Iron-based catalyst prepared by sol-gel combustion method, and preparation method and applications of iron-based catalyst

Abstract

The invention discloses an iron-based catalyst prepared by a sol-gel combustion method, which is characterized by containing a metal element Fe, a metal element A and a metal element B, wherein A is at least one selected from the group consisting of Mn, Co, Cu, Zn, Ti, Al, Cr, Ni, Ce, and Zr; B is at least one selected from the group consisting of Li, Na, K, Mg, and Ca; each metal element exists in the form of a metal simple substance and / or a metal oxide; and the content of the metal element A in the catalyst is 0.1-50 wt%, the content of the metal element B in the catalyst is 0.01-40 wt%, and the content of the metal element Fe in the catalyst is 50-99 wt%, based on the total amount of the metal elements contained in the catalyst. The catalyst has good resistance to carbon deposition, is used for reaction of preparation of low-carbon olefins by use of synthetic gas, and shows higher catalytic activity and low-carbon olefin selectivity.

Description

technical field [0001] The application relates to an iron-based catalyst prepared by a sol-gel combustion method, its preparation method and its application in the reaction of producing low-carbon olefins from syngas. Background technique [0002] Ethylene and propylene are bulk chemical raw materials, which occupy a very important position in the national economy. The traditional production method is through petroleum catalytic cracking. However, my country's energy structure is characterized by rich coal, lack of oil, and little gas. The conversion of coal-based synthesis gas Low-carbon olefins can effectively reduce dependence on petroleum resources. Iron-based catalysts are the preferred catalysts for the direct preparation of light olefins from syngas due to their high catalytic efficiency. Iron-based catalysts are the focus of research on the direct preparation of low-carbon olefins from coal-based synthesis gas. They are inexpensive, allow a wide range of operating te...

AI Technical Summary

Problems solved by technology

When the reaction temperature of the iron-based catalyst prepared by the co-precipitation method is high, a large amount of carbon deposits will be generated, causing the catalyst to be pulverized, the mechanical strength will be reduced, and the catalytic bed and separation equipment will be severely blocked. At the same time, the active site will be blocked, resulting in catalytic activity and low-carbon olefin selection. Sexual decline (Science 2012, 335, 835-838; ACS Catalysis 2013, 3, 2130-2149.)

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