N2O Decomposition over Fe-ZSM-5 Studied by Transient Techniques
نویسندگان
چکیده
منابع مشابه
Comprehensive DFT study of nitrous oxide decomposition over Fe-ZSM-5.
The reaction mechanism for nitrous oxide decomposition has been studied on hydrated and dehydrated mononuclear iron sites in Fe-ZSM-5 using density functional theory. In total, 46 different surface species with different spin states (spin multiplicity M(S) = 4 or 6) and 63 elementary reactions were considered. Heats of adsorption, activation barriers, reaction rates, and minimum energy pathways...
متن کاملLow temperature decomposition of nitrous oxide over Fe/ZSM-5: Modelling of the dynamic behaviour
The kinetics of N2O decomposition to gaseous nitrogen and oxygen over HZSM-5 catalysts with low content of iron (<400 ppm) under transient and steady-state conditions was investigated in the temperature range of 250–380 8C. The catalysts were prepared from the HZSM-5 with Fe in the framework upon steaming at 550 8C followed by thermal activation in He at 1050 8C. The N2O decomposition began at ...
متن کاملTheoretical evidence of the observed kinetic order dependence on temperature during the N2O decomposition over Fe-ZSM-5w
The characterization of Fe/ZSM5 zeolite materials, the nature of Fe-sites active in N2O direct decomposition, as well as the rate limiting step are still a matter of debate. The mechanism of N2O decomposition on the binuclear oxo-hydroxo bridged extraframework iron core site [Fe(m-O)(m-OH)Fe] inside the ZSM-5 zeolite has been studied by combining theoretical and experimental approaches. The ove...
متن کاملDynamics of N2O decomposition over HZSM-5 with low Fe content
The dynamics of N2O decomposition to gaseous nitrogen and oxygen over HZSM-5 catalysts with a low iron content (200 and 1000 ppm) was studied by the transient response method in the temperature range 523–653 K. The active catalysts were prepared from HZSM-5 with Fe in the framework on its steaming at 823 K followed by thermal activation in He at 1323 K. Two main steps were distinguished in the ...
متن کاملNitrous oxide decomposition over Fe-ZSM-5 in the presence of nitric oxide: a comprehensive DFT study.
A number of experimental studies have shown recently that ppm-level additions of nitric oxide (NO) enhance the rate of nitrous oxide (N(2)O) decomposition catalyzed by Fe-ZSM-5 at low temperatures. In the present work, the NO-assisted N(2)O decomposition over mononuclear iron sites in Fe-ZSM-5 was studied on a molecular level using density functional theory (DFT) and transition-state theory. A ...
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ژورنال
عنوان ژورنال: Chemical Engineering & Technology
سال: 2009
ISSN: 0930-7516,1521-4125
DOI: 10.1002/ceat.200900248