Photocatalytic Water-Splitting and Aqueous Phase Biomass Reforming for H2 Production

V. Buddineni, A. Shende, M. Hussein, A. Kawde, J.A. Puszynski, R.V. Shende
South Dakota School of Mines & Technology, US

Keywords: photocatalytic water-splitting, H2 generation, sugars, Pt/TiO2 nanoparticles, Pt/TiO2 nanotubes

Summary:

Photocatalysis using TiO2 has shown some promise towards H2 generation from water-splitting and biomass reforming reactions. In the present investigation, we report quantitative analysis of H2 produced by photorefoming of sugars (glucose, mannose, fructose, xylose, arabinose, galactose) and Kraft lignin (KL) using Pt/TiO2 nanoparticles and nanotube arrays in the presence and absence of potassium iodide (KI). TiO2 nanoparticles were sputter coated with Pt and used for photocatalytic biomass reforming. TiO2 nanotubes arrays were prepared using electrochemical anodization method and coated with Pt by wet-impregnation using hexachloroplatinic acid followed by calcinations at 400oC. About 6.0 ml suspension of Pt/TiO2 nanoparticles in water containing KI and a biomass was placed in a quartz reactor. The headspace gas was displaced with argon. The suspension was irradiated with 100 mW/cm2 light intensity from a solar simulator fitted with AM1.5G. The head space gas was sampled and analyzed for H2 and CO2 using gas chromatography. The TiO2 nanotube arrays were used to investigate H2 generation from water-splitting and aqueous phase biomass reforming reactions. The results obtained on the analysis of photocatalytic materials, and effectiveness of Pt/TiO2 nanoparticles and nanotube arrays on H2 generation from water-splitting and biomass reforming will be presented.