Advances in modified Fischer-Tropsch synthesis catalysts for CO/CO2 hydrogenation to higher alcohols
Carbon monoxide/carbon dioxide(CO/CO2)hydrogenation to higher alcohols(C2+OH),as the important part in C1 chemistry,is one of the most essential approaches to convert the non-petroleum carbon resources such as coal,natural gas,biomass and CO2 into liquid fuels and value-added chemicals.The short route,high atom economy and operational feasibility endow this process great potential to convert CO/CO2 to C2+OH.The modified Fischer-Tropsch synthesis(FTS)catalysts are one of the most prospective candidates for CO/CO2 hydrogenation to C2+OH,but the application of these catalysts is still limited by the low space time yield,the wide product distribution and poor catalytic stability,as well as the complicated reaction pathways.Thus,the development of efficient and stable catalysts is crucial but still challenging.Herein,the optimal reaction conditions for CO/CO2 hydrogenation to C2+OH were obtained on the basis of thermodynamics,and the reaction pathways of CO/CO2 hydrogenation on the modified FTS catalysts were clarified.Subsequently,the progress of iron or cobalt-based catalysts in CO/CO2 hydrogenation to C2+OH were reviewed,including the impact of precursors,promoters,the metal-support interaction on the catalytic performance,and the construction strategies of highly selective and stable catalysts were emphasized.In the future,it is crucial to clarify the catalytic mechanism through advanced characterizations and theoretical calculations,as well as to improve the space time yield of C2+OH and to enhance the stability via regulating the surface structure precisely.
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