Conversion of NO to N2O on MgO Thin Films

No adsorption on ultra-thin MgO films grown on a Mo(100) substrate result in formation of N2O at low temp. (120 K). Also, small amts. of N2O are produced at 280 K. Isotope exchange expts. showed the reaction does not involve lattice O. Ab-initio DFT/B3LYP cluster model calcns. were performed to understand the reaction mechanism, considering various defect sites on the MgO surface. The reaction occurs preferentially at neutral O vacancies (F centers) via adsorption of a first NO mol. followed by the addn. of a second NO; from the adsorbed dimer, N2O2, N2O forms with an activation barrier of ∼0.1 eV, leaving a regular site instead of the original F center. This result is consistent with exptl. observations that subsequent exposure of the surface to NO results in reduced N2O prodn. [on SciFinder(R)]     «

No adsorption on ultra-thin MgO films grown on a Mo(100) substrate result in formation of N2O at low temp. (120 K). Also, small amts. of N2O are produced at 280 K. Isotope exchange expts. showed the reaction does not involve lattice O. Ab-initio DFT/B3LYP cluster model calcns. were performed to understand the reaction mechanism, considering various defect sites on the MgO surface. The reaction occurs preferentially at neutral O vacancies (F centers) via adsorption of a first NO mol. followed by...     »

Reduction catalysts (magnesium oxide thin films reaction temp. and oxygen vacancy effect on exhaust gas nitric oxide conversion to nitrous oxide following adsorption on ultra-thin magnesium oxide films grown on molybdenum substrate) Adsorption Exhaust gases (reaction temp. and oxygen vacancy effect on exhaust gas nitric oxide conversion to nitrous oxide following adsorption on ultra-thin magnesium oxide films grown on molybdenum substrate) nitric oxide conversion nitrous oxide magnesium oxide thin film exhaust gas nitric oxide conversion redn catalyst molybdenum supported magnesium oxide thin film catalyst     «

Reduction catalysts (magnesium oxide thin films reaction temp. and oxygen vacancy effect on exhaust gas nitric oxide conversion to nitrous oxide following adsorption on ultra-thin magnesium oxide films grown on molybdenum substrate) Adsorption Exhaust gases (reaction temp. and oxygen vacancy effect on exhaust gas nitric oxide conversion to nitrous oxide following adsorption on ultra-thin magnesium oxide films grown on molybdenum substrate) nitric oxide conversion nitrous oxide magnesium oxide th...     »

CAN 137:205436 59-3 Air Pollution and Industrial Hygiene Dipartimento di Scienza dei Materiali, Istituto Nazionale per la Fisica della Materia, Universita di Milano-Bicocca, Milan, Italy. Journal 1089-5647 1309-48-4 (Magnesium oxide) Role: CAT (Catalyst use), NUU (Other use, unclassified), PRP (Properties), USES (Uses) (adsorbent and catalyst; reaction temp. and oxygen vacancy effect on exhaust gas nitric oxide conversion to nitrous oxide following adsorption on ultra-thin magnesium oxide films grown on molybdenum substrate); 7439-98-7 (Molybdenum) Role: CAT (Catalyst use), USES (Uses) (magnesium oxide thin film substrate; reaction temp. and oxygen vacancy effect on exhaust gas nitric oxide conversion to nitrous oxide following adsorption on ultra-thin magnesium oxide films grown on molybdenum substrate); 7727-37-9 (Nitrogen); 10024-97-2 (Nitrous oxide) Role: CPS (Chemical process), FMU (Formation, unclassified), PEP (Physical, engineering or chemical process), FORM (Formation, nonpreparative), PROC (Process) (reaction temp. and oxygen vacancy effect on exhaust gas nitric oxide conversion to nitrous oxide following adsorption on ultra-thin magnesium oxide films grown on molybdenum substrate); 10102-43-9 (Nitric oxide) Role: CPS (Chemical process), PEP (Physical, engineering or chemical process), POL (Pollutant), REM (Removal or disposal), OCCU (Occurrence), PROC (Process) (reaction temp. and oxygen vacancy effect on exhaust gas nitric oxide conversion to nitrous oxide following adsorption on ultra-thin magnesium oxide films grown on molybdenum substrate)     «

CAN 137:205436 59-3 Air Pollution and Industrial Hygiene Dipartimento di Scienza dei Materiali, Istituto Nazionale per la Fisica della Materia, Universita di Milano-Bicocca, Milan, Italy. Journal 1089-5647 1309-48-4 (Magnesium oxide) Role: CAT (Catalyst use), NUU (Other use, unclassified), PRP (Properties), USES (Uses) (adsorbent and catalyst; reaction temp. and oxygen vacancy effect on exhaust gas nitric oxide conversion to nitrous oxide following adsorption on ultra-thin magnesium oxide films...     »