NDLI: Investigation of the Effect of Accelerated Hydrothermal Aging on the Cu Sites in a Cu-BEA Catalyst for NH$

Content Provider	Springer Nature Link
Author	Wilken, rman Nedyalkova, Radka Kamasamudram, Krishna Li, Junhui Currier, Neal W. Vedaiyan, Ramya Yezerets, Aleksey Olsson, Louise
Copyright Year	2013
Abstract	The influence of hydrothermal aging between 500 and 900 °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 °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 °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.
Starting Page	317
Ending Page	322
Page Count	6
File Format	PDF
ISSN	10225528
Journal	Topics in Catalysis
Volume Number	56
Issue Number	1-8
e-ISSN	15729028
Language	English
Publisher	Springer US
Publisher Date	2013-03-13
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Accelerated hydrothermal aging NH$_{3}$ SCR Cu Beta Zeolite XPS XRD BET UV–Vis spectroscopy Flow reactor experiments Catalysis Physical Chemistry Pharmacy Industrial Chemistry/Chemical Engineering Characterization and Evaluation of Materials
Content Type	Text
Resource Type	Article
Subject	Chemistry Catalysis

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