| 气相氟化合成1,1,1,2-四氟乙烷的CrOx-Y2O3催化剂的表征与性能 |
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| 引用本文： | 钱林,邢丽琼,毕庆员,李洪芳,陈科峰,张学良,鲁继青,罗孟飞.气相氟化合成1,1,1,2-四氟乙烷的CrOx-Y2O3催化剂的表征与性能[J].物理化学学报,2009,25(2):336-340. |
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| 作者姓名： | 钱林 邢丽琼 毕庆员 李洪芳 陈科峰 张学良 鲁继青 罗孟飞 |
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| 作者单位： | Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004, Zhejiang Province, P. R. China; Zhejiang Qu Hua Fluor-Chemistry Company Limited, Quzhou 324004, Zhejiang Province, P. R. China |
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| 摘 要： | 制备了一系列CrOx-Y2O3催化剂用于气相氟化1,1,1-三氟-2-氯乙烷(HCFC-133a)合成1,1,1,2-四氟乙烷(HFC-134a), 并考察了Y(OH)3、YCl3和Y(NO3)3前躯体对催化剂性能的影响. XRD和UV-Vis光谱实验结果表明, Y前躯体对催化剂表面Cr物种有影响, 其中采用Y(OH)3前躯体的催化剂有利于以高分散的Cr6+形式存在. 研究表明CrOx-Y2O3催化剂在预处理和反应过程中, 部分高价CrOx可转化为CrF3. 催化剂中CrF3含量增加, 导致其转化为活性物种的含量相对减少, 所以其催化活性下降.
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| 关 键 词： | 1 1 1 2-四氟乙烷 氟化 CrOx-Y2O3催化剂 CrOx物种 |
| 收稿时间： | 2008-10-30 |
| 修稿时间： | 2008-12-02 |
Characterization and Performance of CrOx-Y2O3 Catalysts for the Synthesis of 1,1,1,2-Tetrafluoroethane |
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| QIAN Lin,XING Li-Qiong,BI Qing-Yuan,LI Hong-Fang,CHEN Ke-Feng,ZHANG Xue-Liang,LU Ji-Qing,LUO Meng-Fei.Characterization and Performance of CrOx-Y2O3 Catalysts for the Synthesis of 1,1,1,2-Tetrafluoroethane[J].Acta Physico-Chimica Sinica,2009,25(2):336-340. |
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| Authors: | QIAN Lin XING Li-Qiong BI Qing-Yuan LI Hong-Fang CHEN Ke-Feng ZHANG Xue-Liang LU Ji-Qing LUO Meng-Fei |
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| Institution: | Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004, Zhejiang Province, P. R. China; Zhejiang Qu Hua Fluor-Chemistry Company Limited, Quzhou 324004, Zhejiang Province, P. R. China |
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| Abstract: | The synthesis of 1,1,1,2-tetrafluoroethane from 2-chloro-1,1,1-trifluoroethane was performed over CrOx-Y2O3 catalysts prepared by a co-precipitation method. The effect of yttrium precursor on the CrOx species was investigated. The catalysts were prepared using hydroxide, chloride, and nitrate yttrium precursors and were denoted as CrYO-H, CrYO-Cl, and CrYO-N, respectively. After the pre-fluorination these catalycts were denoted as CrYF-H, CrYF-Cl, and CrYF-N, respectively. Catalytic activity decreased in the following order: CrYF-H>CrYF-Cl>CrYF-N. The highest activity obtained for the CrYF-H catalyst could be attributed to the highest content of Cr(VI) on the catalyst surface. This species then transformed into an active species such as CrOxFy or Cr(OH)xFy during the activation process. The presence of CrF3, which originated fromthe Cr(VI), resulted in decreased activity. |
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| Keywords: | 1 1 1 2-Tetrafluoroethane Fluorination CrOx-Y2O3 catalyst Chromiumoxide species |
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