Ni-Fe Bimetallic Nanocatalysts Produced by Topotactic Exsolution in Fe deposited PrBaMn1.7Ni0.3O5+delta for Dry Reforming of Methane

Abstract

In the beneficial dry reforming of methane (DRM) process utilizing two major greenhouse gases (CH4 and CO2), Ni-based supported catalysts have been widely used. However, the instability of catalysts from coke formation or sintering remains challenging. Here we present topotactic exsolution which can be a valid way to overcome both problems by producing more "embedded" particles of the selective alloy. Indeed, the introduction of Fe guest ions to PrBaMn1.7Ni0.3O5+delta (PBMNi) perovskite host results in a more number of Ni-Fe alloy nanoparticles through topotactic exsolution. Furthermore, the finely dispersed Ni-Fe alloy metal particles lead to their improved catalytic activity with stable performance compared to pristine PBMNi without alloy catalysts. These findings demonstrate that topotactic exsolution is an effective means of catalytic synthesis in gas phase reactions by producing bimetallic nanoparticles. (C) 2020 The Electrochemical Society ("ECS"). Published on behalf of ECS by IOP Publishing Limited.