Abstract
NO x adsorption behavior on LaFeO 3 (LFO) and LaMnO 3+ δ (LMO) was characterized using temperature controlled methods and mass spectrometry. Temperature program desorption revealed decomposition of complex surface species formation when NO or NO 2 was adsorbed on LFO and LMO. LFO exhibited higher adsorption capacity for NO x species than LMO and was shown to be more active for NO x surface conversion. Both effects were attributed to the different B-site cations, with iron in LFO in the 3+ valence state, and manganese in LMO in the 3+ and 4+ valence states. Results from diffuse reflectance infrared spectroscopy were used to identify specific nitrite and nitrate species that are formed on the surfaces of LFO and LMO at room temperature. Temperature programmed reaction revealed a complex NO 2 decomposition mechanism to NO and O 2 for LFO and LMO in which the formation of nitrite and nitrate species serve as intermediates below ∼600 °C. NO x sensing mechanisms were considered and predicted based on the types and quantities of surface species formed.
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