Catalytic hydrogen combustion over supported metal catalysts; comparison and kinetic study

作者：Zohreh Akbari, Mounir Mensi, Emad Oveisi, Jessica Ruffiner, Wen Luo, Cedric David Koolen, Andreas Züttel · 发表于：International Journal of Hydrogen Energy · 年份：2024 · DOI：10.1016/j.ijhydene.2024.08.300 · 被引用次数：20 · 研究领域：Catalytic Processes in Materials Science、Catalysts for Methane Reforming、Catalysis and Oxidation Reactions

Catalytic H 2 combustion (CHC) is an efficient way to mitigate H 2 slip from industrial processes, overcoming the explosion and NO x emission risks. Although Pt-based catalysts are state-of-the-art catalysts, little is known about the CHC catalytic activity of other transition metals (TMs) and their reaction kinetics. Well-dispersed nano-sized M-γAl 2 O 3 (M = Pt, Ru, Co, Ni, Mo) catalysts are synthesized and characterized with spectroscopic and electron microscopy methods. During the CHC reaction, a competitive reaction between O 2 , H 2 and the catalyst is observed, which leads to partial or complete oxidation of the TMs. Stable CHC performance is attained for Ru-γAl 2 O 3 and Co-γAl 2 O 3 catalysts over 45 h. The kinetically controlled region is determined using a new data acquisition approach. The activation energy and pre-exponential factor are compared between M-γAl 2 O 3 catalysts based on the Arrhenius model. This knowledge is highly valued and allows the design of supported catalysts and optimize the CHC reaction in various applications with different requirements. • Synthesis of well-dispersed transition metal catalysts on γAl 2 O 3 support. • Comparison of catalytic H 2 combustion activity of different supported transition metals. • The stable catalytic activity of Ru-γAl 2 O 3 and Co-γAl 2 O 3 over 45 h time on stream. • Determining the kinetic control region for transition metal supported on γAl 2 O 3 catalysts. • Activation energy and pre-exponential factor calc...