A series of nickel-platinum catalysts supported on gamma alumina (${\text{γ-Al}}_2{\mathrm{O}}_3$) with small, increasing amounts of Pt promoter were precisely prepared by electroless deposition at 5.0 wt% Ni and with compositions up to 2.8 wt% Pt (one theoretical monolayer of Pt on Ni) and evaluated for the dry reforming of methane. Characterization was performed using x-ray diffraction, temperature programmed reduction, scanning transmission electron microscopy, and temperature programmed oxidation. At temperatures below 600 °C, activity of bimetallic samples exhibited a maximum at 0.4 monolayers Pt and surpassed that of unpromoted Ni. At 700 °C, deactivation occurred for all samples. X-ray diffraction patterns of the high-temperature treated catalysts indicated segregation of the Ni-Pt alloys. Pt showed no influence on hydrogen selectivity, which was driven by thermodynamic limits.

一系列载于γ-氧化铝上的镍铂催化剂（${\text{γ-铝}}_{\mathrm{2个}}{\mathrm{Ø}}_3$通过在5.0 wt％的Ni上进行化学沉积并组成高达2.8 wt％的Pt（Ni上一层Pt的理论单层）的化学沉积来精确制备具有少量，增加量的Pt助催化剂，并评估了甲烷的干重整。使用X射线衍射，程序升温还原，扫描透射电子显微镜和程序升温氧化进行表征。在低于600°C的温度下，双金属样品的活性在0.4单层Pt处表现出最大值，并超过未促进的Ni。在700°C下，所有样品均失活。高温处理的催化剂的X射线衍射图表明Ni-Pt合金偏析。Pt对氢选择性没有影响，氢选择性是由热力学极限驱动的。