水气转移反应的碳化物支持的Au催化剂:强金属支持相互作用效应的新领域
Jinhu Dong1,2, Qiang Fu1, Zheng Jiang3
1State Key Laboratory of Catalysis, iChEM , Dalian Institute of Chemical Physics, Chinese Academy of Sciences , Dalian 116023 , China.
Journal of the American Chemical Society
|October 4, 2018
概括
碳化上的金纳米颗粒表现出强烈的金属支相互作用 (SMSI),增强低温水气转移反应 (LT-WGSR) 的活性. 在金属/碳化物催化剂中,这种SMSI状态是可逆的,开辟了新的催化可能性.
科学领域:
- 不同质的催化
- 材料科学
- 表面化学
背景情况:
- 强金属支相互作用 (SMSI) 在异质催化中至关重要,通常在金属/氧化物系统中进行研究.
- 在金属/碳化物催化剂中SMSI的作用在很大程度上尚未被探索.
- 了解SMSI是设计先进催化材料的关键.
研究的目的:
- 调查SMSI在黄金/碳化物 (Au/MoC_x) 催化剂中的存在和影响.
- 探索 Au/MoC_x 系统中接口电子状态和催化活动之间的关系.
- 证明SMSI在金属/碳化物催化剂中的可调性.
主要方法:
- Au/MoC_x催化剂的合成
- 催化剂结构,分散和电子性质的表征.
- 在低温水气转移反应 (LT-WGSR) 中对催化活性进行评估.
- 碳化与氧化催化剂状态的比较研究.
主要成果:
- 碳化Au/MoC_x催化剂表现出高度分散的黄金覆盖层和强大的界面电荷转移,表明SMSI状态活跃.
- 这些活跃的SMSI催化剂表现出色的LT-WGSR性能.
- 氧化处理导致金纳米粒子聚合,电子相互作用减弱,LT-WGSR活动减少.
- 催化剂接口状态通过碳化和氧化循环在活性SMI和非活性状态之间可逆切换.
结论:
- 这项研究表明,在黄金/化碳催化剂中,通过碳化诱导的SMSI效应.
- 这些发现突显了金属/碳化物接口对SMSI现象的潜力.
- 由于SMSI状态的可逆性,为设计和控制催化过程提供了新的途径.
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