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Method for preparing toluene catalytic combustion monolithic catalysts and application

A monolithic catalyst, catalytic combustion technology, applied in the direction of catalyst activation/preparation, combustion method, physical/chemical process catalyst, etc., can solve the problems of increased catalyst preparation cost, unfavorable production application, unfavorable practical application, etc., to improve catalytic oxidation performance, reduced application costs, reduced peeling or peeling effects

Inactive Publication Date: 2016-06-22
NINGBO YUANXIANG ENERGY SAVING ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, on the one hand, due to the scarcity and high price of precious metals in storage, the use of too high a content of precious metals will inevitably lead to an increase in the cost of catalyst preparation, which is not conducive to production and application; on the other hand, a single cerium-based catalyst is active Poor, poor thermal stability and other disadvantages are not conducive to practical application; moreover, the existing coating technology has the disadvantages of uneven coating and poor firmness

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] CeO was prepared according to the above carrier preparation method 2 -Pr 6 o 11 / Al 2 o 3 Mixed oxide 200g, prepared into a mixed solution with a total cation concentration of 0.05mol / L, where Ce / Pr=1:9, stirred for 18min, and impregnated the prepared oxide with 0.5% (mass fraction) of precious metal according to the aforementioned method Pd, prepared as Pd-based catalysts, and then these catalysts were dried in a drying oven at 110°C for 6h, and finally calcined in a roaster at 500°C for 3h to obtain a catalyst for catalytic combustion of toluene waste gas.

[0052] The catalyst for the catalytic combustion of toluene exhaust gas was coated on the inner surface of the honeycomb cordierite according to the aforementioned coating method, with a load of 140g / L and a solid content of 50%, and then these coated samples were dried at 120°C for 6 hours , and finally baked in a muffle furnace at 500° C. for 2 hours to obtain the desired monolithic catalyst for catalytic co...

Embodiment 2

[0054] CeO was prepared according to the above carrier preparation method 2 -Pr 6 o 11 / Al 2 o 3 Mixed oxide 200g, prepared into a mixed solution with a total cation concentration of 0.05mol / L, where Ce / Pr=1:4, stirred for 20min, and impregnated the prepared oxide with 0.5% (mass fraction) of precious metal according to the aforementioned method Pd, prepared as Pd-based catalysts, and then these catalysts were dried in a drying oven at 110°C for 6h, and finally calcined in a roaster at 500°C for 3h to obtain a catalyst for catalytic combustion of toluene waste gas.

[0055] The catalyst for the catalytic combustion of toluene exhaust gas was coated on the inner surface of the honeycomb cordierite according to the aforementioned coating method, with a load of 140g / L and a solid content of 50%, and then these coated samples were dried at 120°C for 6 hours , and finally baked in a muffle furnace at 500° C. for 2 hours to obtain the desired monolithic catalyst for catalytic co...

Embodiment 3

[0057] CeO was prepared according to the above carrier preparation method 2 -Pr 6 o 11 / Al 2 o 3 Mixed oxide 200g, prepared into a mixed solution with a total cation concentration of 0.05mol / L, wherein Ce / Pr=4:1, stirred for 20min, and impregnated the prepared oxide with 0.5% (mass fraction) of precious metal according to the aforementioned method Pd, prepared as Pd-based catalysts, and then these catalysts were dried in a drying oven at 110°C for 6h, and finally calcined in a roaster at 500°C for 3h to obtain a catalyst for catalytic combustion of toluene waste gas.

[0058] The catalyst for the catalytic combustion of toluene exhaust gas was coated on the inner surface of the honeycomb cordierite according to the aforementioned coating method, with a load of 140g / L and a solid content of 50%, and then these coated samples were dried at 120°C for 6 hours , and finally baked in a muffle furnace at 500° C. for 2 hours to obtain the desired monolithic catalyst for catalytic ...

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Abstract

The invention provides a method for preparing toluene catalytic combustion monolithic catalysts and application. The toluene catalytic combustion monolithic catalysts are Pd-based catalysts, a carrier for the toluene catalytic combustion monolithic catalysts is CeO2-Pr6O11 / Al2O3, CeO2-Pr6O11 mixed oxide with different Ce / Pr molar ratios is researched, accordingly, the optimal Ce / Pr proportions of the CeO2-Pr6O11 mixed oxide with the highest activity are found, and the toluene catalytic combustion monolithic catalysts are optimal in toluene catalytic oxidation activity when the Ce / Pr proportions are equal to 4:1. The method and the application have the advantages of excellent catalytic performance, low precious-metal content, good thermal stability and uniform coating.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to a Pd / CeO containing low noble metal 2 -Pr 6 o 11 / Al 2 o 3 The preparation, coating method and application of the catalyst in the toluene catalytic combustion monolithic catalyst belong to the field of catalytic research and application. Background technique [0002] In recent years, due to the development of petrochemical, pharmaceutical, painting, coating and other industries, a large number of volatile organic pollutants (VOCs) have been discharged into the atmosphere, which have caused serious damage to the ecological environment and human health. Impact. Toluene is a type of VOCs, mainly from petrochemical, painting and coating industries. At present, the catalytic combustion method is one of the most effective methods to completely eliminate pollutants such as VOCs, especially for low-concentration VOCs emissions, and the use cost is low. Most of the catalysts used in indust...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63B01J37/02F23G7/07
CPCB01J23/63B01J23/002B01J37/0219B01J37/0228B01J2523/00F23G7/07B01J2523/3712B01J2523/3718B01J2523/31
Inventor 张海龙
Owner NINGBO YUANXIANG ENERGY SAVING ENVIRONMENTAL PROTECTION TECH CO LTD
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