Cascade Reactions for the Continuous and Selective Production of Isobutene from Bioderived Acetic Acid Over Zinc-Zirconia Catalysts
作者:Anthony J. Crisci、Herui Dou、Teerawit Prasomsri、Yuriy Román-Leshkov
DOI:10.1021/cs501018k
日期:2014.11.7
isobutene over a ZnxZryOz binary metal oxide. The reaction proceeds via a three-step cascade involving ketonization, aldol condensation, and C–C hydrolytic bond cleavage reactions, which was corroborated by isotopic labeling studies. Separately, ZnO and ZrO2 are incapable of producing isobutene from either acetic acid or acetone. In contrast, under optimal conditions, a Zn2Zr8Oz catalyst generates
生物油(通过生物质快速热解获得)含有高浓度的乙酸,这会导致与其存储和处理有关的问题。在Zn x Zr y O z二元金属氧化物上,将乙酸直接升级为异丁烯。反应通过三步级联进行,涉及酮化,羟醛缩合和C–C水解键裂解反应,这已通过同位素标记研究得到证实。单独地,ZnO和ZrO 2不能从乙酸或丙酮生产异丁烯。相反,在最佳条件下,Zn 2 Zr 8 O z催化剂产生一个ca。50%的异丁烯产率,相当于理论最大值的75%。光谱研究表明,要使异丁烯的产量最大化,就需要平衡浓度的酸和碱。