Journal of Catalysis ( IF 7.3 ) Pub Date : 2018-05-26 , DOI: 10.1016/j.jcat.2018.05.011 Trent L. Silbaugh , Pierre Devlaminck , John A. Sofranko , Mark A. Barteau
In an effort to verify a previous striking report that ethanol could be oxidized selectively to ethylene oxide, ethanol oxidation on Ag, Cu, or Au nanoparticles supported on Li2O/γ-Al2O3 or γ-Al2O3 was examined between 100 and 400 °C. Ag and Cu catalysts were found to be highly selective to acetaldehyde (>95% on Ag below 325 °C and on Cu below 250 °C). On Au, selectivities to acetaldehyde were lower, with higher selectivity to ethyl acetate and acetic acid. No ethylene oxide was observed under any conditions. Our results, including selectivity variations among these metals, are consistent with previous studies of ethanol oxidation over coinage metals supported on γ-Al2O3, with no changes in primary product identity and minor changes in selectivity upon addition of Li2O. Unfortunately, these results are in direct contradiction to previous work reporting the desirable direct conversion of ethanol to ethylene oxide on Ag, Cu, and Au on Li2O/γ-Al2O3.
中文翻译:
乙醇的Ag,Cu,Au中选择氧化的纳米颗粒负载于栗2 O /γ-Al系2 ö 3
在努力验证前次打击报告乙醇可被选择性地氧化成环氧乙烷,对银,铜乙醇氧化,或Au纳米颗粒负载于栗2 ö的γ-Al / 2 ö 3或γ-Al系2 ö 3检查100至400°C之间。发现Ag和Cu催化剂对乙醛具有高度选择性(在低于325℃的Ag上和在低于250℃的Cu上> 95%)。在金上,对乙醛的选择性较低,对乙酸乙酯和乙酸的选择性较高。在任何条件下均未观察到环氧乙烷。我们的研究结果,包括这些金属中选择性的变化,与乙醇氧化过的金属铸币以前的研究相一致支持的γ-Al 2 Ø如图3所示,在添加Li 2 O时,初级产物的特性没有变化,而选择性也没有变化。不幸的是,这些结果与先前的工作直接矛盾,后者报道了在Ag,Cu和Au上乙醇直接转化为环氧乙烷的理想方法。李2 O /γ-Al系2 Ø 3。