In Situ MOF-Templating of Rh Nanocatalysts under Reducing Conditions

Abstract

Manganese-based metal–organic frameworks (MOFs) metalated with Rh were used as pre-catalysts for CO2 hydrogenation. Activated insitu (80% H2, 20% CO2, 350°C), the resulting templated catalysts displayed CO2 conversion of up to 20%, with CH4 as the main product. Used catalysts were compared with samples templated in 5% H2/Ar at 350°C using powder X-ray diffraction, electron microscopy, energy dispersive spectroscopy, and X-ray photoelectron spectroscopy. It was found that under reducing atmosphere Rh0 nanoparticles formed and organic MOF components decomposed, which allowed growth of MnO or MnCO3 and the formation of a mesh of catalytic Rh0 nanoparticles.