用于巴豆醛液相选择性加氢的高性能Ir/WO_(3)催化剂  

High performance Ir/WO_(3) catalysts for liquid phase selective hydrogenation of crotonaldehyde

作　　者：郑万彬 胡一鸣 汤岑 李艳明 罗孟飞[1] 鲁继青[1] ZHENG Wanbin;HU Yiming;TANG Cen;LI Yanming;LUO Mengfei;LU Jiqing(College of Chemistry and Life Sciences,Zhejiang Normal University,Jinhua 321004,China;Library of Zhejiang Normal University,Jinhua 321004,China)

机构地区：[1]浙江师范大学化学与生命科学学院,浙江金华321004 [2]浙江师范大学图文信息中心,浙江金华321004

出　　处：《浙江师范大学学报（自然科学版）》2022年第1期51-58,共8页Journal of Zhejiang Normal University:Natural Sciences

基　　金：国家自然科学基金资助项目(21773212;21643007)。

摘　　要：为研究催化剂对巴豆醛液相选择性加氢的作用,制备了一系列具有不同金属负载量的Ir/WO_(3)催化剂.利用XRD,TEM,H_(2)-TPR,XPS等手段表征了上述材料的结构、形貌及化学特性.结果表明:Ir/WO_(3)催化剂表面较高的表面酸量和较强的金属与载体相互作用力是催化剂活性提高的主要原因;不同Ir含量的Ir/WO_(3)催化剂的转化频率相同,表明在所考察的Ir颗粒范围内(2~3 nm),该反应为非结构敏感型反应.研究为理解金属载体相互作用及颗粒尺寸效应对反应行为的影响提供了实验证据.A series of supported Ir/WO_(3)catalysts with different Ir contents were prepared and tested for liquid phase selective hydrogenation of crotonaldehyde.It was found that compared to the SiO_(2) and MgO supports,the supported Ir/WO_(3)catalysts were much more active and selective,with a crotonaldehyde conversion of 67%and a crotyl alcohol selectivity of 87%.Characterizations revealed that the improved performance of the Ir/WO_(3)catalyst was related to its high surface acidity and strong metal-support interaction.In addition,it was found that the turnover frequencies of the Ir/WO_(3)catalysts were similar in spite of different Ir contents,indicated that the reaction was structure insensitive in the employed Ir particle sizes of 2~3 nm.The study provided experimental evidence for understanding the influence of metal-support interaction and particle size effects on reaction behavior.

关 键 词：α β-不饱和醛 选择性加氢 表面酸性 金属载体相互作用 颗粒尺寸效应 

分 类 号：O643.32[理学—物理化学]