Source163

cn163.net  时间:2021-02-07  阅读:()
SynthesisofASingle-PhaseSuperfineNa-YZeolitefromCoalFlyAsh*ZOULixiaa,DINGHuilingb,ZHENGLanpingb,HEMejuana,XUQiongaaStateKeyLaboratoryBreedingBaseofNuclearResourcesandEnvironment,EastChinaInstituteofTechnology,Nanchang,330013,Jiangxi,ChinabJiangxiscienceandtechnologynormaluniversity,Nanchang,Jiangxi,330000,Chinaaemail:lxzou1125@163.
comKeywords:superfine,zeolite-Y(FAZ),flyash(FA),crystallization,synthesisAbstract.
Theprocessforthesynthesisofflyash-basedsuperfinezeolites-Y(FAZ)werepresented,whichbasicallyincludedthealkalinefusiontreatmentofflyash(FA),thegelsformationbydissolvedandaged,followinghydrothermalcrystallization.
Adetailedinvestigationwascarriedouttodeterminetheeffectsofconditionsofsynthesissuperfinezeolite-Y.
Thecrystallizationstructureofzeolite-YwascharacterizedbyX-raydiffraction(XRD)andscanningelectronmicroscope(SEM).
Theexperimentalresultsshowthattheoptimizedconditions:Flyashbyalkalifusion(NaOH:flyashratio1.
2:1),anddissolvedof60Cusingdistilledwaterandagedof25Cfor22h.
Thefollowing,atconditionsof2.
2MNaOHsolution,liquid:solid=6.
5,theslurrywashydrothermalcrystallizedat100Cfor24h.
Synthesisofparticlesexhibitscompletelygrowncrystalsofzeolites-Yandcubicmorphologywithapproximatedimensionsof400mm.
Thecrystalinityofzeolite-Ywas88.
7%.
AttheadvantageofthispaperwastosynthesizesuperfineYzeolitethatusingonlyflyashasarawmateriaandwithoutusinganyothersiliconandaluminumsourceandanytemplateadditionundermildconditions.
IntroductionCoalashisgeneratedbycombustionofcoalinapowerstationasawasteproduct.
IthasbeenestablishedthatFAismainlycomposedofamorphousmaterial(aluminosilicateglasses)canbeconvertedtozeolitesinalkalisolutionsbyhydrothermaltreatment.
TherearemanyreportsforsynthesisofzeolitefromFA,forexample,faujasite,Na-Azeolite,phillipsiteandhydroxysodalite.
Thezeolite-Yhasbeusedinreceivedmuchattention.
Itisalsoreportedthatuseofzeolite-Ycanimprovecatalyticcrackingselectivity,reducecokeformation,increasetheyieldofdieseloilandpromotegasolinequality;itcanalsobeusedinthefinechemicalindustry.
Inthesynthesesofzeolite-Y,silicasourcesuchassodiumsilicatesolutionandSourceofaluminumarecurrentlyusedandthisrequirestheadditionofseedsorinitialsolutiontoprovidenuclei[1~4].
Theaimofthispaperwastosynthesizeasingle-phasesuperfinezeolite-YfromFA.
Andanysourceofsiliconandaluminumsourceandanyorganictemplatewithoutadditional.
TheproductsthusobtainedwerecharacterizedbyXRDandSEM.
Theformationconditionandprocessofasingle-phasezeolite-Yarediscussedinthisarticle.
ExperimentZeolitesynthesisAhomogenousmixturewaspreparedbypropergrindingandmixingofflyashandcausticsodain1:1.
2ratio.
Thismixturewasheatedatabout750Cforabout2h.
Then,thefusionsamplewascooled,milledandmixedthoroughlyusingdistilledwaterinabreaker.
Thebreakerwaskeptinawaterbathandstirredconstantlyforafewhours.
Theslurrywassubjectedtoultrasonicandagingforafewhours.
Thisamorphousalumino-silicategelwasformed.
Thisgelwasthensubjectedtocrystallizationbetween40C~100Cforabout10~30hinspeciallydesignedstainlessalloyautoclaveswiththinwallswhichallowafastheattransfer.
Thesolidcrystallineproductwasrecoveredbyfiltrationandwashedwithdistilled-deionizedwaterthoroughlyuntilthefiltratepHwas11,anddriedat80°Cfor24hinanairoven.
Characterization.
Thematerialsobtainedwerecharacterizedbyvariousconventionalmethods.
PowderX-raydiffraction(XRD)patternsweretakenonaRigakuX-raydiffractometerusingNi-filteredCuKRradiation(30kV,16mA).
