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Catalyst for purification of automobile exhaust gas, coating material, preparation method and application thereof

A catalyst coating, automobile exhaust technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the problem of high cost of coating manufacturing and achieve manufacturing costs Low, high catalytic conversion efficiency, large loading effect

Active Publication Date: 2018-01-02
苏磊
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the problem of high manufacturing cost of the existing precious metal catalyst coating, and provides a low-cost, high-efficiency automobile exhaust purification catalyst and its coating material based entirely on base metal elements such as rare earth metals and transition metals

Method used

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  • Catalyst for purification of automobile exhaust gas, coating material, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The coating material (catalyst) that is used for automobile exhaust purification is prepared according to the following steps:

[0032] (1) Preparation of oxygen storage layer material: Weigh 20g of cerium nitrate hexahydrate and 20g of lanthanum nitrate hexahydrate respectively in a beaker, dissolve it with 500ml of deionized water, stir evenly with a glass rod, and add 10ml of ethyl nitrate to it successively. Glycol and 15g citric acid, ultrasonically oscillate until a sol is formed; then weigh 60g of kaolin, pour it into the above sol, stir it evenly with a glass rod, put it in an oven for drying at 80°C, and place the obtained product in a crucible, 500 Calcined at ℃ for 2 hours to obtain the oxygen storage layer material;

[0033] (2) Preparation of catalytically active layer material: Weigh 26g of cobalt nitrate hexahydrate and place it in a beaker, dissolve it with 500ml of deionized water, stir evenly with a glass rod, add 10ml of ethylene glycol and 15g of cit...

Embodiment 2

[0036] The coating material (catalyst) that is used for automobile exhaust purification is prepared according to the following steps:

[0037] (1) Preparation of oxygen storage layer material: Weigh 40 g of cerium nitrate hexahydrate and place it in a beaker, dissolve it with 500 ml of deionized water, stir it evenly with a glass rod, add 6 ml of ethylene glycol and 17 g of citric acid successively, and ultrasonically Shake until a sol is formed; then weigh 30g of kaolin, pour it into the above sol, stir it evenly with a glass rod, put it in an oven to dry at 80°C, put the obtained product in a crucible, and calcinate at 400°C for 3 hours to obtain Oxygen storage layer material;

[0038] (2) Preparation of catalytically active layer material: take by weighing manganese nitrate tetrahydrate 11.25g and place it in a beaker, dissolve it with 500ml deionized water, after the glass rod is stirred evenly, add 5ml ethylene glycol and 8g citric acid therein successively, Ultrasonic v...

Embodiment 3

[0041] A catalyst coating material for automobile exhaust purification, consisting of an oxygen storage layer at the lower layer and a catalytically active layer at the upper layer; the oxygen storage layer is made of CeO 2 and La 2 o 3 Uniformly supported on kaolin, CeO 2 and La 2 o 3 The mass ratio of the sum of the two to kaolin is 2:1; the catalytically active layer is made of Co 2 o 3 Uniformly supported on kaolin, the Co 2 o 3 The mass ratio to kaolin is 1:1; the thickness ratio of the oxygen storage layer to the catalytic active layer is 1:1.

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Abstract

The invention discloses a catalyst coating material for purifying automobile exhaust gas. The catalyst coating material comprises an oxygen storage layer on the lower layer and a catalytic active layer on the upper layer; the oxygen storage layer is made of rare earth metal or transition metal One or more oxides are uniformly loaded on porous mineral particles; the catalytic active layer is formed by one or more transition metal oxides uniformly loaded on porous mineral particles. The invention further discloses a preparation method of the coating material and a catalyst prepared by using the coating material. The catalyst coating material disclosed by the invention is entirely composed of rare earth and transition metal oxides, does not contain noble metal elements at all, has low manufacturing cost, and has a large loading capacity of metal elements, many catalytic sites, and the upper and lower layers have a good synergistic catalytic effect , high catalytic conversion efficiency, good application prospects.

Description

technical field [0001] The invention relates to the technical field of automobile exhaust catalysts, in particular to a catalyst used for automobile exhaust purification and a coating material thereof. Background technique [0002] Automobile exhaust pollution mainly refers to the pollution and damage to the environment and human body caused by some harmful substances discharged from diesel, gasoline and other motor vehicle fuels containing additives and impurities during incomplete combustion. These harmful substances can be divided into two categories: gas and particulate matter. Gases mainly include carbon monoxide (CO), nitrogen oxides (NO x ) and hydrocarbons (HC), etc., have become the main sources of urban air pollution. Installing off-board automotive exhaust catalytic converters is an internationally recognized method for reducing CO and NO in automotive exhaust. x The most effective measures for toxic and harmful components such as HC and HC, the core of which i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/83B01J23/34B01J35/10B01D53/94B01D53/56B01D53/62B01D53/72
Inventor 苏磊王永强宁好敏杨坤袁朝圣
Owner 苏磊
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