Abstract
Monolithic Mn-Fe-Ce-Al-O catalyst with honeycomb cordierite ceramic as a carrier was reported for the first time for low temperature deNOx application. In the reaction of selective catalytic reduction (SCR) of NO with NH3, a NO conversion of above 80% at 100 °C was obtained. Notably, the catalyst also showed excellent resistance against SO2 and H2O. About 60% NO conversion was maintained after successive operation in the mixed stream of SO2 and H2O for 168 h. The Brunner−Emmet−Teller (BET) measurement, SEM, EDS, thermogravimetric analysis (TG), FT-IR, and XPS results of the used catalysts indicated that certain amounts of ammonium sulfate was formed on the surface of the catalyst. XPS results revealed that partial of Fe2+ was oxidized to Fe3+ during the reaction process, and Fe2+ species have strong redox ability, which can explain the decrease in activity after reaction. In addition, SO2 and H2O induced a transformation of Ce from Ce4+ to Ce3+ on the surface of the catalyst, which increased the amount of chemisorbed oxygen. Owing to these factors, the addition of Ce and Fe species contributes to excellent resistance of the catalyst to SO2 and H2O.
Highlights
As global air pollutants, nitrogen oxides (NOx ) emitted due to high-temperature combustion processes have caused diverse environment problems such as photochemical smog and ozone [1,2,3].Generally, NOx emission contains two parts, i.e., stationary and mobile sources
Monolithic Mn-Fe-Ce-Al-O catalyst was explored for the first time as an efficient catalyst for deNOx at low temperature
The NO conversion of the catalyst obtains more than 80% at the reaction temperature of 100 ◦ C without SO2 and H2 O
Summary
Nitrogen oxides (NOx ) emitted due to high-temperature combustion processes have caused diverse environment problems such as photochemical smog and ozone [1,2,3]. NOx emission contains two parts, i.e., stationary and mobile sources. The control of NOx emission from stationary sources is still a big challenge, for non-electric fields including steel, cement, coking, glass, and other industries. Selective catalytic reduction (SCR) in NOx with NH3 is currently the main applied method for treatment of NOx from stationary sources. The compositions of commercial SCR catalysts are. For other industries like steel, etc., the temperature is usually lower than 250 ◦ C, and the application of commercial SCR catalysts has been limited. The development of novel vanadium-free catalysts with high efficiency at low temperatures has become very urgent
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