简介:Nitrobenzene-containingindustrialwastewaterwasdegradedinthepresenceofozonecoupledwithH2O2byhighgravitytechnology.Theeffectofhighgravityfactor,H2O2concentration,pHvalue,liquidflow-rate,andreactiontimeontheefficiencyforremovalofnitrobenzenewasinvestigated.TheexperimentalresultsshowthatthehighgravitytechnologyenhancestheozoneutilizationefficiencywithO3/H2O2showingsynergisticeffect.ThedegradationefficiencyintermsoftheCODremovalrateandnitrobenzeneremovalratereached45.8%and50.4%,respectively,underthefollowingreactionconditions,viz.:ahighgravityfactorof66.54,apHvalueof9,aH2O2/O3molarratioof1:1,aliquidflowrateof140L/h,anozoneconcentrationof40mg/L,aH2O2multipledosingmodeof6mL/h,andareactiontimeof4h.Comparedwiththeperformanceofconventionalstirredaerationmixers,thehighgravitytechnologycouldincreasetheCODandnitrobenzeneremovalraterelatedwiththenitrobenzene-containingwastewaterby22.9%and23.3%,respectively.
简介:研究了Pd/Nb2O5—Al2O3催化剂的制备方法及用于丙酮加氢合成MIBK的催化性能。实验结果表明,在反应温度160℃,反应压力4MPa条件下,丙酮单程转化率为40%,MIBK选择性为92%。
简介:Effectsofhydrochlorideaciddealuminationofmordenite(MOR)catalystsforthesynthesisof1-phenyl-1-xylylethane(PXE)wereinvestigated.ThestructureandacidityofcatalystswerecharacterizedbyXRD,BET,XRF,FT-IR,27AlNMRandNH3-TPDtechniques.Thecatalyticperformanceoftheacid-treatedMORzeoliteswasstudiedthroughusingthealkylationofo-xylenewithstyrene.ThetestresultsshowedthatthestrengthofremainingBr?nstedacidsitesincreaseddespitethereductionoftotalnumberofacidsitesafterdealumination,andthemicroporesofHMORwereslightlyenlargedcoupledwiththeformationofsecondarymesopores.Additionally,themodifiedHMORzeolitesshowedlongercatalystlifewiththestyreneconversionrateretained.Amongthecatalystsemployedinthisstudy,themodifiedmordenitethatwasdealuminatedbyHCl(2mol/L)couldbeusedrepeatedlywithoutsignificantlossofactivityandselectivityduringsixcatalyticruns,whichhavebeenascribedtoitsspecificacidityandstructuralproperties.