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Effect of copper on calcium-modified alumina-supported cobalt catalysts

机译：铜对钙改性氧化铝负载钴催化剂的影响

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The present study reports the possibility of using copper as a low-cost reduction promoter in cobalt-based Fischer-Tropsch (FT) catalysts. Adsorption behaviour of CO and H-2 on alumina-supported Co and Co-Cu catalysts has been examined. Amount of CO and H-2 desorption and temperature of desorption are used to gain insights about the performance of the catalysts. Presence of Cu alters CO and H-2 adsorption on Co-alumina catalyst. Modification of alumina with Ca enhances Co dispersion and the amount of CO adsorbed. However, increase in the amount of CO adsorbed does not translate into increase in CO conversion. The Co-Cu-based catalysts display higher amount of H-2 adsorbed and higher CO desorption temperature. The latter is at the expense of the amount of CO adsorbed for low CO conversion resulting in lower activity for FT synthesis. The catalysts display high selectivity towards oxygenates. The high CO adsorption strength on Co-Cu-based catalysts is rationalized in terms of synergistic interaction of CO with cobalt particles through carbon atom and copper particles through oxygen atom
机译：本研究报告了在钴基费-托（FT）催化剂中使用铜作为低成本还原促进剂的可能性。已经研究了CO和H-2在氧化铝负载的Co和Co-Cu催化剂上的吸附行为。使用CO和H-2解吸量以及解吸温度来获得有关催化剂性能的见解。 Cu的存在改变了CO和H-2在共氧化铝催化剂上的吸附。用Ca对氧化铝进行改性可提高Co的分散度和吸附的CO量。然而，吸附的CO量的增加不会转化为CO转化率的增加。 Co-Cu基催化剂显示出更高的H-2吸附量和更高的CO解吸温度。后者是以低CO转化率吸附的CO量为代价的，从而导致FT合成的活性降低。催化剂显示出对含氧化合物的高选择性。在CO-Cu基催化剂上的高CO吸附强度是通过CO与通过碳原子的钴颗粒和通过氧原子的铜颗粒的协同相互作用而合理化的

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