The role of metal–support interaction for CO-free hydrogen from low temperature ethanol steam reforming on Rh–Fe catalysts

Abstract

Rh-Fe catalysts supported on Ca-AlO, MgO and ZrO were evaluated in ethanol steam reforming at 623 K and compared to Rh catalysts on the same supports without iron promotion. The metal-support interaction among the three entities, i.e. Rh ↔ FeO ← support (ZrO, MgO and Ca-AlO) was investigated using H-chemisorption, TEM, XPS and in situ techniques such as DRIFTS, temperature-resolved XRD and XAS. As compared to the unpromoted Rh catalysts on the same supports, the CO selectivity is depressed in the presence of iron on Rh/MgO and Rh/Ca-AlO, the latter being significantly superior. The role of metal-support interaction for CO-free hydrogen generation was unravelled using a combination of techniques. It was found that the reducibility of iron oxide determines the extent of the strong metal support interaction between Rh and FeO and the reducibility of iron oxide was affected by the support. On Rh-Fe/Ca-AlO, a good balance of the interaction between Rh, FeO and Ca-AlO prevents strong metal support interaction between Rh and FeO and thus promotes CO elimination via water-gas-shift reaction on Rh-FeO sites.

Sorption‐Enhanced Steam Reforming of Ethylene Glycol over Dual Functional Hydrotalcite Materials Promoted with Pt and Ru

“…Further, high CO uptake values for the promoted materials implies the availability of larger number of surface active sites for reaction. Such high metal dispersion and small crystallite sizes enhance the catalytic activity . These results prove good dispersion of the active metal on the HTlc support.…”

Environment of Metal–O–Fe Bonds Enabling High Activity in CO2 Reduction on Single Metal Atoms and on Supported Nanoparticles

“…Thus, we conclude that isolated Rh atoms are anchored to under-coordinated octahedral positions at the surface. A direct bond between Rh and Fe in the form of Rh–Fe is excluded, because the Rh–Fe distance in the alloy is 2.53–2.59 Å (i.e., less than the distance of 2.98 Å that we observed). − The detailed description of the analysis of the X-ray spectra is provided in supplementary notes in Tables S3–S6 and Figures S1–S8 in the Supporting Information.…”

Constructing MoPx@MnPy Heteronanoparticle-Supported Mesoporous N,P-Codoped Graphene for Boosting Oxygen Reduction and Oxygen Evolution Reaction

“…For example, Pu et al successfully grew a flexible MoP nanosheet array on a carbon cloth and a film of semimetallic MoP 2 nanoparticles on a metal Mo plate as active, stable, and binder-free electrodes for HER over a wide pH range. Other literature studies on the deposition of active catalysts on metal oxide substrates, such as TiO 2 , Fe x O y , MnO 2 , Co 3 O 4 , SnO 2 , CeO 2 , and Al 2 O 3 , ..., − have also been widely investigated for heterogeneous catalysis. Among these oxides, mesoporous Mn oxide substrates deposited with active catalysts were interestingly considered , because of the interesting properties of Mn oxides in oxidation reactions, likely related to the variable valency of Mn .…”