Iron-based catalyst and preparation method thereof

Abstract

The invention discloses a preparation method for an iron-based catalyst. The preparation method comprises the following steps: (1) preparing a mixed aqueous solution of a nickel salt and a gallium salt and impregnating an alumina carrier with the mixed aqueous solution by using a nonsaturated impregnation method; (2) impregnating the carrier roasted in the step (1) with a wetting solution containing an adsorbent by using the unsaturated impregnation method; and (3) subjecting the adsorbent-containing carrier obtained in the step (2) to impregnation of a mixed solution containing active metal iron, an auxiliary agent manganese and an auxiliary agent potassium after drying, carrying out drying and roasting, then carrying out unsaturated spraying and impregnation of a metallic auxiliary agent potassium solution and subjecting the carrier to drying and roasting so as to obtain the catalyst used in preparation of low-carbon olefin from synthetic gas. The catalyst has the characteristics of long-cycle operation activity and high stability and is beneficial for industrial application and promotion.

Description

technical field [0001] The invention relates to an iron-based catalyst and a preparation method thereof, in particular to a highly active and stable supported iron-based syngas-based 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 syngas (which c...

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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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