Noble Metal-free Bimetallic Cobalt/Manganese Oxide Catalyst for Hydrogen Generation by Decomposition of Hydrous Hydrazine

摘要

Bimetallic cobalt and manganese oxide(Co/MnO)is prepared by annealing the spinel structure of CoMn2O4 under hydrogen environment.This noble metal-free catalyst is applied for hydrogen generation from aqueous hydrazine solution.X-ray powder diffraction,transmission electron microscopy,energy-dispersive spectroscopy,and X-ray photoelectron spectroscopy results indicated that the phase separation of metallic cobalt and manganese monoxide from CoMn2O4 occurs during annealing process.Co/MnO exhibits catalytic activity with the TOF value of 14.2 h~(-1)and 100% selectivity without generation of ammonia at 343 K.It is found that metallic cobalt plays role on the active site for hydrogen generation.