Effect of Calcination Temperature on La-Modified Al2O3 Catalysts for Vapor Phase Hydrofluorination of Acetylene to Vinyl Fluoride
- Received Date: 2009-10-13
- La2O3-Al2O3 catalyst, Hydrofluorination reaction, Vinyl fluoride, Acetylene,Calcination temperature
Abstract: A La-modified Al2O3 catalyst was prepared with deposition-precipitation method. The effect of calcination temperature on the reactivity for vapor phase hydrofluorination of acetylene to vinyl fluoride. The catalysts calcined at different temperatures were characterized using NH3-TPD, pyridine-FTIR, X-ray diffraction, and Raman techniques. It was found that the calcination process could not only change the structure of these catalysts but also modify the amount of surface acidity on the catalysts. The catalyst calcined at 400 oC exhibited the highest conversion of acetylene (94.6%) and highest selectivity to vinyl fluoride (83.4%) and lower coke deposition selectivity (0.72%). The highest activity was related to the largest amount of surface acidity on the catalyst, and the coke deposition was also related to the total amount of surface acidic sites.
|Citation:||Qing-yuan Bi, Ji-qing Lu, Li-qiong Xing, Ming Guo, Meng-fei Luo. Effect of Calcination Temperature on La-Modified Al2O3 Catalysts for Vapor Phase Hydrofluorination of Acetylene to Vinyl Fluoride[J]. Chinese Journal of Chemical Physics , 2010, 23(1): 89-94. doi: 10.1088/1674-0068/23/01/89-94|