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Composite catalyst, preparation method as well as application thereof in reaction of preparing isobutene by dehydrogenating iso-butane

A catalyst and composite technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of shortened catalyst service life, poor catalytic reaction stability, and product side effects Reaction and other problems, to achieve the effects of good permeability, mass transfer and heat transfer performance, not easy to deep dehydrogenation, and high reaction stability

Inactive Publication Date: 2017-11-24
SINOPEC ENG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to its poor stability and carcinogenicity, Cr-based catalysts are less studied at present; Pt-based catalysts mainly use Al 2 o 3 As a carrier, but it is expensive, and it is easy to cause carbon deposition and inactivation under high temperature reaction, resulting in poor stability
Although these catalysts have high alkane conversion and olefin selectivity under certain conditions, there are problems such as large catalyst stack ratio, large bed pressure drop, low reaction space velocity, and slow mass and heat transfer in this type of process. The bed temperature distribution is uneven, resulting in local hot spots, and the product is prone to further side reactions, and platinum is easy to aggregate under high temperature conditions, resulting in a decrease in catalytic activity and selectivity and an increase in the pressure drop of the reaction bed, and even deep dehydrogenation leads to carbon deposition on the catalyst Deactivation, thus affecting the normal progress of the reaction, resulting in poor stability of the catalytic reaction and shortening the service life of the catalyst

Method used

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  • Composite catalyst, preparation method as well as application thereof in reaction of preparing isobutene by dehydrogenating iso-butane
  • Composite catalyst, preparation method as well as application thereof in reaction of preparing isobutene by dehydrogenating iso-butane

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preparation example Construction

[0048] In the second aspect, the present invention provides a method for preparing a composite catalyst, comprising the following steps: uniformly mixing the supported platinum catalyst, metal microfibers and paper pulp, and then forming a filter cake by papermaking, then drying and oxidizing the filter cake, Sintering in a hydrogen atmosphere, and finally firing in an oxidizing atmosphere to obtain the composite catalyst.

[0049] The preparation method of the above-mentioned composite catalyst has reasonable process steps, simple method, easy-to-obtain raw materials, and controllable structure, which can make the supported platinum catalyst evenly included in the three-dimensional network formed by sintering metal microfibers (the contact of metal microfibers during sintering The metal microfibers are fused together to form a three-dimensional network), and the obtained composite catalyst has a large void ratio, good permeability, mass and heat transfer performance, good low-...

Embodiment 1

[0061] A kind of composite catalyst mainly is made up of supported platinum catalyst Pt / AlO and nickel microfiber, and its preparation method is:

[0062] Mix 10 g of nickel microfibers with a length of 2-3 mm and a diameter of 8 μm, 5 g of supported platinum catalyst Pt / AlO with a particle diameter of 250-500 microns, 3.3 g of cellulose (filter paper) and 1 L of water, stir evenly, and place on the paper The paper is formed on the forming machine, and the obtained thin-layer filter cake is dried in the air at 110°C, oxidized in the air at 450°C for 1 hour, and then roasted in a hydrogen atmosphere at 900°C for 1 hour to fuse the contact points of the microfibers. Calcined in air at 600°C for 4h. Thus the composite catalyst Pt / AlO-S-Ni was prepared.

[0063] Wherein, the loading amount of platinum in the supported platinum catalyst is 0.5%.

[0064] Composite catalyst Pt / AlO-S-Ni scanning electron microscope (SEM) photo is referred to in embodiment 1 figure 1 .

Embodiment 2

[0066] A kind of composite catalyst mainly is made up of supported platinum catalyst PtSn / AlO and nickel microfiber, and its preparation method is:

[0067] Mix 10g of nickel microfibers with a length of 2-3mm and a diameter of 8μm, 5g of supported platinum catalyst PtSn / AlO with a particle diameter of 250-500μm, 3.3g of cellulose and 1L of water, stir well, and place on a paper former Papermaking molding, the obtained thin-layer filter cake is dried in the air at 110°C, oxidized in the air at 450°C for 1 hour, and then roasted in a hydrogen atmosphere at 900°C for 1 hour to fuse the contact points of the microfibers, and finally in the air Calcined at 600°C for 4h. Thus the composite catalyst PtSn / AlO-S-Ni was prepared.

[0068] Wherein, the loading amount of platinum in the supported platinum catalyst is 0.5%, and the loading amount of tin is 3%.

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Abstract

The invention relates to the field of catalysts, and particularly provides a composite catalyst, a preparation method and application thereof in reaction of preparing isobutene by dehydrogenating iso-butane. The composite catalyst is mainly prepared from a load platinum catalyst and metal microfibers, wherein the load platinum catalyst is coated by a three-dimensional network formed by the microfibers. The composite catalyst has a large void ratio, good permeability, good mass transfer and heat conduction performance, good low-temperature activity, good selectivity, good stability, low cost and long service life; and when the composite catalyst is used in the reaction of preparing the isobutene by dehydrogenating iso-butane, the alkane conversion rate and the selectivity of the iso-butane can be improved.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to a composite catalyst, a preparation method and its application in the reaction of isobutane dehydrogenation to prepare isobutene. Background technique [0002] Butene is an important organic chemical raw material, especially isobutene, which is widely used in the production of polyisobutene, MTBE, tert-butanol, butyl rubber, alkylation of light olefins, mixed light olefins, organic glass and other chemicals . In recent years, the demand for isobutene has been increasing year by year. In the traditional process, isobutene mainly comes from the by-products of naphtha cracking and catalytic cracking. With the continuous development of isobutene downstream products, the isobutene produced by traditional processes is far from being able to meet Market demand. However, most of the butane produced in the petroleum processing process and the butane in the liquefied petroleum gas are consumed a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/42B01J23/89C07C5/333C07C11/09
CPCB01J23/8966B01J23/42C07C5/3337C07C11/09
Inventor 毛继平韩海波宋业恒张国良郝代军陈新宇江莉何文秦毓辰
Owner SINOPEC ENG GRP CO LTD
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