Catalyst for preparation of olefin from synthesis gas as well as preparation method and application of catalyst

Abstract

The invention discloses a preparation method of a catalyst for preparation of olefin from synthesis gas. The preparation method comprises the following steps: (1) dipping a nitrogen-containing organic compound aqueous solution with an aluminum oxide carrier under the isovolumetric saturation condition, and drying after dipping until the adsorption amount of the nitrogen-containing organic compound aqueous solution is 30 to 60 percent of the amount of the aluminum oxide carrier saturated absorbing solution; (2) preparing a mixed aqueous solution of nickel salt and gallium salt, and dipping the mixed aqueous solution with the modified aluminum oxide carrier prepared in the step (1) by an unsaturated dipping method; (3) dipping the carrier roasted in the step (2) without wetting liquid containing an adsorbent by an unsaturated dipping method; (4) dipping a solution containing active metal iron with the adsorbent-containing carrier in the step (3), drying, roasting, dipping with metal additives, and drying and roasting again to prepare the catalyst for preparation of low-carbon olefin by the synthesis gas. The catalyst has the characteristic of high long-period operation activity stability and is favorable for industrial application and popularization.

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...

AI Technical Summary

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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