Strong metal-support interaction (SMSI) has been regarded as one of the most important concepts in heterogeneous catalysis, which has been almost exclusively discussed in metal/oxide catalysts. Here, we show that gold/molybdenum carbide (Au/MoC x) catalysts feature highly dispersed Au overlayers, strong interfacial charge transfer between metal and support, and excellent activity in the low-temperature water-gas shift reaction (LT-WGSR), demonstrating the active SMSI state. Subsequent oxidation treatment results in strong aggregation of Au nanoparticles, weak interfacial electronic interaction, and poor LT-WGSR activity. The two interface states can be transformed into each other by alternative carbonization and oxidation treatments. This work reveals the active SMSI effect in metal/carbide catalysts induced by carbonization, which opens a new territory for this important concept.

中文翻译：

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用于水煤气变换反应的碳化物负载的金催化剂：强金属-载体相互作用的新领域

强金属-载体相互作用（SMSI）被认为是多相催化中最重要的概念之一，几乎只在金属/氧化物催化剂中讨论过。在这里，我们展示了金/碳化钼 (Au/MoC x) 催化剂具有高度分散的 Au 覆盖层、金属和载体之间强大的界面电荷转移以及在低温水煤气变换反应 (LT-WGSR) 中的优异活性，演示活动的 SMSI 状态。随后的氧化处理导致 Au 纳米颗粒的强聚集、弱界面电子相互作用和较差的 LT-WGSR 活性。两种界面态可以通过交替的碳化和氧化处理相互转化。这项工作揭示了碳化诱导的金属/碳化物催化剂中的活性 SMSI 效应，