A Pinch of Salt Improves n-Butanol Selectivity in the Guerbet Condensation of Ethanol over Cu-Doped Mg/Al Oxides,ACS Sustainable Chemistry & Engineering

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A Pinch of Salt Improves n-Butanol Selectivity in the Guerbet Condensation of Ethanol over Cu-Doped Mg/Al Oxides
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2018-10-17 00:00:00 , DOI: 10.1021/acssuschemeng.8b03589
Jacob A. Barrett ₁ , Zachary R. Jones ₁ , Craig Stickelmaier ₁ , Nora Schopp ₁ , Peter C. Ford ₁

Affiliation

Improvement of processes that utilize renewable feedstocks to produce chemicals ordinarily derived from fossil carbon feedstocks is paramount to creating environmentally sustainable chemical and fuel industries. Catalytic conversion of biorefinery-derived ethanol via the Guerbet condensation has the potential to serve such a purpose. In this contribution, we demonstrate marked selectivity changes in the ethanol condensation over a copper-doped porous metal oxide catalyst upon a single exposure to ppm quantities of a soluble chloride source. Without this modification, ethyl acetate is the major product, with the others being n-butanol (principally) plus some 1-hexanol, butyl acetate, and ethyl butanoate. A single exposure to chloride increases activity and, more importantly, dramatically changes selectivity to give n-butanol and 1-hexanol as the largest products. X-ray diffraction and basicity measurements pre- and post-reaction were used to examine how chloride alters the properties of this Earth-abundant catalyst prepared by calcining a Cu-doped Mg/Al hydrotalcite.

中文翻译：

一小撮盐提高了乙醇在铜掺杂的Mg / Al氧化物上的Guerbet冷凝中的正丁醇选择性。

改进利用可再生原料生产通常从化石碳原料中提取的化学药品的过程，对于建立环境可持续的化学和燃料产业至关重要。通过Guerbet缩合反应对生物炼制厂衍生的乙醇进行催化转化具有实现这一目的的潜力。在这一贡献中，我们证明了在单暴露于ppm量的可溶性氯化物源的情况下，在掺杂铜的多孔金属氧化物催化剂上乙醇缩合中的显着选择性变化。如果没有这种修改中，乙酸乙酯是主要产物，与其他的是Ñ-丁醇（主要）加一些1-己醇，乙酸丁酯和丁酸乙酯。一次暴露于氯化物可增加活性，更重要的是，显着改变其选择性，从而使正丁醇和1-己醇成为最大的产物。反应前和反应后的X射线衍射和碱度测量用于检查氯化物如何改变这种通过煅烧Cu掺杂的Mg / Al水滑石而制备的地球上富集的催化剂的性能。

更新日期：2018-10-17

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