简介：

简介：弗里多尼亚(Freedonia)集团于2016年1月16日发布预测报告,预计全球润滑油需求量到2019年将年增长2%,至4540万t,较为成熟的市场预计将保持持平,因为高端润滑油产品具有更长的换油周期,有更大的可用性,将抑制增长。该公司预计,亚太地区有最快的增幅,一些较大国家扩大的机动车数量和持续的工业化提高了需求。该公司还预计,一些发展中地区,例如中南

简介：Chromiumacetylacetonateandbis(diphenylphosphino)isopropylaminewerecoordinatedinsituandsupportedonmethylaluminoxane-modifiedsilica.Thecatalyststructureandeffectsofreactiontemperature,reactionpressureandAl/Crmolarratioonethylenetetramerizationwereinvestigatedindetail.Chromiumwasuniformlyandfirmlyimmobilizedonthesupportandcouldnotbeleachedoffbymethylaluminoxane.Thesupportedcatalyst,uponbeingactivatedwithmethylaluminoxane,exhibitedcatalyticactivityof1.70×107g/(molCr·h)forethylenetetramerizationtoform1-octeneatareactiontemperaturesof80℃,apressureof2.0MPaandanAl/Crmolarratioof300.Thesupportedcatalystpresentedagoodtolerancetohightemperature.

简介：氯丁橡胶（CR）及聚酯型热塑性弹性体（TPEE）是汽车等速万向节护套的主要类型。采用GB/T1690《硫化橡胶或热塑性橡胶耐液体试验方法》测试了环烷基基础油、石蜡基基础油及聚α-烯烃合成基础油制备的润滑脂与CR及TPEE的橡胶相容性。结果表明,不同基础油制备的润滑脂对2种橡胶的相容性有较大的区别,且随着试验时间的延长,区别变得更加明显。总体而言,聚α-烯烃合成基础油制备的润滑脂对2种橡胶的橡胶相容性最好,石蜡基基础油制备的润滑脂次之,环烷基基础油制备的润滑脂最差。将3种基础油以等比例调配制备润滑脂,可以使润滑脂产品兼具良好的低温性能和橡胶相容性。

简介：Inthisstudy,titaniumdioxidesupportedbymulti-walledcarbonnanotubes(MWCNTs/TiO2)andCr-dopedTiO2supportedbyMWCNTs(MWNTs/Cr-TiO2)weresynthesizedbythesol-gelmethod.Thepreparedsampleswerecharacterizedbytransmissionelectronmicroscopy,X-rayphotoelectronspectroscopy,X-raydiffraction,theBrunauerEmmett-Telleranalysis,andtheRamanspectroscopy.TheoxidationandefficiencyforremovalofSO2inasimulatedfluegaswereinvestigatedexperimentallyinafixed-bedreactor.The15%MWCNTs/Cr-Ti02sampledisplayedexcellentadsorptionproperties,andaSO2removalrateequatingto30.4151mg/gfromthesimulatedfluegascontaining2300μg/gofSO2,8%of02,and5%ofH20wasachievedunderoptimalconditionscoveringatemperatureof333.15K,andaspacevelocityof1275h^-1.TheadsorptionprocesswasenhancedbecauseCrdopingmodifiedtheporestructureandinhibitedthegraingrowthofTiO2.Inaddition,theFreundlichandLangmuirmodelsrevealedthatSO2wasmainlyadsorbedthroughchemicaladsorptiononthesamplesurfaces,andthethermodynamicmodelanalysisindicatedthattheadsorptionwasaspontaneous,exothermic,andentropy-reducingprocess.TheadsorptionkineticsofSO2canbedescribedbythepseudosecond-orderkineticandtheBanghamdynamicsmodels.Thepossiblereactionmechanisminvolvedindesulfurizationprocesswasalsoproposed.