脱氢
纳米材料基催化剂
双金属片
催化作用
甲酸
格式化
氢
化学
无机化学
氢气储存
材料科学
氢燃料
活化能
化学工程
物理化学
有机化学
工程类
作者
Qiming Sun,Benjamin W. J. Chen,Ning Wang,Qian He,Albert M. Chang,Chia-Min Yang,Hiroyuki Asakura,Tsunehiro Tanaka,Max J. Hülsey,Chi-Hwa Wang,Jihong Yu,Ning Yan
标识
DOI:10.1002/anie.202008962
摘要
A CO2 -mediated hydrogen storage energy cycle is a promising way to implement a hydrogen economy, but the exploration of efficient catalysts to achieve this process remains challenging. Herein, sub-nanometer Pd-Mn clusters were encaged within silicalite-1 (S-1) zeolites by a ligand-protected method under direct hydrothermal conditions. The obtained zeolite-encaged metallic nanocatalysts exhibited extraordinary catalytic activity and durability in both CO2 hydrogenation into formate and formic acid (FA) dehydrogenation back to CO2 and hydrogen. Thanks to the formation of ultrasmall metal clusters and the synergic effect of bimetallic components, the PdMn0.6 @S-1 catalyst afforded a formate generation rate of 2151 molformate molPd-1 h-1 at 353 K, and an initial turnover frequency of 6860 mol H2 molPd-1 h-1 for CO-free FA decomposition at 333 K without any additive. Both values represent the top levels among state-of-the-art heterogeneous catalysts under similar conditions. This work demonstrates that zeolite-encaged metallic catalysts hold great promise to realize CO2 -mediated hydrogen energy cycles in the future that feature fast charge and release kinetics.
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