加氢脱氧
化学
催化作用
四氢呋喃
有机化学
分子
生物量(生态学)
选择性
海洋学
地质学
溶剂
作者
Rhodri W. Jenkins,Cameron M. Moore,Troy A. Semelsberger,Andrew D. Sutton
出处
期刊:Chemcatchem
[Wiley]
日期:2017-04-20
卷期号:9 (14): 2807-2815
被引量:8
标识
DOI:10.1002/cctc.201601678
摘要
Abstract In this work, we describe a simple, heterogeneous catalytic system for the hydrodeoxygenation (HDO) of 5‐nonanone and 2,5‐hexanedione, which we use as model compounds for more complex biomass‐derived molecules. We present the stepwise reduction of ketones by using supported metal and solid acid catalysts to identify the intermediates en route to hydrocarbons. Although monoketone HDO can be achieved rapidly using moderate conditions (Ni/SiO 2 .Al 2 O 3 , HZSM‐5, 200 °C, 1.38 MPa H 2 , 1 h), quantitative γ‐polyketone HDO requires higher pressures and longer reaction times (Pd/Al 2 O 3 , HZSM‐5, 2.76 MPa H 2 , 5 h), although these are more facile conditions than have been reported previously for γ‐polyketone HDO. Stepwise HDO of the γ‐polyketone shows the reaction pathway occurs through ring‐closure to a saturated tetrahydrofuran species intermediate, which requires increased H 2 pressure to ring‐open and subsequently to fully HDO. This work allows for further understanding of bio‐derived molecule defunctionalization mechanisms, and ultimately aids in the promotion of biomass as a feedstock for fuels and chemicals.
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