The promoting effect of copper and silver on catalytic performance of MgO–SiO₂ oxide systems for ethanol-to-butadiene (ETB) process has been studied with an aqueous ethanol as a feed. The relationship between acid–base characteristics and catalytic properties of (Cu, Ag)/MgO–SiO₂ modified systems in ETB-process is discussed and the differences in the effects of copper and silver are shown based on the measurements of temperature-programmed surface reaction of ethanol. The modification of MgO–SiO₂ with copper and silver contributes to a significant increase in 1,3-butadiene yield, as well as the yields of ethylene, butenes and residual intermediate product, acetaldehyde. This is caused by the formation of active sites for ethanol dehydrogenation and [Mg–O–Cu(Ag)] acid–base sites for the reactions of aldol-croton condensation of acetaldehyde with the formation of 1,3-butadiene and butenes, as well as ethanol dehydration.

Graphic Abstract

中文翻译：

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铜和银对水乙醇制 1,3-丁二烯 MgO-SiO2 体系催化性能的影响

以乙醇水溶液为原料，研究了铜和银对乙醇制丁二烯 (ETB) 工艺中 MgO-SiO ₂氧化物体系催化性能的促进作用。讨论了 ETB 工艺中 (Cu, Ag)/MgO-SiO ₂改性体系的酸碱特性与催化性能之间的关系，并基于程序升温表面的测量显示了铜和银的影响差异乙醇反应。MgO-SiO ₂的改性铜和银有助于显着提高 1,3-丁二烯产率，以及乙烯、丁烯和残留中间产物乙醛的产率。这是由于乙醇脱氢的活性位点和乙醛醇醛-巴豆缩合反应生成 1,3-丁二烯和丁烯的 [Mg-O-Cu(Ag)] 酸碱位点的形成造成的，如以及乙醇脱水。

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