Pt/TiH<sub>2</sub> Catalyst for Ionic Hydrogenation via Stored Hydrides in the Presence of Gaseous H<sub>2</sub>
作者:Qifan Wu、Chao Zhang、Masahiko Arai、Bin Zhang、Ruhui Shi、Peixuan Wu、Zhuangqing Wang、Qiang Liu、Ke Liu、Weiwei Lin、Haiyang Cheng、Fengyu Zhao
DOI:10.1021/acscatal.9b00917
日期:2019.7.5
adsorption of CAL with its carbonyl group. Furthermore, the carbonyl group was hydrogenated by hydride species (H+, H–) supplied from the support and the hydride species consumed were compensated from gaseous dihydrogen; hydrogen atoms were formed by ordinary homolytic cleavage on Pt and then these hydrogen atoms moved onto the surface of TiH2 and diffused into the bulk of the support, during which those
的Pt / TIH 2催化剂具有氢的储存和释放能力进行了研究用于选择性氢化反-cinnamaldehyde(CAL)到肉桂醇(COL)与气态二氢。就产物选择性和氢化机理而言,该催化剂的催化行为与参考Pt / TiO 2催化剂明显不同。Pt / TiH 2催化剂在CAL转化率为98%时显示出97%的COL选择性,这归因于Pt晶体-载体边界层的功能,该边界层导致CAL优先被其羰基吸附。此外,羰基的氢化物物种(H氢化+,H -)从载体中提供,消耗的氢化物通过气态二氢得到补偿;的氢原子被普通均裂在Pt形成,然后将这些氢原子移动到载通的表面2和扩散到本体的支持,在此期间,那些同时改变到氢化物种(H +,H - )经由电子转移与钛物种和其中的氢化物空位。氢原子从Pt到TiH 2载体的表面和整体扩散应该是主要步骤,而不是将它们加到CAL的羰基上(常规氢化)。即,在气态二氢存在下,Pt / TiH 2发生离子氢化。