超细钴纳米粒子催化1-己烯低压氢甲酰化反应的原位红外光谱研究(英文)

超细钴纳米粒子催化1-己烯低压氢甲酰化反应的原位红外光谱研究(英文)IntroductionThe low-pressure hydrogenation reaction of 1-hexene to

1- 超细钴纳米粒子催化己烯低压氢甲酰化反应的原 () 位红外光谱研究英文 Introduction Thelow-pressurehydrogenationreactionof1-hexenetoform aldehydeisanimportantreactioninthechemicalindustry.The useofcobaltnanoparticlesasacatalystinthisreactionhasbeen ofgreatinterestduetoitshighcatalyticactivity,selectivityand stability.Inthisstudy,weconductedanin-situinfrared spectroscopystudyonthecatalyticactivityofcobaltnanoparticles inthe1-hexenelow-pressurehydrogenationreaction. ExperimentalDetails Cobaltnanoparticlesweresynthesizedusingawetchemical reductionmethod.Thenanoparticleswerecharacterizedusing transmissionelectronmicroscopy,X-raydiffraction,andFourier transforminfraredspectroscopy.The1-hexenelow-pressure hydrogenationreactionwascarriedoutinabatchreactorata temperatureof333K,ahydrogenpressureof3MPa,anda catalystloadingof0.5wt%. In-situinfraredspectroscopyexperimentswereconducted usingafouriertransforminfraredspectrometer(FTIR)equipped withahigh-pressuretransmissioncell.Reactionsampleswere takenatdifferentreactiontimes,andtheirinfraredspectrawere recorded. ResultsandDiscussion Transmissionelectronmicroscopyanalysisshowedthatthe cobaltnanoparticleshadanaveragesizeof3.4nmwithanarrow sizedistribution.X-raydiffractionresultsindicatedthatthe nanoparticleswerecrystallineinnatureandhadanaverage crystallitesizeof3.5nm. Thein-situinfraredspectraofthehydrogenationreaction showedthepresenceofvariousreactionintermediates.The stretchingfrequenciesoftheC=CdoublebondsandC-Hbondsof 1-hexenedecreasedwithincreasingreactiontime.Thestretching frequenciesoftheC=Obondsofaldehydeproductsincreased withincreasingreactiontime.Theseresultssuggestedthatthe