简介：ThetargetproductswerepreparedbyhomogeneousprecipitationmethodusingSDSandPEG800,respectively,assurfactantatareactiontemperatureof95℃for3h,followedbycalcinationat400℃for3h.ThesampleswerecharacterizedandanalyzedbyXRD,SEM,FTIRandzetapotentialmeasurements.Theproductsweremodifiedwithdifferentsurfactantstoimprovetheirdispersionstability,boththeamountandthebestzetapotentialvaluesofwhichwereidentifiedinthiswork.Thesurface-modifiednano-particleswereaddedatamassfractionof1.0%,2.0%,3.0%,and4.0%,respectively,intothebaseoil.Itwasshowedthattheadditiveinbaseoilhasgoodoilsolubilitywithoutdetectablecorrosionofcopperstripe,andhadexcellentbehaviorintermsofanti-wearperformanceandlowerfrictioncoefficient.

简介：ThemesoporousAl-SBA-15zeolitewasobtainedviaimpregnationofpuresilica-basedSBA-15zeolitewithaluminumnitrate.TheAl-SBA-15samplewascalcinedinairat800℃for6handhydrothermallytreatedatnear100℃for120h,respectively,andthenthethermalandhydrothermalstabilityofAl-SBA-15samplewasinvestigatedbyX-raydiffractometry(XRD),scanningelectronmicroscopy(SEM),transmissionelectronmicroscopy(TEM)andnitrogenadsorptionanddesorptiontechniques.TheAl-SBA-15samplewasalsostudiedby27Alnuclearmagneticresonance(27AlNMR)andammoniatemperatureprogrammeddesorption(NH3-TPD)techniques.Inaddition,thecatalyticactivityofAl-SBA-15zeolitewasinvestigatedbytheFriedel-Craftsreactionsof2,4-di-tert-butylphenolwithcinnamylalcohol.ThetestresultsshowedthatthethermalandhydrothermalstabilityofAl-SBA-15zeolitewasbetterthanthatofSBA-15zeo-lite.TheAl-SBA-15zeolitesamplepreparedbyimpregnationmethodexhibitsmoreframeworkaluminumspeciesandAl-O-Siunits.Therefore,thenumberofthesurfacehydroxylgroupswasreduced,resultinginthestabilizationofframeworkstructureofAl-SBA-15zeolite.Thealuminumspeciescanformweakandmedium-strongacidsiteswithcatalyticactivity.