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
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
HostYun 新增美国三网CN2 GIA VPS主机 采用美国原生IP低至月15元
在之前几个月中也有陆续提到两次HostYun主机商，这个商家前身是我们可能有些网友熟悉的主机分享团队的，后来改名称的。目前这个品牌主营低价便宜VPS主机，这次有可以看到推出廉价版本的美国CN2 GIA VPS主机，月费地址15元，适合有需要入门级且需要便宜的用户。第一、廉价版美国CN2 GIA VPS主机方案我们可看到这个类型的VPS目前三网都走CN2 GIA网络，而且是原生IP。根据信息可能后续...
Vultr再次发布充值多少送多少活动
昨天我们很多小伙伴们应该都有看到，包括有隔壁的一些博主们都有发布Vultr商家新的新用户注册福利活动。以前是有赠送100美元有效期30天的，这次改成有效期14天。早年才开始的时候有效期是60天的，这个是商家行为，主要还是吸引到我们后续的充值使用，毕竟他们的体验金赠送，在同类商家中算是比较大方的。昨天活动内容：重新调整Vultr新注册用户赠送100美元奖励金有效期14天今天早上群里的朋友告诉我，两年...
Megalayer优化带宽和VPS主机主机方案策略 15M CN2优化带宽和30M全向带宽
Megalayer 商家主营业务是以独立服务器和站群服务器的，后来也陆续的有新增香港、菲律宾数据中心的VPS主机产品。由于其线路的丰富，还是深受一些用户喜欢的，有CN2优化直连线路，有全向国际线路，以及针对欧美的国际线路。这次有看到商家也有新增美国机房的VPS主机，也有包括15M带宽CN2优化带宽以及30M带宽的全向线路。Megalayer 商家提供的美国机房VPS产品，提供的配置方案也是比较多，...
cn163.net为你推荐
-
电子行业动态跟踪报告圆周刊社区责任编辑:支持ipadboxiphonexp如何关闭445端口Windows XP 怎么关闭445端口，我是电脑小白，求各位讲详细点xp如何关闭445端口系统怎么关闭445端口xp如何关闭445端口请大家帮帮忙，怎样关闭135和445端口？css3圆角css实现圆角的几种方法是什么？127.0.0.1为什么输入127.0.0.1无法打开页面fusioncharts如何自定义FusionCharts图表上的工具提示？