A series of Ni_xCo_(10-x)/SBA-15 catalysts with constant metal loading (10 wt%) and different Co/Ni mass ratios (0/10–10/0) were prepared by urea co-precipitation and applied to the dry reforming of methane (DRM). The physicochemical properties of the catalysts were characterized in detail by various techniques (N₂ physisorption, H₂ chemisorption, XRD, TPR, ICP-OES, TGA, HRTEM and XPS), revealing that Ni and Co particles were embedded into the channel of SBA-15 and Ni was alloyed with Co. In addition, the bimetallic catalysts with a Co/Ni ratio (R_Co/Ni) lower than 1 had relatively high metal dispersion (ca. 17–20%) and small metal particle sizes (ca. 4–5 nm). The DRM activity and stability of Ni_xCo_(10-x)/SBA-15 in terms of coke- and sintering- resistance were systematically examined and compared, which showed that the activity and stability of the catalysts depended strongly on the metal particle size, indicating the structure-sensitive character of the DRM reaction. Compared to monometallic Ni₁₀/SBA-15 and Co₁₀/SBA-15, bimetallic Ni_xCo_(10-x)/SBA-15 with R_Co/Ni < 1 possessed improved activity and stability, which was mainly attributed to the small metal particle size, the synergetic effect of Co and Ni as well as the confinement effect of SBA-15 mesoporous channels. In particular, Ni₉Co₁/SBA-15 exhibited the highest activity, stability and H₂/CO molar ratio (close to 1) during 50 h of operation at a gas hourly space velocity of 72000 mL/(g_cat h) under 973 and 1073 K. Moreover, no coke deposition occurred on the catalyst, with only slight metal particle size growth to around 5 nm, indicating excellent coke- and sintering-resistance.

通过尿素共沉淀制备了一系列具有恒定金属负载量（10 wt％）和不同Co / Ni质量比（0 / 10–10 / 0）的Ni _x Co _（10-x） / SBA-15催化剂，并进行了应用甲烷的干重整（DRM）。通过各种技术（N ₂物理吸附，H ₂化学吸附，XRD，TPR，ICP-OES，TGA，HRTEM和XPS）详细表征了催化剂的理化性质，表明Ni和Co颗粒嵌入SBA通道中-15且Ni与Co合金化。此外，Co / Ni比（R _{Co / Ni}）小于1的双金属催化剂具有较高的金属分散度（约17–20％）和较小的金属粒度（ca 4-5 nm）。Ni _x的DRM活性和稳定性对Co _（10-x） / SBA-15的耐焦烧性和耐烧结性进行了系统地检查和比较，结果表明，催化剂的活性和稳定性强烈依赖于金属的粒径，表明其结构敏感性。 DRM反应。与单金属Ni ₁₀ / SBA-15和Co ₁₀ / SBA-15相比，R _{Co / Ni}  <1的双金属Ni _x Co _（10-x） / SBA-15具有更高的活性和稳定性，这主要归因于其体积小。金属颗粒尺寸，Co和Ni的协同作用以及SBA-15中孔通道的限制作用。特别是Ni ₉ Co ₁/ SBA-15 在973和1073 K的气体小时空速为72000 mL /（g _cat h）的条件下运行50小时，在50小时的运行中具有最高的活性，稳定性和H ₂ / CO摩尔比（接近1）。在催化剂上没有发生焦炭沉积，只有很小的金属粒度增长到5 nm左右，这表明优异的耐焦炭性和耐烧结性。