Gold nanoparticles supported on ceria-modified mesoporous titania as highly active catalysts for low-temperature water-gas shift reaction

• Published in: Catalysis today Vol. 128; no. 3; pp. 223 - 229
• Main Authors: Idakiev, Vasko, Tabakova, Tatyana, Tenchev, Krassimir, Yuan, Zhong-Yong, Ren, Tie-Zhen, Su, Bao-Lian
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 30.10.2007; Elsevier Science
• Subjects: Catalysis; Ceria additive; Chemistry; Colloidal state and disperse state; Exact sciences and technology; General and physical chemistry; Gold nanoparticles; Low temperature; Mesoporous titania; Physical and chemical studies. Granulometry. Electrokinetic phenomena; Porous materials; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Water-gas shift reaction; Mesoporous titania; Catalysis; Gold nanoparticles; Water-gas shift reaction; Ceria additive; Low temperature; Gold; Catalytic reaction; Support; Nanoparticle; Water gas; Transition element compounds; Transition metal; Nanostructure; Cerium oxide; Porous material; Mesoporosity; Lanthanide compound; Heterogeneous catalysis; Additive; Titanium oxide; Catalyst
• ISSN: 0920-5861; 1873-4308
• DOI: 10.1016/j.cattod.2007.07.016

New gold catalytic system prepared on ceria-modified mesoporous titania (CeMTi) used as water-gas shift (WGS) reaction catalyst is reported. Mesoporous titania (MTi) was synthesized using surfactant templating method through a neutral [C 13(EO) 6–Ti(OC 3H 7) 4] assembly pathway. Ceria modifying additive was deposited on MTi by deposition precipitation (DP) method. Gold-based catalysts with different gold content (1–5 wt.%) were synthesized by DP of gold hydroxide on mixed metal oxide support. The supports and the catalysts were characterized by powder X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), N 2 adsorption analysis and temperature-programmed reduction (TPR). The catalytic behavior of the gold-based catalysts was evaluated in WGS reaction in a wide temperature range (140–300 °C) and at different space velocities and H 2O/CO ratios. The influence of gold content and particle size on the catalytic performance was investigated. The WGS activity of the new gold/ceria-modified mesoporous titania catalysts was compared with that of gold catalysts supported on simple oxides CeO 2 and mesoporous TiO 2, as well as gold/ceria-modified titania and reference catalyst Au/TiO 2 type A (World Gold Council). A high degree of synergistic interaction between ceria and mesoporous titania and a positive modification of structural and catalytic properties by ceria has been achieved. It is clearly revealed that the ceria-modified mesoporous titania is of much interest as potential support for gold-based catalyst. The Au/ceria-modified mesoporous titania catalytic system is found to be efficient catalyst for WGSR.