By-product co-feeding reveals insights into the role of zinc on methanol synthesis catalysts

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• 作者：Marta Santiago^a ; Katia Barbera^a ; Cristina Ferreira^b ; Daniel Curulla-Ferré ; ^b ; Peter Kolb^c ; Javier Pé ; rez-Ramí ; rez^a ; ^{jpr@chem.ethz.ch}
• 关键词：Methanol synthesis ; By-product co-feeding ; Methyl formate ; Dimethyl ether ; Zinc oxide
• 刊名：Catalysis Communications
• 出版年：2012
• 出版时间：5 May, 2012
• 年：2012
• 卷：21
• 期：Complete
• 页码：63-67
• 全文大小：526 K

文摘

Co-feeding of two relevant by-products of methanol synthesis, viz. dimethyl ether and methyl formate, in CO + H₂ and CO + CO₂ + H₂ streams was used as a strategy to gain understanding of the reaction over ternary Cu/ZnO/Al₂O₃ and binary Cu/ZnO, Cu/Al₂O₃, and ZnO/Al₂O₃ catalysts. While dimethyl ether does not participate in the process, the addition of methyl formate remarkably increases the MeOH production by its oxygen-assisted split into active intermediate species (CH₃O^{?/sup> and HCOO?/sup>). Specifically, a breakthrough role was assigned to ZnO as catalytic partner for methyl formate conversion to methanol, since even the Cu-free ZnO/Al₂O₃ sample shows a considerable MeOH yield on MeF co-feeding. Alternatively, in the Zn-free Cu/Al₂O₃ sample, the presence of carbon dioxide in the inlet mixture was crucial to activate the methyl formate conversion path, likely because CO₂ provides readily available oxygen to the Cu surface.}