Direct pathway towards long-chain alcohols and olefins by FTS - Atomistic origin of Mn promotion in Co-based FTS catalysts

Recently, it was discovered that the presence of manganese (Mn) in cobalt (Co)-based Fischer-Tropsch (FT) catalysts can shift the selectivity of products from traditional FT products to long chain alcohols in syngas mixtures (CO+H2). Using surface organometallic chemistry, which has proven effective for synthesizing model catalysts for various reactions, we created Mn-doped Co nanoparticles on TiO2 with tailored surfaces and interfaces to investigate the origin of this Mn effect. We wish to use ex situ and in situ X-ray absorption spectroscopy to understand the interplay between Co and Mn. By combining in situ XAS with other spectroscopic, microscopic, and physico-chemical techniques, and by linking to catalytic data, we hope to better comprehend the Mn effect. As Mn has gained attention as a promoter in various catalytic systems, this study is of interest to a broader audience in heterogeneous catalysis.

近期研究发现，钴（Co）基费托（Fischer-Tropsch, FT）催化剂中锰（Mn）的存在，可将产物选择性从传统费托产物转向合成气混合气（CO+H₂）中的长链醇类。本研究借助已被证实可有效合成各类反应模型催化剂的表面有机金属化学技术，在二氧化钛（TiO₂）上制备了具有定制化表面与界面结构的锰掺杂钴纳米颗粒，以探究该锰助剂效应的起源。我们计划采用非原位与原位X射线吸收光谱（X-ray absorption spectroscopy, XAS）技术，解析钴与锰之间的相互作用机制。通过将原位XAS与其他光谱学、显微学及物理化学表征手段相结合，并关联催化性能数据，我们期望更深入地阐明锰助剂的作用机理。鉴于锰作为助剂在各类催化体系中已受到广泛关注，本研究对多相催化领域的广大研究者均具有参考价值。