Copper-based molecular sieve catalyst used for diesel engine NOx removing using low-temperature NH3-SCR and preparation method of copper-based molecular sieve catalyst

A technology of NH3-SCR and diesel engine, which is applied to molecular sieve catalysts, separation methods, chemical instruments and methods, etc. It can solve the problems of poor selectivity, low catalyst activity, and narrow activation temperature window, so as to prevent large-scale generation, improve removal efficiency, Taking into account the effect of selectivity

Inactive Publication Date: 2018-09-14
上海倍绿环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The technical problem to be solved by the present invention is to overcome the previous NH 3 -SCR vanadium-based catalysts have low activity at low temperature (450°C), and narrow activation temperature window (250-450°C), for copper and cerium loading According to the different temperature characteristics of the activity and selectivity of the catalyst in the future, according to the principle of complementary advantages, after many experiments and researches, the NH catalyst suitable for diesel vehicles has been researched and designed. 3 -Low temperature (100~550°C) wide reaction temperature window for SCR system, high activity / high selectivity copper cerium-based molecular sieve catalyst

Method used

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  • Copper-based molecular sieve catalyst used for diesel engine NOx removing using low-temperature NH3-SCR and preparation method of copper-based molecular sieve catalyst
  • Copper-based molecular sieve catalyst used for diesel engine NOx removing using low-temperature NH3-SCR and preparation method of copper-based molecular sieve catalyst
  • Copper-based molecular sieve catalyst used for diesel engine NOx removing using low-temperature NH3-SCR and preparation method of copper-based molecular sieve catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Synthesis ratio 1Al:1P:0.25Si:0.06Cu-TEPA:0.01Ce:1.6PA:40H2O

[0042] First, the synthesis of Cu-TEPA complex:

[0043] Weigh 48g of 20wt% CuSO4 solution and 12.62g of tetraethylenepentamine TEPA solution, mix the two, place on a magnetic stirrer and stir for 2 hours until completely dissolved;

[0044] Second, the synthesis of CuCe-TEPA complex:

[0045] Add the weighed Ce(NO3)3·6H2O with a mass of 4.34g to the solution, place it on a magnetic stirrer, and mix and stir for 2 hours until the two are fully mixed to form a CuCe-TEPA complex with a ratio of 0.01 Ce. Compound.

[0046] Third, the determination of the precursor quality of the silicon aluminum phosphorus oxide tetrahedron (SAPO-34) carrier element:

[0047] According to the ratio of synthetic elements: 1Al:1P:0.25Si:0.06Cu-TEPA:0.01Ce:1.6PA:40H2O. Each 72.85g pseudo-boehmite produces 51g Al2O3, every 115.3g phosphoric acid solution produces 98g H3PO4, every 15g white carbon black produces 15g SiO2, every 15g copper su...

Embodiment 2

[0052] Synthesis ratio: 1Al:1P:0.25Si:0.06Cu-TEPA:0.04Ce:1.6PA:40H2O

[0053] First, the synthesis of Cu-TEPA complex:

[0054] Weigh 48g of 20wt% CuSO4 solution and 12.62g of tetraethylenepentamine TEPA solution, mix the two, place them on a magnetic stirrer and stir for 2 hours until completely dissolved;

[0055] Second, the synthesis of CuCe-TEPA complex:

[0056] Add the weighed Ce(NO3)3·6H2O with a mass of 17.37g to the solution, place it on a magnetic stirrer, and mix and stir for 2 hours until the two are fully mixed to form a CuCe-TEPA complex with a ratio of 0.01 Ce. Compound.

[0057] Third, the determination of the precursor material quality of the silicon aluminum phosphorus oxide tetrahedron (SAPO-34) carrier element:

[0058] According to the ratio of synthetic elements: 1Al:1P:0.25Si:0.06Cu-TEPA:0.01Ce:1.6PA:40H2O. Each 72.85g pseudo-boehmite produces 51g Al2O3, every 115.3g phosphoric acid solution produces 98g H3PO4, every 15g white carbon black produces 15g SiO2, eve...

