H2 reduction of hydrogen molybdenum bronze to porous molybdenum oxide and its catalytic properties for the conversions of pentane and propan-2-ol

Insights into the catalytic activity and surface modification of MoO3 during the hydrodeoxygenation of lignin-derived model compounds into aromatic hydrocarbons under low hydrogen pressures

“…Other reports suggest that a molybdenum suboxide (MoO 3Àx ) is responsible for the active site, and the reaction proceeds via a conventional bifunctional pathway. [55][56][57][58][59] Goguet and co-workers observed the formation of an oxycarbidic phase on the MoO 3 catalyst, but indicated that lattice carbon did not inuence isomerisation activity. 60 Nonetheless, both phases (i.e., MoO x C y H z or MoO 3Àx ) contain lower valence Mo 5+ and Mo 4+ states.…”

Density-functional studies of hydrogen peroxide adsorption and dissociation on MoO3(100) and H0.33MoO3(100) surfaces

“…Since the average oxidation number of Mo in H x MoO 3 is less than 6, molybdenum bronzes are strong reducing agents and have received attention as potential hydrogenation, dehydration and reduction catalysts. [21][22][23] Depending on the amount of hydrogen, four phases of H x MoO 3 have been identied. 24 According to early NMR studies, the H atoms in molybdenum bronzes preferentially occupy the intralayer positions on a quasi-one dimensional zigzag line connecting the vertex-sharing oxygen atoms of the MoO 6 octahedra.…”

A Comparative Study of Hydrogen Spillover on Pd and Pt Decorated MoO3(010) Surfaces from First Principles

“…A vast number of experiments have been performed to study their formation, catalytic activity, and other chemical properties. [1][2][3][4][5][6][7][8][9][10][11] Hydrogen bronze materials can be prepared by chemical or electrochemical methods. 8 For example, an atomic force microscopy study by Smith and co-workers demonstrated that MoO 3 undergoes topotactic reduction in H 2 -N 2 mixtures at 700 K and subsequently forms hydrogen molybdenum bronzes, H x MoO 3 (0 < x < 2).…”

“…It is known that hydrogen bronze materials (e.g., H x MoO 3 ) have great application potentials as hydrogenation/dehydration catalysts, fuel cell electrodes, and electrochromic devices. A vast number of experiments have been performed to study their formation, catalytic activity, and other chemical properties. − Hydrogen bronze materials can be prepared by chemical or electrochemical methods . For example, an atomic force microscopy study by Smith and co-workers demonstrated that MoO 3 undergoes topotactic reduction in H 2 −N 2 mixtures at 700 K and subsequently forms hydrogen molybdenum bronzes, H x MoO 3 (0 < x < 2). , Alternatively, these materials can also be prepared efficiently via the hydrogen spillover technique, in the presence of palladium or platinum catalysts. , In the spillover process, H 2 molecules are first dissociatively chemisorbed on the dispersed catalyst particles; then, the dissociated H atoms migrate onto the substrate and further diffuse into the oxide lattice.…”