Preparation method and application of cracking catalyst for biomass gasification tar

Abstract

The invention discloses a cracking catalyst for biomass gasification tar and a preparation method thereof. The preparation method comprises the following preparing steps of: 1, preprocessing a carrier to prepare 16 to 100 meshes of olivine carrier particles; 2, introducing a main active component, i.e. mixing the olivine carrier particles and 0.01 to 2.0g / mL of Ni(NO3)2.6H2O aqueous solution, stirring the mixture for 2 to 15 hours at a temperature of 30 DEG C to 80 DEG C, then drying the stirred mixture for 12 hours at a temperature of 110 DEG C, placing an obtained test sample into a muffle furnace, calcining the test sample for 3 to 20 hours at a temperature of 500 to 1,000 DEG C, cooling the calcined test sample to the room temperature and grinding the cooled test sample; 3, introducing functional assistant active components, i.e. respectively mixing the loaded olivine particles and 0.01 to 1.5g / mL of Ce(NO3)3.6H2O aqueous solution and 0.01 to 1.5g / mL of ammonium tungstate aqueous solution, stirring the mixture for 2 to 15 hours at a temperature of 30 DEG C to 80 DEG C, then drying the stirred mixture for 12 hours at a temperature of 110 DEG C, placing an obtained test sample into the muffle furnace, calcining the test sample for 3 to 20 hours at a temperature of 500 to 1,000 DEG C, cooling the calcined test sample to the room temperature and grinding the cooled test sample; 4, forming the catalyst; and 5, activating the catalyst. The catalyst prepared by the preparation method has the advantages of high mechanical strength, strong capability of resisting to carbon formation inactivation and nickel sintering inactivation, strong capability of resisting to H2S poisoning and strong capability of removing tar.

Description

technical field [0001] The invention relates to a catalyst and its preparation method and application, in particular to a catalyst capable of cracking tar produced in a biomass gasification process and converting it into combustible gas and its preparation method, belonging to the field of renewable energy. Background technique [0002] With the massive exploitation of fossil energy and increasingly serious environmental problems, the search and development of new energy sources, especially renewable clean energy sources with little environmental pollution, has attracted global attention. Among renewable energy sources, biomass is the only carbon resource that can be converted into fuels and chemicals. It is called green coal for immediate use, and biomass gasification technology is one of the most effective ways to convert and utilize biomass energy. [0003] In the process of biomass gasification, biomass tar is inevitably generated. The existence of tar has many adverse ...

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Problems solved by technology

[0010] The above patents are all prepared with dolomite as the carrier. Dolomite has low mechanical strength and poor wear resistance. With the prolongation of the catalytic cracking operation time, the catalyst with dolomite as the carrier wears seriously, and it is easy to follow the gasification gas. Leaving the gasifier reduces the tar cracking ability of the catalyst and increases the ash content of the gasification gas, especially when used for tar removal in a fluidized bed

Although the nickel-based catalyst has good tar cracking ability, it is easy to lose its activity due to the carbon on the surface and the sintering of nickel particles. If the biomass gasification gas contains a small amount of H 2 S gas is easy to cause poisoning of nickel-based catalysts. In the above-mentioned patents, no measures are taken to prevent the deactivation and poisoning of nickel-based catalysts, which makes these catalysts have a short service life.

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