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Catalyst and method for propane dehydrogenation in the presence of carbon dioxide mild oxidant

A technology for dehydrogenation catalysts and carbon dioxide, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as high reaction temperature and low catalyst activity

Active Publication Date: 2019-09-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is high reaction temperature and low catalyst activity in the prior art, and a catalyst and method thereof for propane dehydrogenation in the presence of a mild oxidant are provided

Method used

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  • Catalyst and method for propane dehydrogenation in the presence of carbon dioxide mild oxidant
  • Catalyst and method for propane dehydrogenation in the presence of carbon dioxide mild oxidant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh 84.21 grams of Cr(NO 3 ) 3 9H 2 O, 615.38 grams of Zr(NO 3 ) 4 ·5H 2 O, 25.0 g Ce(NO 3 ) 3 ·6H 2 O was added to 500 ml of deionized water, stirred, and dissolved completely. Under stirring, add 6 mol / L ammonia water dropwise to the above mixed solution, control the pH throughout the process to be above 10, and continue stirring for 1 hour after the dropwise addition. The resulting precipitate was aged for 24 hours. After aging, it was filtered and washed, dried at 120°C for 12 hours, and then calcined in a muffle furnace at 600°C for 4 hours. The desired propane dehydrogenation catalyst is obtained.

[0027] The catalyst was crushed and sieved, and 40-60 meshes were taken, and activated by nitrogen gas at 560° C. for 2 hours in a fixed-bed reactor. After cooling down, at a reaction temperature of 550°C, C 3 h 8 :CO 2 =1:2, under the reaction conditions of a total gas flow rate of 50mL / min, the single-pass conversion of propane dehydrogenation is 58.5...

Embodiment 2

[0029] Weigh 315.78 grams of Cr(NO 3 ) 3 9H 2 O, 419.58 grams of Zr(NO 3 ) 4 ·5H 2 O, 62.5 g Ce(NO 3 ) 3 ·6H 2 O was added to 500 ml of deionized water, stirred, and dissolved completely. The rest of the preparation method and evaluation conditions are the same as in Example 1, the single-pass conversion rate of propane dehydrogenation is 58.6%, and the selectivity of propylene is 91.6%.

Embodiment 3

[0031] Weigh 84.21 grams of Cr(NO 3 ) 3 9H 2 O, 706.91 grams of Zr(NO 3 ) 4 ·5H 2 O, 0.625 g Ce(NO 3 ) 3 ·6H 2 O was added to 500 ml of deionized water, stirred, and dissolved completely. The rest of the preparation method and evaluation conditions are the same as in Example 1, the single-pass conversion rate of propane dehydrogenation is 56.2%, and the selectivity of propylene is 90.6%.

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Abstract

The invention relates to a method for dehydrogenation of propane in the presence of a carbon-dioxide mild oxidant, and mainly solves the problems of high reaction temperature and low catalyst activityin the prior art. According to the invention, a technical scheme of using a propane dehydrogenation catalyst is adopted to solve the problems well, wherein the catalyst comprises the following components in parts by weight: (a) 0.1-30.0 parts of an active component in terms of Cr2O3, (b) 0.1-10.0 parts of a rare earth oxide modifier, and (c) 60.0-99.5 parts of a catalyst carrier ZrO2, so that thecatalyst can be used in the industrial production of propane dehydrogenation.

Description

technical field [0001] The invention relates to a propane dehydrogenation catalyst in the presence of a carbon dioxide mild oxidant and a method thereof. Background technique [0002] Low-carbon olefins usually refer to olefins with less than or equal to 4 carbon atoms, which are very important organic chemical raw materials, especially ethylene, propylene, butylene, etc. Propylene, acrylonitrile, ethylene oxide, propylene oxide, butanol, cumene, etc. Among them, the amount of propylene is second only to ethylene, etc. In recent years, the global propylene consumption has grown at an average annual rate of 4.8%, exceeding the growth rate of propylene production in the same period. my country's demand for propylene is quite large, and it has long relied on imports. It is predicted that during the 12th Five-Year Plan period, my country will need to import 5 million tons of propylene every year. The production of low-carbon olefins mainly adopts ethylene co-production and cat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/26B01J23/28C07C5/333C07C11/06
Inventor 缪长喜危春玲刘剑锋
Owner CHINA PETROLEUM & CHEM CORP