Insights on hydride formation over cerium-gallium mixed oxides: A mechanistic study for efficient H₂ dissociation

详细信息    查看全文

• 作者：Julia Vecchietti^a ; Miguel A. Baltan&aacute ; s^a ; Christel Gervais^b ; ^e ; Sebasti&aacute ; n E. Collins^a ; ^f ; Ginesa Blanco^c ; Olivier Matz^d ; Monica Calatayud^d ; ^e ; ^{calatayu@lct.jussieu.fr} ; Adrian Bonivardi^a ; ^f ; ^{abonivar@santafe-conicet.gov.ar}
• 关键词：Hydrogen activation ; Ga2O3 ; CeO2 ; Time-resolved infrared spectroscopy ; DFT ; Alkane dehydrogenation ; Alkyne hydrogenation ; Ceria ; Gallia
• 刊名：Journal of Catalysis
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：345
• 期：Complete
• 页码：258-269
• 全文大小：3118 K
• 卷排序：345

文摘

Mixed gallia-ceria catalysts boost the dissociation of H2. Gallia forms nanodomains embedded in the ceria matrix. GaHGaH hydrides at the interface ceria-gallia are the most reactive toward H2 dissociation. A four-step mechanism explains the observed evolution of IR signals during reaction. DRIFTS, XPS, Ga NMR, DFT and kinetic modeling provide a coherent picture of the mechanism.