Catalytic pyrolysis of woody biomass and cellulosic materials has been investigated by analyzing the effect of catalysts on aqueous phase (sugar rich) and oil phase (lignin rich) organics produced by the preceding thermal pyrolysis. Tests were done in a downer reactor using ZSM-5 and Na2O/γ-Al2O3 as typical commercially available catalysts. Both catalysts converted the aqueous phase organics to coke, water and gas, and deoxygenated and cracked the oil phase organics. The maximum yield of oil phase organics when applying the catalysts never exceeded the corresponding oil yield of thermal pyrolysis (∼22% on carbon basis). Analysis of new results of ex-situ with in-situ catalysis, in combination with earlier reported data, indicates that a path forward to obtain higher oil yields is not expected to come from process improvements. The development of catalysts that can convert the aqueous phase organics (potentially ∼35% on carbon basis) into organic phase ones, instead of cracking and polymerizing them to respectively gas and char, should be considered.

中文翻译：

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是否有可能提高生物质催化热解的产油率？使用市售酸性和碱性催化剂的异位和原位方式的研究

通过分析催化剂对先前热解产生的水相（富含糖）和油相（富含木质素）有机物的影响，研究了木质生物质和纤维素材料的催化热解。使用 ZSM-5 和 Na2O/γ-Al2O3 作为典型的市售催化剂在下行反应器中进行测试。两种催化剂都将水相有机物转化为焦炭、水和气体，并对油相有机物进行脱氧和裂解。应用催化剂时油相有机物的最大产率从未超过相应的热解油产率（约 22% 的碳基）。对使用原位催化的非原位催化的新结果的分析，结合早先报告的数据，表明获得更高产油率的途径预计不会来自工艺改进。