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时间:2019-06-02
《教材Study on the deactivation and regeneration of the ZSM-5 catalyst used in methanol to olefins》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、Availableonlineatwww.sciencedirect.tom一JOURl{AL0f酶ScienceDirectNATURALGASCHEMISTRY曩一JournalofNaturalGasChemistry20(2011)266--270www.elsevier.com/locate/jngcStudyonthedeactivationandregenerationoftheZSM一5catalystusedinmethanoltoolefinsJingchangZhangl,,HaibinZhang1,XiuyingYang2,Zho
2、ngHuang1,WeiliangCao1,2J.InstituteofModernCatalysis,StateKeyLaboratoryofChemicalResourceEngineering,BeijingUniversityofChemicalTechnology,Be(ring100029,China;2.HainanInstituteofScienceandTechnology,Haikou571126,Hainan,China;3.ShandongNewTimePharmaceuticalCo..Ltd..J讯ing272400,Shan
3、dong,China[ManuscriptreceivedDecember8,2010;revisedMarch1,2011】AbstractZSM·5zeolitecatalystmodifledbyatraceofmetalcationsshowshighactivityandhighselectivityforthereactionofmethanoltoolefins(MTO),butitinclinestodeactivateduringthereaction.Inthispaper,memechanismofthecatalystdeacti
4、vationandtheregenerationmethodwerestudiedbyX—raydiffraction(XRD),N2adsorption—desorption,infraredspectra(IR),andinfraredspectracoupledwithNHmolecularprobes(IR—NH3).Thesecharacterizationsindicatedthatcokeformationwasthemainreasonforthecatalystdeactivation.Toregeneratethedeactivate
5、dcatalyst,twomethods,i.e.,calcinationandmethanolleaching,wereused.N2adsorption—desorption,IRandIR—NHcharacteriza-tionsshowed出atbothmethodscaneliminatecokedepositedonthecatalystandmakethecatalystreactivated.XRDshowedthatthestructureofthecatalystdidnotchangeafterregeneration.1ntere
6、stingltheregeneratedcatalystevenshowedbettercatalyticperformanceoftheMTOreactionthanthefreshone.Besides,thecalcinationregenerationcaneliminatecokemorecompletely,howeve~themethanol1eachingmethodcanbemoreeasilycarriedoutinsituinthereactor.Keywordsmethanol;olefins;ZSM一5:deactivation
7、;regeneration1.Introductionmostlyfocusedonmicro·poreandmeso--porezeolitemateri·-als.ZSM一5zeoliteisaverypromisingcandidateasthecata.Lightolefins,especiallyethyleneandpropylene,areim—1ystforMTOreactionduetoitsinherentadvantages,forex—portantorganicrawmaterialsinthepetrochemicalindu
8、stry,ample。a10-ringinterconnectedchannel
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