Gold nanoparticles supported on ceria-modified mesoporous-macroporous binary metal oxides as highly active catalysts for low-temperature water-gas shift reaction

New gold catalytic system prepared on ceria-modified meso-/macroporous binary metal oxide support (CeO2/TiO2-ZrO2) and used as water-gas shift reaction (WGSR) catalyst is reported. The support was prepared through the surfactant templating technique combining with the use of mixed alkoxide solutions. Ceria-modifying additive and gold were deposited consecutively on the meso-/macroporous TiO2-ZrO2 by deposition-precipitation method. The samples were characterized by powder X-ray diffraction, scanning and transmission electron microscopy, N-2 adsorption analysis, and temperature-programmed reduction. The catalytic activity of the new gold-based catalysts was evaluated in WGSR and it was compared with that of gold catalysts supported on simple and binary mesoporous oxides (TiO2, ZrO2, and TiO2-ZrO2) and ceria-modified mesoporous titania support (CeO2/mTiO(2)). A high degree of synergistic interaction between ceria and support and a positive modification of structural and catalytic properties have been achieved. The new gold catalytic system is found to be a promising catalyst for practical WGSR application.