Insight into the influence of rare-earth promoter (CeO2, La2O3, Y2O3, and Sm2O3) addition toward methane dry reforming over Co/mesoporous alumina catalysts
Insight into the influence of rare-earth promoter (CeO2, La2O3, Y2O3, and Sm2O3) addition toward methane dry reforming over Co/mesoporous alumina catalysts
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DOI：
10.1016/j.ces.2020.115967
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发表时间：
2020-12-31
影响因子：
4.7
通讯作者：
Vo, Dai-Viet N.
中科院分区：
文献类型：
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作者：
Bahari, Mahadi B.;Setiabudi, Herma Dina;Vo, Dai-Viet N.
采用甲烷干重整反应对Ce、La、Sm和Y促进的Co/介孔氧化铝（MA）催化剂进行了评价。加入助剂后，Co粒子在MA上的分散性得到明显改善，晶粒尺寸减小，Co团聚减少。与Ce和La助剂不同，Y和Sm助剂通过增强Co-MA相互作用降低了催化剂的还原性。反应物转化率的提高顺序为YCo/MA > LaCo/MA > CeCo/MA > SmCo/MA > Co/MA，积碳存款量的增加顺序为Co/MA > SmCo/MA > LaCo/MA > CeCo/MA > YCo/ MA。YCo/MA催化剂的活性最高（CH 4转化率为85.8%，CO2转化率为92.2%），积炭量最低（7.02%），这是由于Co分散度高、Co粒径小、Co-MA相互作用强和储氧能力强。H-2/CO比在0.78 - 0.86范围内，略低于1的结果，反向水煤气变换。(C)2020爱思唯尔有限公司保留所有权利。
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 con-versions 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. H-2/CO ratios were obtained within 0.78 0.86, slightly lower than 1 in consequence of the reverse water-gas shift. (C) 2020 Elsevier Ltd. All rights reserved.