Selective Hydrogenation of Crotonaldehyde over Ir–FeOx/SiO2 Catalysts: Enhancement of Reactivity and Stability by Ir–FeOx Interaction

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• 作者：Qin Yu ; Kyoko K. Bando ; Ju-Fang Yuan ; Ce-Qi Luo ; Ai-Ping Jia ; Geng-Shen Hu ; Ji-Qing Lu ; Meng-Fei Luo
• 刊名：Journal of Physical Chemistry C
• 出版年：2016
• 出版时间：April 28, 2016
• 年：2016
• 卷：120
• 期：16
• 页码：8663-8673
• 全文大小：700K
• 年卷期：0
• ISSN：1932-7455

文摘

A series of FeO_x-promoted Ir/SiO₂ catalysts were prepared and tested for gas phase selective hydrogenation of crotonaldehyde. It was found that a catalyst containing Ir nanoparticles contacting with highly dispersed FeO_x clusters (3Ir/0.1Fe/SiO₂) showed excellent activity and stability, with a 5-fold enhanced steady state crotyl alcohol yield (59.6%) compared to that of the bare Ir/SiO₂ (12.4%), while a catalyst promoted with high content of Fe (3Ir/3.5Fe/SiO₂) had high initial activity but deactivated rapidly. A catalyst with similar highly dispersed FeO_x clusters but prepared by an inverse impregnation sequence (0.1Fe/3Ir/SiO₂) also suffered severe deactivation. Various characterizations revealed that the observed behaviors were closely related to the Ir–FeO_x interactions induced by different morphologies of the catalysts. The active sites generated at Ir–FeO_x interface were responsible for the better performance. The catalyst deactivation was attributed to the deposit of heavy compound and strong adsorption of CO on the surface, which was induced by the strong Ir–FeO_x interaction due to heavy decoration of FeO_x on the Ir surface.