Photochemical route for synthesizing atomically dispersed palladium catalysts

作者：Pengxin Liu, Yun Zhao, Ruixuan Qin, Shiguang Mo, Guangxu Chen, Lin Gu, Daniel M. Chevrier, Peng Zhang, Qing Guo, Dandan Zang, Binghui Wu, Gang Fu, Nanfeng Zheng · 发表于：Science · 年份：2016 · DOI：10.1126/science.aaf5251 · 被引用次数：2021 · 研究领域：Catalytic Processes in Materials Science、Catalysis and Oxidation Reactions、Electrocatalysts for Energy Conversion

Atomically dispersed noble metal catalysts often exhibit high catalytic performances, but the metal loading density must be kept low (usually below 0.5%) to avoid the formation of metal nanoparticles through sintering. We report a photochemical strategy to fabricate a stable atomically dispersed palladium-titanium oxide catalyst (Pd1/TiO2) on ethylene glycolate (EG)-stabilized ultrathin TiO2 nanosheets containing Pd up to 1.5%. The Pd1/TiO2 catalyst exhibited high catalytic activity in hydrogenation of C=C bonds, exceeding that of surface Pd atoms on commercial Pd catalysts by a factor of 9. No decay in the activity was observed for 20 cycles. More important, the Pd1/TiO2-EG system could activate H2 in a heterolytic pathway, leading to a catalytic enhancement in hydrogenation of aldehydes by a factor of more than 55.