Method for preparing low-carbon alkane dehydrogenation catalyst

A technology of dehydrogenation catalyst and low-carbon alkanes, which is applied in the direction of hydrocarbons, hydrocarbons, molecular sieve catalysts, etc., and can solve the problems of no industrialization examples of aerobic dehydrogenation technology

Active Publication Date: 2016-04-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • Method for preparing low-carbon alkane dehydrogenation catalyst

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Embodiment 1

[0036] Preparation of the carrier: Select 200g of ZSM-5 molecular sieve with a relative crystallinity of 50% and a silicon-aluminum ratio of 100, mix it with 350g of alumina, 25g of turnip powder and 50g of dilute nitric acid solution with a mass concentration of 10%, knead and extrude forming. The molded carrier was dried in the shade for 24 hours, then dried in an oven at 110° C. for 12 hours, and then baked in a muffle furnace at 600° C. for 6 hours. After cooling, the broken growth length is 2~5mm, and 50ml of the carrier is measured, impregnated with Sn, the catalyst-promoting component, and tin tetrachloride is selected as the precursor, and the Sn-containing carrier is obtained by drying and roasting. It was placed in a rotary evaporator and vacuumed for 30 min.

[0037] Preparation of impregnation solution: appropriate amount of ZnCl 2 Dissolve in 20ml of deionized water, and dropwise add 6ml of ammonia water with a mass concentration of 25% to it, and stir thoroughl...

Embodiment 2

[0053] Preparation of the carrier: Select 200g of ZSM-5 molecular sieve with a relative crystallinity of 70% and a silicon-aluminum ratio of 100, mix it with 400g of alumina, 25g of turnip powder and 50g of dilute nitric acid solution with a mass concentration of 10%, knead and extrude forming. The formed carrier was dried in the shade for 24 hours, then dried in an oven at 110°C for 10 hours, and then baked in a muffle furnace at 600°C for 7 hours. After cooling, the broken growth length is 2~5mm, and 50ml of the carrier is measured, impregnated with Sn, the catalyst-promoting component, and tin tetrachloride is selected as the precursor, and the Sn-containing carrier is obtained by drying and roasting. It was placed in a rotary evaporator and vacuumed for 30 min.

[0054] Preparation of impregnation solution: appropriate amount of ZnCl 2 Dissolve in 20ml of deionized water, and dropwise add 31ml of ammonia water with a mass concentration of 15% to it, and stir thoroughly a...

Embodiment 3

[0057] Preparation of the carrier: Select 200g of ZSM-5 molecular sieve with a relative crystallinity of 60% and a silicon-aluminum ratio of 150, mix it with 350g of alumina, 25g of turnip powder and 50g of dilute nitric acid solution with a mass concentration of 10%, knead and extrude forming. The formed carrier was dried in the shade for 24 hours, then dried in an oven at 110°C for 10 hours, and then baked in a muffle furnace at 600°C for 7 hours. After cooling, the broken growth length is 2~5mm, and 50ml of the carrier is measured, impregnated with Sn, the catalyst-promoting component, and tin tetrachloride is selected as the precursor, and the Sn-containing carrier is obtained by drying and roasting. It was placed in a rotary evaporator and vacuumed for 60 min.

[0058] Preparation of impregnation solution: appropriate amount of ZnCl 2Dissolve in 25ml of deionized water, and dropwise add 28ml of ammonia water with a mass concentration of 20% to it, and stir thoroughly af...

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Abstract

The invention discloses a method for preparing a low-carbon alkane dehydrogenation catalyst. The method comprises the following steps: 1)mixing a ZSM-5 molecular sieve, alumina, sesbania powder and a dilute nitric acid solution, beating the materials, kneading the materials, extruding the materials, drying and performing calcination to obtain a ZSM-5 molecular sieve-doped alumina carrier; 2) impregnating the carrier by using a Sn-containing predecessor solution, drying the carrier and performing calcination on the carrier to obtain the Sn-containing carrier; 3) dropping ammoniacal liquor and adding the material into a ZnCl2 aqueous solution, preparing a Zn(NH3)4C12 solution, adding a platinum-containing compound to prepare an impregnation solution; and 4) performing impregnation on the Sn-containing carrier by using the impregnation solution in the step 4), drying the material, and performing calcination to obtain the low-carbon alkane dehydrogenation catalyst. The prepared low-carbon alkane dehydrogenation catalyst has high alkane conversion rate, alkene selectivity and good stability in a low carbon alkane dehydrogenation reaction.

Description

technical field [0001] The invention relates to a preparation method of a low-carbon alkane dehydrogenation catalyst. Background technique [0002] The development of shale gas in North America has led to a sharp decline in natural gas prices relative to crude oil prices, while the production of large condensate liquids (NGLs) in shale gas has also increased rapidly. Shale gas condensate is rich in low-carbon alkanes such as ethane, propane, and butane. Ethane can be used as a cracking raw material to produce ethylene. Therefore, FCC technology alone cannot meet the rapidly growing demand for propylene. Dehydrogenation of low-carbon alkanes in natural gas (conventional natural gas, shale gas, coalbed methane, combustible ice, etc.) to produce low-carbon olefins is an effective way to solve this problem. Moreover, with the increasing scarcity of petroleum resources, the production of propylene has changed from relying solely on petroleum as a raw material to diversifying the...

Claims

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Application Information

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IPC IPC(8): B01J29/44C07C5/333C07C11/06
CPCY02P20/52
Inventor 王振宇张海娟李江红
Owner CHINA PETROLEUM & CHEM CORP
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