Investigation of the Effect of Accelerated Hydrothermal Aging on the Cu Sites in a Cu-BEA Catalyst for NH3-SCR Applications
Journal article, 2013
The influence of hydrothermal aging between 500 and 900 A degrees C for 3 h, on the structure of a Cu-Beta catalyst was studied in this work. The XRD measurements indicated a structural breakdown of the zeolite upon 900 A degrees C hydrothermal aging. This was confirmed from the loss of surface area as measured by BET method. The temperature for the zeolite structure break down was different between the powder bed as opposed to the sample that was washcoated on a cordierite monolith, which was most likely due to slightly different aging conditions and the presence of binders. The strong increase in the intensity of the Cu2p XPS peak indicated that the surface is enriched of copper at higher temperatures due to the zeolite structure collapse. The presence of CuO is usually accompanied by a satellite peak, which was clearly observed at higher binding energies for the catalysts aged at 800 and 900 A degrees C. The XPS results are in good agreement with the UV-Vis experiments, which also point to the formation of copper oxide after high temperature aging.
BET
Flow reactor experiments
Accelerated hydrothermal aging
XRD
XPS
Zeolite
Cu
Beta
UV-Vis spectroscopy
NH3 SCR
Author
Norman Wilken
Competence Centre for Catalysis (KCK)
Chalmers, Chemical and Biological Engineering, Chemical Reaction Engineering
Radka Nedyalkova
Chalmers, Chemical and Biological Engineering, Chemical Reaction Engineering
Competence Centre for Catalysis (KCK)
K. Kamasamudram
Cummins Inc.
J. H. Li
Cummins Inc.
N. W. Currier
Cummins Inc.
R. Vedaiyan
Cummins Inc.
A. Yezerets
Cummins Inc.
Louise Olsson
Chalmers, Chemical and Biological Engineering, Chemical Reaction Engineering
Competence Centre for Catalysis (KCK)
Topics in Catalysis
1022-5528 (ISSN) 1572-9028 (eISSN)
Vol. 56 1-8 317-322Areas of Advance
Transport
Subject Categories (SSIF 2011)
Physical Chemistry
DOI
10.1007/s11244-013-9973-9