TY - JOUR
T1 - Deactivation of a Fe-ZSM-5 catalyst during the selective catalytic reduction of NO by n-decane
T2 - An operando DRIFT study
AU - Delahay, Gérard
AU - Guzmán-Vargas, Ariel
AU - Coq, Bernard
N1 - Funding Information:
A. Guzmán-Vargas thanks CONACYT (Mexico) for a scholarship. This project was financially supported by the “Agence De l’Environement et de la Maitrise de l’Energie”, grant no. 01747064 (ADEME, France).
PY - 2007/1/31
Y1 - 2007/1/31
N2 - The selective catalytic reduction (SCR) of NO by n-decane was investigated on a Fe-ZSM-5 prepared by the FeCl3 sublimation method. NO conversion profiles versus temperature were followed in both temperature programmed surface reaction (TPSR, 10 °C min-1) and steady state experiments. A higher NO conversion with a maximum of ca. 80% at 400 °C is observed in the course of the TPSR tests. This phenomenon has been attributed to strong adsorption of n-decane which protects the active sites against the poisoning. Indeed, in steady state experiments at 390 °C the strong decrease of activity as a function of time on stream is due to the polymerisation of conjugated nitriles. This study indicates that long chain alkanes are not the most adequate reductants of NO for high temperature SCR applications. Moreover, due to an easier polymerization of conjugated nitriles on iron zeolites (stronger Fe Lewis sites), this type of catalyst seems less attractive than Cu-zeolite catalysts for the SCR of NO by hydrocarbons in this respect.
AB - The selective catalytic reduction (SCR) of NO by n-decane was investigated on a Fe-ZSM-5 prepared by the FeCl3 sublimation method. NO conversion profiles versus temperature were followed in both temperature programmed surface reaction (TPSR, 10 °C min-1) and steady state experiments. A higher NO conversion with a maximum of ca. 80% at 400 °C is observed in the course of the TPSR tests. This phenomenon has been attributed to strong adsorption of n-decane which protects the active sites against the poisoning. Indeed, in steady state experiments at 390 °C the strong decrease of activity as a function of time on stream is due to the polymerisation of conjugated nitriles. This study indicates that long chain alkanes are not the most adequate reductants of NO for high temperature SCR applications. Moreover, due to an easier polymerization of conjugated nitriles on iron zeolites (stronger Fe Lewis sites), this type of catalyst seems less attractive than Cu-zeolite catalysts for the SCR of NO by hydrocarbons in this respect.
KW - Deactivation
KW - Iron
KW - NO
KW - Selective catalytic reduction
KW - Zeolite
KW - n-Decane
UR - http://www.scopus.com/inward/record.url?scp=33845641837&partnerID=8YFLogxK
U2 - 10.1016/j.apcatb.2005.10.032
DO - 10.1016/j.apcatb.2005.10.032
M3 - Artículo
SN - 0926-3373
VL - 70
SP - 45
EP - 52
JO - Applied Catalysis B: Environmental
JF - Applied Catalysis B: Environmental
IS - 1-4
ER -