教材Study on the deactivation and regeneration of the ZSM-5 catalyst used in methanol to olefins

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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