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Continuous pyrolysis and catalytic upgrading of corncob hydrolysis residue in the combined system of auger reactor and downstream fixed-bed reactor

文献类型： 外文期刊

作者： Li, Yuping 1 ; Li, Bosong 1 ; Zhang, Xinghua 1 ; Chen, Lungang 1 ; Zhang, Qi 1 ; Wang, Tiejun 1 ; Ma, Longlong 1 ;

作者机构： 1.Chinese Acad Sci, Guangzhou Inst Energy Convers, Key Lab Renewable Energy, Guangzhou 510640, Guangdong, Peoples R China

2.CATAS, Trop Energy & Ecol Res Ctr, Guangzhou Expt Stn, Guangzhou 510140, Guangdong, Peoples R China

关键词： Pyrolysis;Ex situ catalysis;Bio-oil upgrading;HZSM-5;Mono-phenols and aromatics

期刊名称：ENERGY CONVERSION AND MANAGEMENT （ 影响因子：9.709； 五年影响因子：8.954 ）

ISSN：

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收录情况： SCI

摘要： Continuous pyrolysis of corncob hydrolysis residue, coupled with ex situ catalytic upgrading of the pyrolysis vapor, was investigated in the combined system of an auger reactor and a downstream fixed-bed reactor. The effect of the zeolite catalyst, USY (ultrastable Y) and HZSM-5 (Si/Al=25, 38) and catalytic temperature on the raw bio-oil upgrading were discussed. The results showed the strong acidity of porous zeolite was essential for catalytic deoxygenation during upgrading pyrolysis vapor. HZSM-5 (25), with the strong acidity and acidic sites, had favored the deoxygenation conversion of carbonyl/carboxyl-containing oxygenates in the pyrolysis vapor, which decreased its content to 2.3 area% via the GC-MS analysis of the upgraded bio-oil. Mono-phenols (phenol and alkylphenols) were enhanced to 53.2 area% over HZSM-5 (25), as compared with that of 17.3 area% during non-catalysis process. The addition of ex situ catalytic upgrading had improved the quality of organic big-oil at the expense of its yield. Coke formation on the strong acidic sites by condensation of intermediates is detrimental to organic bio-oil yield. The increase of catalysis temperature at the fixed-bed reactor decreased oxygenate compounds to 7.1 area%, 23 area% and 1.9 area% at 450 degrees C, 550 degrees C and 650 degrees C, respectively, with 0.75 s of vapor residence time. The TG/DTG/DSC characterization of the used HZSM-5 (25) implied that the coke had deposited on the surface of HZSM-5 (25), which could be removed by combustion to recover its activity. (C) 2016 Elsevier Ltd. All rights reserved.

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