Ni-Ga and M-Ni-Ga (M = Au, Co, Cu) catalysts were evaluated for methanol synthesis from CO₂ at 10 bar and 200−270 °C. The following trend in turnover frequency (TOF) for CO₂ hydrogenation was observed: AuNiGa > CuNiGa > NiGa > CoNiGa, where TOF increased with decreasing catalyst affinity for CO. The presence of a third metal was found to influence both the formation of the Ni-Ga intermetallic phase as well as the number of available sites for CO chemisorption. Phase formation, catalyst composition and stability were evaluated using therm ogravimetric analysis (TGA), X-ray diffraction (XRD), X-ray fluorescence (XRF), scanning transmission electron microscopy and energy dispersive X-ray spectroscopy (STEM-EDX). Au-Ni-Ga, which showed a nearly 4-fold improvement in TOF at 263 °C and 10 bar compared to Ni-Ga, consisted of Ni₃Ga particles decorated with Au, as evidenced by post catalysis characterization.

评估了Ni-Ga和M-Ni-Ga（M = Au，Co，Cu）催化剂在10 bar和200-270°C下由CO ₂合成甲醇的能力。CO _2的周转频率（TOF）的以下趋势观察到氢化：AuNiGa> CuNiGa> NiGa> CoNiGa，其中TOF随着催化剂对CO的亲和力降低而增加。发现第三种金属的存在会影响Ni-Ga金属间相的形成以及可用位点的数量用于CO化学吸附。使用热重分析（TGA），X射线衍射（XRD），X射线荧光（XRF），扫描透射电子显微镜和能量色散X射线光谱（STEM-EDX）评估相形成，催化剂组成和稳定性。与Ni-Ga相比，Au-Ni-Ga在263°C和10 bar下的TOF值提高了近4倍，其由装饰有Au的Ni ₃ Ga颗粒组成，这由后催化表征证明。