ParticlemorphologywasobservedbyanHitachiscanningelectronmicroscope(SEM).
ResultsandDiscussionInfluenceofmolarratiosSiO2/Al2O3Fig.
1.
InfluenceofFig.
2Influenceofagingtemperatures:FAzeolite-YmolarratioSiO2/Al2O3:(1)80C,(2)50Cand(3)40Cfor24h;Fig.
4SEMspectrumofzeolite-Y(a)0.
9,(b)2.
0,(c)pureFA(4)at60Cfor2hand25Cfor22hFigure1showstheXRDpatternsofthesynthesizedsampleswereinvestigatedbychangingotherSiO2/Al2O3ratiofrom0.
9to3.
5andthecrystallizationtemperatureat100C.
ThepatternsofthematerialformedatSiO2/Al2O3=0.
9possessesmanydiffractionpeaks,whichcanbeassignabletozeolite-A.
WhentheratioofSiO2/Al2O3increase,newpeaksoffaujasiteappear(pattern(b)-(c)).
ThesyntheticfaujasitetypezeolitetakesintwoformswiththesamecrystalstructureatdifferentSiO2/Al2O3molarratio.
Onewaszeolite-XwithSiO2/Al2O3=2.
0andanotherwaszeolite-Yusingonlythestartingmaterialsflyash(SiO2andAl2O3ratioof2.
5~3.
5about).
InfluenceofagingconditionsIthasbeenestablishedthattheamorphousaluminosilicateinFAiseasiertodissolvethanthecrystallineonesuchasR-quartzandmulliteinalkalisolutions.
Toclarifythedetailedformationprocessofzeolite-Y,effectonthefinalproductofcrystallizationwerecharacterizedunderdifferentagingconditions.
InFigure2,ascanbeseen,thezeolite-Ywassynthesised,butthecrystallizationstrengthreductionwithtemperaturerise.
Thisisbecausethesiliconaluminumdissolvedeasilyformationgelunderhightemperature,depositedonthesurfaceofFA,furtherinfluenceinwhichthesiliconaluminumdissolved,resultdcrystallizationdecreased.
TheintensityofXRDpeakofthesample-(4)washighestwhichthatitwasdissolvedof60Candagedof25Cfor22h.
So,itwasusedasafixedagingconditioninthefollowingsynthesisexperiments.
InfluenceoftheconditionsofcrystallizationFig.
3(1)illustratestheXRDpatternsofthreesamplessynthesizedfromFAattheconditionof1M,2.
2Mand3MNaOHsolutionandcrystallizationfor24h.
AccordingtoXRDpatternsofthreesamplesobtained,onlysample(2.
2MNaOHsolution)wasconfirmedbypure-formzeolite-Ywithouttheformationofothertypesofzeolites.
HuiandChaopointedoutthatsynthesisofzeoliteYdependsontherateofgeldissolution[5],thenumberanddistributionofnucleiinpreparedinitialgel,andthecrystalgrowthrateduringhydrothermaltreatment.
ThestructuralformationofzeoliteYmaybeexplainedinturndependonotherfactorssuchassynthesistemperature,crystallizationtime,compositionmolarratiosofinitialgel,etc.
Fig.
3XRDpatternsofFAYindifferentatcontidionsof1)alkalinityconcentration,2)crystallizationtime,3)crystallizationtemperatures,4)theratioofliquidtosolidThealumino-silicatefusedmassgelobtainedisamorphousandchangestothecrystallinestatewhensubjectedtohydrothermalcrystallization.
TheresultspresentedinFig.
3(2,3)revealsthatcrystallizationtemperatureandtimeinfluenceszeoliticcrystallinity.
Percentcrystallinityofzeolite-Yincreasessignificantlyuntilupto100Cfor24h.
Thecrystallizationtimeincreasesto30h,theotherpeakstoformed.
Therefore,crystallizationcontidionsidentifiedas100Cfor24hintheexperiment.
Fig.
3(4)showstheXRDpatternsofsamplesproducedusingdifferentmolarratiosofliquidtosolidunderthesamesyntheticconditions.
TheXRDpatternsindicatethatallsamplesexhibitazeolite-Ystructure.
Notably,thesamples-2(liquid:solid=6.
5)showsignificantlyhigherbroadeneddiffractionpeaks,withhigheryieldofcrystallization.
Therelativecrystalinitiescalculated[6]forsamples-1(liquid:solid=8.
5)andsamples-2arefoundtobe74.
7%and88.
