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Pd-Rh double-coating catalyst and preparation method thereof

A catalyst and double-coating technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve problems such as catalyst failure and achieve excellent catalytic performance.

Active Publication Date: 2019-05-24
SINOCAT ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the defect that Pd and Rh form palladium-rhodium alloy at high temperature and cause catalyst failure when they are in the same layer of catalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The first step: preparation of bottom layer Pd-Rh coating (Pd content 50g / ft 3 , Rh content 5g / ft 3 )

[0036] Weigh palladium nitrate solution (containing Pd: 8g), add 200g of deionized water, add barium nitrate (containing Ba: 8g), after stirring evenly, add 16g of tartaric acid under stirring, heat and stir in a water bath at 60°C for 20min and set aside. Weigh the Rh nitrate solution (containing Rh: 0.8g), add 200g of deionized solution and stir evenly, then add 0.8g of polyethylene glycol under stirring, heat and stir in a water bath at 60°C for 20min and set aside. Mix the above-mentioned treated Pd solution and Rh solution evenly. 300g La-Al 2 o 3 Add the powder and 190g of oxygen storage material (cerium-zirconium-lanthanum-praseodymium composite oxide) into the uniformly stirred Pd-Rh mixed solution, stir quickly and uniformly, and then stand for 1 hour. Then, it was dried at 100°C for 5 hours and calcined at 550°C for 2 hours to obtain Pd-Rh noble metal p...

Embodiment 2

[0040] The first step: preparation of bottom layer Pd-Rh coating (Pd content 30g / ft 3 , Rh content 2g / ft 3 )

[0041] Weigh palladium nitrate solution (containing Pd: 5g), add 200g of deionized water, add barium nitrate (containing Ba: 5g), after stirring evenly, add 20g of tartaric acid under stirring, heat and stir in a 60°C water bath for 20min and set aside. Weigh the Rh nitrate solution (containing Rh: 0.3333g), add 200g of deionized solution and stir evenly, then add 0.5g of polyethylene glycol under stirring, heat and stir in a water bath at 60°C for 20min and set aside. Mix the above-mentioned treated Pd solution and Rh solution evenly. 300g La-Al 2 o 3 Add the powder and 190g of oxygen storage material (cerium-zirconium-lanthanum-praseodymium composite oxide) into the uniformly stirred Pd-Rh mixed solution, stir quickly and uniformly, and then stand for 1 hour. Then, it was dried at 100°C for 5 hours and calcined at 550°C for 2 hours to obtain Pd-Rh noble metal p...

Embodiment 3

[0045] The first step: preparation of bottom layer Pd-Rh coating (Pd content 59.4g / ft 3 , Rh content 1g / ft 3 )

[0046] Weigh palladium nitrate solution (containing Pd: 9.9g), add 200g of deionized water, add barium nitrate (containing Sr: 9g), after stirring evenly, add 20g of tartaric acid under stirring, heat and stir in a water bath at 60°C for 20min for later use . Weigh the Rh nitrate solution (containing Rh: 0.1667g), add 200g of deionized solution and stir evenly, then add 0.4g of polyethylene glycol under stirring, heat and stir in a water bath at 60°C for 20 minutes and set aside. Mix the above-mentioned treated Pd solution and Rh solution evenly. 300g La-Al 2 o 3 Add the powder and 190g of oxygen storage material (cerium-zirconium-lanthanum-praseodymium composite oxide) into the uniformly stirred Pd-Rh mixed solution, stir quickly and uniformly, and then stand for 1 hour. Then, it was dried at 100°C for 5 hours and calcined at 550°C for 2 hours to obtain Pd-Rh...

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PUM

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Abstract

The invention discloses a Pd-Rh double-coating catalyst and a preparation method thereof. The catalyst is a double-coating catalyst. Pd and Rh are supported on a same coating material at the same time, and the Pd and Rh synergistic effect is reflected. Before supporting, a Pd precursor solution and a Rh precursor solution are dispersed by using different dispersing agents respectively, and the situation that Pd and Rh make direct contact to form alloy at a high temperature can be effectively prevented. On a catalyst coating structure, the Pd is mainly arranged on the bottom layer by adding a little amount of Rh, and due to the synergistic effect, the performance of the Pd is enhanced; Rh is mainly arranged on the upper layer by adding a little amount of Pd, due to the synergistic effect, the performance of the Rh is enhanced. The catalyst prepared by using the method is used for processing automobile exhaust, and the catalyst is excellent in catalytic performance.

Description

technical field [0001] The invention belongs to the technical field of catalysts and their preparation, in particular to the technical field of automobile exhaust purification catalysts and their preparations, in particular to a noble metal catalyst and its preparation method. Background technique [0002] With the increase of car ownership year by year, car exhaust emissions have become the main source of air pollution. The main pollutants of automobile exhaust are carbon monoxide (CO), hydrocarbons (HC) and nitrogen oxides (NOx). The three-way catalyst installed in the exhaust system of automobiles can effectively convert carbon monoxide, hydrocarbons, and nitrogen oxides in automobile exhaust into carbon dioxide (CO 2 ), water (H 2 O) and nitrogen (N 2 ). [0003] Three-way catalysts usually consist of two parts: a honeycomb ceramic or metal substrate, and a catalyst coating attached to the honeycomb substrate. Catalyst coatings are usually made of inorganic oxide ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63B01D53/94B01D53/56B01D53/72B01D53/62
Inventor 李大成陈山虎兰丽王金凤杨兰王云李云陈启章陈耀强
Owner SINOCAT ENVIRONMENTAL TECH
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