Abstract Co/mesoporous alumina (MA) catalysts promoted with Ce, La, Sm, and Y were evaluated via methane dry reforming. Co particle dispersion on MA was evidently improved after promoter incorporation, resulting in smaller crystallite size and lesser Co agglomeration. Unlike Ce and La promoters, the employment of Y and Sm promoters reduced catalyst reducibility by strengthening Co-MA interaction. The reactant conversions improved in the order of YCo/MA > LaCo/MA > CeCo/MA > SmCo/MA > Co/MA, while the amount of carbon deposit was recorded with the sequence of Co/MA > SmCo/MA > LaCo/MA > CeCo/MA > YCo/MA. Additionally, YCo/MA attained the highest activity (CH4 conversion = 85.8%, CO2 conversion = 92.2%) and possessed the lowest carbon deposition (7.02%) due to great Co dispersion, small Co particle size with strong Co-MA interaction and higher oxygen storage capacity. H2/CO ratios were obtained within 0.78–0.86, slightly lower than 1 in consequence of the reverse water–gas shift.

中文翻译：

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深入了解稀土促进剂（CeO2、La2O3、Y2O3 和 Sm2O3）添加对 Co/介孔氧化铝催化剂上甲烷干重整的影响

摘要 通过甲烷干重整评估了以 Ce、La、Sm 和 Y 促进的 Co/介孔氧化铝 (MA) 催化剂。加入促进剂后，钴颗粒在 MA 上的分散明显改善，导致更小的晶粒尺寸和更少的钴团聚。与 Ce 和 La 促进剂不同，Y 和 Sm 促进剂的使用通过增强 Co-MA 相互作用降低了催化剂的还原性。反应物转化率按YCo/MA>LaCo/MA>CeCo/MA>SmCo/MA>Co/MA的顺序提高，而积碳量的顺序为Co/MA>SmCo/MA>LaCo/ MA > CeCo/MA > YCo/MA。此外，YCo/MA 获得了最高的活性（CH4 转化率 = 85.8%，CO2 转化率 = 92.2%），并且由于 Co 分散性好，碳沉积最低（7.02%），Co 粒径小，Co-MA 相互作用强，储氧能力强。H2/CO 比值在 0.78-0.86 范围内，由于反向水气转换而略低于 1。