Catalyst for directly preparing olefin and aromatic hydrocarbon through synthetic gas and application thereof

A catalyst and synthesis gas technology, applied in molecular sieve catalysts, physical/chemical process catalysts, hydrocarbon production from carbon oxides, etc., can solve the problems of Fischer-Tropsch synthesis catalyst activity reduction, aromatics isomerization, etc., to reduce product isomerization Effects of hydrogenation or hydrogenation side reactions, prolonging life, and promoting product diffusion

Active Publication Date: 2019-04-05
JIANGNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problem that the Fischer-Tropsch synthesis catalyst and the aromatization catalyst are mixed with each other, the activity of the Fischer-Tropsch synthesis catalyst is easily reduced, and the isomerization of the aromatic hydrocarbons obtained by synthesis is solved. Catalyst and its application, the catalyst can realize from containing CO or CO 2 One-step highly selective hydrogenation of syngas or a mixture of the two to co-produce olefins and aromatics

Method used

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  • Catalyst for directly preparing olefin and aromatic hydrocarbon through synthetic gas and application thereof
  • Catalyst for directly preparing olefin and aromatic hydrocarbon through synthetic gas and application thereof
  • Catalyst for directly preparing olefin and aromatic hydrocarbon through synthetic gas and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0042] The first step is to take a certain amount of layered HZSM-5 molecular sieve (thickness is about 45nm), the silicon-aluminum ratio (Si / Al) is 15, and the oxide of zinc is deposited on the outer surface of the molecular sieve by atomic layer deposition. Specifically, put the molecular sieve into the cavity of the atomic layer deposition instrument, the cavity temperature is 100°C, and use the following mode to cycle deposit zinc oxide: diethyl zinc for 1 second, nitrogen purge for 5 seconds, water for 0.5 seconds, nitrogen purge for 5 seconds seconds, a total of 20 cycles can be obtained Zn modified HZSM-5 molecular sieve;

[0043] In the second step, the molecular sieve obtained by Zn modification is impregnated in a solution with a mass ratio of tetraethyl orthosilicate, CTAB, ethanol and water of 1:0.8:1:0.5, and is stirred continuously for 12 hours, and then placed in a hydrothermal kettle for 150 ℃ for 24 hours; cool down, take out and separate, dry at 120℃ for 12h,...

Embodiment 2

[0047] The first step is to take a certain amount of layered HZSM-5 molecular sieve (thickness about 15nm), the silicon-aluminum ratio (Si / Al) is 15, and deposit zirconium oxide on the outer surface of the molecular sieve by atomic layer deposition. Specifically, put the molecular sieve into the chamber of the atomic layer deposition instrument at a chamber temperature of 100°C, and use the following modes to cycle deposit zirconia: zirconium dichloride for 1 second, nitrogen purge for 5 seconds, water for 0.5 seconds, nitrogen gas Wash for 5 seconds and cycle 20 times to obtain Zr-modified HZSM-5 molecular sieve;

[0048] In the second step, the molecular sieve obtained by zirconium modification is immersed in a solution of ethyl orthosilicate, CTAB, ethanol and water with a mass ratio of 1:0.8:1:0.5, and is stirred continuously for 12 hours, and then placed in a hydrothermal kettle for 150 ℃ for 24 hours; cool down, take out and separate, dry at 120℃ for 12h, and roast at 50...

Embodiment 3

[0052] The first step, with the first step in embodiment 2;

[0053] In the second step, the zirconium-modified molecular sieve obtained in the first step is immersed in a solution with a mass ratio of tetraethyl orthosilicate, CTAB, ethanol and water of 2:0.8:1:0.5, and is stirred continuously for 12 hours, and then placed in water React in a hot kettle at 150°C for 24h; cool down, take out and separate, dry at 120°C for 12h, and roast at 500°C for 5h to obtain SiO 2 Molecular sieve with thicker coating;

[0054] In the third step, the molecular sieve obtained in the second step is impregnated in a mixed solution of ferric nitrate and potassium nitrate with a certain content by using the equal volume impregnation method, and then the solvent is removed by rotary evaporation, dried at 120°C for 12h, and roasted at 500°C for 5h. Catalyst sample C; after analysis, the mass fraction of HZSM-5 in catalyst C is 46.9%, the mass fraction of zirconia is 0.7%, and the SiO 2 The mass ...

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Abstract

The invention discloses a catalyst for directly preparing olefin and aromatic hydrocarbon through synthetic gas and application thereof and belongs to the technical field of CO and CO2 catalytic conversion. The catalyst is composed of a Fischer-Tropsch synthetic active component, an auxiliary, an inert material and a sheet molecular sieve, a part of the auxiliary is loaded on the molecular sieve,the inert material coats the outer layer of the molecular sieve, and the Fischer-Tropsch synthetic active component and the other part of the auxiliary are loaded on the inert material. When CO2 or COor a mixture of the both on a catalyst system is in proper reaction conditions, olefin (C2-C5) content in a gaseous-phase hydrocarbon product can reach 70%, total content of aromatic hydrocarbon in liquid-stage hydrocarbon is up to higher than 95%, p-xylene content is up to 60%, and stability of the catalyst is improved substantially. The invention provides a new route capable of directly preparing olefin and aromatic hydrocarbon through CO2 and CO hydrogenation.

Description

technical field [0001] The invention relates to a catalyst for the direct preparation of olefins and aromatics from synthesis gas and its application, belonging to CO, CO 2 Catalytic conversion technology field. Background technique [0002] Low-carbon olefins including ethylene, propylene and butene, and light aromatics (Benzene-Toluene-Xylene, BTX) including benzene, toluene and xylene are important chemical raw materials, which mainly come from the cracking of naphtha. With the reduction of crude oil resources and the increasingly prominent environmental problems, it is challenging and unsustainable to obtain olefins and aromatics from petroleum routes. Limited petroleum resources and environmental crisis have stimulated the research and development of non-petroleum-based carbon resource conversion chemistry. Therefore, non-petroleum routes to produce low-carbon olefins and aromatics have attracted more and more attention. Syngas (CO+H 2 or CO 2 +H 2 ) is a key connec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/48B01J29/46C07C1/04C07C11/02C07C9/04C07C9/00C07C15/04C07C15/06C07C15/08C07C15/02
CPCB01J29/46B01J29/48C07C1/044C07C11/02C07C9/04C07C9/00C07C15/04C07C15/06C07C15/08C07C15/02Y02P20/52
Inventor 刘小浩胥月兵姜枫刘冰
Owner JIANGNAN UNIV
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