Citation: 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 Physico-Chimica Sinica, ;2013, 29(03): 597-604. doi: 10.3866/PKU.WHXB201301041 shu

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

1.
College of Chemistry and Chemical Engineering, National Engineering Laboratory for Green Chemical Productions of Alcohols, Ether, Esters, Xiamen University, Xiamen 361005, P. R. China

Received Date: 20 September 2012
Available Online: 4 January 2013
Fund Project: 国家重点基础研究发展规划项目(973) (2010CB226903)资助 (973) (2010CB226903)

Introducing surfactants including hexadecyltrimethylammonium bromide (CTAB), macro l 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.
- γ-MnO₂,
- Selective oxidation of toluene,
- Morphology tuning,
- Oxygen species,
- Surfactant
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沈阳化工大学材料科学与工程学院沈阳 110142

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

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通讯作者: 陈斌, bchen63@163.com

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