A kind of cobalt-based Fischer-Tropsch fixed bed catalyst for biomass synthesis gas and preparation method thereof

Abstract

The invention belongs to the biomass energy utilization technology field, and discloses a cobalt-based Fischer-Tropsch fixed bed catalyst used for biomass synthetic gas and a preparation method therefor. The catalyst is composed of the following materials, by weight, 5-15% of Co3O4, CuO with a content of being more than 0 and less than or equal to 5%, 0.1-1% of RuO2, 3-20% of ZrO2, and the balance being gamma-aluminum oxide. The preparation method is as follows: first, gamma-aluminum oxide with a BET specific area of 180-210 m<2> / g and an average pore size of 14-16 nm is weighed according to required weight, the gamma-aluminum is peptized with 1-3wt% of concentrated nitric acid, then 0.5-2wt% of a pore forming agent CMC and 0.5-2wt% of auxiliary extruding agent sesbania powder are added, after the above mixture is mixed, pinched, ground and agglomerated, strip extrusion molding is carried out, after drying and calcinations, an alumina carrier is obtained; second, ZrO2 component is loaded through a saturation impregnation method, and a catalyst carrier is obtained after drying and calcination; third, Co3O4, CuO and RuO2 components are loaded through a saturation impregnation method, and a catalyst is obtained after drying and calcination. The catalyst has high CO hydrogenation catalytic activity and C<+5> selectivity, and low CH4 and CO2 selectivity.

Description

technical field [0001] The invention belongs to the technical field of biomass energy utilization, in particular to a cobalt-based Fischer-Tropsch fixed-bed catalyst for biomass synthesis gas and a preparation method thereof. Background technique [0002] For a long time, the utilization of biomass energy resources has been dominated by direct combustion, which is not only inefficient, but also pollutes the environment. With the development of science and technology, biomass energy resources can be converted and efficiently utilized through various technologies to generate electricity and heat, or to produce biofuels, such as ethanol, biodiesel and biogas. Biomass gasification synthesis of clean fuel technology is to store in biomass and use the C, H components and heat energy obtained from solar photosynthesis to obtain high-quality, ultra-clean fuels through biomass gasification-Fischer-Tropsch synthesis. of liquid fuel. In this process, Fischer-Tropsch synthesis catalys...

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Problems solved by technology

The above-mentioned catalysts are mainly researched on the synthesis gas prepared from coal and natural gas as raw materials for Fischer-Tropsch synthesis, especially for biomass synthesis gas, the catalytic activity of CO hydrogenation, C 5+ Selectivity and thermal stability need to be further improved, CH 4 and CO 2 Selectivity needs to be further reduced