Photocatalytic H2production on Pt/TiO2–SO42−with tuned surface-phase structures: enhancing activity and reducing CO formation

• DOI: 10.1039/c1ee02053f
• Publication Date: 2011-09-23T12:30:05Z
• Authors: Yi Ma; Qian Xu; Xu Zong; Donge Wang; Guopeng Wu; Xiang Wang; Can Li
• Keywords: Rutile; Titanium Dioxide

Photocatalytic reforming of biomass is a promising way to produce hydrogen using renewable energy. methanol on Pt/TiO2–SO42− as model reaction was investigated. Sulfated TiO2 (TiO2–SO42−) with tunable surface phase prepared by calcining commercially available titanium dioxide (Degussa P25) deposited sodium sulfate Na2SO4 modifier. Compared P25, the as-prepared TiO2–SO42− Pt co-catalyst shows an increase up 6-fold in activity for H2 production via photocatalytic methanol, and CO (undesired product) concentration produced decreased about two orders magnitude. XRD patterns UV Raman spectra clearly indicate that depositing can significantly retard transformation from anatase rutile during calcination at elevated temperatures. It proposed both composition high crystallinity contribute evolution activity. IR pyridine adsorption NH3-TPD profile show acid sites photocatalyst are greatly reduced after decrease acidity samples might be responsible low selectivity.