Abundant Oxygen Vacancies Induced by the Mechanochemical Process Boost the Low-Temperature Catalytic Performance of MnO2 in NH3-SCR
نویسندگان
چکیده
Manganese oxides (MnOx) have attracted particular attention in the selective catalytic reduction of NOx with NH3 (NH3-SCR) because their excellent low-temperature activity. Herein, we prepared a highly efficient MnO2 (MnO2-M) catalyst through facile ball milling-assisted redox strategy. MnO2-M shows 90% conversion wide operating temperature window 75–200 °C under gas hourly space velocity 40,000 h−1, which is much more active than by method without ball-milling process. Moreover, exhibits better H2O and SO2 resistance. The enhanced properties originated from high surface area, abundant oxygen vacancies, acid sites, higher Mn4+ content induced In situ DRIFTS studies probed reaction intermediates, SCR was deduced to proceed via typical Eley–Rideal mechanism. This work provides enhance performance Mn-based catalysts for denitrification deep insights into NH3-SCR
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ژورنال
عنوان ژورنال: Catalysts
سال: 2022
ISSN: ['2073-4344']
DOI: https://doi.org/10.3390/catal12101291