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 (KCK)

Chalmers, Kemi- och bioteknik, Kemisk reaktionsteknik

Catur Rini Widyastuti

Kompetenscentrum katalys (KCK)

Chalmers, Kemi- och bioteknik, Kemisk reaktionsteknik

Stanislava Andonova

Kompetenscentrum katalys (KCK)

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 (KCK)

Journal of Catalysis

0021-9517 (ISSN) 1090-2694 (eISSN)

Vol. 311 170-181

Styrkeområden

Transport

Ämneskategorier

Fysikalisk kemi

DOI

10.1016/j.jcat.2013.11.016

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Skapat

2017-10-07