Morales M V, Asedegbega-Nieto E, Castillejos-López E, Bachiller-Baeza B, Guerrero-Ruiz A
Department of Inorganic Chemistry and Chemical Engineering, UNED Madrid Spain
Institute of Catalysis and Petrochemistry, CSIC Madrid Spain.
RSC Adv. 2018 Feb 15;8(14):7473-7485. doi: 10.1039/c8ra00314a. eCollection 2018 Feb 14.
Au nanoparticles of different sizes were supported by the deposition-precipitation method on two metal oxides: ZnO and TiO. The resulting catalysts were tested in the ethanol catalytic transformation reaction. Both metal oxide support materials exerted a different influence on the achieved Au particle size as well as on the behavior of the subsequent catalyst, with regard to their initial conversion values, product distribution and stability. While TiO favors the formation of smaller nanoparticles, ZnO offers larger Au particle sizes when prepared under similar conditions. At the same time, TiO produced catalysts which displayed higher initial conversions in comparison with AuZnO catalysts, even when observing catalysts of each series with similar particle sizes. At the same time, catalysts supported on ZnO exhibited higher resistance to deactivation caused by coke formation. These results were evidenced employing different characterization techniques on both used and fresh catalyst samples. The decline in deactivation was generally accompanied by an increase in the carbon content on the catalyst's surface.
氧化锌（ZnO）和二氧化钛（TiO₂）。所得催化剂在乙醇催化转化反应中进行了测试。两种金属氧化物载体材料对所获得的金颗粒尺寸以及后续催化剂的性能，在其初始转化率值、产物分布和稳定性方面都产生了不同的影响。虽然二氧化钛有利于形成较小的纳米颗粒，但在相似条件下制备时，氧化锌会提供更大尺寸的金颗粒。同时，二氧化钛制备的催化剂与负载在氧化锌上的金催化剂相比，即使观察每个系列中具有相似颗粒尺寸的催化剂，也表现出更高的初始转化率。同时，负载在氧化锌上的催化剂对由积炭导致的失活表现出更高的抗性。这些结果通过对使用过的和新鲜的催化剂样品采用不同的表征技术得到了证实。失活的下降通常伴随着催化剂表面碳含量的增加。
