Vermiculite-supported FeCe bimetallic catalyst for selective catalytic reduction of NO with CO
NO removal by CO selective catalytic reduction(CO-SCR)has gained great attentions.In this paper,vermiculite-supported Fe-Ce bimetallic oxides(FeCe/VMT)for CO-SCR were prepared by coprecipitation-assisted impregnation(CP-IM)with the natural mineral vermiculite as the carrier.The characterization results showed that compared with the traditional impregnation method(IM),FeCe/VMT(CP-IM)prepared by coprecipitation-assisted impregnation had larger specific surface area(106.9m2/g)and more oxygen vacancies due to more active sites available.The enhanced synergistic effect between FeCe was beneficial to the increase of both catalytic activity and stability in CO-SCR reaction.Performance tests showed that NO conversion reached 100%at 300℃ with 50000h-1 gas hourly space velocity(GHSV),and the performance of the catalyst didn't decrease within 48h.When the temperature dropped to 250℃,the conversion of NO could still reach 97%.At the same time,in situ infrared spectroscopy and density functional theory were used to reveal the corresponding catalytic mechanism.This research provided a promising method for preparing supported catalysts with large specific surface area.