Tuning the K+ Concentration in the Tunnel of OMS-2 Nanorods Leads to a Significant Enhancement of the Catalytic Activity for Benzene Oxidation

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• 作者：Jingtao Hou ; Liangliang Liu ; Yuanzhi Li ; Mingyang Mao ; Haiqin Lv ; Xiujian Zhao
• 刊名：Environmental Science & Technology
• 出版年：2013
• 出版时间：December 3, 2013
• 年：2013
• 卷：47
• 期：23
• 页码：13730-13736
• 全文大小：416K
• 年卷期：v.47,no.23(December 3, 2013)
• ISSN：1520-5851

文摘

OMS-2 nanorods with tunable K⁺ concentration were prepared by a facile hydrothermal redox reaction of MnSO₄, (NH₄)₂S₂O₈, and (NH₄)₂SO₄ at 120 掳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 (螖T₅₀ = 89 掳C; 螖T₉₀ > 160 掳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.