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Ammoxidation catalyst for diesel engine exhaust gas purification system and preparation method thereof

A tail gas purification and ammonia oxidation technology, which is applied in the direction of physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problem of high selectivity, and achieve the effects of simple preparation method, reduced ammonia slip, and high N2 selectivity

Inactive Publication Date: 2017-06-30
WUXI WEIFU ENVIRONMENT PROTECTION CATALYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalyst also exists NO at high temperature x more selective questions

Method used

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  • Ammoxidation catalyst for diesel engine exhaust gas purification system and preparation method thereof
  • Ammoxidation catalyst for diesel engine exhaust gas purification system and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The catalyst is composed of a carrier and a coating. The coating is loaded with noble metal platinum. The coating amount is 120g / L, and the loading amount of noble metal platinum is 0.15g / L. The catalyst carrier is a cordierite ceramic carrier with a volume of 1.236L. The pore density is 400 mesh / square inch; the coating contains cerium-zirconium-aluminum composite oxide and β molecular sieve.

[0031] The ammonia oxidation catalyst used for diesel engine exhaust purification system comprises the following steps:

[0032] (1) Preparation of composite oxide cerium-zirconium-aluminum: first prepare the cerium-aluminum composite oxide according to the mass ratio of cerium oxide and alumina at 1:9, and then press the cerium-aluminum composite oxide Preparation of cerium-zirconium-aluminum composite oxide by impregnation method; prepare zirconyl nitrate solution according to the saturated adsorption capacity of cerium-aluminum composite oxide, impregnate, then stand for 12h,...

Embodiment 2

[0038]The specific preparation method and activity test are basically the same as in Example 1, except that titanyl sulfate is used instead of zirconyl nitrate to prepare the titanium-cerium-aluminum composite oxide. In the titanium-cerium-aluminum composite oxide, the mass ratio of titanium oxide to cerium-aluminum composite oxide is 1:7.

Embodiment 3

[0040] The specific preparation method and activity test are basically the same as in Example 1, except that the composite oxide is a cerium-silicon-aluminum composite oxide. The cerium-silicon-aluminum composite oxide is prepared by impregnating the silicon-aluminum composite oxide with a cerium nitrate solution. In the silicon-aluminum composite oxide, the mass ratio of silicon oxide to aluminum oxide is 1:19. In the cerium-silicon-aluminum composite oxide, the mass ratio of cerium oxide to silicon-aluminum composite oxide is 1:9.

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Abstract

The invention relates to an ammoxidation catalyst and a preparation method thereof, and belongs to the technical field of catalyst preparation. The catalyst comprises a carrier and a coating for coating the carrier. Precious metal platinum is loaded in the coating and the loading capacity of platinum is 0.01 to 1 g / L. The coating comprises composite oxides and molecular sieves. The composite oxides account for 60 to 99% of the quality of the coating. The molecular sieves account for 1 to 40% of the quality of the coating. The coated weight of the coating is 80 to 150 g / L. The preparation method is simple and the steps are easy to operate. The catalyst obtained through preparation is used for downstream usage of SCR method and is capable of effectively reducing the escape of ammonia.

Description

technical field [0001] The invention relates to an ammonia oxidation catalyst and a preparation method thereof, belonging to the technical field of catalyst preparation. Background technique [0002] Due to the high fuel economy and CO 2 The advantages of low emissions have made diesel vehicles more and more popular in most developed countries, especially in Europe. Pollutants emitted by diesel vehicles contain nitrogen oxides (NO x ), particulate matter (PM), and incompletely burned carbon monoxide (CO) and hydrocarbons (HC). NO x Nitric oxide (NO) and nitrogen dioxide (NO 2 ). As we all know, NO x It is one of the compounds that form photochemical smog and acid rain, causing a series of health and environmental problems. Therefore, the NO x Revert to N 2 And do not generate other toxic and harmful substances, in order to eliminate NO in motor vehicle exhaust x Adverse effects on humans and the environment. [0003] Selective catalytic reduction (SCR) is the use ...

Claims

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Application Information

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IPC IPC(8): B01J29/12B01J29/74B01D53/94B01D53/56
CPCB01J29/7415B01D53/9413B01D2258/01B01J29/126
Inventor 王秀庭孙亮季燕军张杰王刚岳军贾莉伟
Owner WUXI WEIFU ENVIRONMENT PROTECTION CATALYST
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