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1、[IYIO二6乏近⑧天津大謦碩士學位論文學科專業(yè):化學工程作者姓名:吳祚祥指導教師:劉炳泗教授天津大學研究生院中文摘要采用水熱合成法和離子交換法制備了cu2+、歷2+系列吸附劑,然后以燃料油催化裂化(FCC)柴油為原料,采用固定床吸附脫硫。同時用微庫侖法測定吸附脫硫前后柴油中的硫含量。常溫常壓下,用動態(tài)吸附法評價了CuMCM41吸附劑的吸附脫硫量和吸附選擇性。結果表明,每克CuMCM41處理16mL高硫柴油后達到飽和,其中吸附劑飽和脫硫量為O.25mmol。并且一次循環(huán)能將柴油中的含硫量由1600ppm降
2、到300ppm。CuMCM41吸附劑對硫化物具有很強的選擇性,用CuMCM41吸附模擬柴油,結果表明它對噻吩和苯并噻吩的吸附性比對萘強。本文迸一步研究了吸附劑脫硫性能的影響因素。首先,探討了不同載體對吸附劑性能的影響,發(fā)現(xiàn)比表面積大、孔徑大的分子篩作為吸附劑載體效果更好。其次,考察了金屬離子對吸附劑性能的影響,發(fā)現(xiàn)金屬離子半徑越小,吸附脫硫性能越好;金屬離子導致吸附劑比表面積減小及有效孔徑的降低;Cu2+的交換能力比Zn2+要強。隨后,研究了制各方法對吸附劑性能的影響,表明三種制備方法金屬離子負載率依次如
3、下:熔鹽離子交換>高壓水熱離子交換>常溫常壓水溶液離子交換。另外,研究了預處理條件對吸附劑性能的影響。,結果證實,在高溫真空條件下,可以提高吸附劑的性能。關鍵詞;高硫柴油;脫硫;吸附劑;比表面積ABSTRACTAseriesofadsorbentscontainedCupandZn2+ionswcrepreparedbyhydrothermalsynthesisandion-exchangemethods,respectively.Then,adsorptiondesulfurizationWaScarr
4、iedoutinafixed-badabsorberwithFCCdieselasaraw.Inthemeantime,thetotalsulfurcontentsindieselbeforeandafteradsorptionWaRmeasurcdusingamicrocoulombmethod.ThecapacityandselectivityofsulfuradsorptionobservedoverCu-MCM-41adsorbentWCl'eevaluatedbyadynamicexperime
5、ntatroomtemperatureandundertheatmosphericpressure.Theresultsshowedthat1gofCu-MCM-41wouldbeuptosaturationaftertreating16mlofhighsulfur-containingdieselfuel.a(chǎn)ndO.25mmolofsulfurCallberemovedalpergramofadsorbents.Meanwhile,thesulfurcontentsIndieselwerereduced
6、byacycleprocedurefrom1600to300ppm.TheCu-MCM-41adsorbenthasbeenproventobebyfarthemostso/fur-selectiveaswellaspresentthehighestsulfurcapacity.mresetsofmodeldieseladsorptionexperimentshowedthattheadsorptionofthiopheneandbenzothiopheneobservedoverCu-MCM-41ads
7、orbent.werehigherthanthatofnaphthalene.Theimpactfactorsofadsorptiondesulfurizationarestudiedinthisexperiment.Firstly,Comparedtodifferentadsorbens,MCM一41exihibitedinlargespecificsurfaceal"eaandporediameter鵲anadsorbentsupport.Secondly,Desulfurizafionefficie
8、ncyWaRinfluencedbydifferentmetalions.Thebetterdesulfurizationperformance,thesmilerradiusofpositivemetalion;inaddition,metalionloweredthesurfaceareaandporediameterofadsorbents.nleexchangecapacityofC一+WaSstrongerthant