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Method for cracking biomass pyrolytic tar catalytically using nickel-carrying carbon nano tube

A biomass pyrolysis, carbon nanotube technology, applied in chemical instruments and methods, biofuels, chemical/physical processes, etc., can solve the problems of inappropriate pore structure, low catalyst activity, easy carbon deposition, etc. Mechanical strength and thermal stability, superior catalytic activity, and the effect of preventing deactivation of carbon deposits

Inactive Publication Date: 2012-08-15
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing catalyst supports generally have the problems of small specific surface area and inappropriate pore structure, which lead to low catalyst activity and easy carbon deposition.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Preparation of nickel-loaded carbon nanotubes: according to the equal-volume impregnation method, measure 1.4 g of nickel nitrate (Ni(NO 3 ) 2 ·6H 2 O) Dissolved in 35mL of deionized water, 16g of carbon nanotubes (purchased from Chengdu Organic Chemistry Co., Ltd., Chinese Academy of Sciences, article number TNIM4, purified by liquid phase oxidation) were added to the above nickel nitrate solution, ultrasonically treated for 1h and allowed to stand for 2h ; Then put the above-mentioned materials in an ordinary blast drying oven at 110°C for 3 hours, put the particles into a quartz tube, and continuously feed 20% H at a flow rate of 100mL / min. 2 / 80%N 2 Mixed gas, reduction reaction at 400°C for 3 hours (programmed temperature increase rate is 3°C / min, holding time is 3h), and then cooled to room temperature to obtain 16.28g of nickel-loaded carbon nanotube catalyst, wherein the content of Ni is 1.7 %.

[0020] The above-mentioned nickel-supported carbon nanotube ca...

Embodiment 2

[0023] 16.28 g of nickel-loaded carbon nanotube catalysts prepared in Example 1 were all loaded into a fluidized bed catalytic reactor for online catalytic cracking experiments.

[0024] Using natural air-dried poplar (moisture content 8%) with a particle size of about 2mm as raw material, rapid pyrolysis is carried out in a nitrogen atmosphere at 800°C. After gas-solid separation, the high-temperature pyrolysis gas is directly passed into the catalyst chamber. In the fluidized bed catalytic reactor, control the volume space velocity of the pyrolysis gas in the catalytic reactor to 15000h -1 , the catalyzed tar yield decreased from 32% to 0.78%, the tar content in the gas was 0.96%, and the catalyst did not see obvious carbon deposition within 5 hours.

Embodiment 3

[0026] Preparation of nickel-loaded carbon nanotubes: according to the equal volume impregnation method, measure 3.0 g of nickel acetate (Ni(CH 3 COO) 2 4H 2 O) Dissolved in 35mL of deionized water, 16g of carbon nanotubes (purchased from Chengdu Organic Chemistry Co., Ltd., Chinese Academy of Sciences, article number TNIM4, purified by liquid phase oxidation) were added to the above nickel acetate solution, ultrasonically treated for 3h and allowed to stand for 4h ; Then put the above-mentioned materials in an ordinary blast drying oven at 110°C for 3 hours, put the particles into a quartz tube, and continuously feed 20% H at a flow rate of 100ml / min. 2 / 80%N 2 Mixed gas, reduction reaction at 400°C for 3 hours (programmed temperature increase rate is 3°C / min, holding time is 3h), and then cooled to room temperature to obtain 16.71g of nickel-loaded carbon nanotube catalyst, wherein the content of Ni is 4.2 %.

[0027] The above-mentioned nickel-supported carbon nanotube ...

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Abstract

The invention belongs to the field of biomass energy utilization and particularly relates to a method for cracking biomass pyrolytic tar catalytically using a nickel-carrying carbon nano tube. The method includes: obtaining nickel-based catalyst based on a carbon nano tube carrier by utilizing the carbon nano tube as a carrier and elementary-substance nickel as active component, and allowing for high-efficiency catalytic cracking of the biomass pyrolytic tar using the nickel-based catalyst, wherein the elementary-substance is in mass percentage of 0.5-30% in the composite catalyst. Specific surface area of the catalyst is enlarged greatly by utilizing the carbon nano tube as the carrier, order pore passage structure suitable for cracking reaction of macromolecule organic matters in tar is provided, and combustible gas with tar content smaller than or equal to 1% can be obtained after catalytic cracking of the biomass pyrolytic tar.

Description

technical field [0001] The invention belongs to the field of catalyst and biomass energy utilization, and in particular relates to a method for catalytically cracking biomass and pyrolyzing tar with a nickel-loaded carbon nanotube catalyst. Background technique [0002] my country is a big agricultural country, with a straw output of more than 700 million tons. Biomass gas can be used as fuel for power generation, fuel cell and raw material for Fischer-Tropsch synthesis. However, tar is produced during biomass pyrolysis and gasification. The existence of tar has great harm to the pyrolysis gasification process and related equipment. First of all, the utilization efficiency is reduced. The energy of tar generally accounts for 5-15% of the total energy. This part of energy is difficult to be utilized and is wasted; secondly, tar is condensed during the gas transmission process to form a viscous liquid, which adheres to the pipeline and The wall surface of the equipment will...

Claims

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Application Information

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IPC IPC(8): C10B53/02C10B57/18B01J23/755
CPCY02E50/14Y02E50/10
Inventor 董长青陶君陆强杨勇平胡笑颖
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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