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时间:2020-03-23
《NaA沸石的合成及热稳定性研究.pdf》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、第38卷第6期非金属矿Vb1.38No.62015年11月Non.MetallicMinesNovember,2015NaA沸石的合成及热稳定性研究胡小强彭同江孙红娟李联(1西南科技大学材料科学与工程学院,NJil绵阳621010;2西南科技大学矿物材料及应用研究所,四川绵阳621010;3西南科技大学分析测试中心,四川绵阳621010)摘要在常压开放水体系中合成了NaA沸石,探讨了Na20与SiO摩尔比、晶化温度和晶化时间对合成NaA沸石纯度的影响,阐述了合成过程中产生杂晶NaX沸石和羟基方钠石的原因,并考察了不同煅烧温度对NaA沸石热稳定性的影响。结果表明:体系中合成N
2、aA沸石的最佳优化条件为:NazO与SiO,摩尔比为2.0,晶化温度为80℃,晶化时间为l0h,其中Na20与SiO2摩尔比对产物的骨架类型和纯度影响较晶化温度和时间大。热分析结果表明,NaA沸石经850℃热处理仍能保持骨架结构的稳定,热稳定性较强;在900℃时骨架结构被破坏,相变为霞石。关键词NaA沸石;合成;煅烧温度;热稳定性中图分类号:TQ424.25文献标识码:A文章编号:1000-8098(2015)06-0001-04SynthesisofZeoliteNaAandItsThermalStabiHtyHuXiaoqiangPengTongjiarlg2SunHo
3、ngjBan3LiLian(1InstituteofMaterialsScienceandEngineering,SouthwestUniversityofScienceandTechnology,Mianyang,Sichuan621010;2InstituteofMineralMaterials&Application,SouthwestUniversityofScienceandTechnology,Mianyan,Sichuan621010;3AnalyticalandTestingCenter,SouthwestUniversityofScienceandTech
4、nology,Mianyang,Sichuan621010)AbstractThezeoliteNaAsamplewerepreparedinopenwatersystematatmosphericpressure.TheefectofmolarratioofNa20toSiO2,crystallizationtemperatureandcrystallizationtimeonthedegreeofpurityofzeoliteNaAwereexplo~ed,andthereasonsoftheformationofimpurecrystalzeoliteNaXandhy
5、droxysodalitewereelaborated.Inaddition,theefectofdiferentcalcinationtemperatureonthermalstabilityofzeoliteNaAwasinvestigated.TheresultsshowedthattheoptimumconditionsofsyntheticzeoliteNaAwerethatthemolarratioofNa20toSi02was2.0,crystallizationtemperaturewas80℃,crystallizationtimewas10h.Themo
6、larratioofNa20toSiO2hadagreaterinfluencethancrystallizationtemperatureandcrystallizationtimefortheskeletontypeanddegreeofpurityoftheproducts.ThezeoliteNaX,zeoliteNaAandhydroxysodalitehadasimilarskeletonstructureandstructuralenergy,whichwerethereasonsoftheformationofimpurecrystalzeoliteNaXa
7、ndhydroxysodaliteduringthesyntheticprocessofzeoliteNaA.ThethermalanalysisresultshowedthatthezeoliteNaAcouldmaintaintheintegrityofskeletontypeandhadgoodthermalstabilityat850℃.PhasetransitionfromzeoliteNaAtonephelinewasoccurredat900℃.KeywordszeoliteNaA;synthesis
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