title: Tuning the K+ concentration in the tunnel of OMS-2 nanorods leads to a significant enhancement of the catalytic activity for benzene oxidation.
abstract: OMS-2 nanorods with tunable K(+) concentration were prepared by a facile hydrothermal redox reaction of MnSO4, (NH4)2S2O8, and (NH4)2SO4 at 120 °C by adding KNO3 at different KNO3/MnSO4 molar ratios. The OMS-2 nanorod catalysts are characterized by X-ray diffraction, transmission electron microscopy, N2 adsorption and desorption, inductively coupled plasma, and X-ray photoelectron spectrometry. The effect of K(+) concentration on the lattice oxygen activity of OMS-2 is theoretically and experimentally studied by density functional theory calculations and CO temperature-programmed reduction. The results show that increasing the K(+) concentration leads to a considerable enhancement of the lattice oxygen activity in OMS-2 nanorods. An enormous decrease (ΔT50 = 89 °C; ΔT90 > 160 °C) in reaction temperatures T50 and T90 (corresponding to 50 and 90% benzene conversion, respectively) for benzene oxidation has been achieved by increasing the K(+) concentration in the K(+)-doped OMS-2 nanorods due to the considerable enhancement of the lattice oxygen activity.
authors.affiliation: State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology , 122 Luoshi Road, Wuhan 430070, P. R. China.
authors.forename: Jingtao
authors.initials: J
authors.lastname: Hou
authors.forename: Liangliang
authors.initials: L
authors.lastname: Liu
authors.forename: Yuanzhi
authors.initials: Y
authors.lastname: Li
authors.forename: Mingyang
authors.initials: M
authors.lastname: Mao
authors.forename: Haiqin
authors.initials: H
authors.lastname: Lv
authors.forename: Xiujian
authors.initials: X
authors.lastname: Zhao
mesh_terms: D000327:Adsorption; D001554:Benzene / Q000737:chemistry*; D002248:Carbon Monoxide / Q000737:chemistry; D002384:Catalysis; D008958:Models, Molecular; D043942:Nanotubes / Q000737:chemistry* / Q000648:ultrastructure; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry; D056951:Photoelectron Spectroscopy; D011188:Potassium / Q000032:analysis*; D011789:Quantum Theory; D013696:Temperature; D014961:X-Ray Diffraction
chemical_list: D002248:Carbon Monoxide; D001554:Benzene; D011188:Potassium; D010100:Oxygen