CF4 decomposition over solid ternary mixture NaF-Si-MO(MO=La2O3,CeO2,Pr6O-(11),Nd2O3,Y2O3) |
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基金项目: | supported by the National Natural Science Foundation of China (No. 20976149) |
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摘 要: | A solid ternary mixture consisting of NaF,silicon and one metal oxide such as La2O3,CeO2,Pr6O11,Nd2O3,and Y2O3 was prepared and usedas de-fluorinated reagent for CF4 decomposition.The results show that 90% conversion of CF4 can be reached initially over NaF-Si-La2O3,NaF-Si-CeO2,NaF-Si-Nd2O3,and NaF-Si-Y2O3 at 850 C.The fresh and used reagents were characterized using XRD and XPS techniques.It was found that the active components of NaF and metal oxides in NaF-Si-CeO2,NaF-Si-Pr6O11,NaF-Si-Nd2O3,and NaF-Si-Y2O3 weretransformed into inert phases of mixed metal fluorides and silicates,respectively,resulting in an ineffective utilization of these de-fluorinatedreagents,whereas no inert phases from NaF and La2O3 can be observed in the used NaF-Si-La2O3,indicating the NaF-Si-La2O3 reagent couldbe utilized more efficiently than the other reagents in CF4 decomposition.
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关 键 词: | CF4 decomposition solid ternary mixture NaF-Si-MO(MO = La2O3 CeO2 Pr6O11 Nd2O3 Y2O3) de-fluorinated reagent reactivity |
收稿时间: | 17 October 2011 |
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