TY - JOUR
T1 - On the mutual interactions between noble metal crystallites and zeolitic supports and their impacts on catalysis
AU - Villegas, J. I.
AU - Kubička, D.
AU - Karhu, H.
AU - Österholm, H.
AU - Kumar, N.
AU - Salmi, T.
AU - Murzin, D. Yu.
N1 - Funding Information:
This work is part of the activities at Åbo Akademi Process Chemistry Centre within the Finnish Centre of Excellence Program (2000–2001) by the Academy of Finland. Financial support from the Graduate School of Materials Research and Neste Oil for José Ignacio Villegas is gratefully acknowledged.
Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2007/3/1
Y1 - 2007/3/1
N2 - The mutual metal-support interactions were studied in mordenite zeolite modified with 0.5, 2 and 5 wt.% platinum by impregnation or ion-exchange method. Each modification method led to different catalysts from the point of view of acidity. These interactions were thoroughly investigated by XPS, CO and pyridine FTIR spectroscopy, NH3-TPD and a model reaction (isomerization of n-butane). By XPS measurements and CO adsorption, it was observed that the Pt binding energy and the CO adsorption band increased with the acidity of the support. Simultaneously, a rearrangement on the strength of acid sites was recorded by pyridine-FTIR when the zeolites were modified by a metal function. Ultimately, such changes in acidity were translated into different catalytic performances, mostly by suppressing or favoring cracking reactions. The interatomic model was examined and extrapolated to cover the effects that the metal particles have upon the support acidity.
AB - The mutual metal-support interactions were studied in mordenite zeolite modified with 0.5, 2 and 5 wt.% platinum by impregnation or ion-exchange method. Each modification method led to different catalysts from the point of view of acidity. These interactions were thoroughly investigated by XPS, CO and pyridine FTIR spectroscopy, NH3-TPD and a model reaction (isomerization of n-butane). By XPS measurements and CO adsorption, it was observed that the Pt binding energy and the CO adsorption band increased with the acidity of the support. Simultaneously, a rearrangement on the strength of acid sites was recorded by pyridine-FTIR when the zeolites were modified by a metal function. Ultimately, such changes in acidity were translated into different catalytic performances, mostly by suppressing or favoring cracking reactions. The interatomic model was examined and extrapolated to cover the effects that the metal particles have upon the support acidity.
KW - Interatomic potential model
KW - Mutual metal-support interactions
KW - Zeolites
UR - http://www.scopus.com/inward/record.url?scp=33847175230&partnerID=8YFLogxK
U2 - 10.1016/j.molcata.2006.09.017
DO - 10.1016/j.molcata.2006.09.017
M3 - Article
AN - SCOPUS:33847175230
SN - 1381-1169
VL - 264
SP - 192
EP - 201
JO - Journal of Molecular Catalysis A: Chemical
JF - Journal of Molecular Catalysis A: Chemical
IS - 1-2
ER -