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Double layer noble metal active component catalyst and preparing method thereof

A catalyst and precious metal technology, applied in the field of double-layer precious metal active component catalyst and its preparation, can solve the problems of poor anti-poisoning ability, reduced catalytic activity, etc. Effect

Inactive Publication Date: 2008-07-23
北京英泰世纪环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the three noble metals, the Pd catalyst has good activity for the oxidation of HC, and its high temperature resistance is also stronger, which is better than that of Pt and Rh, but its anti-poisoning ability is poor, especially for SO 2 Sensitive to lead Pb poisoning
The noble metal rhodium Rh has a high reduction activity to nitrogen oxides NOx, but it is easy to form an alloy with Pd at high temperature, which greatly reduces its catalytic activity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The double-layer precious metal active component catalyst of the present embodiment is made by following steps:

[0040] (1) Weigh 40kg of activated alumina, 7kg of cerium-zirconium solid solution, 1kg of nitric acid and 52kg of deionized water, put them into a ball mill jar and mill for 5 hours to make alumina slurry C0.

[0041] (2) Immerse the cleaned and oxidized metal honeycomb carrier (35×100×100 metal carrier) in the above slurry for 10 seconds, and blow off the residual slurry with 0.4MPa compressed air after taking it out to control the metal loading to 50g / ft 3 , put it into a mesh-belt continuous drying kiln and dry it at 105°C for 3h; roast it in a roasting kiln at 500°C for 1h to make a semi-finished product G0.

[0042] (3) Get the palladium nitrate solution P0 with a concentration of 25%, immerse the above-mentioned catalyst semi-finished product in it for 5 minutes, take it out, and blow off the raffinate with 0.25MPa compressed air. Roast at 500°C f...

Embodiment 2

[0056] The double-layer precious metal active component catalyst of the present embodiment is made by following steps:

[0057] (1) Weigh 50 kg of activated alumina, 5 kg of cerium-zirconium solid solution, 0.5 kg of nitric acid and 44.5 kg of deionized water, put them into a ball mill jar and mill for 3 hours to make alumina slurry C0.

[0058] (2) Soak the cleaned and dried ceramic honeycomb carrier (35×100×100 ceramic carrier) in the above slurry for 15s, and blow off the residual slurry with 0.45MPa compressed air after taking it out, and control the metal loading to 50g / ft 3 , put it into the mesh belt type continuous drying kiln and dry it at 80°C for 2h; roast it at 600°C for 3h in the roasting kiln to make the semi-finished product G0.

[0059] (3) Take the palladium acetate solution P0 with a concentration of 30%, immerse the semi-finished catalyst product in it for 20 minutes, take it out, and blow off the raffinate with 0.15MPa compressed air. Roast at 300°C for...

Embodiment 3

[0063] The double-layer precious metal active component catalyst of the present embodiment is made by following steps:

[0064] (1) Weigh 20kg of activated alumina, 10kg of cerium-zirconium solid solution, 0.3kg of nitric acid and 69.7kg of deionized water, put them into a ball mill jar and mill for 12 hours to make alumina slurry C0.

[0065] (2) Soak the cleaned and oxidized metal honeycomb carrier (35×100×100 metal carrier) in the above slurry for 3 seconds, blow off the residual slurry with 0.25MPa compressed air after taking it out, and control the metal loading to 50g / ft 3 , put it into a mesh-belt continuous drying kiln for 1 hour at 120°C; roast it in a roasting kiln for 4 hours at 750°C to make a semi-finished product G0.

[0066] (3) Take the palladium nitrate solution P0 with a concentration of 20%, immerse the semi-finished catalyst product in it for 25 minutes, take it out, and blow off the raffinate with 0.20MPa compressed air. Roast at 450°C for 1 hrs in a r...

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Abstract

The invention provides a dual-layer noble metal active component catalyst, wherein the active component is distributed in lamination, and a dual-layer coating method is adopted to separate the active components of noble metal and lead the active components to stay on different layers to play individual functions fully. Not only the resistance to aging at high temperature of catalyst can be satisfied but also the catalytic reduction ability of nitrogen oxide under lean-burn condition can be improved and the ignition temperature of the catalyst can be reduced, thus greatly improving the utilization of active component.

Description

technical field [0001] The invention relates to a noble metal catalyst, in particular to a double-layer noble metal active component catalyst and a preparation method thereof. The catalyst contains a first coating of a noble metal active component and a second coating of a noble metal active component. Background technique [0002] Three-way catalyst refers to the ability to convert CO, HC and NOx in motor vehicle exhaust gas into pollution-free water vapor H through catalytic oxidation reaction and catalytic reduction reaction. 2 O, Nitrogen N 2 and carbon dioxide CO 2 Wait. With the further tightening of emission regulations, more stringent requirements are put forward for the three-way catalyst. In order to reduce the pollutant emission of the engine during the cold start stage, the catalyst is required to be installed closer to the engine exhaust port, and the catalyst needs to be better. high temperature resistance; in order to improve the fuel economy of the engine,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63B01J23/40B01J37/02
Inventor 潘陆陆刘耀军王大祥
Owner 北京英泰世纪环境科技有限公司
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