Abstract
A series of Mn-Co/TiO2 catalysts were prepared by wet impregnation method and evaluated for the oxidation of NO to NO2. The effects of Co amounts and calcination temperature on NO oxidation were investigated in detail. The catalytic oxidation ability in the temperature range of 403–473 K was obviously improved by doping cobalt into Mn/TiO2. These samples were characterized by nitrogen adsorption-desorption, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscope (TEM) and hydrogen temperature programmed reduction (H2-TPR). The results indicated that the formation of dispersed Co3O4·CoMnO3 mixed oxides through synergistic interaction between Mn-O and Co-O was directly responsible for the enhanced activities towards NO oxidation at low temperatures. Doping of Co enhanced Mn4+ formation and increased chemical adsorbed oxygen amounts, which also accelerated NO oxidation.
Highlights
Nitrogen oxides (NOx ) in the exhaust from stationary and mobile sources are toxic to human’s health and have brought environmental problems, such as photochemical smog, acid rain and ozone depletion
For selective catalytic reduction (SCR), NO2 is favored for NOx conversion according to the so-called Fast SCR reaction, which is thought to be faster by one order of magnitude than the Standard SCR reaction under oxidizing conditions [2]
Special attention was paidthe to interactions the Mn‐O‐Co mixed oxides which and can manganese change the temperatures were investigated to determine between cobalt oxides properties of the catalysts and enhance the oxidation ability
Summary
Nitrogen oxides (NOx ) in the exhaust from stationary and mobile sources are toxic to human’s health and have brought environmental problems, such as photochemical smog, acid rain and ozone depletion. Mn-based catalysts have been proven to be highly active for the low-temperature SCR reaction, which would avoid the disadvantages associated with the commercial high-temperature catalysts. As reported in the [22,23], Mnhave oxides notreported only acted as highly efficient SCR catalysts, but showed. 2 catalysts have been evaluated for the low the literature [22,23], Mn oxides acted as highly efficient SCR catalysts, and showed temperature. Special attention was paidthe to interactions the Mn‐O‐Co mixed oxides which and can manganese change the temperatures were investigated to determine between cobalt oxides properties of the catalysts and enhance the oxidation ability. Special attention was paid to the Mn-O-Co mixed oxides which can change the properties characterized byand means of N2the adsorption‐desorption, diffraction (XRD), transmission electron of the catalysts enhance oxidation ability. X-ray photoelectron spectroscopy (XPS) and hydrogen temperature-programmed reduction (H -TPR)
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
