Catalyst for biomass tar cracking and preparation method thereof

Abstract

The invention relates to a catalyst for biomass tar cracking and a preparation method thereof. The catalyst is prepared from biomass semicoke, tar, chromium oxide green, copper oxide, cesium hydroxide, lithium hydroxide, barium hydroxide, rubidium hydroxide, manganese dioxide, nickel oxide, sodium oxide, and alumina binder. The invention solves the problem of catalyst inactivation, such as separation and aggregation of metal oxides and auxiliary components and coking and carbon deposition, and realizes the recycling of biological semicoke catalysts, using the biomass pyrolysis catalyst to assist microwaves to pyrolyze and gasify biomass can obtain a high gasification efficiency and high-quality synthetic gas product under low temperature, exogenous gas, such as vapor, is not introduced forconsumption into the whole process, and therefore the energy consumption and production cost of the process are remarkably reduced.

Description

technical field [0001] The invention belongs to the technical field of energy saving and environmental protection, and in particular relates to a catalyst for cracking biomass tar and a preparation method thereof. Background technique [0002] Biomass pyrolysis liquefaction is to directly pyrolyze biomass under the conditions of medium temperature (500-650°C), high heating rate (104-105°C / s) and extremely short gas residence time (<2s). Cooling allows intermediate liquid product molecules to condense before further fragmentation to gas, resulting in high yields of biomass liquid oils. However, the common problem of existing biomass cracking technology is that the catalyst is difficult to recycle and reuse, and in order to improve H2 / CO, a large amount of water vapor is consumed, energy consumption and gas consumption are increased, and the process economy is not high. Contents of the invention [0003] In view of the problems existing in the prior art, the invention pr...

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Problems solved by technology

[0005] According to the catalyst for cracking biomass tar and its preparation method provided by the present invention, a biomass synthesis gas catalyst is prepared by compounding biological semi-coke, metal oxides and auxiliary components for microwave pyrolysis gasification of biomass, solving the problem of metal Catalyst deactivation problems such as separation and aggregation of oxides and auxiliary components, coking and carbon deposition have realized the recycling of bio-semi-coke catalysts, and the use of biomass pyrolysis catalysts to assist microwave pyrolysis and gasification of biomass can be obtained at lower temperatures High gasification efficiency and high-quality syngas products, the whole process does not introduce exogenous gas consumption such as water vapor, which significantly reduces process energy consumption and production costs

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