Catalytic activity of Pt/SiO sub(2) nanocatalysts synthesized via ultrasonic spray pyrolysis process under CO oxidation

• Published in: Applied catalysis. B, Environmental Environmental, 2014-08, Vol.154-155, p.171-176
• Main Authors: Jung, Chan-Ho, Yun, Jaecheol, Qadir, Kamran, Naik, Brundabana, Yun, Jung-Yeul, Park, Jeong Young
• Format: Article
• Language: English
• Subjects: Calcination; Catalysis; Catalysts; Catalytic activity; Nanostructure; Oxidation; Platinum; Silicon dioxide
• ISSN: 0926-3373
• DOI: 10.1016/j.apcarb.2014.02.014

We report the catalytic activity of Pt/SiO sub(2) nanocatalysts synthesized via the ultrasonic spray pyrolysis (USP) process under CO oxidation. We found that the average particle size of the dispersed platinum nanoparticles can be controlled by changing the concentration of the Pt precursor and the calcination conditions. The amount of loaded platinum on the SiO sub(2) powder increased as the precursor concentration increased, while the specific surface area of the Pt/SiO sub(2) samples decreased. As the calcination temperature and time increased, the size of the platinum particles on the SiO sub(2) increased. As for catalytic reactivity, high loading of Pt/SiO sub(2) showed a higher conversion of CO. The turnover rate of the Pt/SiO sub(2) catalysts increased after calcination at 600 [degrees]C. then decreased after calcination at 750 [degrees]C, mainly due to agglomeration at the high temperature and partly because of severe oxidation. The catalytic activity of the Pt/SiCh nanocatalysts synthesized using USP exhibited higher catalytic activity compared with Pt/SiO sub(2) synthesized via wet chemical synthesis or wetness impregnation. It is attributed to better dispersion of the nanoparticles on the SiO sub(2) as well as the removal of hydrocarbon impurities during calcination. This work demonstrated the successful use of the spray pyrolysis process for synthesis of oxide-supported metal catalysts with high thermal stability and activity.