Recent progress in use and observation of surface hydrogen migration over metal oxides

Abstract

Hydrogen migration over a metal oxide surface is an extremely important factor governing the activity and selectivity of various heterogeneous catalytic reactions. Passive migration of hydrogen governed by a concentration...

Theoretical prediction by DFT and experimental observation of heterocation-doping effects on hydrogen adsorption and migration over the CeO2(111) surface

“…that NH 3 synthesis in the electric field proceeds via the 'associative mechanism'. 1 The H + over the support reacts with N 2 over the loading metal. Therefore, the reaction rate depends strongly on the amount of metal atoms at the periphery.…”

“…Hydrogen (H) atom adsorption and migration over a metal oxide surface are fundamentally important for various catalytic reactions, as summarized in an earlier review. 1 Many researchers have investigated passive migration of H atoms (i.e. hydrogen spillover) that are useful for hydrogenation and dehydrogenation of hydrocarbons, 2-4 CO 2 reduction [5][6][7] and NH 3 synthesis.…”

Effects of A-site composition of perovskite (Sr1−xBaxZrO3) oxides on H atom adsorption, migration, and reaction

“…These effects, which are broadly studied, are applied to various catalytic reactions. [1][2][3][4] In addition, the active migration of H atoms promotes heterogeneous catalytic reactions. [5][6][7] In such cases, the migration of H atoms on metal oxide surfaces (proton, H + ) induced by an electric eld contributes to cleavage of the rigid bonding in the stable molecules such as N^N bonding (for NH 3 synthesis [8][9][10][11][12] ), and C-H bonding (for steam reforming of CH 4 , [13][14][15] dehydrogenation of methylcyclohexane 16,17 ).…”

Hydrogen Spillover-Driven Low Temperature Synthesis of High-Entropy Alloy Nanoparticles as a Robust Catalyst

“…Hydrogen spillover is a fascinating phenomenon that occurs in sensors, hydrogen storage materials and heterogeneous catalysis. [20][21][22] This process involves the surface migration of dissociated H atoms driven by a concentration gradient. Hydrogen spillover on reducible transition metal oxides such as TiO 2 , WO 3 and MoO 3 proceeds via a set sequence of steps.…”