http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Fluorination of dichlorodifluoromethane to synthesize tetrafluoromethane over Cr_2O_3–AlF_3 catalyst
Wenzhi Jia,Mengfei Luo,Lingyun Jin,Yuejuan Wang,Jiqing Lu 한국공업화학회 2011 Journal of Industrial and Engineering Chemistry Vol.17 No.3
A series of Cr_2O_3–AlF_3 catalysts with different Cr_2O_3 contents were prepared by a deposition–precipitation method for the fluorination of dichlorodifluoromethane (CCl_2F_2) to synthesize tetrafluoromethane (CF4). The highest activity was obtained on the Cr_2O_3–AlF_3 catalyst containing 61.2 wt.% of Cr_2O_3, with the CF_4 yield of 94% at 400℃. X-ray diffraction (XRD) and Raman spectroscopy results indicated the presence of bulk Cr_2O_3 and a-AlF_3 phases in the catalysts. Ammonia temperature programmed desorption (NH3-TPD) and Fourier transformation infrared spectroscopy (FTIR) of pyridine chemisorption revealed strong Lewis acidity of the catalysts. The Cr species and Lewis acid in the Cr_2O_3–AlF_3 catalysts were the active sites of fluorination and dismutation reaction of CCl_2F_2, respectively. This indicated bi-function catalytic performance of Cr_2O_3–AlF_3 catalysts for fluorination and dismutation reaction.