On the mutual interactions between noble metal crystallites and zeolitic supports and their impacts on catalysis

J. I. Villegas; D. Kubička; H. Karhu; H. Österholm; N. Kumar; T. Salmi; D. Yu. Murzin

doi:10.1016/j.molcata.2006.09.017

On the mutual interactions between noble metal crystallites and zeolitic supports and their impacts on catalysis

J. I. Villegas
, D. Kubička
, H. Karhu
, H. Österholm
, N. Kumar
, T. Salmi
, D. Yu. Murzin^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › Scientific › peer-review

25 Citations (Scopus)

Abstract

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.

Original language	English
Pages (from-to)	192-201
Number of pages	10
Journal	Journal of Molecular Catalysis A: Chemical
Volume	264
Issue number	1-2
DOIs	https://doi.org/10.1016/j.molcata.2006.09.017
Publication status	Published - 1 Mar 2007
MoE publication type	A1 Journal article-refereed

Funding

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.

Keywords

Interatomic potential model
Mutual metal-support interactions
Zeolites

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title = "On the mutual interactions between noble metal crystallites and zeolitic supports and their impacts on catalysis",

abstract = "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.",

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note = "Funding Information: This work is part of the activities at {\AA}bo Akademi Process Chemistry Centre within the Finnish Centre of Excellence Program (2000{\textendash}2001) by the Academy of Finland. Financial support from the Graduate School of Materials Research and Neste Oil for Jos{\'e} Ignacio Villegas is gratefully acknowledged. Copyright: Copyright 2008 Elsevier B.V., All rights reserved.",

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doi = "10.1016/j.molcata.2006.09.017",

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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

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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.

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On the mutual interactions between noble metal crystallites and zeolitic supports and their impacts on catalysis

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