A preparation method of a catalyst for propane dehydrogenation to propylene and its catalyst

A propane dehydrogenation and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, hydrocarbons, etc., can solve the problems of complex preparation methods, weak interactions, short service life, etc., and achieve stability and selection Improve the performance, improve the dehydrogenation activity, and improve the interaction effect

Active Publication Date: 2019-02-19
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The mass ratio of Sn / Pt in the above catalysts is high (2-25), and Sn is prone to be reduced and precipitated during the high-temperature reaction, which affects the activity and selectivity of the catalyst, resulting in irreversible deactivation.
The Sn additive is impregnated on the surface of the support by conventional methods, and its direct interaction with the support is weak, and it is easy to be reduced to cause catalyst deactivation.
In addition, the preparation methods of the above-mentioned carriers are relatively complicated, and a carrier molding process in the later stage is required.
Although the propane dehydrogenation conversion rate and olefin selectivity are high under certain conditions, the catalyst is prone to carbon deposition and deactivation under high temperature conditions, resulting in poor reaction stability and short service life of the catalyst

Method used

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  • A preparation method of a catalyst for propane dehydrogenation to propylene and its catalyst
  • A preparation method of a catalyst for propane dehydrogenation to propylene and its catalyst
  • A preparation method of a catalyst for propane dehydrogenation to propylene and its catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Preparation of Sn-Al / Al by Impregnation Method2 o 3 carrier. Take 2ml Al(NO 3 ) 3 (0.05gAl / ml) solution and 2.44ml (0.025gSn / ml) SnCl 4 Put the dilute hydrochloric acid solution into a 200ml beaker, add 20ml deionized water, and mix well. Weigh 10 g of alumina A pellets and add to the above solution, let it stand for adsorption for 4 hours. Dry at 60°C for 4 hours, dry at 120°C for 4 hours, and calcinate at 550°C for 12 hours to obtain a catalyst carrier with dual promoters.

[0033] Take 10g of the above-mentioned carrier and put it into a 250ml suction filter bottle, and vacuumize for 0.5h. Add 1.35ml (0.037gPt / ml) of chloroplatinic acid solution and 2.4ml of 10% dilute hydrochloric acid. Dry at 60°C for 4 hours, dry at 120°C for 4 hours, and bake at 550°C for 4 hours.

[0034] Then the prepared catalyst was steam treated at 550°C for 4h; then impregnated with 5.6ml KNO 3 (0.025gK / ml) solution was introduced with alkali metal additives, the sample was dried at...

Embodiment 2

[0038] Preparation of Sn-Al / Al by Impregnation Method 2 o 3 carrier. Take 4.5ml Al(NO 3 ) 3 (0.05gAl / ml) solution and 2.44ml (0.025gSn / ml) SnCl 4 Put the dilute hydrochloric acid solution into a 200ml beaker, add 20ml deionized water, and mix well. Weigh 10 g of alumina A pellets and add to the above solution, let it stand for adsorption for 4 hours. Dry at 60°C for 4 hours, dry at 120°C for 4 hours, and calcinate at 550°C for 12 hours to obtain a catalyst carrier with dual promoters.

[0039] Take 10g of the above-mentioned carrier and put it into a 250ml suction filter bottle, and vacuumize for 0.5h. Add 1.35ml (0.037gPt / ml) of chloroplatinic acid solution and 2.4ml of 10% dilute hydrochloric acid. Dry at 60°C for 4 hours, dry at 120°C for 4 hours, and bake at 550°C for 4 hours.

[0040] Then the prepared catalyst was steam treated at 550°C for 4h; then impregnated with 5.6ml KNO 3 (0.025gK / ml) solution was introduced with alkali metal additives, the sample was drie...

Embodiment 3

[0044] Preparation of Sn-Al / Al by Impregnation Method 2 o 3 carrier. Take 9ml Al(NO 3 ) 3 (0.05gAl / ml) solution and 2.44ml (0.025gSn / ml) SnCl 4 Put the dilute hydrochloric acid solution into a 200ml beaker, add 20ml deionized water, and mix well. Weigh 10 g of alumina A pellets and add to the above solution, let it stand for adsorption for 4 hours. Dry at 60°C for 4 hours, dry at 120°C for 4 hours, and calcinate at 550°C for 12 hours to obtain a catalyst carrier with dual promoters.

[0045] Take 10g of the above-mentioned carrier and put it into a 250ml suction filter bottle, and vacuumize for 0.5h. Add 1.35ml (0.037gPt / ml) of chloroplatinic acid solution and 2.4ml of 10% dilute hydrochloric acid. Dry at 60°C for 4 hours, dry at 120°C for 4 hours, and bake at 550°C for 4 hours.

[0046] Then the prepared catalyst was steam treated at 550°C for 4h; then impregnated with 5.6ml KNO 3 (0.025gK / ml) solution was introduced with alkali metal additives, the sample was dried ...

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Abstract

The invention relates to a preparation method of a catalyst for propane dehydrogenation to propylene, which uses a bimetallic metal combined with a group IV element metal and a group III element metal as an auxiliary agent, and uses a platinum group element metal as an active group for dehydrogenation of the catalyst points, with shaped alumina as the carrier. The preparation process of the catalyst includes: introducing the Sn-Al additive into the alumina support by the co-impregnation method, so that Sn can be more uniformly dispersed in the support at the atomic level, and at the same time strengthen the interaction between Sn and the alumina support; The dehydrogenation active component is impregnated on the Sn-Al alumina carrier to improve the interaction force between the metal-auxiliary-support; finally, it is dried and roasted, dechlorinated, impregnated with alkali metal auxiliaries, impregnated with dilute hydrochloric acid and vulcanized, etc. The treatment finally yields a dehydrogenation catalyst. The catalyst of the invention can be used for the dehydrogenation reaction of low-carbon alkanes, especially the dehydrogenation reaction of propane, and has the advantages of high activity, good selectivity, good catalyst stability, etc., especially the obvious improvement of selectivity and stability.

Description

technical field [0001] The invention relates to a catalyst for propane dehydrogenation containing Sn, Al bimetallic promoters and alumina as a carrier and a preparation method thereof, especially a catalyst for improving the reaction activity, selectivity and stability of a catalyst for propane dehydrogenation to propylene The preparation method belongs to the catalyst preparation technology in the technical field of industrial catalysis. Background technique [0002] As an important organic chemical raw material, propylene can be used in large quantities in the production of acrylonitrile, propylene oxide, butanol, octanol, isopropanol, cumene, acrylic acid and nonylphenol in addition to the production of polypropylene. product. Propylene mainly comes from by-products or co-productions such as naphtha cracking and refinery FCC processes, accounting for about 90% of propylene sources. Since the 1990s, with the gradual increase in the consumption of propylene, the tradition...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/045C07C11/06C07C5/333
CPCY02P20/52
Inventor 徐竹生田志坚王冬娥马怀军潘振栋曲炜李鹏王从新
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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