竹质活性炭作为乙炔气相法制备醋酸乙烯催化剂载体的研究  

Study on Bamboo-Derived Activated Carbon as Catalyst Support for Vinyl Acetate Synthesis Using Acetic Acid and Acetylene

作　　者：郭秀玲[1] 陈光辉[1] 李建隆[1] GUO Xiu-ling;CHEN Guang-hui;LI Jian-long(College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China)

机构地区：[1]青岛科技大学化工学院,山东青岛266042

出　　处：《高校化学工程学报》2017年第2期420-427,共8页Journal of Chemical Engineering of Chinese Universities

基　　金：国家自然科学基金(21276132)

摘　　要：分别以磷酸法、炭化活化一步法制备的竹质活性炭为例,利用SEM、N_(2-)物理吸附等表征手段系统比较了竹质活性炭和椰壳活性炭在物化性能方面的异同,同时利用热重法考察了竹质活性炭作为催化剂载体对醋酸锌的负载量,并以气固相固定床催化反应装置为评价装置,通过乙炔气相法制备醋酸乙烯的合成反应对其催化能力进行评价。实验结果表明,磷酸法制备的竹质活性炭在比表面积、孔结构等物化性能方面都已具备作为催化剂载体的条件,同时具有较好的负载量。但由于孔的分布多为微孔,中孔和大孔的分布较少,所以催化能力相对较低;通过对竹质活性炭进行初步改性,所制备的催化剂生产能力有一定的提高,这说明竹质活性炭具备良好的改性潜力。Bamboo-derived activated carbon was prepared via phosphoric acid activation and physical activation,respectively,and their physicochemical properties were compared with that of activated carbon from coconut shell using SEM and N2-adsorption.The bamboo-derived activated carbon was used as catalyst support and its loading capacity of zinc acetate was investigated using thermo-gravimetry.Moreover,catalyst activity was evaluated by gas phase synthesis of vinyl acetate via acetylene method in a fixed bed reactor.The results show that the bamboo-derived activated carbon prepared by phosphoric acid activation is qualified as catalyst support in respect of BET surface area,pore structure and loading capacity of zinc acetate.However,it lacks transitional and macroporous pores(high percentage of microporous pores),which results in low catalytic activity.Modification of the bamboo-derived activated carbon by high temperature and ultrasonication can help improve the catalytic activity,which shows the potential of bamboo-derived activated carbon as catalyst support.

关 键 词：竹质活性炭 催化剂载体 乙炔气相法 醋酸乙烯 

分 类 号：TQ[化学工程]