射频等离子体辅助制备S_(2)O_(8)^(2-)/CeO_(2)固体超强酸催化剂的研究  

Preparation of S_(2)O_(8)^(2-)/CeO_(2)solid superacid catalyst assisted by radio frequency plasma

作　　者：王凯强 张旭东 许德鑫 黄邦斗 朱长辉 田保河 李秀兰 朱文超 WANG Kai-qiang;ZHANG Xu-dong;XU De-xin;HUANG Bang-dou;ZHU Chang-hui;TIAN Bao-he;LI Xiu-lan;ZHU Wen-chao(School of Mechanical Engineering,Sichuan University of Science and Engineering,Yibin 643000,China;State Key Laboratory of NBC Protection for Civilian,Beijing 102205,China;Beijing International S&T Cooperation Base for Plasma Science and Energy Transformation,Institute of Electrical Engineering,Chinese Academy of Sciences,Beijing 100190,China)

机构地区：[1]四川轻化工大学机械工程学院,四川宜宾643000 [2]国民核生化灾害防护国家重点实验室,北京102205 [3]中国科学院电工研究所等离子体科学和能源转化北京市国际科技合作基地,北京100190

出　　处：《现代化工》2023年第9期189-193,199,共6页Modern Chemical Industry

摘　　要：以商用CeO_(2)为载体,采用过量浸渍法浸渍(NH_(4))_(2)S_(2)O_(8)溶液,用射频等离子体以辉光放电形式辅助制备了S_(2)O_(8)^(2-)/CeO_(2)-RF固体超强酸催化剂。利用XRD、SEM、BET、FT-IR、Py-IR等对催化剂的孔结构、键结合方式、微观形貌、酸量及酸性质等进行了表征。通过色氨酸与甲醇的酯化反应评价了S_(2)O_(8)^(2-)/CeO_(2)-RF固体超强酸催化剂的活性。结果表明,与传统600℃焙烧法相比,射频辉光放电等离子体辅助制备的催化剂比表面积大、颗粒分散、酸量高、反应速率快。在反应温度为150℃、反应压力为1 MPa的条件下,S_(2)O_(8)^(2-)/CeO_(2)-RF催化剂上色氨酸甲酯的产率为82%,并且在1.5 h后反应趋近平衡。Taking commercial CeO_(2)as support,S_(2)O_(8)^(2-)/CeO_(2)-RF solid superacid catalyst is prepared via excessively impregnating(NH_(4))_(2)S_(2)O_(8)solution assisted with radio frequency plasma in the form of glow discharge.XRD,SEM,BET,FT-IR and Py-IR are employed to characterize the pore structure,bond bonding mode,micro morphology,acid content and acid property of the catalysts.The activity of S_(2)O_(8)^(2-)/CeO_(2)-RF solid superacid catalyst is evaluated in esterification of tryptophan and methanol.It is shown that the catalyst prepared under the assistance of radio frequency glow discharge plasma has larger specific surface area,more dispersive particles,higher acid content and faster reaction rate than the catalyst prepared by traditional calcination method at 600℃.The yield of methyl tryptophane reaches 82%over S_(2)O_(8)^(2-)/CeO_(2)-RF catalyst at 150℃and 1 MPa,and the reaction approaches equilibrium after 1.5 h.

关 键 词：射频等离子体 固体超强酸催化剂 氧化铈 酯化反应 色氨酸甲酯 

分 类 号：O69[理学—化学]