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Automobile ternary catalytic converter

A technology of catalytic converters and catalytic converters, which is applied in the direction of catalyst activation/preparation, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of low NOx conversion efficiency, difficult NOx, high emission, and reduce the probability of active agent failure , Improve high temperature aging resistance and improve conversion efficiency

Inactive Publication Date: 2018-03-13
CHONGQING BRILLIANT TIGER CATALYTIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the NOx conversion of existing vehicles is relatively difficult, and the emission is high. The current three-way catalytic converter cannot effectively convert NOx, and the NOx conversion efficiency is low, which cannot meet the high emission standards required by the state.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Adopt the following method to prepare automobile three-way catalytic converter:

[0023] 1) 57g cerium-zirconium composite oxide, 57g modified Al 2 o 3 1. Mix 29g Beta molecular sieve and 120g deionized water, add 2.2963g Pd, stir for 3h; add binder, continue stirring for 1h, add water ball mill for 10min, form Pd catalyst slurry after adjusting the solid content;

[0024] 2) Coating the Pd catalyst slurry in step 1) at 100 g / L on a honeycomb ceramic carrier, drying at 120° C. for 5 hours, and firing at 500° C. for 3 hours to obtain a Pd layer catalyst;

[0025] 3) 45.6g cerium-zirconium composite oxide, 45.6g modified Al 2 o 3 1. Mix 29g Beta molecular sieve with 100g deionized water, add 0.1209g Rh, stir for 3h; add binder, continue stirring for 1h, add water ball mill to form Rh catalyst slurry after adjusting the solid content;

[0026] 4) Coat the Rh catalyst slurry in step 3) at 80g / L on the Pd layer catalyst in step 2), dry at 120°C for 5h, and bake at 500°C ...

Embodiment 2

[0028] Adopt the following method to prepare automobile three-way catalytic converter:

[0029] 1) 54.8g cerium-zirconium composite oxide, 82.1g modified Al 2 o 3 , 5.5g Beta molecular sieve and 150g deionized water are mixed, add 2.2963gPd, stir 5h; Add binding agent, continue to stir 0.5h, add water ball mill to form Pd catalyst slurry after adjusting solid content;

[0030] 2) Coating the Pd catalyst slurry in step 1) at 120g / L on the honeycomb ceramic carrier, drying at 120°C for 10h, and calcining at 600°C for 5 hours to obtain a Pd layer catalyst;

[0031] 3) 85.6g cerium-zirconium composite oxide, 28.5g modified Al 2 o 3 , 28.5g Beta molecular sieve and 120g deionized water are mixed, add 0.1209g Rh, stir 1h; Add binding agent, continue to stir 3h, add water ball mill to form Rh catalyst slurry after adjusting solid content;

[0032] 4) Coat the Rh catalyst slurry in step 3) at 100g / L on the Pd layer catalyst in step 2), dry at 120°C for 10h, and bake at 600°C for 1...

Embodiment 3

[0034] Adopt the following method to prepare automobile three-way catalytic converter:

[0035] 1) 28.5g cerium-zirconium composite oxide, 85.5g modified Al 2 o 3 , 28.5g Beta molecular sieve and 120g deionized water are mixed, add 2.2963g Pd, stir 3h; Add binding agent, continue to stir 3h, add water ball mill to form Pd catalyst slurry after adjusting solid content;

[0036] 2) Coating the Pd catalyst slurry in step 1) at 150g / L on the honeycomb ceramic carrier, drying at 120°C for 10h, and roasting at 600°C for 1 hour to obtain a Pd layer catalyst;

[0037] 3) 28.5g cerium-zirconium composite oxide, 85.6g modified Al 2 o 3 , 28.5g Beta molecular sieve and 120g deionized water are mixed, add 0.1209g Rh, stir 1h; Add binding agent, continue to stir 3h, add water ball mill to form Rh catalyst slurry after adjusting solid content;

[0038] 4) Coat the Rh catalyst slurry in step 3) at 120g / L on the Pd layer catalyst in step 2), dry at 120°C for 3h, and bake at 600°C for 5 ho...

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Abstract

The invention discloses an automobile ternary catalytic converter. The automobile ternary catalytic converter comprises a honeycomb ceramic carrier, and a catalyst used for coating the honeycomb ceramic carrier. The automobile ternary catalytic converter is of a double-layer structure; the internal layer is a Pd layer catalyst converter, the external layer is a Rh catalytic layer used for coatingthe Pd layer catalyst converter; the Pd layer catalyst converter is composed of the honeycomb ceramic carrier and a Pd catalyst layer used for coating the honeycomb ceramic carrier; the Pd catalyst layer is prepared via mixing of a ceria-zirconia composite oxide, modified Al2O3, a molecular sieve, and precious metal Pd; the Rh catalyst layer is prepared via mixing of the ceria-zirconia composite oxide, modified Al2O3, a molecular sieve, and precious metal Rh. The double-layer structure is adopted by the automobile ternary catalysis converter, so that the high temperature and aging resistance of the automobile ternary catalysis converter are improved, the probability of activator failure caused by alloy formed among metal is reduced, the Rh layer on the external surface is beneficial for preferential adsorption conversion of NOx, increasing of NOx conversion efficiency, and reducing NOx discharge.

Description

technical field [0001] The invention belongs to the field of automobile tail gas treatment, in particular to an automobile three-way catalytic converter. Background technique [0002] Automobile exhaust contains many harmful substances, mainly including hydrocarbons and nitrogen oxides. Reducing the emission of harmful substances in automobile exhaust is an important issue that human beings must solve. At present, the most effective way to control automobile exhaust pollution is to use a conversion device to convert harmful components into harmless gases. The most commonly used converter is a three-way converter. The three-way converter is the most important external purification device installed in the automobile exhaust system, which can convert harmful gases such as CO, HC and NOx emitted from automobile exhaust into harmless carbon dioxide, water and nitrogen through oxidation and reduction , so that the car exhaust can be purified. [0003] The catalyst coating of aut...

Claims

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Application Information

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IPC IPC(8): B01J23/46B01J29/74B01J35/00B01J37/02F01N3/28B01D53/94B01D53/56
CPCB01D53/945F01N3/28B01J23/464B01J29/7415B01J37/0205B01J37/0207B01J35/396Y02A50/20Y02T10/12
Inventor 李俊强谭涛杨艳芳唐春荣
Owner CHONGQING BRILLIANT TIGER CATALYTIC
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