The effects of TiO2 crystal-plane-dependent Ir-TiOx interactions on the selective hydrogenation of crotonaldehyde over Ir/TiO2 catalysts
The effects of TiO2 crystal-plane-dependent Ir-TiOx interactions on the selective hydrogenation of crotonaldehyde over Ir/TiO2 catalysts
复制标题
TiO2 晶面依赖性 Ir-TiOx 相互作用对 Ir/TiO2 催化剂上巴豆醛选择性加氢的影响
DOI：
10.1016/s1872-2067(21)63810-x
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发表时间：
2021
影响因子：
16.5
通讯作者：
Huang Weixin
中科院分区：
文献类型：
--
作者：
Jia Aiping;Zhang Yunshang;Song Tongyang;Hu Yiming;Zheng Wanbin;Luo Mengfei;Lu Jiqing;Huang Weixin
Three supported Ir/TiO2catalysts, containing anatase TiO2nanocrystals with predominantly exposed {101}, {100}, and {001} planes, were subjected to various pre-treatments (H2reduction at different temperatures and O2re-oxidation) and then tested in the vapor phase selective hydrogenation of crotonaldehyde. The pre-treatments significantly altered the Ir-TiOxinteractions, including the morphologies and electronic properties of the Ir species and their surface acidity. These interactions were also closely related to the crystal planes of TiO2, which further supported the observed reaction behaviors of the various Ir/TiO2catalysts. The best performance was obtained using the Ir/TiO2-{101} catalyst pre-reduced at 300 °C, owing to its higher Ir0surface concentration and moderate surface acidity compared to the other catalysts. Moreover, these findings indicated the synergistic role of the Ir-TiOxinterface in the reaction, as the interfacial sites were responsible for the adsorption/activation of H2and the C=O bond in the crotonaldehyde molecule. However, pre-reduction at 400 °C resulted in partial encapsulation of the Ir particles by TiOxviastrong metal-support interactions, which is unfavorable for the catalytic reaction owing to the loss of Ir-TiOxinterfacial sites.
