Developing an environmentally friendly and highly efficient catalyst is crucial for generating clean hydrogen without COx and structured carbon. The catalytic decomposition of methane encourages technology to convert natural gas into these valuable products. For this purpose, surface defects in activating CH4 have garnered much interest in developing silica-supported nickel catalysts by maintaining active sites and modulating metal-support interaction (MSI). Thus, It is shown here that the presence of Mn improved the reducibility of superficial NiO and created a moderate interaction between Ni and the support, decreasing the electron density around the Ni atom and elevating surface oxygen species’ presence by introducing lattice defects, thus facilitating the reduction, promoting the dissociation of methane on the nickel surface and enhancing the reactivity of the reaction Consequently, this MSI modulate stabilized the active sites, preventing quick sintering under reaction conditions. Based on TEM analysis, the surface morphology revealed well-dispersed metallic Ni and the restriction of Ni crystal growth. The strong metal-support interaction resulted in a high carbon diffusion driving force, providing more sites for growth in carbon nanofiber (CNFs). Maintaining the balance between the infiltration of dissolved carbon and the expansion of CNFs while also preventing the deactivation of the catalyst due to the covering of active sites by channeling carbon deposits towards the edges of the active sites and oxidation of coke produced by active oxygen species, all showed the effective presence of manganese in the catalyst’s configuration.

中文翻译：

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深入了解金属与载体之间的适度相互作用，并加强 Ni/SiO2 基催化剂在热催化甲烷分解中锰集成的效率


开发一种环保且高效的催化剂对于在没有 COx 和结构碳的情况下生产清洁氢气至关重要。甲烷的催化分解鼓励技术将天然气转化为这些有价值的产品。为此，活化 CH4 的表面缺陷引起了人们对通过保持活性位点和调节金属-负载相互作用 （MSI） 来开发二氧化硅负载镍催化剂的浓厚兴趣。因此，这里表明，Mn 的存在提高了表面 NiO 的还原性，并在 Ni 和载体之间产生了适度的相互作用，降低了 Ni 原子周围的电子密度，并通过引入晶格缺陷提高了表面氧的存在，从而促进了还原，促进了镍表面甲烷的解离并增强了反应的反应性因此， 这种 MSI 调节剂稳定了活性位点，防止了反应条件下的快速烧结。基于 TEM 分析，表面形貌揭示了分散良好的金属 Ni 和 Ni 晶体生长的限制。强大的金属-载体相互作用导致了高碳扩散驱动力，为碳纳米纤维 （CNF） 的生长提供了更多位点。保持溶解碳渗透和 CNF 膨胀之间的平衡，同时通过将碳沉积物引导到活性位点的边缘和活性氧产生的焦炭氧化来防止催化剂因活性位点的覆盖而失活，所有这些都表明催化剂构型中锰的有效存在。