Catalyst for preparing propylene by propane dehydrogenation and preparation method of catalyst

Abstract

The invention belongs to the field of catalysts and in particular relates to a catalyst for preparing propylene by propane dehydrogenation and a preparation method of the catalyst. The catalyst is prepared by taking an Al modified SBA-15-SAPO-34 eutectic molecular sieve as a catalyst carrier which loads an active metal Pt and an auxiliary agent Sn. The SAPO-34 molecular sieve provides an acid siteof a reaction and promotes the selectivity of propylene by a duct shape selecting effect. SBA-15 is a mesoporous molecular sieve and is eutectic to the SAPO-34 to provide a mesoporous mass transfer channel, so that a large amount of reaction raw materials are quickly diffused to catalytic active sites to react. Meanwhile, the acidity of the SBA-15 molecular sieve is adjusted by means of a small amount of Al. The catalyst has relatively high catalytic activity and catalytic selectivity to propane dehydrogenation to prepare propylene. The propane conversion ratio can reach 39% and the propyleneselectivity can reach 99%. The catalyst is excellent in carbon deposition resistance and long in service life and has a wide application prospect.

Description

technical field [0001] The invention belongs to the field of catalysts, and in particular relates to a catalyst for preparing propylene by dehydrogenation of propane and a preparation method thereof. Background technique [0002] Propylene is an important basic organic chemical raw material, mainly used to produce chemical intermediates such as polypropylene, acetone, acrylonitrile, and propylene oxide. Since the 21st century, the rapid development of the petrochemical industry has greatly increased the global consumption of propylene. The contradiction between the growing demand for propylene and the difficult to increase propylene production capacity is extremely prominent. The production raw materials of propylene mainly come from the by-products of the petrochemical production process. The methanol to olefin process and the conversion of olefin to propylene are relatively extensive production processes at present. However, the traditional propylene production process can...

AI Technical Summary

Problems solved by technology

The large specific surface area and unique pore channel results of ZSM-5 molecular sieve make the catalyst have higher reactivity and longer life, but the hydrothermal stability of ZSM-5 molecular sieve is poor, the channel diameter is large, and there is no shape selection for the product effect, so the selectivity of propylene is poor

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