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CuCe-SAPO-34 molecular sieve catalyst, as well as preparation method and use thereof

A technology of cuce-sapo-34 and molecular sieve, which is applied in molecular sieve catalysts, separation methods, chemical instruments and methods, etc., can solve the problems of not being able to meet the requirements of diesel vehicle exhaust NOx purification, low initial activity, etc., and achieve excellent catalytic activity and Effects of water resistance, reduction of adverse effects, and improvement of high-temperature activity

Inactive Publication Date: 2015-09-09
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

However, using the molecular sieve disclosed in the above prior art for NH 3 -SCR reaction, NH 3 - The initial activity of SCR is low, which cannot meet the requirements of diesel vehicle exhaust NOx purification

Method used

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  • CuCe-SAPO-34 molecular sieve catalyst, as well as preparation method and use thereof
  • CuCe-SAPO-34 molecular sieve catalyst, as well as preparation method and use thereof
  • CuCe-SAPO-34 molecular sieve catalyst, as well as preparation method and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Add pseudo-boehmite into deionized water and stir, then add orthophosphoric acid and fumed silica, add optional copper salt and tetraethylenepentamine after mixing, add optional cerium salt and n-propylamine after fully stirring ;

[0039] Put the fully stirred gel into a hydrothermal reaction kettle for crystallization at 180°C for 72 hours. After the crystallization reaction is completed, cool at room temperature, separate the solid crystalline product from the mother liquor, wash with deionized water until neutral, and dry at 100°C for 12 hours , and then calcined in air at a calcining temperature of 700° C., a heating rate of 1° C. / min during the calcining process, and a calcining time of 5 hours to obtain a molecular sieve catalyst.

[0040] Controlling the consumption of each reactant makes the reaction system have the following mass ratio relationship:

[0041] Among them, control AlOOH, H 3 PO 4 , SiO 2 、H 2 The molar ratios of O, copper salt, tetraethylene...

Embodiment 2

[0049] Control AlOOH, H 3 PO 4 , SiO 2 、H 2 The mol ratio of O, copper salt, tetraethylenepentamine, cerium salt and n-propylamine is 1:1:0.25:40:0.06:0.072:0.06:1.6, crystallization temperature is 150 ℃, all the other are identical with embodiment 1, the catalyst The performance evaluation is shown in the table below.

[0050]

Embodiment 3

[0052] Control AlOOH, H 3 PO 4 , SiO 2 、H 2 The mol ratio of O, copper salt, tetraethylenepentamine, cerium salt and n-propylamine is 1:1:0.25:40:0.06:0.072:0.06:1.6, crystallization temperature is 200 ℃, all the other are identical with embodiment 1, the catalyst The performance evaluation is shown in the table below.

[0053]

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Abstract

The invention provides a CuCe-SAPO-34 molecular sieve catalyst, as well as a preparation method and use thereof. The method comprises the following steps: adding pseudo-boehmite in deionized water, stirring, then adding ortho-phosphoric acid and fumed silica, uniformly mixing, then adding copper salt and tetraethylenepentamine, sufficiently mixing, adding cerate and n-propylamine, loading the completely mixed gel in a hydrothermal reaction kettle to crystallize, cooling at room temperature, separating the solid crystallized product from the mother liquor, washing to neutral, drying, and roasting in air to obtain the CuCe-SAPO-34 molecular sieve catalyst. The CuCe-SAPO-34 molecular sieve catalyst is prepared through the adoption of the hydrothermal synthesis method, and the molecular sieve catalyst with excellent NH3-SCR catalytic activity and water resistance is obtained by adjusting the loading amount of cerium through the control of the input of the cerate.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and relates to a CuCe-SAPO-34 molecular sieve catalyst, a preparation method and an application thereof. Background technique [0002] Take NH 3 Selective catalytic reduction of NOx or NH as a reducing agent 3 -SCR technology plays an extremely important role in the process of catalytic removal of NOx, and its key core is the development of SCR catalyst system. Due to the characteristics of diesel vehicles with variable operating conditions, large exhaust temperature changes, complex exhaust gas composition, and rapid flow changes, an excellent automotive catalyst must have the following properties: high catalytic activity in a wide temperature window, hydrothermal stability High resistance, high mechanical strength, H resistance 2 O, SO 2 And HC poisoning ability, anti-high airspeed ability and so on. While the current commonly used V 2 o 5 -WO 3 (MoO 3 ) / TiO 2 Although catalysts hav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/85B01D53/94B01D53/56
CPCC01B39/54
Inventor 贺泓牛璨石晓燕连志华丁世鹏
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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