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Photocatalytic Conversion of Carbon Dioxide to Value-Added Products Using Pt Containing Catalysts

Moradi, Mohsen | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52569 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Khorasheh, Farhad; Larimi, Afsaneh Sadat
  7. Abstract:
  8. The conversion of CO2 gas into value-add chemicals known as solar fuel technology attracted much consideration from the beginning of the 21st century owing to the potential of this technology in solving the climate change and energy shortage issues. In the present study, a well-known photocatalyst, TiO2, was doped with Bismuth element and was subjected to Pt nanoparticles loading as a cocatalyst to boost the photocatalytic CO2 conversion. Pristine TiO2 and Bi-doped samples were prepared by sol gel method. Then, a facile photo-deposition method was employed to introduce Pt onto the surface of TiO2. Various characterization techniques including XRD, DRS, BET, PL, FTIR, FESEM and TEM, were used to investigate physicochemical properties of synthesized samples. By loading different Bi content (1, 3 and 5 wt %) and also different Pt amount (1, 1.5 and 2 wt %), it is revealed that Pt/TiO2 and Bi-modified TiO2 dramatically enhance the CO2 photo-conversion in comparison with bare TiO2, which is attributed to the enhancement in charge-separation efficiency and CO2 activation kinetics upon Pt deposition and Bithmuth incorporation. Also, the reaction results showed that the modification of TiO2 with 1.5 wt % of Pt and 3 wt % of Bi yielded an optimal performance toward CH4 generation with the maximum production of 20.59 μmol/gcat after 10h of light illumination, which was 6.3 times greater than neat TiO2. It is seemed that the intrinsic characteristic of Bi-contaning components in CO2 adsorption and suppressed electron-hole recombination introduced by Pt, were the main reasons for improved photocatalytic activity of prepared samples
  9. Keywords:
  10. Titanium Dioxide ; Platinum Nanoparticle ; Methane ; Carbon Dioxide Absorption ; Bismuth Doping ; Carbon Dioxide Photoconversion

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