The Influence of Alkali Treatment for Synthesizing Hierarchical Zeolite on Behavior of Cobalt Fischer–Tropsch Synthesis Catalysts

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• 作者：Yuelun Wang ; Xuewen Cao ; Yuan Jiang ; Hong Zhang ; Jing Liang…
• 关键词：Hierarchical zeolites ; Si/Al ratio ; Cobalt catalyst ; Ciso/Cn ratio ; Fischer–Tropsch synthesis
• 刊名：Catalysis Surveys from Asia
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：21
• 期：1
• 页码：28-36
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Catalysis; Physical Chemistry; Industrial Chemistry/Chemical Engineering; Characterization and Evaluation of Materials;
• 出版者：Springer US
• ISSN：1574-9266
• 卷排序：21

文摘

Hierarchical zeolites were synthesized by alkali treatment and their applications in Fischer–Tropsch (FT) synthesis were studied. It was found that alkali treatment not only created hierarchical structure but also could tune cobalt-support interaction. The dissolution of Si by alkali treatment became easier with the increase of Si/Al ratio, and thus the amount of mesopority increased. An optimal Si/Al molar ratio was identified over the zeolite with Si/Al ratio of 80, which was found to be superior to other catalysts in terms of better diesel selectivity and lower CH₄ selectivity due to its relatively narrow bimodal pore size distribution and moderate cobalt-support interaction. Meanwhile alkali treatment could enhance cobalt-support interaction via the formation of ɑ-SiO_2, Co/MZ-120 catalyst showed the lowest FT activity and higher CH₄ selectivity due to the increase of such new phase.