Ni-based catalyst for dry reforming of methane with high stability

Ni-based catalysts have garnered significant interest in the dry reforming of methane (DRM) due to their cost-effectiveness and notable activity. Via the surface organometallic chemistry (SOMC) method, which has emerged as a powerful tool to synthesize well-defined model catalysts for an array of reactions, we have synthesized size-distributed monometallic Ni nanoparticles (Ni-NPs) on Al2O3 (Ni/Al2O3) which has shown notably high activity and long-term stability. By conducting differential pair distribution function (d-PDF) analysis of X-ray total scattering, and ex situ as well as in situ time-resolved X-ray diffraction (TR-XRD) analysis, we aim to gain insights into how the support stabilizes the small-size Ni-NPs and to identify the Ni speciation under working state. The knowledge obtained above will help to elucidate the origin of the high activity and stability of Ni/Al2O3.

镍基催化剂因其成本效益与显著活性，在甲烷干重整（dry reforming of methane, DRM）中受到广泛关注。通过表面金属有机化学（surface organometallic chemistry, SOMC）方法——该方法已成为合成用于多种反应的结构明确模型催化剂的有力工具——我们在氧化铝（Al₂O₃）上合成了尺寸分布的单金属镍纳米颗粒（Ni-NPs）（即Ni/Al₂O₃催化剂），其表现出极高的活性与长期稳定性。通过对X射线全散射进行差分对分布函数（differential pair distribution function, d-PDF）分析，以及非原位和原位时间分辨X射线衍射（time-resolved X-ray diffraction, TR-XRD）分析，我们旨在深入了解载体如何稳定小尺寸Ni-NPs，并确定其在工作状态下的镍形态。上述获得的知识将有助于阐明Ni/Al₂O₃催化剂高活性与稳定性的起源。