Sammendrag
Platinum supported on ceria and zirconia was prepared through different preparation
methods: Coprecipitation (CP), spray drying (SD), and flame spray pyrolysis (FSP). The catalysts were
characterized by XRD, TPR, N2 adsorption, and H2 chemisorption, and the water–gas shift activity
in the range 190–310 ◦C and initial stability at 300–310 ◦C were tested. Although the spray-dried
Pt/CeO2/ZrO2 catalyst shows the highest initial activity, it deactivates rapidly at 300 ◦C and levels out
at similar activity as the coprecipitated Pt/CeO2 and Pt/CeO2/ZrO2 within a few hours. Flame spray
pyrolysis appears to be a promising preparation method concerning the stability of catalysts, although
the initial activity is rather poor. High activity is related to high Pt dispersion, low reduction
temperature, and small support particles. The support particle size is also much affected by the
preparation method.
methods: Coprecipitation (CP), spray drying (SD), and flame spray pyrolysis (FSP). The catalysts were
characterized by XRD, TPR, N2 adsorption, and H2 chemisorption, and the water–gas shift activity
in the range 190–310 ◦C and initial stability at 300–310 ◦C were tested. Although the spray-dried
Pt/CeO2/ZrO2 catalyst shows the highest initial activity, it deactivates rapidly at 300 ◦C and levels out
at similar activity as the coprecipitated Pt/CeO2 and Pt/CeO2/ZrO2 within a few hours. Flame spray
pyrolysis appears to be a promising preparation method concerning the stability of catalysts, although
the initial activity is rather poor. High activity is related to high Pt dispersion, low reduction
temperature, and small support particles. The support particle size is also much affected by the
preparation method.