An InOx Surface Enrichment on the Cu Nanoparticles for the Methanol Steam Reforming

This work reports the surface enrichment of InO_x on Cu nanoparticles suppresses both the dehydrogenation of *CH₃O and the dissociation of H₂O, ultimately leading to a reduction in methanol steam reforming catalytic activity.

Abstract

In the realm of heterogeneous catalysts promoted by indium, indium often covers other active metals, thereby compromising catalytic activity. However, the inhibition mechanism remains poorly understood. In this study, we investigate the interaction between copper (Cu) and indium oxide (InO_x), focusing on the role of the Cu−In interface during the methanol steam reforming (MSR) reaction. Utilizing a series of (quasi) in situ characterization techniques, we observe a decrease in intrinsic catalytic activity for MSR on the CuIn/Al₂O₃ catalyst, which can be attributed to the surface enrichment of InO_x on Cu nanoparticles. Moreover, our findings reveal that the enrichment suppresses both the dehydrogenation of *CH₃O and the dissociation of H₂O, ultimately leading to a reduction in catalytic activity. This discovery has the potential to guide the rational design of enhanced indium-based catalysts in the future.

Zum Volltext