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A highly stable synthetic gas conversion catalyst and preparation method thereof

A synthesis gas conversion and catalyst technology, which can be used in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems such as sintering of metal active centers, and achieve long life, easy industrial application, and good stability. Effect

Active Publication Date: 2021-06-08
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a stable bimetallic catalyst and a preparation method thereof, which solves the problem of sintering of the active center of the catalyst metal and improves the catalytic performance at the same time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Step A: Zn(NO 3 ) 2 ·6H 2 O, Co(NO 3 ) 2 ·6H 2 O, Ga(NO 3 ) 3 .xH 2 O, urea, with Co 2+ : Ga 3+ : Zn 2+ : The ratio of urea=2:1:1:8 is dissolved in deionized water, and a certain amount of Al is installed 2 o 3 Add the above mixed solution into the reactor, and crystallize at 100°C for 12h. Wash by suction filtration, wash with deionized water until neutral, and dry.

[0016] Step B: The catalyst precursor prepared in step (A) is preferably calcined and reduced in hydrogen at 700° C. for 2 hours (flow rate 40 mL / min), and the temperature increase rate is 5° C. / min.

[0017] That is, the CoGa particles embedded in the carrier are prepared 2 Ga 1 -ZnAl 2 o 4 @Al 2 o 3 For the catalyst (that is, the well structure), the actual loading amount of Co is 1%, and the actual loading amount of Ga is 0.8%.

Embodiment 2

[0025] Zn(NO 3 ) 2 ·6H 2 O, Co(NO 3 ) 2 ·6H 2 O, Ga(NO 3 ) 3 .xH 2 O, urea, with Co 2+ : Ga 3+ : Zn 2+ : The ratio of urea=0.3:1:3:12 is dissolved in deionized water, and a certain amount of Al is installed 2 o 3 Add the above mixed solution into the reactor, and crystallize at 100°C for 12h. Wash by suction filtration, wash with deionized water until neutral, and dry.

[0026] Step B: The catalyst precursor prepared in step (A) is preferably calcined and reduced in hydrogen at 700° C. for 2 hours (flow rate 40 mL / min), and the temperature increase rate is 5° C. / min.

[0027] That is to prepare Co 0.42 Ga 1 -ZnAl 2 o 4 @Al 2 o 3 For the catalyst (at this time, the stability of the catalyst is good), the actual loading amount of Co is 0.5%, and the actual loading amount of Ga is 1.4%.

Embodiment 3

[0029] Zn(NO 3 ) 2 ·6H 2 O, Co(NO 3 ) 2 ·6H 2 O, Ga(NO 3 ) 3 .xH 2 O, urea, with Co 2+ : Ga 3+ : Zn 2+ : The ratio of urea=0.1:1:3:8 is dissolved in deionized water, and a certain amount of Al is installed 2 o 3 Add the above mixed solution into the reactor, and crystallize at 100°C for 12h. Wash by suction filtration, wash with deionized water until neutral, and dry.

[0030] Step B: The catalyst precursor prepared in step (A) is preferably calcined and reduced in hydrogen at 700° C. for 2 hours (flow rate 40 mL / min), and the temperature increase rate is 5° C. / min.

[0031] That is to prepare Co 0.12 Ga 1 -ZnAl 2 o 4 @Al 2 o 3 For the catalyst (at this time, the stability of the catalyst is good), the actual loading amount of Co is 0.1%, and the actual loading amount of Ga is 0.8%.

[0032] The catalyst obtained in embodiment 2 and embodiment 3 is used for syngas reaction, is consistent with the catalyst obtained in embodiment 1, and also shows good activi...

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Abstract

A highly stable synthesis gas conversion catalyst and a preparation method thereof belong to the field of synthesis gas conversion. The catalyst is a multi-level structure constructed of alumina pellets and hydrotalcite. Taking advantage of the confinement effect of the laminates during the topological transformation of the hydrotalcite precursor, Ga 0 with Ga 3+ The interaction between them leads to a stable CoGa catalyst. The advantage is that it has a well structure and Ga 0 with Ga 3+ Together with the stable CoGa particles, the catalyst has good stability in the synthesis gas conversion reaction. In addition, the present invention has a multi-level structure, which is convenient for industrial application.

Description

technical field [0001] The invention belongs to the field of synthesis gas conversion, and in particular provides a synthesis gas conversion catalyst with stable and dispersed active centers and a preparation method thereof. Background technique [0002] Supported metal catalysts are widely used in many fields such as petrochemical, coal chemical, fine chemical, and biomass conversion and utilization. However, supported metal catalysts often face the problem of deactivation due to sintering of active centers during the reaction process. In industrial applications, the catalyst needs to maintain its catalytic activity for a long time, and the stability of the active center is particularly important. Therefore, the preparation of highly stable supported metal catalysts with anti-sintering has great practical application value. [0003] At present, a lot of research has been done on improving the dispersion stability of metal active centers. The ability to resist sintering i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/825B01J37/18C07C29/156C07C31/02
CPCB01J23/825B01J37/18C07C29/156C07C31/02
Inventor 何静郭海朱彦儒安哲宋红艳舒心项顼
Owner BEIJING UNIV OF CHEM TECH
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