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

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...

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

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