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Impact of molar ratio of NH3 and H2O on CO2 reduction performance over Cu/TiO2 photocatalyst


Physics & Astronomy International Journal
Akira Nishimura,1 Yoshito  Sakakibara,1Tadaaki Inoe,1 Masafumi Hirota,1 Akira Koshio,2 Kokai Fumio,2 Eric Hu3

Abstract

Cu-doped TiO2 (Cu/TiO2) film photocatalyst was prepared by sol-gel dip-coating, and pulse arc plasma process. The netlike glass fiber was used as a base material for the photocatalyst since  it  had  a  porous  structure.  The  CO2  reduction  performance  with  NH3  and  H2O  into  CO  and  CH4  over  the  Cu/TiO2  photocatalyst  was  investigated  experimentally  under  the  illumination condition with UV as well as without UV. In addition, the characterization of prepared Cu/TiO2 film coated on netlike Lglass fiber was analyzed by SEM and EPMA. As a result, the CO2 reduction performance peaks under the condition of CO2/NH3/H2O=1:1:1 in both cases with UV light and without UV light illumination. The highest molar quantity of  CO  and  CH4  per  weight  of  photocatalyst  in  the  reactor  is  10.2μmol/g  and  1.76  μmol/g,  respectively.  Comparing  the  CO2  reduction  characteristics  for  CO2/NH3/H2O  with  that for CO2/H2O, it is concluded that the proper combination of NH3 and H2O would be effective  for  promoting  the  CO2  reduction  performance  over  Cu/TiO2,  for  the  improving  of the reduction performance of Cu/TiO2 being necessary to promote the conversion from NH3 into H2.

Keywords

photocatalyst, Cu/TiO2, CO2 reduction, optimum combination of NH3 and H2O

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