کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
740749 894186 2011 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
NOx adsorption behavior of LaFeO3 and LaMnO3+δ and its influence on potentiometric sensor response
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
NOx adsorption behavior of LaFeO3 and LaMnO3+δ and its influence on potentiometric sensor response
چکیده انگلیسی

NOx adsorption behavior on LaFeO3 (LFO) and LaMnO3+δ (LMO) was characterized using temperature controlled methods and mass spectrometry. Temperature program desorption revealed decomposition of complex surface species formation when NO or NO2 was adsorbed on LFO and LMO. LFO exhibited higher adsorption capacity for NOx species than LMO and was shown to be more active for NOx 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 NO2 decomposition mechanism to NO and O2 for LFO and LMO in which the formation of nitrite and nitrate species serve as intermediates below ∼600 °C. NOx sensing mechanisms were considered and predicted based on the types and quantities of surface species formed.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Sensors and Actuators B: Chemical - Volume 158, Issue 1, 15 November 2011, Pages 159–170
نویسندگان
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