Abstract The composite catalysts AC-Ni/MgO-Al2O3 were prepared by the co-precipitation method with activated carbon (AC) and [Ni,Mg,Al]-hydrotalcite as the precursors, and characterized by XRD, TG-DTG, N2 adsorption, H2-TPR and SEM, respectively. The resultant catalysts were examined for CO2 reforming of methane. The results showed that the introduction of AC into Ni/MgO-Al2O3 catalyst improved the textural properties, especially the surface area and pore volume of mesopores, and decreased the size of metal Ni. Compared with Ni/MgO-Al2O3, the composite AC-Ni/MgO-Al2O3 exhibited higher catalytic activity, stability and H2/CO ratio. But the AC content obviously influenced the catalytic performances. High AC loading resulted in the decline of catalytic activity owing to lower surface area and fewer active Ni content in the catalyst. 10AC-Ni/MgO-Al2O3 with 10% AC displayed the best catalytic activity and stability compared with Ni/MgO-Al2O3. About 86.2% conversion of CH4, 91.3% conversion of CO2 and above 0.95 ratio of H2/CO were achieved over 10AC-Ni/MgO-Al2O3 sample for the reaction time of 5430 min. This work provides a route to improve catalytic performances of Ni-based catalysts in CO2 reforming of methane.

中文翻译：

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活性炭-Ni/MgO-Al2O3复合催化剂上甲烷CO2重整用于合成气生产

摘要 以活性炭（AC）和[Ni,Mg,Al]-水滑石为前驱体，采用共沉淀法制备了复合催化剂AC-Ni/MgO-Al2O3，并通过XRD、TG-DTG、N2吸附等表征手段对其进行了表征。 ，H2-TPR 和 SEM，分别。检查所得催化剂用于甲烷的CO 2 重整。结果表明，在 Ni/MgO-Al2O3 催化剂中引入 AC 改善了结构性能，特别是介孔的表面积和孔容，并减小了金属 Ni 的尺寸。与Ni/MgO-Al2O3相比，复合AC-Ni/MgO-Al2O3表现出更高的催化活性、稳定性和H2/CO比。但AC含量明显影响催化性能。由于催化剂中较低的表面积和较少的活性镍含量，高 AC 负载导致催化活性下降。与 Ni/MgO-Al2O3 相比，含 10% AC 的 10AC-Ni/MgO-Al2O3 表现出最好的催化活性和稳定性。在 5430 分钟的反应时间内，在 10AC-Ni/MgO-Al2O3 样品上实现了约 86.2% 的 CH4 转化率、91.3% 的 CO2 转化率和高于 0.95 的 H2/CO 比。该工作为提高镍基催化剂在甲烷 CO2 重整中的催化性能提供了一条途径。