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《MCM-41介微孔复合分子筛合成的影响因素.pdf》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、石油学报(石油加22)2012年2月ACTAPETROLEISINICA(PETROLEUMPROCESSINGSECTION)第28卷第1期文章编号:1001—8719(2012)01—0050—05L/MCM一41介微孑L复合分子筛合成的影响因素王春芳,陈宜假,郭士岭,张忠东,高雄厚(1.郑州大学化工与能源学院,河南郑州450001;2.中国石油天然气股份有限公司石油化工研究院,甘肃兰州730008)摘要:以十六烷基三甲基溴化铵(CTAB)为模板剂,采用两步晶化法先合成L分子筛,再合成L/MCM一41复合分子筛,合成过程中采用了离子交换技术
2、。用XRD、BET等测试手段对合成样品进行表征。考察了合成体系pH值、模板剂用量、晶化温度对合成产物的影响。结果表明,用硫酸调节合成体系pH值在1O~11范围,以及n(CTAB)/n(SiOz)一0.25、120℃晶化2d的条件下,合成得到的L/MCM一41复合分子筛孔径比微孔分子筛大,为3.04nm;与水热晶化法合成的McM41相比,壁厚由0.55nrn增大到1.81nm;水热稳定性也明显提高,在100℃沸腾状态下结构保持时间由原来的低于2h延长到8h。关键词:离子交换;复合分子筛;介一微孔复合分子筛;L/MCM一41中图分类号:TQ17,T
3、Q424.25文献标识码:Adoi:10.3969/j.issn.1001-8719.2012.01.009InfluenceFactorsofSynthesisofMeso--Micro—-PorousCompositeMolecularSieveofL/MCM-41WANGChunfang,CHENYiliang,GUOShiling,ZHANGZhongdong。,GAOXionghou。(1.SchoolofChemicalEngineering,ZhengzhouUniversity,Zhengzhou450001,China;2.P
4、etrochemicalResearchInstitute,CNPC,Lanzhou730008,China)Abstract:Meso—micro—porousL/MCM一41compositemolecularsievewassynthesizedbytWO—stepcrystallization.ThefirststepwastopreparezeoliteLandthesecondstepwastosynthesizeL/MCM~41compositemolecularsievewithcetyltrimethylammoniumbro
5、mide(CTAB)astemplateandthetechnologyofionexchange.TheproductswerecharacterizedbyX—raydiffraction(XRD)andBET.Theeffectsofthesynthesisconditions,includingpHvalue,(CTAB)/n(SiO2)andcrystallizingtemperaturewerestudied.Itwasindicatedthattheoptimalconditionsofsynthesiswereasfollows
6、:pHvaluerangeof10~11,(CTAB)/n(SiO2)一0.25,crystal1izationtemperatureof12O℃,andcrvstallizationtimeof2d,underwhichtheporediameteroftheobtainedL/MCM一41compositemolecularsievewas3.04nm,biggerthanthatofmicro—porousmolecularsieves.ComparedwithMCM一41synthesizedbyordinaryhydrothermal
7、method,theporewallthicknessoftheobtainedL/MCM一41compositemolecularsievewasraisedfrom0.55nmto1.81nm,andthehydrothermalstabilitywasbetter,thatwas,themeso—porousstructurecouldkeepunchangedfor8hat100℃,insteadof2h.Keywords:ionexchange;compositemolecularsieve;meso—micro—porouscomp
8、ositemolecularsieve:L/MCM一41收稿日期:2010一l2—23基金项目:中国石油天然气股份有限公司沸石型高性能半再生重整催化剂
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