Isothermal oscillations during N2O decomposition over Fe/ZSM-5: effect of H2O vapor

El-M. El-Malki; R.A. Santen, van; W.M.H. Sachtler

doi:10.1016/S1387-1811(99)00224-3

Isothermal oscillations during N2O decomposition over Fe/ZSM-5: effect of H2O vapor

El-M. El-Malki, R.A. Santen, van, W.M.H. Sachtler

Inorganic Materials & Catalysis

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Abstract

The decomposition of N2O to N-2 and O-2 in diluted feed streams is catalyzed by Fe/ZSM-5 prepared by sublimation. Under certain conditions stable oscillations occur which have been monitored by mass spectrometry. The phenomenology differs characteristically from that of the oscillating N2O decomposition observed over other catalysts. Excess O-2 has only a small effect on the reaction rate and oscillation frequency but water, besides lowering the reaction rate, is found to be crucial for isothermal oscillations on this catalyst. The occurrence of such oscillations indicates that two different states of catalytic activity exist. FTIR shows that the same chemisorbed nitro/nitrate groups are formed as found previously upon exposing the same catalyst to NO+O-2. This suggests that binuclear oxygen bridged complexes play an important role in this chemistry. (C) 2000 Elsevier Science B.V. All rights reserved

Original language	English
Pages (from-to)	235-244
Number of pages	10
Journal	Microporous and Mesoporous Materials
Volume	35-36
DOIs	https://doi.org/10.1016/S1387-1811(99)00224-3
Publication status	Published - 2000

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title = "Isothermal oscillations during N2O decomposition over Fe/ZSM-5: effect of H2O vapor",

abstract = "The decomposition of N2O to N-2 and O-2 in diluted feed streams is catalyzed by Fe/ZSM-5 prepared by sublimation. Under certain conditions stable oscillations occur which have been monitored by mass spectrometry. The phenomenology differs characteristically from that of the oscillating N2O decomposition observed over other catalysts. Excess O-2 has only a small effect on the reaction rate and oscillation frequency but water, besides lowering the reaction rate, is found to be crucial for isothermal oscillations on this catalyst. The occurrence of such oscillations indicates that two different states of catalytic activity exist. FTIR shows that the same chemisorbed nitro/nitrate groups are formed as found previously upon exposing the same catalyst to NO+O-2. This suggests that binuclear oxygen bridged complexes play an important role in this chemistry. (C) 2000 Elsevier Science B.V. All rights reserved",

author = "El-M. El-Malki and {Santen, van}, R.A. and W.M.H. Sachtler",

year = "2000",

doi = "10.1016/S1387-1811(99)00224-3",

language = "English",

volume = "35-36",

pages = "235--244",

journal = "Microporous and Mesoporous Materials",

issn = "1387-1811",

publisher = "Elsevier B.V.",

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TY - JOUR

T1 - Isothermal oscillations during N2O decomposition over Fe/ZSM-5: effect of H2O vapor

AU - El-Malki, El-M.

AU - Santen, van, R.A.

AU - Sachtler, W.M.H.

PY - 2000

Y1 - 2000

N2 - The decomposition of N2O to N-2 and O-2 in diluted feed streams is catalyzed by Fe/ZSM-5 prepared by sublimation. Under certain conditions stable oscillations occur which have been monitored by mass spectrometry. The phenomenology differs characteristically from that of the oscillating N2O decomposition observed over other catalysts. Excess O-2 has only a small effect on the reaction rate and oscillation frequency but water, besides lowering the reaction rate, is found to be crucial for isothermal oscillations on this catalyst. The occurrence of such oscillations indicates that two different states of catalytic activity exist. FTIR shows that the same chemisorbed nitro/nitrate groups are formed as found previously upon exposing the same catalyst to NO+O-2. This suggests that binuclear oxygen bridged complexes play an important role in this chemistry. (C) 2000 Elsevier Science B.V. All rights reserved

AB - The decomposition of N2O to N-2 and O-2 in diluted feed streams is catalyzed by Fe/ZSM-5 prepared by sublimation. Under certain conditions stable oscillations occur which have been monitored by mass spectrometry. The phenomenology differs characteristically from that of the oscillating N2O decomposition observed over other catalysts. Excess O-2 has only a small effect on the reaction rate and oscillation frequency but water, besides lowering the reaction rate, is found to be crucial for isothermal oscillations on this catalyst. The occurrence of such oscillations indicates that two different states of catalytic activity exist. FTIR shows that the same chemisorbed nitro/nitrate groups are formed as found previously upon exposing the same catalyst to NO+O-2. This suggests that binuclear oxygen bridged complexes play an important role in this chemistry. (C) 2000 Elsevier Science B.V. All rights reserved

U2 - 10.1016/S1387-1811(99)00224-3

DO - 10.1016/S1387-1811(99)00224-3

M3 - Article

SN - 1387-1811

VL - 35-36

SP - 235

EP - 244

JO - Microporous and Mesoporous Materials

JF - Microporous and Mesoporous Materials

ER -

Isothermal oscillations during N2O decomposition over Fe/ZSM-5: effect of H2O vapor

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