A versatile sonication-assisted deposition-reduction method for preparing supported metal catalysts for catalytic applications

详细信息    查看全文

• 作者：Romen Herrera Padilla^a ; ^b ; Peter Priecel^b ; Ming Lin^c ; Jose Antonio Lopez-Sanchez^b ; ^{J.Lopez-Sanchez@liverpool.ac.uk} ; Ziyi Zhong^a ; ^{Zhong_ziyi@ices.a-star.edu.sg}
• 关键词：Sonication ; Supported metal catalyst ; Precipitation&ndash ; reduction ; Photocatalysis ; Preferential oxidation
• 刊名：Ultrasonics Sonochemistry
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：35
• 期：part_PB
• 页码：631-639
• 全文大小：2757 K
• 卷排序：35

文摘

This work aims to develop a rapid and efficient strategy for preparing supported metal catalysts for catalytic applications. The sonication-assisted reduction–precipitation method was employed to prepare the heterogeneous mono- and bi-metallic catalysts for photocatalytic degradation of methyl orange (MO) and preferential oxidation (PROX) of CO in H2-rich gas. In general, there are three advantages for the sonication-assisted method as compared with the conventional methods, including high dispersion of metal nanoparticles on the catalyst support, the much higher deposition efficiency (DE) than those of the deposition–precipitation (DP) and co-precipitation (CP) methods, and the very fast preparation, which only lasts 10–20 s for the deposition. In the AuPd/TiO2 catalysts series, the AuPd(3:1)/TiO2 catalyst is the most active for MO photocatalytic degradation; while for PROX reaction, Ru/TiO2, Au–Cu/SBA-15 and Pt/γ-Al2O3 catalysts are very active, and the last one showed high stability in the lifetime test. The structural characterization revealed that in the AuPd(3:1)/TiO2 catalyst, Au–Pd alloy particles were formed and a high percentage of Au atoms was located at the surface. Therefore, this sonication-assisted method is efficient and rapid in the preparation of supported metal catalysts with obvious structural characteristics for various catalytic applications.