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Morphological effects of ordered Cr2O3 nanorods and Cr2O3 nanoparticles on fluorination of 2-chloro-1,1,1-trifluoroethane

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Abstract

Ordered Cr2O3 nanorods (Cr2O3-R) and Cr2O3 nanoparticles (Cr2O3-P) were prepared by a hard template method with SBA-15 and a deposition–precipitation method, respectively. These catalysts were tested for the fluorination of 2-chloro-1,1,1-trifluoroethane (HCFC-133a) to synthesize 1,1,1,2-tetrafluoroethane (HFC-134a). It was found that both catalysts were very selective, with a HFC-134a selectivity of 98 %. However, the Cr2O3-R catalyst had an area specific reaction rate of 0.012 μmol m−2 s−1 at 320 °C, which was much higher than that on the Cr2O3-P (0.005 μmol m−2 s−1). The enhanced activity of the Cr2O3-R was attributed to its higher content of Cr(VI) species compared to that in the Cr2O3-P, which was evidenced by the hydrogen temperature-programmed reduction and X-ray photoelectron spectroscopy results. Besides, the Cr2O3-R catalyst had a higher surface acid density (0.076 mmol m−2) than the Cr2O3-P (0.068 mmol m−2), which could be another reason for its better performance.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (No. 21373186) and Public Welfare Project of Zhejiang Province (2013C37086).

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Authors and Affiliations

  1. Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua, 321004, China

    Wen-Xia Zhang, Yan Liang, Jian-Wei Luo, Ai-Ping Jia, Yue-Juan Wang, Ji-Qing Lu & Meng-Fei Luo

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  1. Wen-Xia Zhang
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Correspondence to Meng-Fei Luo.

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Zhang, WX., Liang, Y., Luo, JW. et al. Morphological effects of ordered Cr2O3 nanorods and Cr2O3 nanoparticles on fluorination of 2-chloro-1,1,1-trifluoroethane. J Mater Sci 51, 6488–6496 (2016). https://doi.org/10.1007/s10853-016-9948-x

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