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

机译：在ZnO和TiO2上乙醇转化期间Au催化剂停用的差异

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摘要

Au nanoparticles of different sizes were supported by the deposition-precipitation method on two metal oxides: ZnO and TiO2. 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 TiO2 favors the formation of smaller nanoparticles, ZnO offers larger Au particle sizes when prepared under similar conditions. At the same time, TiO2 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：不同尺寸的Au纳米颗粒通过两种金属氧化物上的沉积沉淀方法支持：ZnO和TiO 2。在乙醇催化转化反应中测试所得催化剂。金属氧化物载体材料两者都对实现的Au粒度以及随后的催化剂的行为产生了不同的影响，关于其初始转化值，产品分布和稳定性。虽然TiO2有利于形成较小的纳米颗粒，但ZnO在类似条件下制备时提供较大的Au粒子尺寸。同时，即使在观察具有类似颗粒尺寸的每个系列的催化剂时，TiO 2产生催化剂，其与Auzno催化剂相比，与Auzno催化剂相比。同时，ZnO上负载的催化剂表现出焦炭形成引起的更高抗性的抗性。可以证明这些结果在使用的和新鲜催化剂样品上采用不同的表征技术。失活的下降通常伴随着催化剂表面上的碳含量的增加。

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