In recent decades, there has been notable interest in understanding the influence of the support composition on the reactivity of gold species in oxidation processes. This study fits in with this scientific trend and investigates the effects of incorporating phosphate ions into Au catalysts supported on mixed iron-niobium oxides in methanol oxidation. All materials were thoroughly characterized using XRD, ICP-OES, DR-UV-Vis, N physisorption, HRTEM, HAADF-STEM, SEM-EDX, XPS, TPD-NH, TPD-CO, and FTIR combined with adsorption of NO. Activity of the catalysts was evaluated using a fixed-bed flow reactor combined with gas chromatography and FTIR-MS system. It was observed that the phosphate-doped catalyst supported on mixed Fe-Nb oxide exhibited significantly higher activity than phosphate-free sample. This improvement resulted from increased electron mobility, enhanced acidity, and optimized distribution of gold nanoparticles on the former catalyst. Knowledge resulting from this work can lead to the development of more efficient gold catalysts.

中文翻译：

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揭示磷酸盐掺杂对混合铁铌氧化物负载金在气相甲醇氧化中的表面性质和催化活性的影响


近几十年来，人们对了解载体成分对氧化过程中金物质反应性的影响产生了浓厚的兴趣。本研究顺应了这一科学趋势，研究了将磷酸根离子掺入混合铁铌氧化物负载的金催化剂中对甲醇氧化的影响。使用 XRD、ICP-OES、DR-UV-Vis、N 物理吸附、HRTEM、HAADF-STEM、SEM-EDX、XPS、TPD-NH、TPD-CO 和 FTIR 以及 NO 吸附相结合对所有材料进行了彻底表征。使用固定床流动反应器结合气相色谱和 FTIR-MS 系统评估催化剂的活性。观察到负载在混合 Fe-Nb 氧化物上的磷酸盐掺杂催化剂表现出比不含磷酸盐的样品显着更高的活性。这种改进源于电子迁移率的提高、酸度的增强以及金纳米颗粒在前催化剂上的优化分布。这项工作产生的知识可以促进更有效的金催化剂的开发。