TY - JOUR
T1 - On the NO decomposition by Cu-ZSM-5 through the ZCu(NO2)(NO) or ZCu(N2O3) intermediates
AU - Solans-Monfort, Xavier
AU - Branchadell, Vicenç
AU - Sodupe, Mariona
PY - 2002/2/14
Y1 - 2002/2/14
N2 - The geometries and harmonic vibrational frequencies of several possible intermediates involved in the NO decomposition mechanism catalyzed by Cu-ZSM5: ZCu(NO2)(NO), ZCu(N2O3), ZCu(N2O)(O2), ZCu(N2O), and ZCu(O2), have been determined using the B3LYP density functional approach and a tritetrahedral model for the zeolite. Results show that, although ZCu(NO2)(NO) and ZCu(N2O3) species are very stable with respect to the ground state ZCuO + 2NO asymptote, the NO decomposition is not expected to proceed through these intermediates. At high temperatures, formation of ZCu(O2) may occur from ZCuO + 2NO through a ZCu(OONNO) like transition state in the triplet surface. This pathway may compete with the one previously reported for the O-transfer to ZCuO from N2O and, thus, should be considered to understand the observed reactivity.
AB - The geometries and harmonic vibrational frequencies of several possible intermediates involved in the NO decomposition mechanism catalyzed by Cu-ZSM5: ZCu(NO2)(NO), ZCu(N2O3), ZCu(N2O)(O2), ZCu(N2O), and ZCu(O2), have been determined using the B3LYP density functional approach and a tritetrahedral model for the zeolite. Results show that, although ZCu(NO2)(NO) and ZCu(N2O3) species are very stable with respect to the ground state ZCuO + 2NO asymptote, the NO decomposition is not expected to proceed through these intermediates. At high temperatures, formation of ZCu(O2) may occur from ZCuO + 2NO through a ZCu(OONNO) like transition state in the triplet surface. This pathway may compete with the one previously reported for the O-transfer to ZCuO from N2O and, thus, should be considered to understand the observed reactivity.
U2 - 10.1021/jp0130620
DO - 10.1021/jp0130620
M3 - Article
SN - 1089-5647
VL - 106
SP - 1372
EP - 1379
JO - Journal of Physical Chemistry B
JF - Journal of Physical Chemistry B
IS - 6
ER -