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Mechanistic Insight into Size-Dependent Activity and Durability in Pt/CNT Catalyzed Hydrolytic Dehydrogenation of Ammonia Borane

Chen Wenyao, Ji Jian, Feng Xiang, Duan Xuezhi, Qian Gang, Li Ping, Zhou Xinggui, Chen De, Yuan Weikang
Journal of the American Chemical Society 2014 v.136 no.48 pp. 16736-16739
adsorption, ammonia, catalysts, dehydrogenation, durability, hydrogen production, models, particle size, platinum
We report a size-dependent activity in Pt/CNT catalyzed hydrolytic dehydrogenation of ammonia borane. Kinetic study and model calculations revealed that Pt(111) facet is the dominating catalytically active surface. There is an optimized Pt particle size of ca. 1.8 nm. Meanwhile, the catalyst durability was found to be highly sensitive to the Pt particle size. The smaller Pt particles appear to have lower durability, which could be related to more significant adsorption of B-containing species on Pt surfaces as well as easier changes in Pt particle size and shape. The insights reported here may pave the way for the rational design of highly active and durable Pt catalysts for hydrogen generation.