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Catalyst for diesel engine on basis of composite main catalyst and hydrotalcite-derived oxide and preparation method thereof

A composite oxide, main catalyst technology, used in chemical instruments and methods, molecular sieve catalysts, physical/chemical process catalysts, etc.

Active Publication Date: 2019-04-09
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the defects of existing commercial LNT catalysts in aspects such as main catalyst, adsorbent and coating base material, the present invention introduces La x Ce (1-x) mn y Fe (1-y) o 3 Based on new materials such as type perovskite composite oxide, transition metal chromium modified ZSM-5 molecular sieve and metal modified hydrotalcite-derived oxide, a catalyst for diesel engine based on composite main catalyst and hydrotalcite-derived oxide and its Preparation

Method used

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  • Catalyst for diesel engine on basis of composite main catalyst and hydrotalcite-derived oxide and preparation method thereof
  • Catalyst for diesel engine on basis of composite main catalyst and hydrotalcite-derived oxide and preparation method thereof
  • Catalyst for diesel engine on basis of composite main catalyst and hydrotalcite-derived oxide and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Determination of the amount of catalyst raw material used

[0041] La in the main catalyst of the prepared catalyst of Design Example 1 x Ce (1-x) mn y Fe (1-y) o 3 The mass ratio of type perovskite composite oxide and Cr modified ZSM-5 molecular sieve is: 75%:25%; La x Ce (1-x) mn y Fe (1-y) o 3 In the type perovskite composite oxide, the molar percentage of La ion and Ce ion at A site is: 25% / 75%, and the molar percentage of Mn ion and Fe ion at B site is: 50% / 50%; Cr modified ZSM -5 molecular sieve, Cr 2 o 3 The mass percentage of the ZSM-5 molecular sieve is: 15% / 85%; the mass ratio of the main catalyst, co-catalyst and coating base material is: 15%: 20%: 65%; CeO in the co-catalyst 2 and ZrO 2 The mass ratio is: 60%:40%; Ni-modified hydrotalcite derived composite oxide and γ-Al in the coating base material 2 o 3 The mass ratio of MgO and NiO is: 80%: 20%; The mass ratio of MgO and NiO in the Ni modified hydrotalcite derived composite oxide is: 15%...

Embodiment 2

[0054] (1) Determination of the amount of catalyst raw material used

[0055] La in the main catalyst of the prepared catalyst of design embodiment 2 x Ce (1-x) mn y Fe (1-y) o 3 The mass ratio of type perovskite composite oxide and Cr modified ZSM-5 molecular sieve is: 50%:50%; La x Ce (1-x) mn y Fe (1-y) o 3 In the type perovskite composite oxide, the molar percentage of La ion and Ce ion at A site is: 75% / 25%, and the molar percentage of Mn ion and Fe ion at B site is: 25% / 75%; Cr modified ZSM -5 molecular sieve, Cr 2 o 3 The mass percentage of ZSM-5 molecular sieve is: 5% / 95%; the mass ratio of main catalyst, co-catalyst and coating base material is: 8%: 10%: 82%; CeO in co-catalyst 2 and ZrO 2 The mass ratio is: 80%:20%; Ni-modified hydrotalcite-derived composite oxide and γ-Al in the coating base material 2 o 3 The mass ratio of MgO and NiO is: 90%: 10%; The mass ratio of MgO and NiO in the Ni modified hydrotalcite derived composite oxide is: 35%: 65%; Every ...

Embodiment 3

[0068] (1) Determination of the amount of catalyst raw material used

[0069] La in the main catalyst of the prepared catalyst of design embodiment 3 x Ce (1-x) mn y Fe (1-y) o 3 The mass ratio of type perovskite composite oxide and Cr modified ZSM-5 molecular sieve is: 50%:50%; La x Ce (1-x) mn y Fe (1-y) o 3 In the type perovskite composite oxide, the molar percentage of La ion and Ce ion at A site is: 50% / 50%, and the molar percentage of Mn ion and Fe ion at B site is: 50% / 50%; Cr modified ZSM -5 molecular sieve, Cr 2 o 3 The mass percentage of the ZSM-5 molecular sieve is: 10% / 90%; the mass ratio of the main catalyst, co-catalyst and coating base material is: 15%:15%:70%; CeO in the co-catalyst 2 and ZrO 2 The mass ratio is: 80%:20%; Ni-modified hydrotalcite-derived composite oxide and γ-Al in the coating base material 2 o 3 The mass ratio of MgO and NiO is: 90%: 10%; The mass ratio of MgO and NiO in the Ni modified hydrotalcite derived composite oxide is: 35...

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Abstract

The invention discloses a catalyst for a diesel engine on the basis of a composite main catalyst and a hydrotalcite-derived oxide, wherein a perovskite composite oxide and a modified molecular sieve are adopted as main catalysts, CeO2-ZrO2 is adopted as a cocatalyst, a modified hydrotalcite-derived oxide and gamma-Al2O3 are adopted as basic materials of a coating, and cordierite honeycomb ceramicis adopted as a carrier. A preparation process comprises the following steps of: determination of the use amount of raw materials; preparation of the perovskite composite oxide, the modified molecularsieve and the modified hydrotalcite-derived oxide, and preparation and coating of coating slurry. The catalyst and the preparation process disclosed by the invention have the beneficial effects thatby cyclic change of lean / rich condition of the diesel engine, the catalyst can catalyze adsorbing-reducing purifying reaction of NOx in exhaust by high efficiency; the composite main catalyst replacesthe noble-metal main catalyst of the traditional LNT (Lean NOx Trap) catalyst, so that the cost of raw materials is reduced, and the sulfur resistance and the heat stability are improved; the modified hydrotalcite-derived oxide replaces Al2O3 and BaO in the traditional LNT catalyst, so that the NOx adsorbing capability of the catalyst is obviously improved.

Description

technical field [0001] The invention belongs to the purification technology of diesel engine tail gas pollutants, in particular to an adsorption-reduction catalyst used for purifying nitrogen oxides (Nitrogen Oxides—NOx) pollutants in diesel engine tail gas and a preparation method thereof. Background technique [0002] In recent years, the production and ownership of motor vehicles in my country have continued to grow rapidly. While bringing great convenience to economic development and residents' lives, it has also led to increasingly prominent air pollution problems in our country. Among them, the contribution of motor vehicles to NOx pollutants in my country's atmosphere is particularly obvious. For example, the total emission of NOx in my country reached 23.378 million tons in 2012, and NOx emitted by motor vehicles accounted for about 30% of it. In urban areas, due to the lack of industrial pollution sources, coal and gas pollution sources have completed sewage renovat...

Claims

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Application Information

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IPC IPC(8): B01J29/48B01J20/12B01D53/94B01D53/56
CPCB01D53/9418B01D2258/012B01J20/041B01J20/08B01J20/12B01J29/48
Inventor 吕刚朱越宋崇林
Owner TIANJIN UNIV
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