《Pd-Laγ-Al2O3气相催化合成3,5-二甲基苯胺》.pdf.pdf

2008年1月第16卷第1期工业催化 INDUSrRlAL CA7I’ALYSIS 瓣撇毒艘绷 Pd—La/V—A1203气相催化合成3;5一二甲基苯胺何邦方,孙璐璐,吕利敏,王佳,刘纯山’. (华东理工大学工业催化研究所,上海200237) 摘要:以7一A1:03为载体,采用浸渍法制备了Pd—l_a/'/一舢20,催化剂,并在固定床反应器中研究了该催化剂上的气相胺化合成3,5一二甲基苯胺。采用BET孔结构测试、XRD、TG和SEM等手段对新鲜及失活催化剂进行表征,考察了胺化反应前后催化剂性能的变化。结果表明,失活催化剂上的积炭分别沉积在金属和载体上。关键词:催化化学;Pd—La/1/一m203催化剂;3,5一:-V基苯酚;气相胺化;3,5一二甲基苯胺;积炭失活中图分类号: 文献标识码:A 文章编号:(2008)01-0045-03 Synthesis of3,5-dimethylaniline viagas-phase amination over +Pd-La/v-A12 03catalyst HE Banffang,SUNMu,￡驴Limin,WANG肋,HU Chunshan。(Institute ofIndustrial Catalysis,East China University ofScience andTechnology, Shanghai 200237,China) Abstract:A Pd-La/T—A12 03catalyst was prepared byimpregnation method using^y·A1203 asthesupport. Synthesis of3,5-dimethylaniline viagas-phase amination was investigated in acontinuous fixedbed reac— tor over freshanddeactivatedcatalystsamples were characterized by BET,XRD,TG- DTG resultsshowed thatcoke formation occurred on boththemetal and thesupport. Key words:catalytic chemistry;Pd-La/T·A12 03 catalyst;3,5-dimethylphenol;gas·phase amination; 3,5-dimethylaniline;coke formation CLC number: Document code:A ArticleID:1008—1143(2008)01-0045-03 3,5一二甲基苯胺是重要的化工原料和中间体, 在染料、颜料、医药、农药和橡胶助剂的生产中均有应用?,与3,4,9,。传统工艺以2,4一二甲基苯胺为原料【2】,通过酰化、硝化、水解、重氮化和还原等过程制得。该工艺流程长,收率低,成本高,工业化生产存在一定困难。张秀成等口1对3,5一二甲基苯酚气相胺化