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On the link between CO surface coverage and selectivity to CH4 during CO2 hydrogenation over supported cobalt catalysts
Journal of Catalysis ( IF 6.5 ) Pub Date : 2022-05-14 , DOI: 10.1016/j.jcat.2022.05.001
Pauline Bredy , David Farrusseng , Yves Schuurman , Frederic C. Meunier

An operando IR study was carried out to investigate the loss of selectivity to higher hydrocarbons observed over cobalt-based Fischer-Tropsch catalysts when CO is replaced with CO2. Our data unambiguously show that the structure and oxidation state of the surface of metallic cobalt remains the same whether CO2 or CO are cofed with H2. The selectivity to CH4 appears to increase monotonously with decreasing surface coverage of adsorbed CO. The switch from Fischer-Tropsch synthesis to methanation using CO2-rich feeds over metallic cobalt can therefore be assigned to surface coverage effects only, assuming that most, if not all, hydrocarbons products are formed on metallic cobalt.



中文翻译:

负载型钴催化剂上 CO2 加氢过程中 CO 表面覆盖率与 CH4 选择性之间的联系

进行了操作 IR 研究,以研究当 CO 被 CO 2取代时,在钴基费托催化剂上观察到的对高级烃的选择性损失。我们的数据清楚地表明,无论CO 2或CO 是否与H 2共存,金属钴表面的结构和氧化态保持不变。对 CH 4的选择性似乎随着吸附 CO 的表面覆盖率的降低而单调增加。因此,从费托合成到使用富含 CO 2的进料而不是金属钴的甲烷化的转变只能归因于表面覆盖效应,假设大多数情况下,如果并非全部,碳氢化合物产品都是在金属钴上形成的。

更新日期:2022-05-14
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