A kind of low-carbon alkane dehydrogenation catalyst and preparation method thereof

A technology for dehydrogenation catalysts and low-carbon alkanes, applied in the direction of carbon compound catalysts, catalysts, hydrocarbons, etc., to achieve the effect of increasing active sites, promoting uniform dispersion and reducing deactivation rate

Active Publication Date: 2020-09-08
REZEL CATALYSTS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Catalysts for dehydrogenation of low-carbon alkanes have made great progress, but there are still problems including stability

Method used

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  • A kind of low-carbon alkane dehydrogenation catalyst and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0031] Weigh 1.0g SnCl 2 Dissolve in 5ml hydrochloric acid, add 0.6g CeCl under stirring 3 , stirred for 30 minutes to make the solution uniform, and then slowly added dropwise ammonia water until the pH was 8, while stirring. After the dropwise addition of ammonia water, stirred for 30 minutes, then stood still for 30 minutes. The precipitate was filtered, dried at 120°C for 2 hours, calcined at 550°C for 3 hours, and then the obtained solid solution was ground into a fine powder below 40 μm. Weigh 30.0g of pseudo-boehmite and pour it into 30.0g of deionized water and stir, then add Sn-Ce-O solid solution fine powder and stir, slowly add 5.8g of hydrochloric acid solution dropwise to make the solution into a sol state, prepared by the oil ammonia column method spherical shape, then dried at 100°C for 3h, and then calcined at 600°C for 4h to prepare a composite alumina carrier containing Sn-Ce-O solid solution. Dissolve 0.3g of chloroplatinic acid in 10g of dilute hydrochlor...

Embodiment 2

[0033] Weigh 1.2g SnCl 2 Dissolve in 5ml hydrochloric acid, add 0.4g TiCl under stirring 4 , stirred for 60 minutes to make the solution uniform, and then slowly added dropwise ammonia water until the pH was 7.0 while stirring. The precipitate was filtered, dried at 100°C for 2 hours, calcined at 620°C for 3 hours, and then the obtained solid solution was ground into a fine powder below 40 μm. Weigh 32.0g of aluminum hydroxide, add Sn-Ti-O solid solution fine powder, pour into 15.0g of deionized water and knead, use extruder to make strips, then dry at 130°C for 3h, and roast at 700°C for 4h to prepare Sn-Ti-containing Composite alumina support for -O solid solution. Dissolve 1.2g of chloroplatinic acid and 0.5g of KCl in 10g of dilute hydrochloric acid, add a composite alumina carrier containing Sn-Ti-O solid solution under stirring, mix well, then dry at 120°C for 2h, and roast at 750°C for 2h to obtain low-carbon Alkane dehydrogenation catalyst B. Evaluation conditions ...

Embodiment 3

[0035] Weigh 0.8g SnCl 2 Dissolve in 5ml hydrochloric acid, add 0.6g FeCl under stirring 3 , stirred for 60 minutes to make the solution uniform, and then slowly added dropwise ammonia water until the pH was 7.0 while stirring. The precipitate was filtered, dried at 100°C for 2 hours, calcined at 620°C for 3 hours, and then the obtained solid solution was ground into a fine powder below 40 μm. Weigh 35.0g macroporous pseudo-boehmite, add Sn-Fe-O solid solution fine powder, pour 15.0g deionized water and knead, use extruder to make strips, then dry at 130°C for 3h, and roast at 700°C for 4h to prepare Composite alumina support containing Sn-Fe-O solid solution. Dissolve 0.08g of chloroplatinic acid and 0.5g of KCl in 10g of dilute hydrochloric acid, add a composite alumina carrier containing Sn-Fe-O solid solution under stirring, mix well, then dry at 150°C for 8h, and roast at 750°C for 2h to obtain low-carbon Alkane dehydrogenation catalyst C. Evaluation conditions are th...

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Abstract

The invention provides a low-carbon alkane dehydrogenation catalyst. The catalyst is prepared from a platinum component and an alkali metal component, wherein an aluminum oxide based carrier containing an Sn-M-O solid solution is adopted; based on platinum oxide and based on alkali metal oxide, the catalyst comprises the following components in parts by weight: 0.1 to 2 parts of the platinum oxide, 0.1 to 5 parts of the alkali metal oxide, 90 to 99 parts of aluminum oxide and 0.1 to 8 parts of the Sn-M-O solid solution; M is selected from one or more metal elements in fourth, fifth, sixth andseventh periods of a periodic table of elements. According to the low-carbon alkane dehydrogenation catalyst provided by the invention, Sn and M elements in the prepared solid solution have a synergistic effect, so that the acidity of the catalyst is easy to reduce, the catalyst is rapidly dispersed from an intermediate product, and the selectivity of the catalyst is improved; meanwhile, uniform dispersion of Pt is promoted, active sites are increased, and the conversion rate is improved.

Description

technical field [0001] The invention belongs to the field of dehydrogenation catalysts, in particular to a low-carbon alkane dehydrogenation catalyst and a preparation method thereof. Background technique [0002] Propylene and isobutylene are important chemical raw materials. Propylene is mainly used to produce polypropylene, acrylonitrile, acrylic acid, acrolein, etc., and is the basic raw material for the three major synthetic materials (plastic, rubber and fiber). Isobutene is used to produce methyl tert-butyl ether, tert-butanol, methyl methacrylate and butyl rubber, etc., and is also used as a raw material for alkylation of low-carbon olefins. The effective use of propane and isobutane is not only in line with the national low-carbon environmental protection policy and the concept of circular economy, but also has good economic and social benefits. [0003] Catalytic dehydrogenation of low-carbon alkanes is a strong endothermic reaction, limited by thermodynamic equil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/62B01J23/63B01J23/656B01J23/89C07C5/333C07C11/06C07C11/09B01J27/135
CPCB01J23/002B01J23/626B01J23/63B01J23/6562B01J23/8966B01J27/135C07C5/3337C07C2523/62C07C2523/63C07C2523/656C07C2523/89C07C11/06C07C11/09Y02P20/52
Inventor 卓润生钱颖梁衡赵磊
Owner REZEL CATALYSTS CORP
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