are prepared by a sol-gel method and an impregnation-reduction technique
respectively. The structures and textures of the as-synthesized catalysts are characterized by XRD
UV-VIS-DRS spectroscopy
and N
2
adsorption. The influences of the reactive atmospheres
the loaded amounts of Pt
the type of loaded metals
and the initial concentration of glucose on the glucose reforming into hydrogen are investigated. The photocatalytic hydrogen evolution activities of Pt/TiO
2
for different carbohydrates are also compared. The results show that loading of noble metals can remarkably enhance the activity of TiO
2
for the hydrogen evolution from an aqueous solution of glucose
alth
ough no noticeable changes in the crystal phase and BET surface area of TiO
2
are observed. Pt/TiO
2
shows the highest activity when mass fraction of Pt reaches 1%. In the case of 1% mass fraction of noble metal
the hydrogen evolution of glucose decreases in the order Pt/TiO
2
Pd/TiO
2
Au/TiO
2
Rh/TiO
2
Ag/TiO
2
Ru/TiO
2
. The O
2
ambience inhibits the hydrogen evolution
while N
2
is favorable for the formation of hydrogen. All the carbohydrates show good hydrogen production
but the evolution rate decreases as the polymerization degree increases. The effect of the initial concentration of glucose on the reaction rate follows the kinetic model of Langmuir-Hinshelwood.
P. A. M. Claassen,J. B. van Lier,A. M. Lopez Contreras,E. W. J. van Niel,L. Sijtsma,A. J. M. Stams,S. S. de Vries,R. A. Weusthuis.Utilisation of biomass for the supply of energy carriers[J].Applied Microbiology and Biotechnology,1999(6).
Xianzhi Fu,Walter A Zeltner,Qing Yang,Marc A Anderson.Catalytic Hydrolysis of Dichlorodifluoromethane (CFC-12) on Sol-Gel-Derived Titania Unmodified and Modified with H 2 SO 4[J].Journal of Catalysis,1997(2).