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时间:2020-03-27
《苯并噻吩在酸改性NaY分子筛上的吸附.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43卷第1期燃料化学学报Vo1.43NO.12015年1月JournalofFuelChemistryandTechnologyJan.2O15文章编号:0253—2409(2015)01-0116-06苯并噻吩在酸改性NaY分子筛上的吸附孙慧颖,甘海军,孙林平(长春工业大学化工学院,吉林长春130012)摘要:以NaY分子筛为母体,通过柠檬酸、磷酸改性分别得到吸附剂NaY—C和NaY—P。采用SEM、XRD、XRF、N2物理吸附及NH一TPD表征可知,柠檬酸改性后得到的NaY·C吸附剂介孔表面积增加,分子筛骨架结构保持不变。同时,磷酸改性使得Na
2、Y分子筛表面弱酸量减少强酸量增加,改性后所得吸附剂NaY—P的强酸量大于NaY—C。吸附实验表明,NaY—C和NaY—P均可完全脱除模拟油品中的苯并噻吩,同时NaY—C吸附剂对0柴油的脱硫能力优于NaY—P吸附剂。再生实验中NaY—C和NaY—P吸附剂对模拟油品的脱硫率由第一次的100%分别下降至第6次的91.97%和85.96%。由此可知,柠檬酸改性NaY分子筛所得NaY—C吸附剂的脱硫能力优于NaY—P,原因是吸附剂上的介孔更易于发生吸附脱硫。关键词:NaY分子筛;苯并噻吩;柠檬酸;磷酸;吸附;再生中图分类号:0643文献标识码:AAdsorpt
3、ionofbenzothiopheneoveracidmodifiedNaYzeolitesSUNHui.ying.GANHai-jun.SUNLin—ping(SchoolofChemicalEngineering,ChangchunUniversityofTechnology,Changchun130012,China)Abstract:NaY.CandNaY—PadsorbentsweresuccessfullyobtainedthroughmodifyingparentNaYzeolitewitllcitricacidandphosphate
4、acid,respectively.Theobtainedadsorbentswerecharacterizedbyscanningelectronmicroscope,X—raydiffraction,X—rayfluorescence,N2sorptionandtemperatureprogrammeddesorptionofNH3.ThemesoporesurfaceareaoftheNaY.CadsorbentwasincreasedwhentheparentNaYzeolitewasmodifiedbycitricacid.withpres
5、ervinghezeoliteskeletalstructure.Meanwhile,thedecreasedweakacidandincreasedstrongacidcontentwereobservedinNaYzeolitemodifiedwithphosphateacidaqueoussolutionandtheamountofstrongacidsitesintheNaY.PadsorbentwasmorethanintheNaY.Cadsorbent.Theadsorptiondesulfurizationresultsshowedth
6、attheNaY.CadsorbentexhibitedmuchhigherdesulfurizationactivitythantheNaY.PadsorbentintheNo.0dieseloil,althoughallbenzothiopheneinmodeldieselwasremovedoverboth.Inregenerationexperiment.thebenzothiopheneremovalofmodeldieseloildecreasedfrom100%to91.97%and85.96%aftersixregenerations
7、overNaYCandNaY.Padsorbents.respectively.Therefore,theNaY—Cadsorbentpossessedbetterdesulfurizationperformance,possiblybecausethemesoporeoftheadsorbentisbeneficialtotheadsorptiondesulfufization.Keywords:NaYzeolites;benzothiophene;citricacid;phosphateacid;adsorption;regeneration选择
8、性吸附脱硫因具备低能耗、设备操作简单、剂再生眭能不稳定且操作步骤繁琐¨”。选择性高等优点日益受到人们关注娟J
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