Study of the effect of Mn on PtMn/C catalyst in aqueous phase reforming of ethylene glycol

This study aims to investigate the surface structure of bimetallic catalysts supported on carbon nanofibers (CNF) during aqueous phase reforming (APR) of ethylene glycol (EG) and their structural evolution induced with time on stream. The hydrothermal conditions during APR lead to changes in metal oxidation state, re-dispersion and dealloying of the catalyst nanoparticles. Thus, operando XAS and XRD studies will be conducted to determine the local environment, dispersion and metal phase of Pt and Mn in samples prepared by different synthesis methods. The experiments are expected to give insight into the catalyst changes during the reaction, which may lead to deactivation. It will provide crucial information used in the rational design of APR catalysts to improve the catalyst activity, selectivity, and stability.

本研究旨在探究乙二醇（ethylene glycol, EG）水相重整（aqueous phase reforming, APR）过程中，负载于碳纳米纤维（carbon nanofibers, CNF）上的双金属催化剂的表面结构及其随反应时间的结构演化。APR过程中的水热条件会导致催化剂纳米颗粒的金属氧化态变化、再分散及脱合金现象。因此，将开展原位X射线吸收光谱（operando XAS）和X射线衍射（XRD）研究，以确定不同合成方法制备的样品中Pt和Mn的局部环境、分散性及金属物相。预期这些实验将揭示反应过程中催化剂的变化，而此类变化可能导致其失活。该研究将为APR催化剂的理性设计提供关键信息，以提升催化剂的活性、选择性和稳定性。