Abstract We found experimental evidence that shows the effect that adsorbed hydrogen can have on CO dissociation. For cobalt nanoparticles supported on SiO2, adsorbed hydrogen enhances CO dissociation. In contrast, adsorbed hydrogen inhibits CO dissociation on a cobalt film supported on SiO2. Considering the nature of cobalt deposited by physical vapor deposition, these results can be explained by a preference for CO dissociation to follow the hydrogen-assisted dissociation mechanism on FCC cobalt and step-edges, while the direct dissociation mechanism is preferred on HCP cobalt. These results are in agreement with previous theoretical results.

中文翻译：

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模型 Co/SiO2 催化剂上的 CO 离解 - 吸附氢的影响

摘要 我们发现了实验证据，表明吸附的氢会对 CO 解离产生影响。对于负载在 SiO2 上的钴纳米粒子，吸附的氢增强了 CO 的解离。相比之下，吸附的氢抑制了负载在 SiO2 上的钴膜上的 CO 离解。考虑到通过物理气相沉积沉积的钴的性质，这些结果可以通过优先选择 CO 解离遵循 FCC 钴和阶梯边缘的氢辅助解离机制来解释，而直接解离机制在 HCP 钴上更受欢迎。这些结果与先前的理论结果一致。