Back Cover: Butanal Condensation Chemistry Catalyzed by Brønsted Acid Sites on Polyoxometalate Clusters (ChemCatChem 2/2017)

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• 作者：Dr. Yifei Yang ; Fan Lin ; Prof. Honghi Tran and Prof. Ya-Huei (Cathy) Chin
• 刊名：ChemCatChem
• 出版年：2017
• 出版时间：January 23, 2017
• 年：2017
• 卷：9
• 期：2
• 页码：373
• 全文大小：3017K
• ISSN：1867-3899

文摘

The Cover shows butanal condensation reaction on polyoxometalate clusters (H₄SiW₁₂O₄₀), grafted on mesoporous silica, as a catalytic route for upgrading the aldehydes derived from biomass feedstocks. The reaction creates an intermolecular C=C bond, ejects oxygen heteroatoms and produces larger, unsaturated aldehydes (e.g., 2-ethyl-2-hexenal).In their Full Paper, Y. Yang et al. describe the catalytic fate of butanal during its deoxygenation sojourns on polyoxometalate clusters. The Brønsted acid sites (H⁺) of polyoxometalate clusters protonate the butanals and then catalyze predominantly the C=C bond formation through an aldol condensation mechanism. Thus, the rate of C=C bond formation is directly proportional to the H⁺ site density. A portion of the protonated butanals reacts with framework oxygen atoms, forming surface acetates as spectators that poison the H⁺ sites. This work establishes the connection among the active site function, identity of adsorbed species and rates. More information can be found in the Full Paper by Y. Yang et al. on page 287 in Issue 2, 2017 (DOI: 10.1002/cctc.201601042).