Rhodium-catalysed reduction of vanadium pentoxide and tungsten trioxide by hydrogen

Abstract

Hydrogen reduction of V₂O₅ and WO₃ catalysed by rhodium, both in the pure form and supported on kieselguhr, has been studied. The products obtained at 300°C have been identified as VO₂ and H_xWO₃. In situ electrical resistivity measurements on V₂O₅ pellets, both pure and admixed with the catalyst, show an anomalous resistance increase with temperature, perhaps arising from chemisorption and spillover of hydrogen from rhodium.