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Modified zinc oxide-loaded cobalt catalyst and preparation method thereof

A technology of cobalt catalyst and zinc oxide, which is applied in the field of modified zinc oxide-supported cobalt Fischer-Tropsch synthesis catalyst and its preparation, and can solve the problems of insufficient economic efficiency in the selectivity process of catalyst active products

Active Publication Date: 2011-04-06
中科潞安能源技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In conclusion, existing studies have shown that the cobalt-zinc Fischer-Tropsch synthesis catalytic system has good application prospects, but in terms of catalyst activity, C 5 +There are still big deficiencies in product selectivity and process economy

Method used

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  • Modified zinc oxide-loaded cobalt catalyst and preparation method thereof

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Embodiment 1

[0022] The modified zinc oxide supported cobalt catalyst was prepared according to the ratio of Co:W:Zn=5:30:36. Prepare 0.1M zinc acetate ethanol solution, prepare 0.5M ammonia solution as a precipitant, precipitate zinc salt at pH=6.0, 40°C, wash the filter cake to neutral, dry at 80°C, and roast at 300°C for 5 After hours, the obtained sample was broken into powders below 200 mesh for use. According to the set ratio, ammonium paratungstate aqueous solution was prepared, and tungsten was loaded on the obtained sample by the equal volume method, dried at 80°C, and roasted at 500°C for 3 hours, and the obtained sample was broken into powder below 200 mesh before use. Prepare a mixed solution of lanthanum nitrate and cobalt nitrate according to the amount of La accounting for 0.01 wt% in the final catalyst and cobalt. The cobalt is loaded by the equal volume method. The sample is dried at 80°C and calcined at 400°C for 3 hours to obtain the target catalyst. Catalyst compositio...

Embodiment 2

[0024] The modified zinc oxide supported cobalt catalyst was prepared according to the ratio of Co:W:Zn=5:45:48. Prepare 1.0M zinc acetate aqueous solution, prepare 1.5M ammonia solution as a precipitant, precipitate zinc salt at pH=9.0, 60°C, wash the filter cake until neutral, dry at 120°C, and roast at 500°C for 3 hours , The resulting sample was broken into powder below 200 mesh for later use. According to the set ratio, ammonium paratungstate aqueous solution was prepared, tungsten was loaded on the obtained sample by the equal volume method, dried at 120°C, and calcined at 500°C for 3 hours, and the obtained sample was broken into powder below 200 mesh before use. According to the amount of Ce accounting for 1.5wt% and cobalt in the final catalyst, a mixed solution of cerium nitrate and cobalt nitrate was prepared, and the cobalt was loaded by the equal volume method. The sample was dried at 100°C and calcined at 500°C for 3 hours to obtain the target catalyst. Catalyst...

Embodiment 3

[0026] The modified zinc oxide supported cobalt catalyst was prepared according to the ratio of Co:W:Zn=18:30:36. Prepare 1.0M zinc nitrate aqueous solution, prepare 1.0M ammonia solution as precipitant, precipitate zinc salt at pH=8.0, 80°C, wash the filter cake until neutral, dry at 100°C, and roast at 400°C for 4 hours , The resulting sample was broken into powder below 200 mesh for later use. According to the set ratio, the ammonium tungstate pentahydrate aqueous solution was prepared, and the obtained sample was loaded with tungsten by the equal volume method, dried at 100°C, and roasted at 300°C for 5 hours. The obtained sample was crushed into a powder below 200 mesh before use. According to the amount of Cr accounting for 8wt% and cobalt in the final catalyst, a mixed solution of chromium nitrate and cobalt nitrate was prepared, and the cobalt was loaded by the equal volume method. The sample was dried at 100°C and calcined at 450°C for 3 hours to obtain the target cat...

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Abstract

The invention relates to a modified zinc oxide-loaded cobalt catalyst. The catalyst consists of the following components in percentage by mass: 5 to 18 percent of Co, 30 to 45 percent of W and 36 to 48 percent of Zn, wherein other transition metal aids account for 0.01 to 15 weight percent of the total weight of the catalyst and refer to Cr, Ni, La or Ce. The catalyst is prepared by incipient-wetness impregnation. A preparation method of the invention has the advantages of realizing high-activity and high-selectivity Tropsch synthesis under the catalysis of a low-cobalt load catalyst and effectively lowering the production cost of a cobalt-based catalyst.

Description

technical field [0001] The invention belongs to a catalyst and a preparation method thereof, in particular to a modified zinc oxide-loaded cobalt Fischer-Tropsch synthesis catalyst and a preparation method thereof. technical background [0002] Fischer-Tropsch synthesis is a method for synthesizing liquid fuels from syngas discovered in the 1920s. Since the 1950s, large-scale industrial applications of coal-based synthetic fuels have been realized in South Africa. High-efficiency catalysts are the technological key to breakthroughs in this process. Iron, cobalt, and ruthenium are recognized as three types of Fischer-Tropsch active substances, among which ruthenium resources are scarce and do not meet the conditions for industrial application. Iron-based and cobalt-based catalysts are currently the two most widely studied catalyst systems for Fischer-Tropsch synthesis. Compared with cobalt, the chain growth ability of iron is relatively weak, which is suitable for products w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/888B01J37/02C10G2/00
Inventor 孙予罕任润厚李德宝郭金刚刘斌曹彦民孙志强贾丽涛郭荷芹
Owner 中科潞安能源技术有限公司
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