In this study, WO3 (trioxide tungsten) was investigated as a catalyst for water reduction by NaBH4 in basic conditions, which are not typical for NaBH4 reduction processes. The results indicate that the structure of the WO3 phase strongly affects the catalytic process. The uncalcinated WO3, ncWO3, which contains primarily tungstite with traces of hydro-tungstite is the only WO3 form that acts as an effective catalyst. A cubic WO3 is formed or exposed during the reduction process. Hydrogen production increases during reaction cycles; an interesting and important result. Plausible mechanisms of the catalytic process observed are outlined. The results have far-reaching effects that should be further investigated in other systems, such as the phase structures acting as a catalyst for treating toxic organic compounds.
- Hydrated tungstite
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Fuel Technology
- Condensed Matter Physics
- Energy Engineering and Power Technology