7%,respectively.
MorphologicalstudiesTheSEMphotographsinFig.
3depictthesampletransformationofFAintoZeolite-Y.
Sampleszeolite-Yarefairlyuniformincrystalsize,andtheindividualaggregatesarecomposedofcloselypackednanocrystals,andhavesmalleraverageaggregatesizes.
Thisisprobablybecauselessuniformcrystallizationoccurredingel.
Forthesampletheaverageparticle(aggregate)sizewasestimatedfromatleast400nmparticlesintheSEMimages.
ConclusionsSynthesisofFAZisdirectlyrelatedtoextractionofsilicatesandaluminatesformFAusingsodiumhydroxide.
Fromtheinformationpresentedinthispaper,Si4+andAl3+ionsareelutedfromfusingFAbydissolutionofamorphousmaterialduringtheagingandcrystallizationtoformasingle-phaseYtypezeoliteintheautoclave.
TheYtypezeolitewerecharacterizationbyXRDandSEMpatterns,thefollowingconclusionscanbedrawn.
AhomogenousfusionmixturewaspreparedbypropergrindingandmixingofFAandcausticsodain1:1.
2ratio.
Thismixturewascalcinedatabout750Cforabout2h.
Thensamplewasdissolvedat60Candagedat25Cfor22h,tobegelformation.
Thegelandwaterastheratioofliquidtosolidis6.
5,in2.
2MNaOHsolutiontocrystallizationfor24hat100Cusingtheautoclave.
Themaximumpurityofzeolite-Ywasobtained,crystalinitycalculatedforsampleswas88.
7%.
SO,theSiO2andAl2O3ratioof2.
5~3.
5inFAfavoursformationofZeolite-Y.
OnmodificationoftheactualSiO2andAl2O3ratio,byincreasingsodiumsilicateorsodiumaluminatecontent,itwaspossibletosynthesisezeolite-Xorzeolite-AatSiO2/Al2O3of2.
0or0.
9respectively.
Theimportantfeatureofthisnovelprocedureistoproducesuperfinezeolite-Yandcrystalinity88.
7%inonevesselwithoutusinganyothersiliconandaluminumsourceandanytemplateaddition.
ThehighvolumeutilizationofFAforzeoliteproductiontechnologycomparedtoothermediumrlowvalueutilization,thisproductiontechnologyhasadvantagesofvalueaddition,offeringanedgeoverotherflyashutilisationtechnologiescurrentlyused.
AcknowledgmentThisstudywassupportedinpartbyJiangxiProvincialDepartmentofscienceandtechnologysupportprograminchina(20122BBG70084-2).
ThehelpandcooperationrenderedbythemanagementofFengchengThermalPowerStationincollectingflyashforthisresearchworkisgreatlyacknowledged.
References[1]RayaluS,MeshramSU,HasanMZ.
Highlycrystallinefaujasiticzeolitesfromflyash.
JournalofHazardousMaterials,B,Vol.
77(2000),P.
123–131[2]JulianaCI,DeniseAF,FernandoSS,ect.
.
CharacteristicsofBraziliancoalflyashesandtheirsynthesizedzeolitesOriginalResearch.
Article.
FuelProcessingTechnology,Vol.
97(2012),P.
38-44[3]BelvisoC,CavalcanteF,JavierHuertasF,ect.
.
Thecrystallisationofzeolite(X-andA-type)fromflyashat25°CinartificialseawaterOriginalResearchArticle.
MicroporousandMesoporousMaterials,Vol.
162(2012),P.
115-121[4]KazemianH,NaghdaliZ,GhaffariKashaniT,ect.
.
ConversionofhighsiliconflyashtoNa-P1zeolite:AlkalinefusionfollowedbyhydrothermalcrystallizationOriginalResearchArticle.
AdvancedPowderTechnology,Vol.
21(2010),P.
279-283[5]ClaudiaB,FrancescoC,SaverioF.
SynthesisofzeolitefromItaliancoalflyash:DifferencesincrystallizationtemperatureusingseawaterinsteadofdistilledwaterOriginalResearchArticle.
WasteManagement,Vol.
30(2010),P.
839-847[6]HuiKS,ChaoCYH.
Effectsofstep-changeofsynthesistemperatureonsynthesisofzeolite4Afromcoalflyash,Micropor.
Mesopor.
Mater.
Vol.
88(2006),P.
145–151[7]FotovatF,KazemianH,KazemeiniM.
SynthesisofNa-Aandfaujasiticzeolitesfromhighsiliconflyash.
MaterialsResearchBulletin.
MaterialsResearchBulletin,Vol.
44(2009),P.
913–917

