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Propane dehydrogenation catalyst and preparation method thereof, and method for preparing propylene by propane dehydrogenation

A propane dehydrogenation and catalyst technology, which is applied in the direction of chemical instruments and methods, physical/chemical process catalysts, hydrocarbons, etc., can solve the problems of unfavorable large-scale production, prone to mistakes or errors, etc., and achieve a favorable ecological environment protection, easy operation, and high propane conversion

Inactive Publication Date: 2019-06-25
高化学(江苏)化工新材料有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The technical solution disclosed still uses metal additives, but its preparation method requires fine-grained operations, which is prone to mistakes or errors, which is not conducive to large-scale production

Method used

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  • Propane dehydrogenation catalyst and preparation method thereof, and method for preparing propylene by propane dehydrogenation
  • Propane dehydrogenation catalyst and preparation method thereof, and method for preparing propylene by propane dehydrogenation
  • Propane dehydrogenation catalyst and preparation method thereof, and method for preparing propylene by propane dehydrogenation

Examples

Experimental program
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Effect test

Embodiment 1

[0038] 1) Pre-carbonize 10 g of dried waste tea leaves in a nitrogen atmosphere at 400° C. for 2 hours, and cool naturally to room temperature;

[0039] 2) Pulverize the pre-carbonized sample, mix it with sodium hydroxide solution, the mass ratio of sample to sodium hydroxide is 1:1, and evaporate the solution to dryness after stirring for 1 hour;

[0040] 3) Activate the obtained product at 700°C under nitrogen for 1 hour, wash until neutral, and dry to obtain a biomass carbon material with a specific surface of 1025m 2 g -1 , the pore volume is 0.75cc / g.

[0041] Evaluation conditions: the amount of catalyst is 0.2g, the mass space velocity of propane is 3000h -1 , the reaction pressure is normal pressure. The temperature of the reaction stability test of the catalyst is 600°C.

[0042] The results show that the initial propane conversion rate of the biomass carbon material catalyst synthesized by the present invention is 65.5%, and the propylene selectivity is 92.2%. Af...

Embodiment 2

[0044] Steps 1) and 2) are the same as in Example 1, the activation temperature in step 3) is increased to 800° C., and other reaction conditions remain unchanged. The obtained biomass carbon material surface is 1058m 2 g -1 , the pore volume is 1.65cc / g.

[0045] The evaluation conditions are the same as in Example 1, and the results show that the initial propane conversion rate of the biomass carbon material catalyst synthesized by the present invention is 39.8%, and the selectivity of propylene is 87.5%. After 50 hours of reaction, the conversion rate of propane is 27%, and the selectivity of propylene is 27%. was 90.4%.

Embodiment 3

[0047] Steps 1) and 3) are the same as in Example 1, the mass ratio of the pre-carbonized sample in step 2) to sodium hydroxide is 1:2, and other reaction conditions remain unchanged. The obtained biomass carbon material surface is 1274m 2 g -1 , the pore volume is 0.98cc / g.

[0048] The evaluation conditions are the same as in Example 1, and the results show that the initial propane conversion rate of the biomass carbon material catalyst synthesized by the present invention is 62.6%, and the propylene selectivity is 92.5%. After 50 hours of reaction, the propane conversion rate is 29.8%, and the propylene selectivity was 93.5%.

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Abstract

The invention discloses a propane dehydrogenation catalyst, a preparation method thereof and a method for preparing propylene by propane dehydrogenation. A biomass raw material is used, a treatment mode combining pre-carbonization and alkali activation is adopted, and then water washing is carried out to obtain a good biomass carbon-based catalyst. A method for preparing a catalyst for preparing the propylene by propane dehydrogenation adopts the treatment mode combining pre-carbonization and alkali activation, and specifically comprises the following steps of: (1) drying waste tea leaves at 100 DEG C, crushing, and carrying out heat treatment for 1 to 3 hours in a nitrogen atmosphere at 300 to 400 DEG C to obtain pre-carbonized tea leaves; (2) pulverizing the pre-carbonized tea leaves, mixing the pre-carbonized tea leaves with a sodium hydroxide solution with an appropriate concentration, performing oven drying, and performing alkali activating again. The method for preparing the propylene by propane dehydrogenation comprises the following steps of: carrying out propane dehydrogenation reaction in the presence of the catalyst, and is innovative in that the catalyst is the catalystfor preparing the propylene by propane dehydrogenation.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a propane dehydrogenation catalyst, a preparation method thereof and a method for preparing propylene from propane dehydrogenation. Background technique [0002] Propylene is an important organic petrochemical basic raw material second only to ethylene, and is widely used in the production of chemical products such as polypropylene, acrolein, acrylic acid, glycerin, isopropanol, polyacrylonitrile, and octyl alcohol. In recent years, with the development of the market economy, the demand for downstream products of propylene has risen rapidly, which has greatly promoted the global demand for propylene. At present, the vast majority of propylene comes from the catalytic cracking of petroleum and the cracking of diesel and naphtha. With the increasing shortage of petroleum resources, the traditional propylene production technology can no longer meet the growing demand for propylen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/18C07C5/333C07C11/06
CPCY02P20/52
Inventor 张凌峰陈广忠张为民姚斐
Owner 高化学(江苏)化工新材料有限责任公司
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