Padilla Romen Herrera, Priecel Peter, Lin Ming, Lopez-Sanchez Jose Antonio, Zhong Ziyi
Institute of Chemical and Engineering Sciences (ICES), Agency for Science, Technology and Research (A∗star), 1 Pesek Road, Jurong Island, 627833, Singapore; Stephenson Institute for Renewable Energy, Chemistry Department, The University of Liverpool, Crown Street L69 7ZD, Liverpool, United Kingdom.
Stephenson Institute for Renewable Energy, Chemistry Department, The University of Liverpool, Crown Street L69 7ZD, Liverpool, United Kingdom.
Ultrason Sonochem. 2017 Mar;35(Pt B):631-639. doi: 10.1016/j.ultsonch.2016.01.018. Epub 2016 Jan 18.
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 H-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 10-20s for the deposition. In the AuPd/TiO catalysts series, the AuPd(3:1)/TiO catalyst is the most active for MO photocatalytic degradation; while for PROX reaction, Ru/TiO, Au-Cu/SBA-15 and Pt/γ-AlO 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)/TiO 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.
这项工作旨在开发一种快速高效的策略，用于制备用于催化应用的负载型金属催化剂。采用超声辅助还原沉淀法制备了用于光催化降解甲基橙（MO）和富氢气体中CO优先氧化（PROX）的多相单金属和双金属催化剂。一般来说，与传统方法相比，超声辅助法有三个优点，包括金属纳米颗粒在催化剂载体上的高分散性、比沉积沉淀（DP）法和共沉淀（CP）法高得多的沉积效率（DE）以及非常快速的制备过程，沉积过程仅持续10 - 20秒。在AuPd/TiO催化剂系列中，AuPd(3:1)/TiO催化剂对MO光催化降解最具活性；而对于PROX反应，Ru/TiO、Au - Cu/SBA - 15和Pt/γ - Al₂O₃催化剂非常活跃，最后一种在寿命测试中表现出高稳定性。结构表征表明，在AuPd(3:1)/TiO催化剂中，形成了Au - Pd合金颗粒，且高比例的Au原子位于表面。因此，这种超声辅助方法在制备具有明显结构特征的负载型金属催化剂以用于各种催化应用方面是高效且快速的。