Embodiment 3

[0063] Synthesis ratio: 1Al:1P:0.25Si:0.06Cu-TEPA:0.06Ce:1.6PA:40H2O

[0064] First, the synthesis of Cu-TEPA complex:

[0065] Weigh 48g of 20wt% CuSO4 solution and 12.62g of tetraethylenepentamine TEPA solution, mix the two, place them on a magnetic stirrer and stir for 2 hours until completely dissolved;

[0066] Second, the synthesis of CuCe-TEPA complex:

[0067] Add the weighed Ce(NO3)3·6H2O with a mass of 26.05g to the solution, place it on a magnetic stirrer, and mix and stir for 2 hours until the two are fully mixed to form a CuCe-TEPA complex with a ratio of 0.01 Ce Compound.

[0068] Third, the determination of the precursor material quality of the silicon aluminum phosphorus oxide tetrahedron (SAPO-34) carrier element:

[0069] According to claim 3, the ratio of synthetic elements is: 1Al:1P:0.25Si:0.06Cu-TEPA:0.01Ce:1.6PA:40H2O. Each 72.85g pseudo-boehmite produces 51g Al2O3, every 115.3g phosphoric acid solution produces 98g H3PO4, every 15g white carbon black produces 15...

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Abstract

The invention relates to a copper-based molecular sieve catalyst used for diesel engine NOx removing using low-temperature NH3-SCR and a preparation method of the copper-based molecular sieve catalystand belongs to the technical field of diesel engine tail gas pollutant control. The catalyst uses silicon-aluminum-phosphorus-oxygen tetrahedron (SAPO-34) as the carrier, Cu as the main active component and Ce as the promoter component. Chemical element proportion used during the preparation is 1Al:1P:0.25Si:0.06Cu-TEPA:(0.01 / 0.04 / 0.06 / 0.08)Ce:1.6PA:40H2O. The preparation method specifically includes: synthesizing Cu-TEPA; loading the copper serving as the main active component, determining the loading capacity of the Ce serving as the promoter, loading the Ce serving as the promoter, and performing one-pot synthesizing of the CuCe-SAPO-34 integral structure. The copper-based molecular sieve catalyst and the preparation method thereof have the advantages that the copper and cerium molecular sieve catalyst is used to replace a traditional vanadium-based catalyst, the environmental harm of the catalyst is lowered, low-temperature activity and high-temperature and low-temperature selectivity are increased greatly, the catalyst can effectively reduce NOx in the wide temperature window of 150-550 DEG C, and the catalyst is high in sulfur resistance and hydrothermal aging resistance andapplicable to high-sulfur diesel oil and city road traffic conditions of China.

Description

Technical field [0001] The invention relates to a low-temperature NH 3 -SCR (Ammonia-Selective Catalytic Reduction) to remove NO from diesel engines x The copper-cerium-based molecular sieve catalyst, especially a kind of low-temperature activity containing both copper and cerium, has excellent low-temperature NH at 150~550℃ 3 -SCR removes diesel engine NO x The copper-cerium-based molecular sieve catalyst belongs to the technical field of diesel engine exhaust pollutant control. Background technique [0002] Combustion optimization combined with urea (Urea)-SCR is considered to be the NO of diesel vehicles under current technical conditions x The best solution to meet Euro VI or even higher emission standards. In recent years, Urea-SCR technology for vehicles has become the focus of attention at home and abroad. Urea-SCR is essentially NH 3 It is the selective catalytic reduction reaction of reducing agent, because urea does not directly interact with NO x Reaction, but is first...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/85B01D53/94B01D53/56
CPCB01D53/9413B01D2251/2062B01J29/85Y02T10/12
Inventor 李熙春
Owner 上海倍绿环保科技有限公司
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