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《丁酸甲酯高温分解的过渡态理论研究-论文.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、辽宁大学学报JOURNALoFUAoNlNGUNlVERSI1Y自然科学版NaturalSciencesEtion第41卷第3期2014年Vo1.41NO.32014丁酸甲酯高温分解的过渡态理论研究宋朋,胡瑞,赵金峰(辽宁大学物理学院,辽宁沈阳110036)摘要:选取了丁酸甲酯高温分解的十三个反应路径中较为重要的两个反应:CH,OCO=CH,+CO(R)和CHOCO=CH0+CO(R).使用密度泛函理论方法在B3LYP/TZVP基组水平上寻找了反应的过渡态,并且得到了两个反应的势能曲线.R的势垒高度远远低于R2,同时R。的产物CH。
2、和CO拥有较低的能量,处于相对稳定的状态.因此,反应CHOCO=CH,+CO更容易发生.结论为丁酸甲酯的动力学模型研究提供了一定的理论依据.关键词:丁酸甲酯;密度泛函理论方法;过渡态中图分类号:O643.12文献标志码:A文章编号:1000-5846(2014)03-0216-06TransitionStateTheoryStudyonMethylButanoateDecompositionReactionSONGPeng,HURui,ZHAOJin-feng(SchoolofPhysics,LiaoningUniversity,S
3、henyang110036,China)Abstract:Inthispaper,twoimportantreactionspathwaysofCH3OCO=CH3+CO2(R1)andCH3OCO=CH3O+CO(R2)inmethylbutanoatepyrolysisreactionwerestudiedbyusingdensityfunctionaltheorymethods.Basedonthecalculatedtransitionstateanditsreactionenergy,theenergeticprofile
4、softhesetworeactionswereobtained.Asaresult,thebarrierheightofR1ismuchlowerthanR2,andtheproductofRlhaveverylowenergy,whichleadtoastablestate.Therefore,CH3andCO2aremorelikelytobeformed.OurstudyreviewsthatCH3OCO=CH3+CO2(R1)isthemainreactionoftheMBdecomposition,andprovides
5、supportsforstudyingthedetailedkineticmechanismforMB.Keywords:methylbutanoate;densityfunctionaltheory;transitionstate1IntroductionNowadaysusingrenewablefuelasareplacementforreducingourconsumptionofcrude·oil·-derived收稿日期:2014—03—02作者简介:宋朋(1978一),汉族,沈阳人,副教授,主要从事激发态动力学研究,E
6、mail:songpeng@lnu.edu.cn第3期宋朋,等:丁酸甲酯高温分解的过渡态理论研究217dieselfuels,ismorenecessaryfortheenergyconcernandtherisingcarbondioxidesemission⋯.Bio—diesels,whichderivedfromanimalfatsandvegetableoils,containthemethylestersoffattyacidsoftheR一(C=O)一O—Rformwithabout16~18carbonatoms.I
7、thasbeenshownthatbio.diese1fuelscanbeusedinnearlyalldieselenginesandproducelessCOandunburnedhydrocarbonsL2j.Duetothechemicalcomplexity,theselong—chainmethylesters,aregenerallydifficulttostudyinthelaboratory.Methylbutanoate(MB),CH3CH2CH2C(O)OCH3,hasbeenwidelyusedasasurr
8、ogateforlong.chainbio-fuelmethylestermoleculesinmanyresearchesbecauseofcontainingtheessentialchemicalstructureofthelo
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