Effects of alkali promoters on tri-metallic Co-Ni-Cu-based perovskite catalyst for higher alcohol synthesis from syngas
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© 2019 Elsevier B.V. Direct conversion of natural gas-derived syngas into higher alcohols via the Fischer-Tropsch process offers a more sustainable pathway to address fuels and chemicals demands for various industries in the near future. Large scale application of this process nonetheless relies on the availability of a highly active and selective catalyst. In this work, tri-metallic Co-Ni-Cu catalyst derived from La0.9Sr0.1Co0.8Ni0.1Cu0.1O3 perovskite precursor with two different alkali promoters were prepared and tested for higher alcohol synthesis from syngas. Active components and catalyst performances were found to vary with same weight loading of Na and K. K-promoted catalyst demonstrated the best higher alcohol formation with the higher alcohol distribution of 82.2% and alcohol chain growth probability factor of 0.53 at 325 °C, followed by the Na-promoted and non-promoted counterparts. The rationale behind the alkali addition—performance relationship is two-fold. On one hand, the addition of alkali promotes the formation of stable Co2C; resulting in high Co2C/Co ratio that enhances the higher alcohol distribution but decreases the CO conversion. On the other hand, the increased catalyst basicity obtained from alkali promotion facilitates the carbon chain propagation of alcohols, especially for the conversion of methanol to ethanol. In addition, the alkali promoters, especially K, prevent the deactivation of catalyst Co-Ni-Cu by eliminating the carbon deposition during the reaction; resulting in a stable catalyst even at 340 °C.
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Ao, Min (2017)This study investigated the effects of partial substitution at the A- and/or B-site of LaCoO3 perovskite catalysts (ABO3) on higher alcohol synthesis (HAS) from syngas. The catalyst properties and catalytic performances ...
Selectivity enhancement for higher alcohol product in Fischer-Tropsch synthesis over nickel-substituted La<inf>0.9</inf>Sr<inf>0.1</inf>CoO<inf>3</inf> perovskite catalystsAo, M.; Pham, Gia; Sage, V.; Pareek, Vishnu (2017)© 2017 Elsevier Ltd The performance of La 0.9 Sr 0.1 Co 1-x Ni x O 3 perovskite catalysts with different Ni substitution levels was evaluated in the Fischer-Tropsch (F-T) synthesis for higher alcohol production. It was ...
Ao, Min; Pham, Gia ; Sage, V.; Pareek, Vishnu ; Liu, Shaomin (2019)© 2019 Elsevier B.V. Trimetallic Co-Ni-Cu catalyst from perovskite precursor was prepared by co-precipitation method and then examined for its ability to form higher alcohols from syngas. A superior C2+OH yield of 142.1 ...