Investigation of the Effect of Accelerated Hydrothermal Aging on the Cu Sites in a Cu-BEA Catalyst for NH3-SCR Applications
Artikel i vetenskaplig tidskrift, 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

Författare

Norman Wilken

Kompetenscentrum katalys (KCK)

Chalmers, Kemi- och bioteknik, Kemisk reaktionsteknik

Radka Nedyalkova

Chalmers, Kemi- och bioteknik, Kemisk reaktionsteknik

Kompetenscentrum katalys (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, Kemi- och bioteknik, Kemisk reaktionsteknik

Kompetenscentrum katalys (KCK)

Topics in Catalysis

1022-5528 (ISSN) 1572-9028 (eISSN)

Vol. 56 1-8 317-322

Styrkeområden

Transport

Ämneskategorier

Fysikalisk kemi

DOI

10.1007/s11244-013-9973-9

Mer information

Skapat

2017-10-07