Preparation method and application of novel biochar-based tar cracking catalyst

A tar cracking and biochar technology, applied in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc. Effect

Inactive Publication Date: 2021-09-24
ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to provide a biochar-Fe2O3 tar cracking catalyst and its preparation method for improving the catalytic effect of biochar on tar cracking, so as to solve the shortcomings of existing materials

Method used

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  • Preparation method and application of novel biochar-based tar cracking catalyst
  • Preparation method and application of novel biochar-based tar cracking catalyst

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Embodiment

[0017] A preparation method of a novel biochar-based tar catalyst, the catalyst takes biochar as a carrier, and the surface supports Fe2O3, and its preparation steps are as follows:

[0018] a. Pretreatment of biomass raw materials: place the biomass raw material rice husks in an environment of 105°C to dry for 5-10 hours, and then use a pulverizer to process them into 0.2-0.8mm powders for later use.

[0019] b. Preparation of biochar: put a certain amount of rice husk powder in a fixed-bed reactor, feed a certain amount of nitrogen at the same time, raise the temperature of the reactor to 800-900°C, and maintain it for 10 minutes after reaching the target temperature. -30min; then switch nitrogen to a nitrogen / water vapor mixture for activation, where the concentration of water vapor is 5%-20%, the reaction temperature is adjusted to 700-900°C, and the activation time is 10min-60min. After the activation is complete, the reaction atmosphere is readjusted to a nitrogen atmosp...

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Abstract

The invention discloses a preparation method and application of the novel biochar-based tar cracking catalyst. The method comprises the steps of performing pyrolysis in an inert atmosphere to a biomass raw material and activation in a water vapor/carbon dioxide atmosphere in a gasification furnace, and performing pyrolysis and activation to the biomass raw material to form porous biochar with a large specific surface area; synthesizing and calcining an iron precursor Fe3 (NO3) 3.9 H2O to obtain Fe2O3 nanoparticles, and synthesizing the biochar and the Fe2O3 nanoparticles at a proper temperature to obtain the biochar-Fe2O3 tar cracking catalyst. The biochar has rich pore structures, functional groups, alkali metals and alkaline earth metal elements and can play a relatively strong role in adsorbing and catalyzing tar, and Fe2O3 contains lattice oxygen and can continuously supply oxygen for the synergistic effect between the catalyst and the tar, so that the stability of the biochar catalyst is ensured, the catalytic performance of the biochar catalyst at medium and low temperatures is improved, and the rich pore structure of the biochar can disperse Fe2O3 and prevent the Fe2O3 from being agglomerated or sintered.

Description

technical field [0001] The invention relates to the field of preparation of biochar-based tar catalysts, in particular to a preparation method and application of a novel biochar-based tar cracking catalyst. Background technique [0002] Tar is one of the products of the biomass gasification process, which not only affects the stability of the system operation, but also reduces the overall efficiency of the gasification process. Moreover, different biomass syngas applications have strict requirements on the tar content. For example, gas turbine power generation requires the tar content of the syngas to be less than 50mg / Nm3. Development is strategic. Catalytic cracking is considered to be one of the best tar removal methods. By adding a catalyst to reduce the activation energy of the reaction, the tar is converted into light gas at a lower temperature, thereby reducing the tar content in the gas. Biochar is produced "in situ" from biomass. Because of its rich pore structure...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745B01J35/02B01J35/10C10J3/64
CPCB01J23/745B01J35/026B01J35/1004C10J3/64Y02P20/52
Inventor 叶超叶泽甫朱竹军王勤辉
Owner ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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