The dry reforming of methane (DRM) reaction holds significance for efficient conversion of CH₄ and CO₂ into syngas for the subsequent production of premium fuels and high-value chemicals. However, catalyst deactivation is easily caused by carbon deposition over Ni-based catalysts. Here, we investigated the effects of ultrasmall CeO₂ nano-islands on the DRM reaction and found a strong volcano-type relationship between CeO₂ content and reaction activity over Ni/CeO₂-SiO₂ catalysts. A suitable CeO₂ amount can only slightly suppress CH₄ dissociation but largely promote carbon species elimination. More importantly, the presence of these CeO₂ nano-islands positively affected the types and location of coke species by “carbon-phobic effect” and thus alleviated coverage of Ni active sites. As a result, a higher TOF_CH4 was obtained by an increase of about 82% and a continuous 2,000-h run almost without any side reaction, and deactivation was achieved along with CO₂ and CH₄ conversions at about 96% and 92%, respectively.

中文翻译：

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通过调节 Ni/CeO2-SiO2 催化剂上的 Ni-CeO2 相互作用对甲烷进行干重整的强活性火山型关系


甲烷干重整 （DRM） 反应对于将 CH₄ 和 CO₂ 有效转化为合成气，用于随后生产优质燃料和高价值化学品具有重要意义。然而，催化剂失活很容易由镍基催化剂上的碳沉积引起。在这里，我们研究了超小 CeO₂ 纳米岛对 DRM 反应的影响，发现 CeO₂ 含量与 Ni/CeO_{2-SiO 2} 催化剂的反应活性之间存在很强的火山型关系。适量的 CeO₂ 只能略微抑制 CH₄ 解离，但在很大程度上促进碳物质的消除。更重要的是，这些 CeO₂ 纳米岛的存在通过“疏碳效应”对焦炭种类的类型和位置产生了积极影响，从而减轻了 Ni 活性位点的覆盖率。结果，通过增加约 82% 和连续运行 2,000 小时，几乎没有任何副反应，获得了更高的 TOF_CH4，并且分别以约 96% 和 92% 的 CO₂ 和 CH₄ 转化率实现了失活。