jordan shoes Al2（SO4）3／SiO2

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Al2（SO4）3／SiO2催化甲醇脱水合成二甲醚
21～137DehydrationofMethanoltoDimethylEtheroverAI2(SO4)3／SiO2CatalystsYANGHai—xia，SUNQing，FUYu—chuan，SHENJian-yi(SchoolofChemistryandChemicalEngineering，NanjingUniversity，Nanjing210093,[link widoczny dla zalogowanych]，China)Abstract：TheAI2(SO4)3／SiO2catalystswerepreparedviaanincipientwetnessimpregnationmethod．Thephysi—calandchemicalproperties，inespecialthesurfaceacidityofthecatalystswerecharacterizedbythetechniquesofBET，XRD，n1-IR，isopropanolprobereaction,[link widoczny dla zalogowanych]，microcalorimetryandfvr—IRforNH3adsorption．Thecatalyticac—tivitiesofthecatalystswereevaluatedinthereactionofmethanoldehydrationtodimethylether．TheresultsfromBET,[link widoczny dla zalogowanych]，XRDandFI"-IRverifiedthatthespecificsurfaceareasofthesupportedcatalystsdecreasedwiththeincrease0fA12(SO4)3loading．Above20％A12(SO4)3loading，crystallineA12(SO4)3wasdetectedforthesupportedsam—pies．ItcouldbeconcludedfromtheresultsofmicrocalorimetryandFF—IRforNH3adsorption，that，upontheload—ingofA12(SO4)3，thesupportedcatalystsexhibitedmuchhighersurfaceaciditythantheSiO2support,[link widoczny dla zalogowanych]，onwhichthesurfaceaciditywasfirstenhancedandthenweakenedwiththecontinuousincreaseofA12(SO4)3loading．Inad—dition，bothBronsted(B)andLewis(L)acidsitesexistonthesurfaceofthesupportedsampleswithBacidsitespredominantly．Thecatalystwith3％AI2(SO4)3loadingexhibitedthestrongestsurfaceacidityandthuspossessedthehighestcatalyticactivityinmethanoldehydration．At533K．83．5％conversionofmethanolwith100％selec—tivitytodimethyletherwasachievedonthe3A12(SO4)3／SiO2catalyst．Keywords：A12(SO4)3／SiO2；Dehydrationofmethanol；Synthesisofdimethylether；Surfaceacidity
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