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动态法研究乙烷在Mo-V催化剂上氧化脱氢动力学    

OXYDEHYDROGENATION KINETICS OF ETHANEON MoV CATALYST BY DYNAMIC METHOD

文献类型:期刊文献

中文题名:动态法研究乙烷在Mo-V催化剂上氧化脱氢动力学

英文题名:OXYDEHYDROGENATION KINETICS OF ETHANEON MoV CATALYST BY DYNAMIC METHOD

作者:周考文[1];张仁佑[2];刘秀英[2];王雪梅[2]

第一作者:周考文

机构:[1]北京联合大学化学工程学院;[2]北京化工大学

第一机构:北京联合大学生物化学工程学院

年份:1998

卷号:14

期号:2

起止页码:16-22

中文期刊名:石油学报(石油加工)

收录:CSTPCD;;Scopus;北大核心:【北大核心1996】;CSCD:【CSCD_E2011_2012】;

语种:中文

中文关键词:乙烯;乙烷;氧化脱氢;Mo-V催化剂;动态法;动力学

外文关键词:oxydehydrogenation of ethane to ethylene, unsupported MoO3V2O5 catalyst, adsorption,reaction mechanism, mathematical simulation

摘要:用催化动态法考察了乙烷、氧气及乙烯在无载体MoO3-V2O5催化剂上的吸脱附行为和乙烷氧化脱氢反应中各物种的应答曲线,提出了反应机理,建立了数学模型。结果表明:(1)乙烷和乙烯在催化剂上不吸附,氧在催化剂上为不可逆慢吸附;(2)乙烷与氧形成中间物及中间物分解为乙烯和水的反应均为快步骤,氧气在催化剂上的吸附可能为速率控制步骤;(3)在高温和无氧的条件下,乙烷可与催化剂中的氧(晶格氧)反应生成乙烯;(4)用Treanor法进行数值计算和DFP法进行优化,得到了机理各步速率常数的最优解,计算值与实验值能很好地吻合。
The adsorption behaviors of C2H6,C2H4 and O2 on the surface of unsupported MoO3V2O5 catalyst and the behaviors of every species in the oxydehydrogenation of ethane to ethylene were studied by Step Transient Response(STR) experiments.The oxydehydrogenation mechanism of ethane to ethylene was suggested,and the mathematical model was established.The experiment results show that:(1)C2H6 and C2H4 are not adsorbed on the surface of the catalyst,and O2 is adsorbed slowly and irreversibly;(2)Forming activate complex of ethane reacting with oxygen and its decomposition are fast,and the slow adsorption of oxygen may be the determining step of the reaction;(3)The ethane can react with the oxygen of catalyst (ie.lattice oxygen) to produce C2H4 in the absence of oxygen and at high temperature;(4)The optimum values of rate constants are obtained by TreanorDFP method.The computed values are coincided with the experimental ones.According to the relationship of Arrhenius,the activity energies and the frequency factors of every step of reaction mechanism are evaluated.Therefore,the general expressions of the rate constants are derived.

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