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Difference in the deactivation of Au catalysts during ethanol transformation when supported on ZnO and on TiO2

机译：负载在ZnO和TiO2上的乙醇转化过程中Au催化剂失活的差异

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Au nanoparticles of different sizes were supported by the deposition–precipitation method on two metal oxides: ZnO and TiO _(2) . 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 _(2) favors the formation of smaller nanoparticles, ZnO offers larger Au particle sizes when prepared under similar conditions. At the same time, TiO _(2) 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.
机译：通过沉积-沉淀方法在两种金属氧化物ZnO和TiO_（2）上支撑了不同尺寸的Au纳米颗粒。在乙醇催化转化反应中测试所得催化剂。两种金属氧化物载体材料就其初始转化率值，产物分布和稳定性而言，对所获得的Au粒度以及随后的催化剂的行为均具有不同的影响。尽管TiO_（2）有利于形成较小的纳米颗粒，但在相似条件下制备时，ZnO提供较大的Au粒径。同时，TiO_（2）产生的催化剂与AuZnO催化剂相比显示出更高的初始转化率，即使观察到每个系列具有相似粒径的催化剂也是如此。同时，负载在ZnO上的催化剂对由焦炭形成引起的失活表现出更高的抵抗力。这些结果证明了对二手和新鲜催化剂样品采用不同的表征技术。失活的下降通常伴随着催化剂表面碳含量的增加。

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