稀土改性13X分子篩的表征與脫硫性能評價.pdf

《稀土改性13X分子篩的表征與脫硫性能評價.pdf》由會員上傳分享，免費在線閱讀，更多相關內(nèi)容在行業(yè)資料-天天文庫。

1、第9期化學世界·557·稀土改性13X分子篩的表征與脫硫性能評價張亞光。，葉麗萍·”，張磊，楊丙星．u，羅勇。一，王字紅(1．上海應用技術學院化學與環(huán)境_T程學院，上海201418；2．上?；ぱ芯吭?，上海200062；3．上海市聚烯烴催化技術重點實驗室，上海200062)摘要：采用離子交換法制備了Ce／13X、La／13X及La—Ce／13X分子篩吸附劑。通過X射線衍射、Nz物理吸附、掃描電子顯微鏡、傅里葉紅外光譜等手段對吸附劑進行表征，考察對比了三種吸附劑的動態(tài)吸附性能以及溫度和流速對吸附性能的影響，并對吸附劑進行再生。結果表明

2、，稀土離子改性后的13X分子篩的比表面積、孔體積出現(xiàn)一定程度的下降，分子篩結晶度降低但并未改變其骨架結構。La的載入與ce具有協(xié)同作用，使得雙金屬改性的La—Ce／13X分子篩在脫硫吸附性能上較單金屬改性的分子篩有明顯的提高。常溫下，空速為6h～，La—Ce／13X分子篩能夠將起始濃度為0．2mg／g的模擬油脫除至O．01mg／g，經(jīng)過7h后穿透，穿透硫容為6．118mg／g，吸附劑經(jīng)過氮氣氣氛300℃焙燒2h后，可較好的再生。關鍵詞：稀土金屬；吸附脫硫；l3X分子篩；噻吩中圖分類號：TQ251．2文獻標志碼：A文章編號：0367—

3、6358(2O16)09—0557—07Characterizati0nandDesulfurizationPerformanceofRare—earthModified13XMolecularSieveZHANGYa—guang～，YELi—ping’”，ZHANGLei～，YANGBing—xing?！?，LUOYong～，WANGYu—hong(j．FacultyofChemicalandEnvironmentalEngineering，ShanghaiInstituteofTechnology，Shanghai201418，C

4、hina2．ShanghaiResearchInstituteofChemicalIndustry，Shanghai200062，China；3．ShanghaiKeyLaboratoryofCatalysisTechnologyforPolyolefins，Shanghai200062，China)Abstract：TheadsorbentsofCe／13X，La／13XandLa—Ce／13Xwerepreparedbyion—exchangemethodandcharacterizedusingX—raydiffraction

5、，N2physisorption，scanningelectronmicroscopyandFouriertrans—forminfraredspectroscopy．Theadsorptionperformanceoftheadsorbentswasevaluatedonthefixedbed．Theinfluenceoftemperatureandflowrateonthedesulfurizationperformanceofadsorbentsaswellastheregenerationwasinvestigated．Co

6、mparedwiththepristine13Xzeolite，thespecificsurfacearea，porevol—umeandrelativecrystallinityofthemodifiedadsorbentsdecreasedslightly．Nevertheless，theprocessofionexchangedidnothavesignificanteffectonthestructureofzeolites．ComparedwithCe／13XandLa／13X，La—Ce／13Xexhibitedanob

7、viousimprovementindesulfurizationperformancebecauseofthesynergis—ticeffectofLaandCe．Underroomtemperatureandtheflowrateof12mL／h，La～Ce／13Xadsorbentsre—movedthesulfurto0．01mg／gfromtheinitialconcentrationof0．2mg／gandthebreakthroughcapacitywas6．118mg／gafter7h．Moreover，theLa

8、—Ce／13Xadsorbentsregeneratedbetteraftercalcinationfor2hin300℃undernitrogenatmosphere．收稿日期：2o15-09—25；修回日期：2015-1113基金