Co-Based Catalysts Supported on Silica and Carbon Materials: Effect of Support Property on Cobalt Species and Fischer–Tropsch Synthesis Performance,Industrial & Engineering Chemistry Research

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Co-Based Catalysts Supported on Silica and Carbon Materials: Effect of Support Property on Cobalt Species and Fischer–Tropsch Synthesis Performance
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2019-02-14 , DOI: 10.1021/acs.iecr.8b05451
Xin Li ₁ , Mehar U Nisa ₁ , Yao Chen ₁ , Zhenhua Li ₁

Affiliation

The influence of different support surfaces and physical structures on cobalt species and catalytic Fischer–Tropsch synthesis (FTS) performance has been investigated by using silica or mesoporous carbon as support. All the three catalysts Co/SBA-15, Co/SiO₂, and Co/CMK-3 behaved differently in the FTS test and showed characteristic cobalt species. After calcination in argon, Co₃O₄ was prominent on both Co/SBA-15 and Co/SiO₂ because of the stronger metal–support interaction. However, the weaker metal–support interaction on Co/CMK-3 coupled with the autoreduction of cobalt oxide facilitated the formation of more CoO on the support surface. On account of the higher reducibility and specific surface area, Co/SBA-15 exhibited higher CO conversion in FTS than another two as-synthesized catalysts. SBA-15 and CMK-3 possess well-ordered channel structure which favors mass transport and diffusion while diffusion inhibits hydrocarbon chain growth. The highest C₅₊ and C_11–17 selectivities were observed over Co/SiO₂ without regular channels, enabling enough intermediate residence time for carbon chain growth.

中文翻译：

二氧化硅和碳材料上负载的钴基催化剂：负载性质对钴物种和费托合成性能的影响

通过使用二氧化硅或中孔碳作为载体，已经研究了不同载体表面和物理结构对钴物种和费托合成催化（FTS）性能的影响。在FTS测试中，三种催化剂Co / SBA-15，Co / SiO ₂和Co / CMK-3的行为均不同，并显示出特征性的钴物种。在氩气中煅烧后，Co ₃ O ₄在Co / SBA-15和Co / SiO ₂上均显着因为金属与载体之间的相互作用更强。然而，Co / CMK-3上较弱的金属-载体相互作用与钴的自动还原相结合，促进了在载体表面上形成更多的CoO。由于较高的可还原性和比表面积，Co / SBA-15在FTS中的CO转化率比另两种合成催化剂高。SBA-15和CMK-3具有井然有序的通道结构，有利于质量传输和扩散，而扩散则抑制烃链的生长。在没有规则通道的情况下，在Co / SiO _2上观察到了最高的C ₅₊和C _11-17选择性，从而为碳链的生长留出了足够的中间停留时间。

更新日期：2019-02-14

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