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Catalyst for preparation of propylene by propane dehydrogenation and preparing method thereof

A propane dehydrogenation and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of catalyst deactivation, high reaction temperature, low conversion rate, etc. effect, high propane conversion, excellent performance

Inactive Publication Date: 2015-09-09
王敏
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Excessively high reaction temperature will aggravate the propane cracking reaction and deep dehydrogenation, and reduce the selectivity; at the same time, it will accelerate the surface carbon of the catalyst, causing the catalyst to deactivate rapidly. Propane dehydrogenation to propylene has limited industrial application
[0004] The key to realizing propane dehydrogenation to propylene technology is to develop a propane dehydrogenation catalyst with high stability, high activity and high selectivity. The dehydrogenation catalyst currently developed is mainly based on γ-Al 2 o 3 As a carrier, it is prepared by loading platinum group metal active components and adding various metal promoters. Although these catalysts have high alkane conversion and olefin selectivity under certain reaction conditions, due to high temperature conditions The catalyst is prone to carbon deposition and deactivation, resulting in poor stability of the catalytic reaction and a short service life of the catalyst

Method used

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  • Catalyst for preparation of propylene by propane dehydrogenation and preparing method thereof
  • Catalyst for preparation of propylene by propane dehydrogenation and preparing method thereof
  • Catalyst for preparation of propylene by propane dehydrogenation and preparing method thereof

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Embodiment 1

[0026] A catalyst for propane dehydrogenation to propylene, comprising the following components: alumina, magnesia composite oxide carrier 80wt%, wherein the molar ratio of alumina to magnesia is 1, platinum 3.1wt%, cesium 5.0wt%, scandium 2.5wt%, chlorine 9.4wt%, and the molar ratio of scandium to platinum is 3.5.

[0027] The preparation method of above-mentioned catalyst comprises the steps:

[0028] 1) Weigh 110g Al(NO 3 ) 3 9H 2 O and 29.6g Mg(NO 3 ) 2 Dissolve in 1200mL deionized water to make a total concentration of 0.5mol L -1 Mixed salt solution, weigh 80g NaOH and dissolve in 400ml deionized water to prepare 5mol L -1 Add the NaOH solution drop by drop to the mixed salt solution under stirring conditions, keep the pH value of the system at 9-10 during the dropwise addition, continue stirring and aging for 3 hours after the NaOH solution is added dropwise, and the obtained product Filter, wash with deionized water repeatedly 3 times, place in a constant temper...

Embodiment 2

[0032] A catalyst for propane dehydrogenation to propylene, comprising the following components: alumina, magnesia composite oxide carrier 95wt%, wherein the molar ratio of alumina to magnesia is 1.5, platinum 0.5wt%, cesium 3wt%, yttrium 0.5 wt%, bromine 1wt%, the molar ratio of yttrium to platinum is 2.2.

[0033] The preparation method of above-mentioned catalyst comprises the steps:

[0034] 1) Weigh 132g Al(NO 3 ) 3 9H 2 O and 17.8g Mg(NO 3 ) 2 Dissolve in 1200mL deionized water to make a total concentration of 0.5mol L -1 Mixed salt solution, weigh 80g NaOH and dissolve in 400ml deionized water to prepare 10mol L-1 NaOH solution, add NaOH solution dropwise to the mixed salt solution under stirring condition, keep the pH of the system during the dropping process The value is between 9 and 10. After the NaOH solution is added dropwise, continue to stir and age for 2 hours. Filter the obtained product, wash it repeatedly with deionized water for 3 times, and dry it in...

Embodiment 3

[0038] A catalyst for propane dehydrogenation to propylene, comprising the following components: alumina, magnesia composite oxide carrier 85wt%, wherein the molar ratio of alumina to magnesia is 2, platinum 5wt%, cesium 0.1wt%, scandium 5wt% %, iodine 4.4wt%, and the molar ratio of scandium to platinum is 3.5.

[0039] The preparation method of above-mentioned catalyst comprises the steps:

[0040] 1) Weigh 63.6g AlCl 3 and 24.4g MgCl 2 ·6H 2 O was dissolved in 1200 mL of deionized water to make a total concentration of 0.5 mol L -1 Mixed salt solution, weigh 80g NaOH and dissolve in 400ml deionized water to prepare 5mol L -1 Add the NaOH solution drop by drop to the mixed salt solution under stirring conditions, keep the pH value of the system at 9-10 during the dropwise addition, continue to stir and age for 5 hours after the NaOH solution is added dropwise, and the obtained product Filter, wash with deionized water repeatedly 3 times, place in a constant temperature d...

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Abstract

The invention relates to catalyst for preparation of propylene by propane dehydrogenation and a preparing method thereof. The catalyst comprises 75wt% to 95wt% of aluminum oxide and magnesium oxide composite oxide support, 0.5wt% to 10wt% of platinum group metal, 0.1wt% to 5wt% of cesium, 0.5wt% to 5wt% of scandium or yttrium, and 0.1wt% to 10wt% of halogen. The molar ratio of the aluminum oxide to the magnesium oxide is 1 to 2; the molar ratio of the scandium or yttrium to the platinum group metal is 1.3 to 3.5. The catalyst prepared by propane dehydrogenation using the aluminum oxide and magnesium oxide composite oxide as a support has high propane conversion rate, propane selectivity and reaction stability under high temperature and low pressure and has excellent performances.

Description

technical field [0001] The invention relates to a catalyst, in particular to a catalyst for producing propylene from propane dehydrogenation and a preparation method thereof, belonging to the technical field of industrial catalysis. Background technique [0002] Propylene is an important organic chemical raw material, which is widely used in the preparation of polymer materials such as polypropylene and polyacrylonitrile. At present, the growth rate of my country's demand for propylene has exceeded that of ethylene. At the same time, my country's propane gas resources are abundant. It is used as civil fuel, so it is of great research significance to produce high-value-added propylene that is in short supply in the market through dehydrogenation catalytic reaction of large amount and cheap propane. [0003] The catalytic reaction of propane dehydrogenation is limited by thermodynamic equilibrium and must be carried out under the conditions of high temperature and low pressure....

Claims

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Application Information

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IPC IPC(8): B01J27/138
Inventor 张莹王敏
Owner 王敏
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