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
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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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