Kinetic Isotope Effects in the N₂O Decomposition over NiO

Abstract

The 15N and 18O kinetic isotope effects (KIEs) in the catalytic decomposition of nitrous oxide on NiO powder were determined in the temperature range of 625−825 K, and the following temperature dependencies were found: KIE(15N) = (0.821 ± 0.180) + (1445 ± 128)/T and KIE(18O) = (1.384 ± 0.124) + (1450 ± 89)/T. At initial pressures of N2O between 40 and 60 kPa, the reaction is first order in N2O and has an apparent activation energy of 131 ± 3 kJ mol-1. According to Bigeleisen's formalism, a bent, product-like NNO transition state and a fork-type NNOO transition state best fit the experimental results.

Decomposition of nitrous oxide on Fe-doped boron nitride nanotubes: the ligand effect

“…For the chemical catalysis, the transition metals (TMs) play a particularly important role in the controlled activation of the N 2 O in both homogeneous and heterogeneous catalysis. [4][5][6][7][8][9][10][11][12][13][14][15][16] Both experimental and theoretical investigations have been devoted to discovering and explaining the catalytic processes for the N 2 O decomposition. Transition metals deposited on zeoliteand carbon-based materials, metal oxides and also in the form of metal-ligand complexes clearly demonstrated high catalytic activity for this reaction.…”

“…Transition metals deposited on zeoliteand carbon-based materials, metal oxides and also in the form of metal-ligand complexes clearly demonstrated high catalytic activity for this reaction. 5,[8][9][10]12,[14][15][16][17][18] Among these, the Fe-based catalysts, especially the Fe-MFI zeolites, are probably the most extensively studied catalytic materials, using both theoretical and experimental viewpoints, because they provide outstanding activity and stability for the N 2 O decomposition. Recently, the deposition of Fe into the graphene surface presents a good catalytic activity for the N 2 O decomposition.…”