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Effect of Calcination Temperature on La-Modified Al2O3 Catalysts for Vapor Phase Hydrofluorination of Acetylene to Vinyl Fluoride
Qing-yuan Bi,Ji-qing Lu,Li-qiong Xing,Ming Guo,Meng-fei Luo*
Author NameAffiliationE-mail
Qing-yuan Bi Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004, China  
Ji-qing Lu Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004, China  
Li-qiong Xing Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004, China  
Ming Guo Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004, China  
Meng-fei Luo* Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004, China mengfeiluo@zjnu.cn 
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.
Key words:  La2O3-Al2O3 catalyst, Hydrofluorination reaction, Vinyl fluoride, Acetylene,Calcination temperature
FundProject:
Effect of Calcination Temperature on La-Modified Al2O3 Catalysts for Vapor Phase Hydrofluorination of Acetylene to Vinyl Fluoride
毕庆员,鲁继青,邢丽琼,郭明,罗孟飞*
摘要:
利用沉积沉淀法制备出了La改性Al2O3催化剂,研究不同焙烧温度对La改性Al2O3催化剂用于乙炔气相氢氟化合成氟乙烯反应性能的影响.利用NH3-TPD、Pyridine-FTIR、XRD和Raman等技术对不同温度焙烧的催化剂进行表征,发现焙烧过程能改变催化剂结构的同时也能调变催化剂表面的酸量.经400 °C焙烧的催化剂显示出最高的乙炔转化率(94.6%)、最高的氟乙烯选择性(83.4%)和较低的积炭选择性(0.72%).催化剂的高活性与其表面的高酸量有关,同时积炭的选择性也与其表面的酸中心数量有关.
关键词:  La2O3-Al2O3催化剂,氢氟化反应,氟乙烯,乙炔,焙烧温度
DOI:10.1088/1674-0068/23/01/89-94
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