Preparation method and application of Cu-SSZ-13 catalyst

A catalyst, cu-ssz-13 technology, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of raw sewage, unfavorable large-scale promotion and application of catalysts, and low yield, etc. No waste water pollution, excellent N2 generation selectivity, high catalytic activity

Inactive Publication Date: 2017-09-01
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commonly used method for preparing Cu-SSZ-13 catalyst is liquid phase ion exchange method, but the preparation of SSZ-13 support by this method requires the use of expensive template N, N, N-trimethyladamantane ammonium hydroxide, which is not conducive to the Large-scale promotion and application of catalysts
In order to reduce the production cost of the catalyst, the technology of preparing Cu-SSZ-13 with cheap templates such as Cu-TEPA complexes or choline chloride has also received extensive attention, but the Cu-SSZ-13 catalyst prepared by it has The hydrothermal stability still needs to be further improved
At the same time, the crystallization process of all preparation methods is completed in a liquid phase environment, which not only produces sewage in the preparation process, but also has a low yield.

Method used

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  • Preparation method and application of Cu-SSZ-13 catalyst
  • Preparation method and application of Cu-SSZ-13 catalyst
  • Preparation method and application of Cu-SSZ-13 catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0045] The preparation process of the Na-SSZ-13 molecular sieve carrier of this embodiment is as follows: 1.412g of sodium silicate, 1.368g of silicon dioxide, 0.65g of aluminum sulfate, 0.8g of N,N,-dimethyl-N -Ethylcyclohexylammonium bromide template and 0.05g of seed crystal H-SSZ-13 were put into a mortar for grinding, and after being evenly ground, they were placed in a reaction kettle for crystallization at 180°C for 5 days, and then suction filtered and washed. Put the filter cake in an oven at 100°C overnight, and finally bake it in air at 600°C for 6 hours to obtain a Na-SSZ-13 molecular sieve carrier.

Embodiment 2

[0047] The preparation process of the Cu-SSZ-13 catalyst of the present embodiment is as follows: the Na-SSZ-13 molecular sieve carrier prepared in Example 1 and 1mol / L NH 4 NO 3 The solution was stirred at 80°C for 5h, then filtered, washed and dried again to obtain NH 4 - SSZ-13 powdered molecular sieve. NH will be produced 4 -SSZ-13 molecular sieve and 0.1mol / L Cu(NO 3 ) 2 The solution was stirred at room temperature for 24 hours, and then filtered, washed, dried and calcined again to obtain Cu-SSZ-13 powder catalyst. The prepared catalyst is pressed into tablets, ground, sieved, and 40-60 meshes are taken for later use. Catalysts with different Cu loadings passed Cu(NO 3 ) 2 The number of times of ion exchange of the solution is adjusted. In this embodiment, Cu with a mass percentage of 1.7% Cu loading is obtained through 1 ion exchange. 1.7 - SSZ-13 catalyst.

Embodiment 3

[0049] The preparation process of the Cu-SSZ-13 catalyst of the present embodiment is as follows: the Na-SSZ-13 molecular sieve carrier prepared in Example 1 and 1mol / L NH 4 NO 3 The solution was stirred at 80°C for 5h, then filtered, washed and dried again to obtain NH 4 - SSZ-13 powdered molecular sieve. The prepared NH4-SSZ-13 molecular sieve was mixed with 0.1mol / L Cu(NO 3 ) 2 The solution was stirred at room temperature for 24 hours, and then filtered, washed, dried and calcined again to obtain Cu-SSZ-13 powder catalyst. The prepared catalyst is pressed into tablets, ground, sieved, and 40-60 meshes are taken for later use. Catalysts with different Cu loadings passed Cu(NO 3 ) 2 The number of times of ion exchange of the solution is adjusted, and the present embodiment obtains Cu with a mass percentage of 2.2% Cu loading through 2 ion exchanges. 2.2 - SSZ-13 catalyst.

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Abstract

The invention provides a preparation method and application of a Cu-SSZ-13 catalyst. The preparation method comprises the following steps: 1) putting raw materials including a silicon source, an aluminum source, a template agent and seed crystals into a mortar, and grinding to form a uniform mixture; 2) feeding the mixture into a reaction kettle and crystallizing; after cooling, washing and drying, roasting to obtain an Na-SSZ-13 molecular sieve carrier; 3) preparing an ammonium nitrate solution, and adding into the Na-SSZ-13 molecular sieve carrier; after carrying out ion exchange, filtering, washing and drying to obtain an NH4-SSZ-13 molecular sieve; 4) preparing a copper nitrate solution and adding into the NH4-SSZ-13 molecular sieve; after carrying out ion exchange, filtering, drying and roasting to obtain the Cu-SSZ-13 catalyst. The Cu-SSZ-13 catalyst prepared by the preparation method has excellent NH3-SCR (Selective Catalytic Reduction) catalytic activity, N2 selectivity, hydrothermal stability, and H2O and SO2 positioning resisting properties, and is applicable to purification of tail gas of diesel vehicles.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a preparation method and application of a Cu-SSZ-13 catalyst. Background technique [0002] Currently, in NH 3 Selective catalytic reduction of NOx(NH 3 -SCR), because of its high NOx conversion rate, good fuel economy, simple engine control and other advantages, has been widely used in diesel vehicle exhaust purification, and the catalyst is the core of this technology. where V 2 o 5 -WO 3 (MoO 3 ) / TiO 2 Catalysts have been used industrially for many years, but there are still some disadvantages, such as narrow operating temperature window, N 2 Low selectivity, active component V has biological toxicity, endangers the ecological environment and human health, etc. Other developed non-V catalysts, such as oxide catalysts Ce-W, Fe-Ti, and Cu-based or Fe-based molecular sieve catalysts supported by ZSM-5, beta, etc., have narrow temperature operating windows and poor hydro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/76B01D53/94B01D53/56
CPCB01D53/9413B01D2255/20761B01D2255/50B01D2258/01B01D2258/012B01J29/763B01J2229/16B01J2229/18Y02A50/20Y02T10/12
Inventor 贺泓单玉龙晏子頔石晓燕肖丰收章凌
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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