Nickel-ceria has been reported as a very good catalysts for the reforming of methane. Here, the methanol steam reforming reaction on both powder (Ni-CeO₂) and model (Ni-CeO_2-x(111)) catalysts was investigated. The active phase evolution and surface species transformation on powder catalysts were studied via in situ X-ray diffraction (XRD) and diffuse reflectance infrared transform spectroscopy (DRIFTS). Phase transitions of NiO → NiC → Ni and CeO₂ → CeO_2-x were observed during the reaction. The simultaneous production of H₂/CO₂ demonstrates that the active phase of the catalysts contains metallic Ni supported over partially reduced ceria. The DRIFTS experiments indicate that a methoxy to formate transition is associated with the reduction of ceria whereas the formation of carbonate species results from the presence of metallic Ni. A study of the reaction of methanol with Ni-CeO_2-x(111) by X-ray photoelectron spectroscopy (XPS) points to the essential role of metal-support interactions in an oxygen transfer from ceria to Ni that contributes to the high selectivity of the catalysts.

据报道，二氧化铈是甲烷重整的非常好的催化剂。在此，研究了在粉末（Ni-CeO ₂）和模型（Ni-CeO _2-x（111））催化剂上的甲醇蒸汽重整反应。通过原位X射线衍射（XRD）和漫反射红外光谱（DRIFTS）研究了粉末催化剂上的活性相演化和表面物种转化。反应期间观察到NiO→NiC→Ni和CeO ₂  →CeO _2-x的相变。同时生产H ₂ / CO ₂证明了催化剂的活性相含有负载在部分还原的二氧化铈上的金属Ni。DRIFTS实验表明，甲氧基到甲酸的过渡与二氧化铈的还原有关，而碳酸盐物种的形成是由于金属镍的存在而引起的。X射线光电子能谱（XPS）对甲醇与Ni-CeO _2-x（111）反应的研究表明，金属-载体相互作用在二氧化铈向Ni的氧转移中起着重要的作用，这有助于高选择性的催化剂。