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  4. Deactivation Aspects of Methane Oxidation Catalysts Based on Palladium and ZSM-5
 
research article

Deactivation Aspects of Methane Oxidation Catalysts Based on Palladium and ZSM-5

Petrov, Andrey W.
•
Ferri, Davide
•
Tarik, Mohamed
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2017
Topics In Catalysis

Catalytic methane oxidation is used in exhaust gas after treatment to reduce methane emissions in stationary combustion processes as well as in natural gas vehicles. Pd/zeolite catalysts provide higher activity than the commonly used Pd/Al2O3, but suffer from rapid deactivation under reaction conditions and in the presence of steam. This work presents a detailed study of deactivation of 1 wt% Pd/H-ZSM-5 catalyst in reaction conditions in dry and wet feed including characterization of both the active phase and the support. Initially well-dispersed PdO particles are not stable and sinter immediately after the exposure to the reaction mixture even in dry feed and stabilize at lower dispersion level. Despite the reasonable methane oxidation activity exhibited by the large particles, the initial PdO particles could potentially provide a 40 degrees C lower methane oxidation temperature. In the presence of water in the feed at moderate temperature (450 degrees C), support degradation governs the deactivation of the catalyst, which is evidenced by a significant decrease in BET surface area and generation of extra-framework aluminium species. These results suggest that active and stable catalysts could be obtained by careful choice and design of the support material with the aim to guarantee high dispersion of PdO.

  • Details
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Type
research article
DOI
10.1007/s11244-016-0724-6
Web of Science ID

WOS:000395015100010

Author(s)
Petrov, Andrey W.
Ferri, Davide
Tarik, Mohamed
Kroecher, Oliver
Bokhoven, Jeroen A. Van
Date Issued

2017

Publisher

Springer Verlag

Published in
Topics In Catalysis
Volume

60

Issue

1-2

Start page

123

End page

130

Subjects

Methane oxidation

•

Exhaust aftertreatment

•

Palladium

•

Zeolite

•

Deactivation

•

Ageing

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
GR-LUD  
GR-KRO  
Available on Infoscience
May 1, 2017
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/136633
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