Ethanol steam reforming over Ni/Ni_xMg_(1-x)O: Inhibition of surface nickel species diffusion into the bulk

摘要

This paper describes a study regarding the effect of Ni addition to Ni_xMg_(1-x)O solid solutions on the catalytic performances of ethanol steam reforming for hydrogen production. Nickel nanoparticles supported on Ni_xMg_(1-x)O demonstrated higher conversion of ethanol and yields of hydrogen than the bare support. We correlated the improved performances of Ni-based catalysts with the reducibility of nickel species. The addition of Ni to the solid solution support produced more easily reducible surface nickel species. Higher content of bulk nickel species in the support could inhibit the surface nickel species from diffusing into the bulk, leading to more surface nickel species that is easily reducible to its active form.