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Alkane dehydrogenation catalyst and preparation method thereof

A technology of alkane dehydrogenation and catalyst, which is applied in the direction of catalysts, carbon compound catalysts, chemical instruments and methods, etc. It can solve the problems of low conversion rate, short life, poor stability of low carbon chains, etc., and achieve reduced carbon deposition and high stability , the effect of improving stability

Inactive Publication Date: 2018-07-20
REZEL CATALYSTS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technology provided by US4608360 patent The specific surface area of ​​alumina carrier is 5~150m 2 / g, the proportion of pores with an average pore diameter of 30nm is less than 18% of the total pore volume, and the proportion of pores with an average pore diameter of 60nm or above accounts for more than 55% of the total pore volume. poor performance and short lifespan
[0006] The application number is CN971044627, which is an invention of a saturated hydrocarbon dehydrogenation catalyst and its preparation method, which discloses the scheme of adopting double hole distribution, wherein 5-100nm accounts for 20-35%, and 100-1000nm accounts for 44-58%. Carbon paraffin dehydrogenation reaction, when used for dehydrogenation of low carbon paraffins, the conversion rate is relatively low

Method used

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  • Alkane dehydrogenation catalyst and preparation method thereof

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Effect test

Embodiment 1

[0029] Carrier preparation: mix 50g of sieved 70-120μm pseudo-boehmite raw powder with 62g of 5% dilute hydrochloric acid solution in a tank at 70°C to form a sol, and shape it in an oil ammonia column to obtain pellets , dried at 120°C, then roasted at 900°C for 4 hours, sieved after cooling The small ball, namely the carrier A1.

[0030] Catalyst preparation: Take 20 g of the A1 alumina support pellets prepared above and place them in an impregnator. Take 4ml of chloroplatinic acid aqueous solution containing platinum 0.01g / ml, 3.25ml of tin protochloride aqueous solution containing 0.005g / ml of tin, 0.53ml of potassium nitrate solution containing 0.01g / ml of potassium, add 0.33g of 2-propenyl acrylic acid , and then add 8.27g of deionized water to prepare an impregnating solution, and impregnate the alumina carrier at 60°C for 2h. Then dry at 100°C for 2h, and bake at 550°C for 4h to obtain catalyst A2

Embodiment 2

[0032] Carrier preparation: Mix 38g of 70-120μm γ-alumina raw powder sieved with 50g of 5% dilute hydrochloric acid solution in a tank at 60°C to form a sol, and shape it in an oil ammonia column to obtain pellets. Dry at 140°C, then bake at 1000°C for 6 hours, sieve after cooling The pellets are obtained as carrier B1.

[0033] Catalyst preparation: Take 20 g of the carrier B1 alumina pellets prepared above and put them in an impregnator. Get 6ml of chloroplatinic acid aqueous solution containing platinum 0.01g / ml, 5.00ml of tin protochloride aqueous solution containing 0.005g / ml of tin, 0.80ml of potassium nitrate solution containing potassium 0.01g / ml, add 0.48g of pyruvic acid, and then add 4.20 g of deionized water was prepared as an impregnation solution, and the alumina carrier was impregnated at 40° C. for 2 hours. Then it was dried at 80°C for 2 hours and calcined at 600°C for 6 hours to obtain catalyst B2.

Embodiment 3

[0035] Carrier preparation: Mix 52g of 70-120μm diaspore raw powder and 67g of 5% dilute hydrochloric acid solution in a tank at 80°C to form a sol, and shape it in an oil ammonia column to obtain pellets , dried at 130°C, then calcined at 1100°C for 5h, cooled and sieved The pellets are the carrier C1.

[0036] Catalyst preparation: Take 20 g of the carrier C1 alumina pellets prepared above and place them in an impregnator. Get 6ml of chloroplatinic acid aqueous solution containing platinum 0.01g / ml, 5.20ml of tin protochloride aqueous solution containing 0.005g / ml tin, 1.00ml of potassium nitrate solution containing potassium 0.01g / ml, add 0.62g butanonic acid, and then Add 4.79 g of deionized water to prepare an impregnating solution, and impregnate the alumina carrier at 50° C. for 3 hours. Then, it was dried at 80°C for 3 hours and calcined at 500°C for 8 hours to obtain catalyst C2.

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Abstract

The invention relates to an alkane dehydrogenation catalyst, which is prepared from a carrier, and Pt, Sn and K elements loaded on the carrier, wherein micropores, with the pore diameter being 2 to 15nm, of the carrier accounts for 5 to 30 percent, and the micropores with the pore diameter being 15 to 85nm accounts for 55 to 85 percent. Aluminum oxide with specific pore diameter distribution is used as the carrier; through the specific pore diameter distribution, the fast diffusion of reaction products is facilitated; the contact time of an intermediate product and a metal active site is reduced; the generation of carbon deposition is obviously reduced.

Description

technical field [0001] The invention belongs to the field of dehydrogenation catalysts, in particular to an 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 equilibrium, ha...

Claims

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Application Information

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IPC IPC(8): B01J23/62B01J35/10C07C5/333C07C11/06C07C11/08
CPCC07C5/3332B01J23/002B01J23/626C07C2523/62B01J2523/00B01J35/647B01J35/651B01J2523/13B01J2523/31B01J2523/43B01J2523/828C07C11/06C07C11/08Y02P20/52
Inventor 卓润生钱颖梁衡赵磊
Owner REZEL CATALYSTS CO LTD
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