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Catalyst used for preparing isobutene through isobutane dehydrogenation and preparation method and application thereof

A technology for producing isobutene and catalysts, which is applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., can solve the problem of insufficient mechanical strength and high temperature stability, isobutane Deep dehydrogenation and cracking, poor dispersion of active components and other problems, to achieve the effect of inhibiting the formation of carbon deposits, high conversion rate of isobutane, and improving conversion rate of catalytic reaction

Active Publication Date: 2015-04-22
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Most of the existing isobutane dehydrogenation catalysts are prepared by the traditional impregnation method, which has disadvantages such as poor dispersion of active components and uneven particle size; the γ-Al 2 o 3 The strong acidity of the carrier can easily cause side reactions such as deep dehydrogenation and cracking of isobutane; various modified carriers can improve the conversion rate and selectivity of the reaction to a certain extent, but their mechanical strength and high temperature stability are still not enough ideal

Method used

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Examples

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Effect test

Embodiment 1

[0039] This example provides a catalyst for producing isobutene by isobutane dehydrogenation. The catalyst uses magnesium aluminum spinel as a carrier, platinum nanoparticles as an active component, tin as a first auxiliary agent, and alkali metal potassium as a catalyst. The second auxiliary agent; its preparation process comprises the following steps:

[0040] Preparation of Magnesium Aluminum Spinel Support by Co-precipitation

[0041] Weigh 5.6354g Mg(NO 3 ) 2 ·6H 2 O and 8.2447g Al(NO 3 ) 3 9H 2 O, dissolve it in deionized water, stir and mix evenly, add dropwise ammonia water with a volume fraction of 50% to adjust the pH to 10, react to obtain a white colloid, filter, wash, dry at 120°C for 12 hours, and roast at 500°C for 4 Hours, a magnesium aluminum spinel carrier was obtained.

[0042] Preparation of Platinum Nanosol

[0043] The concentration of 8mL is 7.723×10 -3 mol / L of H 2 PtCl 6 The aqueous solution was fully mixed with 0.2252g stabilizer CTAB, and ...

Embodiment 2

[0050] This embodiment provides the application of the catalyst for isobutane dehydrogenation to isobutene obtained in Example 1 in isobutane dehydrogenation to isobutene, which includes the following steps:

[0051] The above-mentioned catalyst is reduced and activated in a hydrogen atmosphere, the reduction and activation temperature is 500 ° C, and the reduction and activation time is 2 hours;

[0052] The mixture of isobutane and hydrogen is used as the raw material, the molar ratio is 1:1, and the dehydrogenation reaction is carried out in the reactor. The operating conditions of the dehydrogenation reaction are as follows: the reaction temperature is 590°C, and the volume space velocity is 1350h -1 , The reaction pressure is normal pressure.

[0053] After the reaction, a gas chromatograph (model hp5830) was used to analyze the reaction tail gas online, the carrier gas was nitrogen, the detector was a hydrogen flame ionization detector, and a chromatographic workstation ...

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Abstract

The invention provides a catalyst used for preparing isobutene through isobutane dehydrogenation and a preparation method and application of the catalyst. According to the catalyst, magnesium aluminate spinels serve as carriers, platinum nanoparticles serve as active components, tin serves as a first addition agent, and alkaline metal or alkaline-earth metal serves as a second addition agent; by weight of the magnesium aluminate spinel carriers, the capacity of the platinum nanoparticles is 0.2-0.6 wt%, the capacity of the first addition agent is 0.01-2 wt%, and the capacity of the second addition agent is 0.5-2 wt%. The invention further provides the preparation method of the catalyst and application of the catalyst in the field of preparing isobutene through isobutane dehydrogenation. The catalyst used for preparing the isobutene through isobutane dehydrogenation has high isobutane conversion rate and high isobutene selectivity; moreover the catalyst has good high-temperature stability; meanwhile the catalyst can inhibit deposited carbon from forming, and therefore side reactions can be effectively inhibited.

Description

technical field [0001] The invention provides a catalyst for isobutane dehydrogenation to produce isobutene, a preparation method and application thereof, and relates to the technical field of chemical industry, in particular to the technical field of catalytic dehydrogenation. Background technique [0002] As an important organic chemical raw material, isobutylene is mainly used in the production of methyl tert-butyl ether (MTBE), polyisobutylene, butyl rubber, organic glass and other chemical products. With the widening of isobutene application fields, the demand for isobutene is also increasing. my country is rich in C4 resources. Among them, isobutane exists in liquefied petroleum gas and catalytic cracking petroleum gas as a by-product in the petroleum processing process. However, most of the isobutane is burned as civil fuel at present, resulting in isobutane The utilization rate of butane is extremely low, resulting in a great waste of resources. Facing the contradic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/62C07C11/09C07C5/333
Inventor 孙兰义马占华王俊李军
Owner PETROCHINA CO LTD
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