[2011年11月01日]

Photocatalytic H2 production on TiO2 with tuned surface-phase structures: enhancing activity and reducing CO formation

 

 

 

    

    New progresses on photocatalytic activity promoted by phase junction of TiO2 were obtained in our group recently.


    The TiO2 catalysts with different phase structure were prepared by carefully calcination of P25, at different temperatures. The activity was enhanced to 3~5 times of that of P25, which is an excellent photocatalyst. Further, we improved our preparation method and use Na2SO4 as an additive to control the phase structure of TiO2 at high temperature. This method can maintain the high crystallinity of TiO2 during the high temperature treatment and at the same time insure the mixed phase structure of TiO2. The photocatalytic H2 production activity via methanol reforming was enhanced to 6 times of that of P25.

    Furthermore, we found that the CO selectivity (expressed as CO / H2) in the reforming reactions of P25 was up to several thousands of ppm, while it can decrease to 10 ppm in our catalysts. It is proposed that the decrease in the acidity of the samples might be responsible for the low CO selectivity

 

Article
Enhancing hydrogen production activity and suppressing CO formation from photocatalytic biomass reforming on Pt/TiO2 by optimizing anatase–rutile phase structure
Qian Xu, Yi Ma, Jing Zhang, Xiuli Wang, Zhaochi Feng, Can Li*
 J. Catal, 2011, 278, 329-335
http://dx.doi.org/10.1016/j.jcat.2011.01.001

Photocatalytic H2 production on Pt/TiO2–SO42- with tuned surface-phase structures: enhancing activity and reducing CO formation
Yi Ma, Qian Xu, Xu Zong, Donge Wang, Guopeng Wu, Xiang Wang and Can Li*
Energy Environ. Sci., 2011, DOI: 10.1039/c1ee02053f
http://pubs.rsc.org/en/content/articlelanding/2011/ee/c1ee02053f

 

 

 

 

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