甲烷气氛下模型化合物热解的初步研究  

Preliminary Research on the Thermal Cracking of Model Compounds Under Methane Atmosphere

作　　者：申峻[1] 熊奇[1] 武瑞涛[2] 刘刚[1] 牛艳霞[1] 

机构地区：[1]太原理工大学化学化工学院,太原030024 [2]河北师范大学化学与材料科学学院,石家庄050024

出　　处：《燃烧科学与技术》2015年第1期47-53,共7页Journal of Combustion Science and Technology

基　　金：国家自然科学基金资助项目(21076137);山西省回国留学人员基金资助项目(2012-037);山西省高校优秀青年学术带头人基金资助项目(TYAL2011)

摘　　要：以3％Ni／SAPO．34为催化剂，研究了二苯甲烷、二苯乙烷、苄基苯基醚在氮气或甲烷气氛下的热解反应，反应温度为380—480℃，初始压力为5～7MPa，反应时间为1～2h．结果表明，催化剂能选择性地促进模型化合物中C（芳）一C（烷）及CH2一CH2键的断裂，对脱氢反应有一定的抑制作用，并且能促进活性氢向裂解的自由基转移，使自由基加氢；甲烷气氛下模型化合物的热解效果要优于氮气气氛；温度是热解的主要影响因素；不同模型化合物热解稳定性顺序不同，二苯甲烷较难裂解，二苯乙烷次之，苄基苯基醚最易裂解．同时也探讨了十氢萘、四氢萘、萘和1-甲基萘对二苯乙烷热解的影响，发现加入供氢溶剂后转化率降低，溶剂对氢解裂化反应具有抑制作用，四氢萘的抑制作用较强，其他供氢溶剂抑制作用较弱．Pyrolysis of diphenylmethane （DPM） , 1, 2-diphenylethane （DPE） and benzylphenylether （BPE） was studied in the presence of nitrogen or methane, with 3%Ni/SAPO-34 as catalyst, at various reaction tempera- ture （380---480 ℃）, pressure （5--7 MPa） and reaction time （1--2 h）. The results show that the catalyst can accelerate the decomposition of aryl--alkyl and CH2--CH2 bonds, inhibit dehydrogenation, and promote the transfer of active hydrogen to the hydrocracking active sites of model compounds and than hydrogenate them. The pyrolysis under methane is superior to that of nitrogen, and temperature plays a key role in the pyrolysis. The stability of three model compounds is different, DPM is most difficult to decompose, followed by BPE, while DPE is easiest to decom- pose. The effect of decalin, tetralin, naphthalene and 1-methylnaphthalene on the decomposition of DPE was also studied. The conversion rate of DPE decreases when solvents are added, and hydrogen donor solvents may inhibit the hydrocracking of DPE. Tetralin exerts the strongest inhibiting effect, while the other solvents exert weak inhibiting effects.

关 键 词：甲烷 模型化合物 热解 供氢溶剂 

分 类 号：TQ531[化学工程—煤化学工程]