Catalyst for preparing C2H4 by oxidative dehydrogenation of C2H6 by CO2 and preparation method of catalyst

A catalyst and dehydrogenation technology, used in carbon compound catalysts, physical/chemical process catalysts, catalysts, etc., can solve problems such as poor hydrothermal stability and weak carbon dioxide adsorption capacity

Active Publication Date: 2019-03-08
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the technical problems of poor hydrothermal stability and weak carbon dioxide adsorption capacity of the existing supported Cr catalyst carrier and the environmental problems caused by the use of Cr, the present invention provides a CO 2 Oxygen C 2 h 6 Dehydrogenation to C 2 h 4 Catalyst and its preparation method

Method used

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  • Catalyst for preparing C2H4 by oxidative dehydrogenation of C2H6 by CO2 and preparation method of catalyst
  • Catalyst for preparing C2H4 by oxidative dehydrogenation of C2H6 by CO2 and preparation method of catalyst
  • Catalyst for preparing C2H4 by oxidative dehydrogenation of C2H6 by CO2 and preparation method of catalyst

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Embodiment 1

[0032] 1.67g of ZnCl 2 Dissolve in 24g of deionized water, stir evenly, add 10g of SAPO-34 zeolite molecular sieve carrier, then stir for 2h in a constant temperature water bath at 80°C (immersion for 2h), then centrifuge the obtained mixture, and dry the obtained solid at 110°C for 10h , and then calcined at 540°C for 3h to obtain CO 2 Oxygen C 2 h 6 Dehydrogenation to C 2 h 4 Catalyst, by the weight of zinc, the massfraction of zinc in the catalyst is 2% (recorded as Zn 2 / SAPO-34).

Embodiment 2

[0034] 0.68gZn(Ac) 2 2H 2 O, 1.83g ZnSO 4 ·7H 2 O, 3.87gZn(NO 3 ) 2 ·6H 2 O was dissolved in 24g of deionized water respectively, and after stirring evenly, 10g of SSZ-13 zeolite molecular sieve carrier was added, and then stirred for 2h in a constant temperature water bath at 80°C (immersion for 2h), and then the obtained mixture was centrifuged, and the separated solid was dried at 110°C 10h, and then roasted at 540°C for 3h to obtain CO 2 Oxygen C 2 h 6 Dehydrogenation to C 2 h 4 Catalyst, by the weight of zinc, the massfraction of zinc in the catalyst is respectively 0.50%, 1.00%, 2.00% (respectively denoted as Zn 0.5 / SSZ-13, Zn 1 / SSZ-13, Zn 2 / SSZ-13). Zn 2 / SSZ-13 is subjected to water vapor passivation treatment at 650°C, the treatment time is 10h, and the water volume is 3mL / h, and the passivated CO 2 Oxygen C 2 h 6 Dehydrogenation to C 2 h 4 Catalyst (denoted as Zn 2 / SSZ-13-D).

Embodiment 3

[0036] 26.98g of Zn(NO 3 ) 2 ·6H 2 O was dissolved in 24g of deionized water, and after stirring evenly, 10g of SSZ-13 zeolite molecular sieve carrier was added, then stirred for 2h in a constant temperature water bath at 80°C (immersion for 2h), and then the obtained mixture was centrifuged, and the separated solid was dried at 110°C for 10h , and then calcined at 540°C for 3h to obtain CO 2 Oxygen C 2 h 6 Dehydrogenation to C 2 h 4 Catalyst, by the weight of zinc, the massfraction of zinc in the catalyst is 10% (recorded as Zn 10 / SSZ-13).

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Abstract

The invention provides a catalyst for preparing C2H4 by oxidative dehydrogenation of C2H6 by CO2 and a preparation method of the catalyst. The catalyst comprises a support and an active component, wherein the support is a microporous zeolite molecular sieve with pore size distributed in the range of 0.2-0.4 nm, the active component is zinc ions, in terms of weight of zinc, the catalyst contains 0.5%-15% by mass of zinc, and the microporous zeolite molecular sieve is at least one of SAPO-34 and SSZ-13. The support has the advantages of high hydrothermal stability, high specific surface area, more surface protonic acid sites, exchangeable cations and the like, and the problem that the catalyst support is poor in hydrothermal stability in the prior art can be effectively solved. The zinc ionstaken as the active substance are non-toxic and have better dehydrogenation capability, and generation of H2 by a reaction is facilitated. CO2 adsorbability of the catalyst can be improved effectively by the zinc ions, so that CO2 conversion rate and C2H4 selectivity are increased.

Description

technical field [0001] The invention belongs to the technical field of preparing ethylene, in particular to a CO 2 Oxygen C 2 h 6 Dehydrogenation to C 2 h 4 Catalysts and their preparation methods. Background technique [0002] Carbon dioxide is the final oxide of carbon and carbon-containing compounds, and it is also the most abundant carbon source in nature. Among the "greenhouse gases" that cause global warming, CO 2 The contribution to the greenhouse effect is 55%. Therefore, the development of CO 2 The research on resource utilization is very important. h 2 The source is more convenient, therefore, CO 2 Catalytic hydrogenation is a research hotspot at present. However, currently most CO 2 The reaction conditions of catalytic hydrogenation are relatively harsh, and the cost of hydrogen production technology is relatively high, which limits the CO 2 Further application of catalytic hydrogenation technology in industry. Ethane, as the hydrocarbon with the high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/70B01J29/85C07C5/42C07C11/04
CPCC07C5/42B01J29/005B01J29/7049B01J29/85C07C2529/85C07C2529/70B01J2229/18C07C11/04Y02P20/52
Inventor 刘家旭杨金鹏谢宏彬贺宁郭洪臣
Owner DALIAN UNIV OF TECH
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