γ-MnO2的形貌控制及其甲苯液相氧化性能

doi:10.3866/PKU.WHXB201301041

Abstract

Abstract:

Introducing surfactants including hexadecyltrimethylammonium bromide (CTAB), macrogol 6000 (PEG6000), and poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene glycol) triblock copolymer (P123) into the refluxing aqueous crystal nucleus slurry yielded morphology-tuned microcrystalline γ-MnO₂. γ-MnO₂ and the influence of surfactant modification were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), N₂ adsorption (BET), thermogravimetry analysis (TGA), O₂ temperature programmed desorption (O₂-TPD), and temperature programmed H₂ reduction (H₂-TPR). Surfactants led to differences in γ-MnO₂ morphology, surface area, oxygen desorption behavior and reducibility. The effect of reflux time on catalyst morphology is discussed. The catalytic performance of γ-MnO₂ during the solvent-free atmospheric oxidation of toluene was evaluated. PEG6000 modified γ-MnO₂ exhibited the highest catalytic activity judging by surface area because of a greater mixed valency and more anion vacancies. The greatest mass specific activity was obtained for P123 modified γ-MnO₂ with the largest surface area. Optimized reaction conditions yielded an 18.1% toluene conversion, and 87.4 and 73.2% total selectivity and selectivity for benzoic acid, respectively.

Key words: γ-MnO₂, Selective oxidation of toluene, Morphology tuning, Oxygen species, Surfactant

MSC2000:

O643

LIN Jian, CAI Fan, ZHANG Guo-Yu, YANG Le-Fu, YANG Jin-Yu, FANG Wei-Ping. Preparation of Morphology-Tuned γ-MnO₂ and Catalytic Performance for the Liquid-Phase Oxidation of Toluene[J].Acta Phys. -Chim. Sin., 2013, 29(03): 597-604.

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Preparation of Morphology-Tuned γ-MnO₂ and Catalytic Performance for the Liquid-Phase Oxidation of Toluene

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Preparation of Morphology-Tuned γ-MnO2 and Catalytic Performance for the Liquid-Phase Oxidation of Toluene

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Preparation of Morphology-Tuned γ-MnO₂ and Catalytic Performance for the Liquid-Phase Oxidation of Toluene