Direct conversion of cellulose and raw biomass to acetonitrile by catalytic fast pyrolysis in ammonia

编号 020019203

推送时间 20190624

研究领域 林产化工 

年份 2019 

类型 期刊 

语种 英语

标题 Direct conversion of cellulose and raw biomass to acetonitrile by catalytic fast pyrolysis in ammonia

来源期刊 Green Chemistry

期 第192期

发表时间 20181205

关键词 cellulose;  raw biomass;  acetonitrile;  pyrolysis; 

摘要 Selective conversion of biomass to value-added chemicals provides a green and sustainable route for the current chemical industry which relies mainly on fossil resources. Acetonitrile (CH3CN) is a widely used solvent and important intermediate in organic and inorganic syntheses. In this study, we show that acetonitrile can be directly produced within seconds from biomass (including cellulose, xylose, lignin, bagasse, rice husk and birch) in ammonia (NH3) over metal oxide modified zeolite catalysts via a coupled process of catalytic fast pyrolysis and ammonization (CFP-A). Catalyzed by CoOx/HZSM-5, acetonitrile is the dominant product from cellulose, with a carbon yield of 32.5% and a selectivity of 84.6% in bio-oil. Both experimental investigation and density functional theory (DFT) calculations on the formation pathways of acetonitrile indicated that they are promoted mainly by the (–Co–O–Si–) sites of the CoOx/HZSM-5 catalyst;cellulose selectively pyrolyzed to C2 oxygenated compounds such as acetaldehyde and acetic acid, which further reacted with ammonia to form imine and amide, and then generated acetonitrile either through dehydrogenation or dehydration. This efficient process provides a promising approach for improved biomass valorization.

服务人员 尚玮姣

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