La effect on the long-term durability of Ni-Mg-Al₂O₃ catalysts for syngas methanation

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• 作者：Ki Hun Song^a ; Xian Yan^a ; Dong Jun Koh^c ; Taewook Kim^a ; Jong-Shik Chung^a ; ^b ; ^{jsc@postech.ac.kr}
• 关键词：CO methanation ; Syngas ; Ni-Mg-Al2O3 catalyst ; La effect ; Thermal stability
• 刊名：Applied Catalysis A: General
• 出版年：2017
• 出版时间：25 January 2017
• 年：2017
• 卷：530
• 期：Complete
• 页码：184-192
• 全文大小：1458 K
• 卷排序：530

文摘

A study of La effect on the long-term duration of Ni-Mg/alumina catalyst, especially under high-severity conditions. The low content of La acts as both physical promoter and chemical promoters for fresh Ni-Mg-Al2O3, but further addition of La over 3 wt.% begins to cover Ni active sites. Improved thermal resistance and sufficient methanation activity was achieved for 5 wt.% loading of La on Ni-Mg-Al2O3 catalyst. A mild increase in activity for higher La loading is attributed to uncovering effect of La on the Ni surface through the growth of dispersed La into aggregates during ageing.