deposition, and has satisfactory burning resistance and heat stability.

Description

technical field [0001] The invention relates to a chemical catalyst, in particular to an integral Pd catalyst for catalytic purification of industrial organic waste gas and a preparation method thereof. Background technique [0002] Toluene, xylene, styrene, ethyl acetate, acetone and other volatile organic compounds (VOCs) are released in the production process of petrochemical, paint, metal product coating, printing, pharmaceutical, leather, textile printing and dyeing industries. Volatile organic compounds are one of the main harmful substances that cause air pollution, and are also the main source of photochemical pollution and the formation of fine particulate matter (PM2.5), which can cause abnormalities in the human central nervous system, respiratory system, immune system, reproductive system, etc. ( J.J.Spivey, Ind. Eng. Chem Res 1987, 26:2165-2180), can cause acute and chronic poisoning, carcinogenicity and gene mutation. [0003] Catalytic combustion is one of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/44B01D53/86
Inventor 罗孟飞周仁美章轩语金凌云
Owner ZHEJIANG NORMAL UNIVERSITY
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