Oxidation of Dimethyl Ether and its Interaction with Nitrogen Oxides

摘要: The oxidation of dimethyl ether (DME) under flow reactor conditions has been studied experimentally and in terms a detailed chemical kinetic model. experiments were performed at atmospheric pressure the temperature range 600–1500 K different air/fuel ratios. Of particular interest was interaction DME with nitrogen oxides. results show that occurs readily temperatures above 1000 K, largely independent stoichiometry. Addition NO stoichiometric fuel-rich does not affect chemistry for DME, but 1100 minor amount is reduced to HCN N2 reburn-type reactions. or NO2 oxidizing significantly enhances rate shifts onset lower values, phenomenon similar NOx-sensitized hydrocarbons. The proposed model provides good description absence Under present study, conversion proceeds mainly through high-temperature mechanism, little importance intermediate peroxy species. In presence NO2, reaction CH3 + ⇌ CH3O NO, followed by dissociation CH3O, H atoms thereby promotes oxidation. At mechanism involves CH3OCH2O2 CH3O2 radicals. While effect NOx generally described satisfactorily model, deviations may indicate inadequacies subset these