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Catalyst for preparing olefin by dehydrogenation of low-carbon alkane and preparation and application thereof

A technology for the dehydrogenation of low-carbon alkanes and alkanes, which is applied to catalysts for dehydrogenation of low-carbon alkanes to olefins and its preparation, catalyst preparation for yield and stability, catalyst preparation, and improvement of the conversion rate of low-carbon alkane dehydrogenation to olefins It can solve problems such as side reactions, catalyst deactivation, surface area carbon, etc., and achieve the effect of improving stability and olefin yield

Pending Publication Date: 2022-06-07
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are a small amount of medium-strong acid centers on the surface of alumina, so the dehydrogenation process is often accompanied by side reactions, resulting in carbon on the surface, which seriously deactivates the catalyst.

Method used

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  • Catalyst for preparing olefin by dehydrogenation of low-carbon alkane and preparation and application thereof
  • Catalyst for preparing olefin by dehydrogenation of low-carbon alkane and preparation and application thereof
  • Catalyst for preparing olefin by dehydrogenation of low-carbon alkane and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Preparation of Sn-Zn / ZnAl by Impregnation Method 2 O 4 vector. Take 2ml Zn(NO 3 ) 2 (0.05g Zn / ml) solution and 2.44ml (0.025gSn / ml) SnCl 4 The mass concentration of 10% dilute hydrochloric acid solution is put into a 200ml beaker, 4ml of deionized water is added, and the mixture is evenly mixed. 10 g of zinc-aluminum spinel pellets were weighed and added to the above solution, and placed for adsorption for 4 h. Drying at 60°C for 4h, drying at 120°C for 4h, and calcining at 550°C for 12h to obtain a catalyst carrier with dual promoters.

[0033] Take 10g of the above carrier and put it into a 250ml suction filter bottle and vacuumize for 0.5h. 1.35ml (0.037gPt / ml) of chloroplatinic acid solution and 2.4ml of 10% mass concentration of dilute hydrochloric acid were added. Drying at 60°C for 4h, drying at 120°C for 4h, and calcining at 550°C for 4h.

[0034] The prepared catalyst was then subjected to steam treatment at 550 °C for 4 h; then 5.6 ml of KNO was impreg...

Embodiment 2

[0038] Preparation of Sn-Zn / ZnFe by Impregnation Method 2 O 4 vector. Take 4.5ml ZnCl 2 (0.05g Zn / ml) solution and 2.44ml (0.025gSn / ml) SnCl 4 Put the diluted hydrochloric acid solution into a 200ml beaker, add 2ml deionized water, and mix well. 10 g of zinc-iron spinel particles were weighed and added to the above solution, and placed for adsorption for 4 h. Drying at 60°C for 4h, drying at 120°C for 4h, and calcining at 550°C for 12h to obtain a catalyst carrier with dual promoters.

[0039] Take 10g of the above carrier and put it into a 250ml suction filter bottle and vacuumize for 0.5h. 1.35 ml (0.037 gPt / ml) of chloroplatinic acid solution and 2.4 ml of 10% dilute hydrochloric acid were added. Drying at 60°C for 4h, drying at 120°C for 4h, and calcining at 550°C for 4h.

[0040] The prepared catalyst was then subjected to steam treatment at 550 °C for 4 h; then 5.6 ml of KNO was impregnated 3 (0.025gK / ml) solution was introduced into alkali metal additives, and t...

Embodiment 3

[0044] Preparation of Sn-Zn / ZnCr by Impregnation Method 2 O 4 vector. Take 9ml Zn(CH 3 COO) 2 (0.05gZn / ml) solution and 2.44ml (0.025gSn / ml) SnCl 4 The diluted hydrochloric acid solution was put into a 200ml beaker and mixed well. Weigh 10 g of zinc-chromium spinel powder into the above solution, and place it for adsorption for 4 h. Drying at 60°C for 4h, drying at 120°C for 4h, and calcining at 550°C for 12h to obtain a catalyst carrier with dual promoters.

[0045] Take 10g of the above carrier and put it into a 250ml suction filter bottle and vacuumize for 0.5h. 1.35 ml (0.037 gPt / ml) of chloroplatinic acid solution and 2.4 ml of 10% dilute hydrochloric acid were added. Drying at 60°C for 4h, drying at 120°C for 4h, and calcining at 550°C for 4h.

[0046] The prepared catalyst was then subjected to steam treatment at 550 °C for 4 h; then 5.6 ml of KNO was impregnated 3 (0.025gK / ml) solution was introduced into alkali metal additives, and the sample was dried at 120...

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PUM

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Abstract

The invention relates to a preparation method of a catalyst for preparing olefin by dehydrogenation of low-carbon alkane, which takes bimetal combined by group IV element metal and transition metal as an auxiliary agent, platinum group element metal as an active component for dehydrogenation of the catalyst, and transition metal spinel as a carrier. The preparation process of the catalyst comprises the following steps: introducing group IV element metal and a transition metal additive into a transition metal spinel carrier by adopting a co-impregnation method, so that group IV element metal atoms are more uniformly dispersed in the carrier at the atomic level, and meanwhile, the acting force between the group IV element metal atoms and the transition metal spinel carrier is enhanced; then dipping a dehydrogenation active component on a transition metal spinel carrier containing group IV element metal and a transition metal auxiliary agent, so as to improve the interaction force among the metal, the auxiliary agent and the carrier; and finally, drying, roasting, dechlorinating, dipping in an alkali metal additive, dipping in diluted hydrochloric acid, vulcanizing and the like to obtain the dehydrogenation catalyst. The catalyst provided by the invention has the advantages of high conversion rate, high olefin yield, good catalyst stability and the like.

Description

technical field [0001] The present invention relates to a catalyst for dehydrogenation of low-carbon alkanes to olefins and a preparation method thereof, and a catalyst for producing olefins by dehydrogenation of low-carbon alkanes, and a preparation method thereof, in particular to improve the production of low-carbon alkanes. The invention discloses a catalyst preparation method for the conversion rate, yield and stability of dehydrogenation to olefin reaction, belonging to the catalyst preparation technology in the technical field of industrial catalysis. Background technique [0002] Low-carbon olefins are important petrochemical raw materials, mainly from the cracking of naphtha to produce ethylene, and C3-C4 olefins are its by-products. In recent years, the demand for light olefins has been increasing. As the price of naphtha has risen, people have begun to seek cheaper feedstocks to produce light olefins. At present, most of the low-carbon and low-carbon alkanes in ...

Claims

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Application Information

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IPC IPC(8): B01J23/62B01J23/89B01J23/652B01J23/656C07C11/09C07C5/42
CPCB01J23/626B01J23/8966B01J23/6522B01J23/6562C07C5/42C07C11/09Y02P20/52
Inventor 王冬娥田志坚王琳李鹏王从新曲炜马怀军潘振栋王帅旗
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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