The effect of Cu-loading on different reactions involved in NH3-SCR over Cu-BEA catalysts
Artikel i vetenskaplig tidskrift, 2014
In this study, we investigate the effect of varying copper loading in Cu-BEA on different reactions involved in the SCR mechanism. The catalysts were characterized by BET, ICP-AES, and UV-Vis. Enlarged ammonia storage was observed when increasing the copper loading mainly owing to loosely bonded NH3, but for over-exchanged samples, a new high-temperature shoulder was also observed. The N2O production significantly grew with increasing copper loading. In addition, the reaction rates of NO oxidation and NH3 oxidation per Cu site were higher on the high-loaded copper samples compared to those with lower loading. However, the opposite results were found for NH3 SCR, but differences were small for this reaction. Ammonium nitrate formation and decomposition were examined during a variety of temperature-programmed desorption (TPD) experiments, and three regions related to the presence of acid sites and low- versus high-loaded copper sites were observed. When dosing NO2 before NH3, ammonium nitrate species were formed but in lower amounts than if NH3 and NO2 were dosed simultaneously.
FAST SCR REACTION
P119
P135
CU-ZSM-5
Ammonium nitrate
SCR
1995
AMMONIUM-NITRATE
NITROGEN-OXIDES
1992
CATALYSTS
V55
JOURNAL OF PHYSICAL CHEMISTRY
1978
V80
LOW-TEMPERATURE
SELECTIVE REDUCTION
FE-ZSM-5 CATALYSTS
JOURNAL OF CATALYSIS
V99
NITRIC-OXIDE
JOURNAL OF PHYSICAL CHEMISTRY
EN JP
APPLIED CATALYSIS A-GENERAL
N2O
Cu-BEA
V98
NO DECOMPOSITION
Zeolite
1994
P16327
Nitrous oxide
DECEK J
ZUMOTO M
P5721
Transient response
ZEOLITE CATALYST
DECEK J
Författare
Oana Mihai
Kompetenscentrum katalys
Chalmers, Kemi- och bioteknik, Kemisk reaktionsteknik
Catur Rini Widyastuti
Kompetenscentrum katalys
Chalmers, Kemi- och bioteknik, Kemisk reaktionsteknik
Stanislava Andonova
Kompetenscentrum katalys
Chalmers, Kemi- och bioteknik, Kemisk reaktionsteknik
K. Kamasamudram
Cummins Inc.
J. H. Li
Cummins Inc.
S. Y. Joshi
Cummins Inc.
N. W. Currier
Cummins Inc.
A. Yezerets
Cummins Inc.
Louise Olsson
Chalmers, Kemi- och bioteknik, Kemisk reaktionsteknik
Kompetenscentrum katalys
Journal of Catalysis
0021-9517 (ISSN) 1090-2694 (eISSN)
Vol. 311 170-181Styrkeområden
Transport
Ämneskategorier
Fysikalisk kemi
DOI
10.1016/j.jcat.2013.11.016