期刊
JOURNAL OF MATERIALS SCIENCE
卷 51, 期 13, 页码 6488-6496出版社
SPRINGER
DOI: 10.1007/s10853-016-9948-x
关键词
-
资金
- National Natural Science Foundation of China [21373186]
- Public Welfare Project of Zhejiang Province [2013C37086]
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 mu mol m(-2) s(-1) at 320 A degrees C, which was much higher than that on the Cr2O3-P (0.005 mu mol 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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