title: In situ supported MnO(x)-CeO(x) on carbon nanotubes for the low-temperature selective catalytic reduction of NO with NH3.
abstract: The MnO(x) and CeO(x) were in situ supported on carbon nanotubes (CNTs) by a poly(sodium 4-styrenesulfonate) assisted reflux route for the low-temperature selective catalytic reduction (SCR) of NO with NH(3). X-Ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution TEM (HRTEM), X-ray photoelectron spectroscopy (XPS), H(2) temperature-programmed reduction (H(2)-TPR) and NH(3) temperature-programmed desorption (NH(3)-TPD) have been used to elucidate the structure and surface properties of the obtained catalysts. It was found that the in situ prepared catalyst exhibited the highest activity and the most extensive operating-temperature window, compared to the catalysts prepared by impregnation or mechanically mixed methods. The XRD and TEM results indicated that the manganese oxide and cerium oxide species had a good dispersion on the CNT surface. The XPS results demonstrated that the higher atomic concentration of Mn existed on the surface of CNTs and the more chemisorbed oxygen species exist. The H(2)-TPR results suggested that there was a strong interaction between the manganese oxide and cerium oxide on the surface of CNTs. The NH(3)-TPD results demonstrated that the catalysts presented a larger acid amount and stronger acid strength. In addition, the obtained catalysts exhibited much higher SO(2)-tolerance and improved the water-resistance as compared to that prepared by impregnation or mechanically mixed methods.
authors.affiliation: Research Center of Nano Science and Technology, Shanghai University, Shanghai 200444, China. dszhang@shu.edu.cn
authors.forename: Dengsong
authors.initials: D
authors.lastname: Zhang
authors.forename: Lei
authors.initials: L
authors.lastname: Zhang
authors.forename: Liyi
authors.initials: L
authors.lastname: Shi
authors.forename: Cheng
authors.initials: C
authors.lastname: Fang
authors.forename: Hongrui
authors.initials: H
authors.lastname: Li
authors.forename: Ruihua
authors.initials: R
authors.lastname: Gao
authors.forename: Lei
authors.initials: L
authors.lastname: Huang
authors.forename: Jianping
authors.initials: J
authors.lastname: Zhang
mesh_terms: D000641:Ammonia / Q000737:chemistry*; D002384:Catalysis; D002563:Cerium / Q000737:chemistry*; D003080:Cold Temperature; D017895:Manganese Compounds / Q000737:chemistry*; D008422:Materials Testing; D037742:Nanotubes, Carbon / Q000737:chemistry* / Q000648:ultrastructure*; D009569:Nitric Oxide / Q000737:chemistry*; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry*; D010316:Particle Size
chemical_list: D017895:Manganese Compounds; D037742:Nanotubes, Carbon; D010087:Oxides; D002563:Cerium; D009569:Nitric Oxide; C030583:ceric oxide; C027424:manganese oxide; D000641:Ammonia