132074 20240301161205.0 doi 10.1016/j.combustflame.2018.07.005 sideral 107674 ART-2018-107674 eng Marrodán, L. Universidad de Zaragoza (orcid)0000-0002-7767-3057 The inhibiting effect of NO addition on dimethyl ether high-pressure oxidation 2018 The high-pressure dimethyl ether (DME, CH3OCH3) oxidation has been investigated in a plug flow reactor in the 450–1050 K temperature range. Different pressures (20, 40 and 60 bar), air excess ratios (¿ = 0.7, 1 and 35), and the absence/presence of NO have been tested, for the first time under these conditions. An early reactivity of DME and a negative temperature coefficient (NTC) zone have been observed under the studied conditions, although under very oxidizing conditions (¿ = 35), NTC zone is almost imperceptible because DME is completely consumed at lower temperatures. A chemical kinetic mechanism has been used to describe the DME high-pressure oxidation, with a good agreement with the experimental trends observed. In general, modeling calculations with the present mechanism have been successfully compared with experimental data from literature. The presence of NO has an inhibiting effect on DME high-pressure consumption at low-temperatures because of: (i) the competition between CH3OCH2+O2¿CH3OCH2O2 and CH3OCH2+NO2¿CH3OCH2O+NO reactions, and (ii) the participation of NO in CH3OCH2O2+NO¿CH3OCH2O+NO2 reaction, preventing CH3OCH2O2 radicals continue reacting through a complex mechanism, which includes a second O2 addition and several isomerizations and decompositions, during which highly reactive OH radicals are generated. Consequently, NO and NO2 are interchanged in a cycle but never consumed. Access copy available to the general public Unrestricted info:eu-repo/grantAgreement/ES/MINECO/CTQ2015-65226 info:eu-repo/semantics/openAccess by-nc-nd http://creativecommons.org/licenses/by-nc-nd/3.0/es/ 4.12 2018 ENGINEERING, MECHANICAL 12 / 129 = 0.093 2018 Q1 T1 ENGINEERING, CHEMICAL 23 / 137 = 0.168 2018 Q1 T1 ENGINEERING, MULTIDISCIPLINARY 10 / 88 = 0.114 2018 Q1 T1 THERMODYNAMICS 6 / 60 = 0.1 2018 Q1 T1 ENERGY & FUELS 30 / 103 = 0.291 2018 Q2 T1 1.29 2018 Chemical Engineering (miscellaneous) 2018 Q1 Chemistry (miscellaneous) 2018 Q1 Physics and Astronomy (miscellaneous) 2018 Q1 Fuel Technology 2018 Q1 Energy Engineering and Power Technology 2018 Q1 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion Arnal, Á.J. (orcid)0000-0002-5971-6842 Millera, Á. Universidad de Zaragoza (orcid)0000-0001-5426-6486 Bilbao, R. Universidad de Zaragoza (orcid)0000-0002-5420-0943 Alzueta, M.U. Universidad de Zaragoza (orcid)0000-0003-4679-5761 5005 555 Universidad de Zaragoza Dpto. Ing.Quím.Tecnol.Med.Amb. Área Ingeniería Química 5005 790 Universidad de Zaragoza Dpto. Ing.Quím.Tecnol.Med.Amb. Área Tecnologi. Medio Ambiente 197 (2018), 1-10 Combust. flame Combustion and Flame 0010-2180 756218 http://zaguan.unizar.es/record/132074/files/texto_completo.pdf Postprint 1547018 http://zaguan.unizar.es/record/132074/files/texto_completo.jpg?subformat=icon icon Postprint oai:zaguan.unizar.es:132074 articulos driver 2024-03-01-14:37:24 ARTICLE