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Abstract
NO and O2 coadsorption on γ-Al2O3-supported Tb4O7, La2O3, BaO, and MgO has been investigated by in situ infrared spectroscopy coupled with temperature-programmed decomposition and desorption. BaO/γ-Al2O3 and MgO/γ-Al2O3 possess a higher NOx storage capability than Tb4O7/γ-Al2O3 and La2O3/γ-Al2O3. NO/O2 coadsorbed on Tb4O7, La2O3, and BaO in the form of bridging bidentate, chelating bidentate, and monodentate nitrates, and on MgO in the form of bridging bidentate and monodentate nitrates via the reaction of adsorbed NO with adsorbed oxygen at 298 K. NO/O2 coadsorbed as a chelating bidentate nitrate on Tb4O7 and La2O3, and as a distinctive bridging bidentate nitrate on BaO and MgO via the reaction of adsorbed NO with surface lattice oxygen at 523 K. These various forms of adsorbed nitrate differ in structure and reactivity from Tb(NO3)3, La(NO3)3, Ba(NO3)2, and Mg(NO3)2, the precursor used to prepare metal oxides for NO/O2 coadsorption. Temperature-programmed desorption (TPD) of chelating bidentate nitrate ...
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