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Hydrothermal Stability of Fe−BEA as an NH3‑SCR Catalyst

Författare och institution:
Soran Shwan (Institutionen för kemi- och bioteknik, Teknisk ytkemi & Kompetenscentrum katalys (KCK)); Radka Nedyalkova (Institutionen för kemi- och bioteknik, Kemisk reaktionsteknik & Kompetenscentrum katalys (KCK)); Jonas Jansson (-); John G. Korsgren (-); Louise Olsson (Institutionen för kemi- och bioteknik, Kemisk reaktionsteknik & Kompetenscentrum katalys (KCK)); Magnus Skoglundh (Institutionen för kemi- och bioteknik, Teknisk ytkemi & Kompetenscentrum katalys (KCK))
Publicerad i:
Industrial & Engineering Chemistry Research, 51 s. 12762−12772
ISSN:
0888-5885
Publikationstyp:
Artikel, refereegranskad vetenskaplig
Publiceringsår:
2012
Språk:
engelska
Fulltextlänk:
Sammanfattning (abstract):
The hydrothermal stability of Fe−BEA as a selective catalytic reduction (SCR) catalyst was experimentally studied. Cordierite supported Fe−BEA samples were hydrothermally treated at 600 and 700 °C for 3−100 h to capture the effect of aging time and temperature. Before and after aging the samples were characterized with BET, XPS, XRD, and NH3-TPD. The catalytic performance of the samples with respect to NO oxidation, NH3 oxidation, and NO reduction (NH3-SCR) was studied by flow reactor experiments to correlate changes of the catalytic performance with structural changes of the zeolite and the iron phases. The NH3-SCR experiments did not show any significant decrease in activity after a short time of aging (3 h at 700 °C)even though the ammonia storage capacity decreased by 40% and the oxidation state of iron slightly increased. A longer time of aging resulted in decreased activity for NO reduction during low temperatures (150−300 °C), while at higher temperatures (400−500 °C) the activity remained high. The results indicate that the NO reduction is more sensitive at low temperatures to changes in the oxidation state of iron caused by hydrothermal aging than at higher temperatures. Furthermore, a maximum in activity for NO oxidation and increased oxidation state of iron (Fe3+) indicate Fe2O3 particle growth.
Ämne (baseras på Högskoleverkets indelning av forskningsämnen):
NATURVETENSKAP ->
Kemi ->
Fysikalisk kemi ->
Spektroskopi
NATURVETENSKAP ->
Kemi ->
Materialkemi
TEKNIK OCH TEKNOLOGIER ->
Nanoteknik
Nyckelord:
SCR, zeolite, BEA, NOx reduction, Catalyst deactivation
Chalmers styrkeområden:
Energi
Materialvetenskap
Nanovetenskap och nanoteknik
Transport
Chalmers fundament:
Grundläggande vetenskaper
Chalmers drivkrafter:
Hållbar utveckling
Postens nummer:
164448
Posten skapad:
2012-10-05 15:30
Posten ändrad:
2012-11-08 12:55

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