Catalyst based on modified molecular sieve and hydrotalcite derived oxides and applied to diesel engine, preparation and application

A molecular sieve and catalyst technology, applied in the field of adsorption-reduction catalyst and its preparation, can solve the problems of poor adsorption effect, poor stability of catalytic coating, difficulty in improving the adsorption performance of LNT catalyst, etc.

Active Publication Date: 2017-04-26
TIANJIN UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

However, the adsorption effect of BaO adsorbent in low temperature (<300°C) exhaust gas is poor, and it is easy to volatilize when the load is large, resulting in poor stability of the catalytic coating
At the same time, although γ-Al 2 o 3 It is a coating base material with high stability and specific surface area, but its own NOx adsorption performance is poor, and it is difficult to cooperate with adsorbent and other components to improve the adsorption performance of LNT catalyst
In addition, precious metals such as Pt and Pd are expensive, have poor sulfur resistance, and are easy to sinter at high temperatures. Their performance characteristics are difficult to meet the special requirements of low cost and high performance for LNT catalysts for diesel engines in my country.

Method used

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  • Catalyst based on modified molecular sieve and hydrotalcite derived oxides and applied to diesel engine, preparation and application
  • Catalyst based on modified molecular sieve and hydrotalcite derived oxides and applied to diesel engine, preparation and application
  • Catalyst based on modified molecular sieve and hydrotalcite derived oxides and applied to diesel engine, preparation and application

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preparation example Construction

[0044] The preparation method of the catalyst for diesel engine based on modified molecular sieve and hydrotalcite derivative oxide, its concrete process comprises following 5 steps:

[0045] (1) Determination of the catalyst raw material consumption;

[0046] (2) Preparation of Co-modified ZSM-5 molecular sieve main catalyst

[0047] (3) Preparation of multiple metal modified hydrotalcite derived composite oxides;

[0048] (4) Preparation of coating slurry;

[0049] (5) Coating of coating slurry.

[0050] Preparation method of catalyst for diesel engine based on modified molecular sieve and hydrotalcite-derived oxide, including multiple metal modified hydrotalcite-derived composite oxide, Co modified ZSM-5 molecular sieve, CeO 2 -ZrO 2 Solid solution, γ-Al 2 o 3 And 400 mesh cordierite honeycomb ceramics, etc.

[0051] The main catalyst of the catalyst of the present invention is composed of Co modified ZSM-5 molecular sieves, wherein the Co element is represented by C...

Embodiment 1

[0060] (1) Determination of the amount of catalyst raw material used

[0061] Co in the main catalyst of the catalyst prepared in Design Example 1 3 o 4 The mass ratio of the ZSM-5 molecular sieve is: 5%:95%; the mass ratio of the main catalyst, co-catalyst and coating base material is: 8%:20%:72%; CeO in the co-catalyst 2 and ZrO 2 The mass ratio is: 60%:40%; multi-element metal modified hydrotalcite derived composite oxide and γ-Al in the coating base material 2 o 3 The mass ratio of MgO and CuO is: 11%:89%, Al 2 o 3 and Fe 2 o 3 The mass ratio is: 0%:100%; pure γ-Al in the coating base material 2 o 3 Convert with aluminum sol to generate γ-Al 2 o 3 The mass ratio is: 40%:60%; every 100g of catalytic coating requires 15g of polyethylene glycol with an average molecular weight of 20,000 and 50g of nitric acid; the preparation of every 100g of Co modified ZSM-5 molecular sieve requires 200ml of n-hexane. According to the conversion ratio, calculate the required raw...

Embodiment 2

[0072] (1) Determination of the amount of catalyst raw material used

[0073] Co in the main catalyst of the catalyst prepared in Design Example 2 3 o 4 The mass ratio of the ZSM-5 molecular sieve is: 15%: 85%; the mass ratio of the main catalyst, co-catalyst and coating base material is: 4%: 10%: 86%; CeO in the co-catalyst 2 , ZrO 2 The mass ratio is: 80%:20%; multi-element metal modified hydrotalcite derived composite oxide and γ-Al in the coating base material 2 o 3 The mass ratio of MgO and CuO is: 34%: 66%, Al 2 o 3 and Fe 2 o 3 The mass ratio is: 39%:61%; pure γ-Al in the coating base material 2 o 3 Convert with aluminum sol to generate γ-Al 2 o 3 The mass ratio is: 0%:100%; every 100g coating requires 15g of polyethylene glycol with an average molecular weight of 20,000 and 25g of nitric acid; the preparation of every 100g of Co modified ZSM-5 molecular sieve requires 300ml of n-hexane. According to the conversion ratio, calculate the required raw material ...

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Abstract

The invention discloses a catalyst based on a modified molecular sieve and hydrotalcite derived oxides and applied to a diesel engine. The catalyst adopts the Co modified ZSM-5 molecular sieve as a main catalyst, a CeO2-ZrO2 solid solution as a cocatalyst, adopts multi-metal modified hydrotalcite derived composite oxides and gamma-Al2O3 as coating base materials and adopts cordierite honeycomb ceramic as a catalyst support. A preparation technology comprises steps as follows: determination of the use quantity of the raw materials of the catalyst; preparation of the Co modified ZSM-5 molecular sieve and the multi-metal modified hydrotalcite derived composite oxides; preparation and coating of coating slurry. The catalyst can efficiently catalyze adsorption-reductive purification reaction of NOx in exhaust gas. By means of the synergistic effect of four metallic oxides, NOx adsorption performance and heat stability of the hydrotalcite derived oxides are improved. Meanwhile, a precious metal main catalyst is replaced with the Co modified ZSM-5 molecular sieve, so that the cost of the raw materials is reduced, and sulfur resistance and heat stability of the catalyst are 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] my country plans to fully implement the National 5 and National 6 emission regulations in 2017 and 2019 respectively, and the emission limits for NOx pollutants from diesel engines in the regulations are particularly strict. In order to efficiently control the NOx emissions of diesel engines and explore feasible technical routes for domestic diesel engines to meet the National 5 and National 6 emission regulations, relevant domestic and foreign enterprises and scientific research institutions have proposed a variety of technical means and combined solutions to deal with strict pollutant emission limits. Among them, Lean NOx Trap (LNT) technology or NOx Storag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/46B01J20/18B01D53/94B01D53/56
CPCY02C20/10B01J29/46B01D53/9413B01D2258/01B01J20/06B01J20/08B01J20/18
Inventor 宋崇林李博吕刚朱彦涛
Owner TIANJIN UNIV
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