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A composite catalyst for directly producing aromatics from synthesis gas and its preparation method

A composite catalyst and synthesis gas technology, which is applied in the preparation of liquid hydrocarbon mixtures, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of no stability research, catalyst deactivation, etc., and achieve good industrial application prospects and high aromatics selection performance, excellent stability

Active Publication Date: 2021-05-04
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Prepared Fe-MnO / GaZSM-5 composite catalyst by Guan etc., obtained higher aromatics selectivity (40%), but catalyst will deactivate rapidly within 30 hours (Catal.Today, 1996,30,207-213)
Na-Zn-Fe 5 C 2 Combining with the hierarchically porous HZSM-5 molecular sieve, high aromatics selectivity (51%) was achieved while achieving high CO conversion (85%), but Ma et al. did not perform the related stability Research (Chem., 2017, 3, 323-333)

Method used

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  • A composite catalyst for directly producing aromatics from synthesis gas and its preparation method
  • A composite catalyst for directly producing aromatics from synthesis gas and its preparation method
  • A composite catalyst for directly producing aromatics from synthesis gas and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Preparation of Fe with Fe:Mn molar ratio of 1:1 3 o 4 @MnO 2 catalyst:

[0041] Dissolve 100mmol of ferrous sulfate in 1L of deionized water, then add 100g of PVP, and stir until completely dissolved. The above solution was aged in an oil bath at 70°C for 10 h, and then 400 mmol of sodium hydroxide and 100 mmol of potassium permanganate were added. The precipitate was washed with deionized water and dried at 100°C to obtain Fe with a molar ratio of Fe:Mn of 1:1. 3 o 4 @MnO 2 .

[0042] Preparation of hollow HZSM-5 zeolite:

[0043] Mix HZSM-5 zeolite with 1.0M tetrapropylammonium hydroxide (TPAOH) aqueous solution at a solid-to-liquid ratio of 1g / 50ml. Hydrothermal reaction at 150°C for 120h. After centrifugal separation, the solid product was washed with deionized water, dried and then calcined at 550°C for 10 hours to obtain a hollow HZSM-5 zeolite.

[0044] Preparation of composite catalyst:

[0045] Will Fe 3 o 4 @MnO 2 Physically mix with hollow HZSM-...

Embodiment 2

[0054] Preparation of Fe with Fe:Mn molar ratio of 2:1 3 o 4 @MnO 2 catalyst:

[0055] Dissolve 100mmol of ferrous sulfate in 1L of deionized water, then add 100g of PVP, and stir until completely dissolved. The above solution was aged in an oil bath at 50° C. for 10 h, and then 500 mmol of sodium hydroxide and 50 mmol of potassium permanganate were added. The precipitate was washed with deionized water and dried at 100°C to obtain Fe with a molar ratio of Fe:Mn of 2:1. 3 o 4 @MnO 2 .

[0056] Preparation of hollow HZSM-5 zeolite:

[0057] Mix HZSM-5 zeolite with 0.8M tetrapropylammonium hydroxide (TPAOH) aqueous solution at a solid-to-liquid ratio of 1g / 5ml; hydrothermally react at 140°C for 5h; centrifuge, wash the solid product with deionized water, dry it at 400 Calcined at ℃ for 10h to obtain hollow HZSM-5 zeolite.

[0058] Preparation of composite catalyst:

[0059] Will Fe 3 o 4 @MnO 2 Physically mix with hollow HZSM-5 zeolite at a mass ratio of 1:5.

[00...

Embodiment 3

[0062] Preparation of Fe with Fe:Mn molar ratio of 4.5:1 3 o 4 @MnO 2 catalyst:

[0063] Dissolve 100mmol of ferrous sulfate in 1L of deionized water, then add 100g of PVP, and stir until completely dissolved. The above solution was aged in an oil bath at 30° C. for 10 h, and then 600 mmol of sodium hydroxide and 22.2 mmol of potassium permanganate were added. The precipitate was washed with deionized water and dried at 100°C to obtain Fe with a molar ratio of Fe:Mn of 4.5:1. 3 o 4 @MnO 2 .

[0064] Preparation of hollow HZSM-5 zeolite:

[0065] Mix HZSM-5 zeolite with 0.1M tetrapropylammonium hydroxide (TPAOH) aqueous solution according to the solid-to-liquid ratio of 1g / 30ml; hydrothermally react at 140°C for 48h; centrifuge, wash the solid product with deionized water, dry it at 450 Calcined at ℃ for 4h to obtain hollow HZSM-5 zeolite.

[0066] Preparation of composite catalyst:

[0067] Will Fe 3 o 4 @MnO 2 Physically mix with hollow HZSM-5 zeolite at a mass r...

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Abstract

The present invention provides a kind of preparation method of synthetic gas aromatic hydrocarbon composite catalyst, core-shell Fe 3 o 4 @MnO 2 Physically mix with hollow HZSM-5 zeolite at a mass ratio of 1:0.5-5 to obtain a composite catalyst. The preparation process of the catalyst of the present invention is simple, and can be applied to large-scale industrial production; under the premise of high reactivity, it has high selectivity of aromatic hydrocarbons, and the catalyst has excellent stability; the range of applicable reaction conditions is large, and it has the advantages of Good prospects for industrial application.

Description

technical field [0001] The invention relates to the technical field of producing aromatic hydrocarbons directly from synthesis gas, in particular a hollow HZSM-5 molecular sieve and a core-shell Fe 3 o 4 @MnO 2 Composite catalyst and its preparation method. Background technique [0002] Aromatic hydrocarbons are a very important basic raw material of organic chemical industry and polymer chemical industry, and are widely used in synthetic fibers, resins, rubber and various fine chemicals. In industry, aromatics are mainly produced through catalytic reforming, cracking and alkylation of petroleum. In addition, aromatics can also be obtained by cracking gasoline, a by-product of ethylene production. However, with the continuous increase of production and consumption, oil resources are increasingly depleted, and the problem of oil supply shortage will be faced in the near future. The severe energy situation requires us to look for energy sources to replace petroleum in the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/48C10G2/00
CPCB01J23/8892B01J29/40B01J29/48B01J35/0006B01J2229/186C10G2/334C10G2300/1096C10G2300/70
Inventor 定明月徐艳飞王捷马光远
Owner WUHAN UNIV
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