Iron-based supported catalyst and preparation method thereof

Abstract

The invention discloses an iron-based supported catalyst and a preparation method thereof. The preparation of the catalyst comprises the following steps: (1) carrying out isopyknic saturated impregnation on an alumina carrier by the use of a buffer solution containing ammonium salt; (2) preparing a mixed aqueous solution of nickel salt and gallium salt, and impregnating the modified alumina carrier prepared in the step (1) in the above mixed aqueous solution by a unsaturated impregnation method; (3) impregnating the roasted carrier obtained in the step (2) in a wetting liquid containing an adsorbent by a unsaturated impregnation method; and (4) impregnating the carrier containing the adsorbent in the step (3) into a solution containing active metal ion and an auxiliary agent manganese, drying, roasting, impregnating with a metal additive potassium solution, drying, roasting to prepare the catalyst for preparing low-carbon olefin by catalyzing synthesis gas. The catalyst has the characteristic of high activity stability for long-term operation and is beneficial to industrial application and promotion.

Description

technical field [0001] The invention relates to an iron-based supported catalyst and a preparation method thereof, in particular to a highly active and stable supported iron-based syngas-producing low-carbon olefin catalyst and a preparation method thereof. Background technique [0002] Low-carbon olefins such as ethylene and propylene are important basic organic chemical raw materials. With the development of the chemical industry, their demand is increasing. So far, the way to produce low-carbon olefins such as ethylene and propylene is mainly through the cracking process of light oil. With the increasing depletion of petroleum resources worldwide, the future energy structure will inevitably shift. Compared with oil resources, coal and natural gas resources are relatively abundant, and it is of great significance to develop low-carbon olefin production processes based on coal and natural gas. The development of direct production of ethylene and propylene technology from s...

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Problems solved by technology

[0003] CN1065026A discloses a method for producing ethylene from synthesis gas, which involves the preparation of catalysts by chemical precipitation and mechanical mixing, using precious metals or rare metals, such as niobium, gallium, praseodymium, scandium, indium, cerium, lanthanum, ytterbium, etc. For other chemical elements, the selectivity of ethylene is 65%-94%, but the conversion rate of CO is very low, only about 10%, 12% and 15%. The recycling of CO will inevitably lead to energy consumption, and the catalyst cost is high

However, the activity stability of the long-term operation of the above-mentioned Fe-based silica gel-supported synthesis gas to directly prepare low-carbon olefins catalysts still needs to be further improved.

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