Abstract
In this study, in situ transmission FT-IR spectroscopy was employed to investigate the thermal and selective catalytic reduction of NO 2 with propylene in nanocrystalline NaY zeolite. NO was the major product in the thermal reduction of NO 2. In absence of oxygen and water, selective catalytic reduction of NO 2 with propylene at low temperatures ( T ≤ 473 K) resulted in the complete reduction of NO 2 to N 2 and O 2. Isocyanate and nitrile species formed on extra framework alumina sites are found to be important intermediates. Based on kinetic studies, a pathway involving radical reactions appears to be the most plausible mechanism for the complete reduction of NO 2.
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