Direct Conversion of Bio-ethanol to Isobutene on Nanosized ZnxZryOz Mixed Oxides with Balanced Acid鈥揃ase Sites

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• 作者：Junming Sun ; Kake Zhu ; Feng Gao ; Chongmin Wang ; Jun Liu ; Charles H. F. Peden ; Yong Wang
• 刊名：Journal of the American Chemical Society
• 出版年：2011
• 出版时间：July 27, 2011
• 年：2011
• 卷：133
• 期：29
• 页码：11096-11099
• 全文大小：764K
• 年卷期：v.133,no.29(July 27, 2011)
• ISSN：1520-5126

文摘

We report the design and synthesis of nanosized Zn_xZr_yO_z mixed oxides for direct and high-yield conversion of bio-ethanol to isobutene (83%). ZnO is addded to ZrO₂ to selectively passivate zirconia鈥檚 strong Lewis acidic sites and weaken Br枚nsted acidic sites, while simultaneously introducing basicity. As a result, the undesired reactions of bio-ethanol dehydration and acetone polymerization/coking are suppressed. Instead, a surface basic site-catalyzed ethanol dehydrogenation to acetaldehyde, acetaldehyde to acetone conversion via a complex pathway including aldol-condensation/dehydrogenation, and a Br枚nsted acidic site-catalyzed acetone-to-isobutene reaction pathway dominates on the nanosized Zn_xZr_yO_z mixed oxide catalyst, leading to a highly selective process for direct conversion of bio-ethanol to isobutene.