High-performance catalyst for preparing low alcohol by synthesis gas and preparation method thereof

Abstract

The invention discloses a high-performance catalyst used for preparing low alcohol by synthesis gas and a preparation method thereof. The structural formula of the catalyst is M1a-Mob-M2c-CNTsd-S, wherein M1 stands for one or two of Co or Ni, M2 stands for one or several of alkali metals such as K, Na and Cs, S stands for a complex oxide support TiO2-SiO2 orSiO2-Al2O3, a, b, c and d stand for the mass fractions of each substance in the catalyst respectively, a=10%-20%, b=20%-40%, c=0%-5%, d=10%-20%, and the balance is the complex oxide support. According to the catalyst, the preparation method is simple, an in-situ supporting mode is mainly adopted, the metals and carbon nano tubes are deposited onto the support, then spray-drying is conducted to obtain catalyst powder for the low alcohol with high-dispersion metals and evenly-distributed carbon nano tubes, and after roasting, the catalyst has the advantages of high C2+ alcohol yield and selectivity, high anti-sulfur ability and long lifetime.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to a high-efficiency catalyst for preparing low-carbon alcohols from synthesis gas and a preparation method thereof Background technique [0002] With the continuous heavy and inferior quality of crude oil worldwide, the development of new alternative energy is one of the ways to solve the current energy crisis. The comprehensive utilization of coal-based synthesis gas is a hot topic in current research. my country is a country with more coal and less oil, and the resources of synthesis gas are abundant. The use of efficient and clean coal resource technology to produce low-carbon alcohol green raw materials is an important way for resource utilization and environmental protection. one. Academician Bao Xinhe used the OX-ZEO strategy to successfully convert syngas to C 2 -C 4 Alkenes or alkanes, and the catalyst has a long life, which greatly broadens the industrial application prospects o...

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Problems solved by technology

(3) Octamix process, developed by Germany Lurgi, alkali metal modified Cu-Zn-Al catalytic system, tubular or coiled isothermal reactor, water enters steam and exits to take away reaction heat (EP0034338-A2, US4513100), the The process form has high selectivity, but the catalyst is easily deactivated by heat. The content of low-carbon alcohol in the reaction product is 30% to 50%, and the water content is less than 1%.

The catalyst has high and stable activity, high selectivity of low-carbon mixed alcohols, high space-time yield of low-carbon alcohol ethers, easy production and good repeatability.

[0004] From the above-mentioned patents and literature reports, the catalysts for the preparation of low-carbon alcohols from syngas basically have low conversion rates of CO, C 2 + The phenomenon of poor alcohol selectivity, and due to the presence of a large amount of sulfur in coal-based raw material syngas, the use of MoS 2 The Sygmol process has gradually gained widespread attention due to its high alcohol selectivity and strong sulfur resistance

But the current MoS 2 There are two main problems with the type catalyst: (1) the H in the syngas 2 / CO must be around 1.0; (2) cobalt, nickel, etc. in the catalyst are easy to form carbonyl complexes with CO, resulting in the loss of additives, thereby affecting the life of the catalyst; Long-life high-activity low-carbon alcohol catalyst

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