Gold nanocatalysts, active in several oxidation reactions, suffer of insufficient time-on-stream stability. The easiest way to solve this problem is modifying the support, due to metal-support interaction. This study compares modifying effects of MgO and La₂O₃ on textural, electronic, and catalytic properties of Au nanoparticles (NPs) supported on inert nanostructured SiO₂ in CO oxidation and liquid phase 1-octanol oxidation. Modification of the silica support surface with La and Mg increased metal support interaction, leading to gold particles with primary size of 1 nm but with different stability: stable under different pretreatment conditions on Mg-modified samples but highly sensible to the pretreatments on La-modified samples. Both modifiers changed electronic properties of supported gold favoring formation and stabilization of Auδ⁺ states, which are probable gold active sites in catalytic redox processes. Modification with La and Mg oxides changed catalytic properties in CO oxidation before and after pretreatment in H₂ at 300 °C for 1 h. Gold catalysts supported on La- and Mg-modified silica showed similar performance in 1-octanol oxidation with higher conversion than unmodified Au/SiO₂. La and Mg showed better promoting effects of catalytic properties in this reaction than redox modifiers (Fe and Ce) supported on small SiO₂ particles.

在多种氧化反应中具有活性的金纳米催化剂，其运行时间稳定性不足。解决此问题的最简单方法是修改支撑，因为金属与支撑之间会发生相互作用。这项研究比较了MgO和La ₂ O ₃对惰性纳米结构SiO ₂负载的Au纳米颗粒（NPs）的质构，电子和催化性能的改性作用。在CO氧化和液相1-辛醇氧化中 用La和Mg改性二氧化硅载体表面会增加金属载体之间的相互作用，导致金颗粒的主要尺寸为1 nm但具有不同的稳定性：在不同的预处理条件下对Mg改性的样品稳定，但对La改性的预处理高度敏感样品。两种改性剂均改变了负载型金的电子性质，有利于Auδ ⁺态的形成和稳定，这是催化氧化还原过程中可能的金活性位点。La和Mg氧化物的改性改变了H _2中预处理前后的CO氧化催化性能。在300°C下放置1小时。在La和Mg改性的二氧化硅上负载的金催化剂在1-辛醇氧化中表现出相似的性能，其转化率高于未改性的Au / SiO ₂。与负载在较小SiO ₂颗粒上的氧化还原改性剂（Fe和Ce）相比，La和Mg在该反应中显示出更好的催化性能促进作用。