Gold nanoparticles supported on ceria-modified mesoporous–macroporous binary metal oxides as highly active catalysts for low-temperature water–gas shift reaction
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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, N2 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/mTiO2). 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.
KeywordsCeria Gold Catalyst TiZr Binary Metal Oxide Single Metal Oxide
The Joint Research Project between the Commissariat general des relations internationals (CGRI), Belgium and Bulgarian Academy of Sciences (BAS), the Chinese-Bulgarian Scientific and Technological Cooperation Project (2K-11-01/2006), the Belgian Federal Government (Belspo PAI-IAP project, INANOMAT, P6/17), and the National Basic Research Program of China (No. 2009CB623502) supported this work.
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