简介:FreshZSM-5zeolitecatalystswerepretreatedat460℃and500℃withvariouscumulativeamountofwaterfeed(CAWF)inafixedbedreactor.Thecatalyticprocesswascarriedoutunderthefollowingconditions:atemperatureof480℃;amethanolWHSVof3h-1;amethanolpartialpressureof30kPa;andatimeonstreamof12h,24hand48h,respectively.TheBETparametersofcatalystsanddiffusioncoefficientsoftolueneshowedthatthereweretwotypesofmesoporesgeneratedunderdifferenthydrothermalconditions.MildtemperatureandmoderateCAWFconditionsledtoexternalopenmesoporeswhichcouldbeenteredfromtheexternalsurfaceofthezeolite,whileahightemperatureorahighCAWFconditionresultedinthegenerationofmacroporesorinternalisolatedmesopores,whichwereoccludedinthemicroporousmatrix.TheTGAresultsshowedthatcatalystwithexternalopenmesoporeshadgoodabilitytoresistcokeaccumulationandgoodperformanceonpropyleneselectivity,whiletheinternalisolatedmesoporesdidnocontributetotheincreaseddiffusivityofreactantsandproducts.
简介:综述了近年来ZSM-5沸石分子筛的合成及表面改性研究进展.合成方面重点介绍了有机胺合成、无机胺合成及负载合成方法;表面改性方面重点介绍了水蒸气改性、离子交换改性及化学气相沉积改性方法.
简介:<正>ZSM-5/MCM-41compositemolecularsievewaspreparedbythenano-assemblingmethod.TheZSM-5molecularsieve,theMCM-41molecularsieve,theZSM-5/MCM-41mechanicalmixtureandtheZSM-5/MCM-41compositemolecularsievewerecharacterizedbyX-raypowderdiffractometry,N2adsorptionisotherms,temperatureprogrammeddesorptionofammoniaandscanningelectronmicroscopyandtheirpropertieswereanalyzed.UsingFCCgasolineasthefeed,activitiesofdifferentmolecularsievesforreducingolefincontentwereinvestigatedinacontinuoushigh-pressuremicro-reactorunitunderthefollowingconditions:areactiontemperatureof400℃,areactiontimeof2h,aweighthourlyspacevelocityof3h-1,andareactionpressureof2.0MPa.TheresultsshowedthattheHMCM-41molecularsievehadlowreactionperformance,andtheHZSM-5molecularsievedemonstratedhigharomatizationactivity,whiletheZSM-5/MCM-41compositemolecularsieveexhibitedabestolefin-reducingperformancebecauseofitshighisomerizationactivityandmoderatearomatizationactivity.Withalargestolefin-reducmgcapabilityandareasonabledistributionofproducts,thecompositemolecularsievewasmoresuitableforFCCgasolineupgradingcomparedtootherthreecatalysts.
简介:公开号CN1546236A公开日2004.11.17申请人大连理工大学本发明提供了一种用乙苯与乙烯为原料,经烷基化制对二乙苯的纳米HZSM-5沸石金属离子复合改性催化剂及其制备方法。该催化剂以纳米HZSM-5分子筛和载体Al203为母体,
简介:2004年12月3日,代表美国和日本汽车制造业的国际润滑油规格认证委员会(ILSAC)发表了一封致ILSAC/油品联席委员会丰席的信,提出开发下一代的ILSAC乘用车辆发动机油最低限度性能标准,即ILSACGF-5规格;并要求在2009年7月1日前实现这种规格发动机油的丁业化生产。从那时以来,已经起草了一份关于GF-5需求的声明(但还未正式成文),成立了几个工作小组来设计新的性能测试项目。ILSAC颁发了一份GF-5发动机油的规格草案,并且将满足GF-5规格的发动机油实现工业化的生产的期限向后推了一年,即延迟到2010年。GlennMazzamaro先生日前是总部设任美国康涅狄格州诺瓦克的R.T.Vanderbilt公司(RTV)石油部门负责与全球工业界/OEM(原装设备制造厂商)进行联络的经理,也是R.T.Vanderbilt公司派驻API润滑油专业委员会的代表,同时又是ASTM乘用车辆发动机油分级专家组的秘书。Glenn先生曾在埃克森美孚化学服务了13年,在汽巴精化服务了16年,2006年加盟RTV。本刊特约请GlennMazzamaro先生介绍ILSACGF-5发动机油规格从2005年1月到目前为止的开发过程,以及研制一种能满足GF-5规格所要求的所有发动机试验和台架试验的发动机油所面临的挑战。
简介:DuringJuneandJuly2003,JingmenPetrochemicalCompanycardedoutthecommercialtestontechnologyforhigh-temperaturecrackingofC5fractiontodecreaseolefincontentofgasolineinDCCU.ThetestresultsshowedthattheolefincontentofDCCgasolinehaddecreasedfrom68.32m%to42.5m%,meanwhilethepropyleneyieldincreasedby0.90m%.