TY - JOUR
T1 - Characterization of Pt-based oxidation catalyst – Deactivated simultaneously by sulfur and phosphorus
AU - Honkanen, Mari
AU - Huuhtanen, Mika
AU - Kärkkäinen, Marja
AU - Kanerva, Tomi
AU - Lahtonen, Kimmo
AU - Väliheikki, Ari
AU - Kallinen, Kauko
AU - Keiski, Riitta L.
AU - Vippola, Minnamari
N1 - Funding Information:
Electron microscopy work made use of Tampere Microscopy Center facilities at Tampere University.
Publisher Copyright:
© 2021 The Author(s)
PY - 2021/5
Y1 - 2021/5
N2 - Simultaneous poisoning of sulfur + phosphorus on a platinum-based diesel oxidation catalyst was studied to gain a deeper understanding on the catalyst deactivation. Compared to a single poisoning (sulfur or phosphorus), the simultaneous poisoning had a severe effect on the catalyst activation: light-off temperature for 90% conversion of propene was not reached, this of carbon monoxide was much higher than expected, and the maximum conversion of nitrogen monoxide collapsed. With very comprehensive structural characterization by various methods (e.g. STEM-EDS, XPS, DRIFTS) used, we achieved to conclude an explanation for this. In the case of the S + P-poisoning of the catalyst, formed aluminum phosphate was found to block adsorption sites for sulfur species on alumina and sulfur adsorbs mainly on cerium oxides. In addition, sulfur species remain with and in the vicinity of the platinum particles blocking active sites.
AB - Simultaneous poisoning of sulfur + phosphorus on a platinum-based diesel oxidation catalyst was studied to gain a deeper understanding on the catalyst deactivation. Compared to a single poisoning (sulfur or phosphorus), the simultaneous poisoning had a severe effect on the catalyst activation: light-off temperature for 90% conversion of propene was not reached, this of carbon monoxide was much higher than expected, and the maximum conversion of nitrogen monoxide collapsed. With very comprehensive structural characterization by various methods (e.g. STEM-EDS, XPS, DRIFTS) used, we achieved to conclude an explanation for this. In the case of the S + P-poisoning of the catalyst, formed aluminum phosphate was found to block adsorption sites for sulfur species on alumina and sulfur adsorbs mainly on cerium oxides. In addition, sulfur species remain with and in the vicinity of the platinum particles blocking active sites.
KW - Analytical transmission electron microscopy
KW - Deactivation
KW - Environmental catalysis
KW - Fourier transform infrared spectroscopy
KW - X-ray photoelectron spectroscopy
U2 - 10.1016/j.jcat.2021.03.026
DO - 10.1016/j.jcat.2021.03.026
M3 - Article
AN - SCOPUS:85104671746
SN - 0021-9517
VL - 397
SP - 183
EP - 191
JO - Journal of Catalysis
JF - Journal of Catalysis
ER -