10gbiz七月活动首月半价$2.36/月: 香港/洛杉矶CN2 GIA VPS

10gbiz怎么样?10gbiz 美国万兆带宽供应商,主打美国直连大带宽,真实硬防。除美国外还提供线路非常优质的香港、日本等数据中心可供选择,全部机房均支持增加独立硬防。洛杉矶特色线路去程三网直连(电信、联通、移动)回程CN2 GIA优化,全天低延迟。中国大陆访问质量优秀,最多可增加至600G硬防。香港七星级网络,去程回程均为电信CN2 GIA+联通+移动,大陆访问相较其他香港GIA线路平均速度更...

无忧云-河南洛阳BGP,CEPH集群分布式存储,数据安全可靠,活动期间月付大优惠!

 无忧云怎么样?无忧云服务器好不好?无忧云值不值得购买?无忧云是一家成立于2017年的老牌商家旗下的服务器销售品牌,现由深圳市云上无忧网络科技有限公司运营,是正规持证IDC/ISP/IRCS商家,主要销售国内、中国香港、国外服务器产品,线路有腾讯云国外线路、自营香港CN2线路等,都是中国大陆直连线路,非常适合免备案建站业务需求和各种负载较高的项目,同时国内服务器也有多个BGP以及高防节点...

天上云:香港大带宽物理机服务器572元;20Mbps带宽!三网CN2线路

天上云服务器怎么样?天上云是国人商家,成都天上云网络科技有限公司,专注于香港、美国海外云服务器的产品,有多年的运维维护经验。世界这么大 靠谱最重,我们7*24H为您提供服务,贴心售后服务,安心、省事儿、稳定、靠谱。目前,天上云香港大带宽物理机服务器572元;20Mbps带宽!三网CN2线路,香港沙田数据中心!点击进入:天上云官方网站地址香港沙田数据中心!线路说明 :去程中国电信CN2 +中国联通+...

cn163.net为你推荐
deduplicationchrome微信群里正在组织赌博127.0.0.1127.0.0.1打不开tcpip上的netbios禁用tcp/ip上的netbios对网络应用软件的正常运行有没有影响?win7关闭135端口如何用命令关闭135端口viewerfusioncharts科技有限公司cn163Areasff海氧之家有谁知道海氧之家的制氧原理?家用制氧机前十排名家用制氧机十大排名最靠前的是哪个?
免费网站空间申请 北京域名注册 备案未注册域名 香港vps99idc pccw 云鼎网络 个人域名 百兆独享 hostloc 云营销系统 服务器维护 智能dns解析 秒杀品 广东主机托管 mteam 机柜尺寸 so域名 gotoassist cc加速器 远程主机强迫关闭了一个现有的连接 更多