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Preparation method of dehydrogenation catalyst

A dehydrogenation catalyst, alumina technology, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of active component Pt particle aggregation and growth, olefin selectivity reduction, catalyst deactivation and other problems , to achieve good dehydrogenation activity and selectivity, reduce olefin selectivity, and simplify the preparation method.

Active Publication Date: 2016-05-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hydrothermal dechlorination process not only consumes a lot of energy, but more importantly, at high temperature (above 550°C), the active component Pt particles will aggregate and grow, resulting in a decrease in the selectivity of olefins, and even sintering of Pt, resulting in permanent loss of the catalyst. live

Method used

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  • Preparation method of dehydrogenation catalyst
  • Preparation method of dehydrogenation catalyst

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Experimental program
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Embodiment 1

[0035] The preparation of the carrier: select 200 g of ZSM-5 molecular sieve with a relative crystallinity of 50% and a silicon-to-aluminum ratio of 100, mix it with 350 g of alumina, 25 g of sesame powder and 50 g of a 10% dilute nitric acid solution, and knead the bar. forming. The formed 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, it breaks into a length of 2-5mm and weighs 50ml of the carrier, impregnates and supports the catalytic component Sn, selects tin tetrachloride as the precursor, and is dried and roasted to obtain the Sn-containing carrier. Place it in a rotary evaporator and vacuum for 30 min.

[0036] Prepare the dipping solution: Weigh an appropriate amount of solid chloroplatinic acid and potassium nitrate, dissolve them in 100ml of deionized water, and stir thoroughly. Add nitric acid solution dropwise to adjust the pH value of the immersion li...

Embodiment 2

[0057] The preparation of the carrier: select 200 g of ZSM-5 molecular sieve with a relative crystallinity of 70% and a silicon-to-aluminum ratio of 100, and mix it with 400 g of alumina, 25 g of sesame powder and 50 g of a dilute nitric acid solution with a mass concentration of 10%. 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 calcined in a muffle furnace at 600°C for 7 hours. After cooling, it breaks into a length of 2-5mm and weighs 50ml of the carrier, impregnates and supports the catalytic component Sn, selects tin tetrachloride as the precursor, and is dried and roasted to obtain the Sn-containing carrier. Place it in a rotary evaporator and vacuum for 30 min.

[0058] Prepare the dipping solution: Weigh an appropriate amount of solid chloroplatinic acid and potassium nitrate, dissolve them in 80ml of deionized water, and stir thoroughly. Add nitric acid solution dropwise to adjust the pH value of ...

Embodiment 3

[0063] The preparation of the carrier: select 200g of ZSM-5 molecular sieve with a relative crystallinity of 60% and a silicon-to-aluminum ratio of 150, mix it with 350g alumina, 25g sesame powder and 50g dilute nitric acid solution with a mass concentration of 10%. 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 calcined in a muffle furnace at 600°C for 7 hours. After cooling, it breaks into a length of 2-5mm and weighs 50ml of the carrier, impregnates and supports the catalytic component Sn, selects tin tetrachloride as the precursor, and is dried and roasted to obtain the Sn-containing carrier. Place it in a rotary evaporator and vacuum for 60 minutes.

[0064] Prepare the dipping solution: Weigh an appropriate amount of solid chloroplatinic acid and potassium nitrate, dissolve them in 120ml of deionized water, and stir thoroughly. Add nitric acid solution dropwise to adjust the pH value of the immersion ...

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Abstract

The invention discloses a preparation method of a dehydrogenation catalyst. The preparation method comprises the following steps: (1) the ZSM-5 molecular sieve, aluminum oxide, sesbania powder and a dilute nitric acid solution are mixed, pulping, mixing and kneading, band extrusion, drying, and calcination are carried out, and the aluminum oxide carrier doped with ZSM-5 molecular sieve is obtained; wherein relative crystallinity of the ZSM-5 molecular sieve is 40-80%; (2) the carrier obtained in the step (1) is impregnated with an Sn-containing precursor, drying and calcination are carried out, and an Sn-loaded aluminum oxide carrier is obtained; (2) chloroplatinic acid, potassium nitrate and water are uniformly mixed, an impregnating solution is obtained, and the carrier obtained in the step (2) is impregnated with the impregnating solution; (4) programmed heating and drying, calcination, washing, drying and dehydration, and modification with a metal additive are carried out for the carrier which is treated by the impregnation in the step (3), and the dehydrogenation catalyst is obtained. The catalyst has the advantages of high alkane transformation efficiency, good alkene selectivity and good stability in the dehydrogenation reaction of light alkanes.

Description

technical field [0001] The invention relates to a preparation method of a catalyst for the catalytic dehydrogenation of light alkanes to olefins. 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 ...

Claims

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Application Information

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IPC IPC(8): B01J29/22B01J29/24C07C11/06C07C5/333
CPCY02P20/52
Inventor 王振宇张海娟李江红
Owner CHINA PETROLEUM & CHEM CORP
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