助剂对Pd/AC催化剂催化三氟氯乙烯加氢脱氯的影响  

Effects of Promoters on Performance of Pd/AC Catalysts in Hydrodechlorination of Chlorotrifluoroethylene

作　　者：赵重阳[1] 项梦[1] 张庆[1] 韩文锋[1] 李瑛[1] 刘化章[1] 岑亚青[1] 唐浩东[1] Zhao Chongyang;Xiang Meng;Zhang Qing;Han Wenfeng;Li Ying;Liu Huazhang;Cen Yaqing;Tang Haodong(Institute of Industrial Catalysis, Zhejiang University of Technology, Hangzhou 310014, China)

机构地区：[1]浙江工业大学工业催化研究所,浙江杭州310014

出　　处：《化学反应工程与工艺》2017年第2期144-150,共7页Chemical Reaction Engineering and Technology

摘　　要：采用等体积浸渍法制备了Cu-Pd/AC和K-Pd/AC催化剂,分别考察了Cu和K助剂添加量对三氟氯乙烯加氢脱氯生成三氟乙烯的反应性能的影响,并采用N_2-物理吸附、X射线粉末衍射(XRD)测试、透射电镜(TEM)和H_2-程序升温还原(TPR)等对催化剂进行表征。结果表明:加入助剂Cu,其与Pd形成Pd-Cu合金,抑制催化剂的加氢性能,从而降低催化剂反应活性;加入助剂K,其改变了Pd的电子结构,增强了Pd的电子云密度,使Pd活化H的能力增强,从而提高催化剂的活性。助剂K质量分数为3%的催化剂,在250℃下,具有较好的催化活性,三氟氯乙烯的转化率可达90%左右,三氟乙烯的选择性可达85%左右。Cu-Pd/AC and K-Pd/AC catalysts were prepared by equivalent volume impregnation method.The effects of the addition of Cu and K promoters on the reaction performance of chlorotrifluoroethylene hydrodechlorination to trifluoroethylene were investigated.And the catalysts were characterized by N2-physical adsorption,X-ray powder diffraction(XRD),transmission electron microscopy(TEM)and H2temperature programmed reduction(H2-TPR).The results showed that the addition of Cu promoter,which formed Pd-Cu alloy inhibited the hydrogenation performance of the catalyst and reduced the reactivity of the catalyst.The addition of promoter K changed the electronic structure of Pd,enhanced the electron density of Pd and the ability of Pd to activate H,thereby improved the activity of the catalyst.The catalyst had a better activity after being added3%(mass fraction)of K promoter.The conversion of chlorotrifluoroethylene could reach about90%and the selectivity of trifluoroethylene could reach about85%at the reaction temperature of250℃.

关 键 词：三氟氯乙烯 三氟乙烯 加氢脱氯 

分 类 号：O643.38[理学—物理化学]