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Pt-based catalyst for dehydrogenation of isobutane by using carrier Sn-containing mesoporous carbon, preparation method and application thereof

A technology of mesoporous carbon and isobutane, which is applied in the direction of hydrocarbons, metal/metal oxides/metal hydroxide catalysts, hydrocarbons, etc., can solve the problems of high catalyst preparation cost, poor reactivity, poor stability, etc. problem, achieve good industrial application prospect and low preparation cost

Active Publication Date: 2017-01-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the catalyst still has defects such as high preparation cost, poor reactivity, and poor stability, and so far, the preparation of a Pt-based catalyst for isobutane dehydrogenation using Sn-containing mesoporous carbon as a carrier has not been reported.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Preparation of Sn-containing mesoporous carbon carrier: Dissolve 5 g of template agent F127 in 80 g of ethanol solution to form a transparent solution, then slowly add 125 g of ethanol solution of 25 g of phenolic resin and 0.12 g of tin tetrachloride into the transparent solution and mix evenly, 25 After the solvent was evaporated at ℃ for 12 hours, it was polymerized under microwave conditions for 20 minutes, and the polymer was carbonized at 700 ℃ for 2 hours in a nitrogen atmosphere to obtain 10.9 g of mesoporous carbon supports with a Sn content of 0.5%. The BET ratio of the prepared Sn-containing mesoporous carbon was Surface area 618m 2 / g, pore volume 0.51cm 3 / g, the pore diameter is 2.5nm, and the mesoporosity is 72%.

[0028] Preparation of Pt-based catalyst: Dissolve 0.07g of chloroplatinic acid in 10mL of ethanol, then add 5g of the above-prepared Sn-containing mesoporous carbon carrier into the solution, stir and dry at 70°C, and roast at 480°C for 3h und...

Embodiment 2

[0035] Preparation of Sn-containing mesoporous carbon carrier: Now add 6.25g sucrose and 4mL concentrated sulfuric acid to 25mL distilled water to form a solution. The solution is suction-filtered through the filter layer of 5g template agent SBA-15, and the suction filtration is repeated 3 times. Dry at 100°C, and then preliminarily carbonize at 150°C for 6 hours. Then use 4g of sucrose, 0.79g of stannous sulfate, 2.5mL of concentrated sulfuric acid and 40mL of distilled water to make a solution, and use the above method for secondary filtration, drying and preliminary carbonization. The obtained sample was calcined at 800°C under a nitrogen atmosphere for 4 hours. Remember that the mesoporous carbon with a Sn content of 6% was 7.3g, and the BET specific surface area of ​​the prepared Sn-containing mesoporous carbon was 1930m 2 / g, pore volume 3.42cm 3 / g, the pore diameter is 7.3nm, and the mesoporosity is 87.6%.

[0036] Preparation of Pt-based catalyst: Dissolve 0.56g of...

Embodiment 3

[0043] Preparation of Sn-containing mesoporous carbon carrier: Dissolve 10 g of sucrose and 0.44 g of tin tetrachloride in 30 mL of ethanol, add nano-calcium carbonate, stir until the mixture produces bubbles, and after the bubbles disappear, bake at 700 ° C for 4 h under nitrogen atmosphere, cool, Filter, wash and dry to obtain a mesoporous carbon carrier with a Sn content of 3%. The BET specific surface area of ​​the prepared Sn-containing mesoporous carbon is 1161m 2 / g, pore volume 2.73cm 3 / g, the pore diameter is 5.2nm, and the mesoporosity is 81.3%.

[0044] Preparation of Pt-based catalyst: Dissolve 0.28g of chloroplatinic acid in 10mL of ethanol, then add 5g of the above-prepared Sn-containing mesoporous carbon carrier into the solution, stir and dry at 70°C, and roast at 520°C for 5h under a nitrogen atmosphere to obtain Catalyst with 2% Pt content.

[0045] Evaluation of Pt-based catalysts: The prepared catalysts were packed in a fixed-bed reactor, under normal pr...

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Abstract

The invention discloses a Pt-based catalyst for dehydrogenation of isobutane by using a carrier Sn-containing mesoporous carbon. The weight of an active component Pt which is metered based on a simple substance is 0.5-4% of the weight of the carrier, and the weight of Sn which is metered based on a simple substance is 0.5-6% of the weight of the carrier. After 20 hours of reactions of the Pt-based catalyst for dehydrogenation of isobutane by using the carrier Sn-containing mesoporous carbon, conversion rate of the catalyst isobutane reaches 38.6%, corresponding selectivity of isobutene reaches 94.3%, activity is decreased by 3.2%, and the catalyst has low preparation cost and good industrial application prospects.

Description

technical field [0001] The invention relates to a Pt-based catalyst for isobutane dehydrogenation with Sn-containing mesoporous carbon as a carrier, a preparation method and application thereof, and belongs to the field of catalyst preparation. Background technique [0002] Isobutene is a very important organic chemical raw material, mainly used for the preparation of methyl tert-butyl ether, butyl rubber and polyisobutylene, and can also be used for the synthesis of methacrylate, isoprene, tert-butylphenol, tert-butylamine, 1 , Various organic raw materials and fine chemicals such as 4-butanediol and ABS resin. In recent years, with the rapid development of the isobutene downstream product market, the output of isobutene produced by traditional steam cracking and catalytic cracking has been difficult to meet its demand. Dehydrogenation of isobutane to isobutene is the main method to solve the shortage of isobutene. This process already has an industrialized catalyst abroa...

Claims

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Application Information

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IPC IPC(8): B01J21/18B01J23/42B01J23/14B01J35/10C07C5/333C07C11/09
Inventor 李泽壮刘经伟陈韶辉杨爱武柏基业刘丽娟王英武
Owner CHINA PETROLEUM & CHEM CORP
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