Catalyst for producing olefins from synthesis gas and preparation method thereof

Abstract

The invention discloses a preparation method for a catalyst used in preparation of low-carbon olefin from synthetic gas. The preparation method comprises the following steps: (1) subjecting an alumina carrier to equivalent-volume saturated impregnation of an acidic solution containing sugar, then drying the alumina carrier until the adsorption quantity of the acidic solution containing sugar is 30 to 60% of the saturated solution absorption quantity of the alumina carrier and carrying out ageing, drying and roasting so as to obtain a modified alumina carrier; (2) impregnating the modified alumina carrier prepared in the step (1) in a zinc salt solution by using a nonsaturated impregnation method and then carrying out drying and roasting; (3) impregnating the roasted carrier in the step (2) with a wetting solution containing an adsorbent by using the nonsaturated impregnation method; and (4) subjecting the adsorbent-containing carrier obtained in the step (3) to saturated co-impregnation of a mixed solution containing active metal iron, an auxiliary agent manganese and an auxiliary agent potassium after drying and carrying out 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 a catalyst for producing olefins from synthesis gas and a preparation method thereof, in particular to a high-activity and stability loaded iron-based catalyst for producing low-carbon olefins from synthesis gas 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 oil 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 a...

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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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