碳对MCM-41转晶的影响研究  

Effect of carbon on crystal transformation of MCM-41

作　　者：郭妮亚 张晔[1] 林明桂[1] 王俊刚[1] 侯博[1] 李德宝[1,3] GUO Niya;ZHANG Ye;LIN Minggui;WANG Jungang;HOU Bo;LI Debao(State Key Laboratory of Coal Conversion,Institute of Coal Chemistry,Chinese Academy of Sciences,030001,Taiyuan,Shanxi,China;University of Chinese Academy of Sciences,100049,Beijing,China;Dalian National Laboratory for Clean*Energy 116023,Dalian,Liaoning,China)

机构地区：[1]中国科学院山西煤炭化学研究所,煤转化国家重点实验室,山西太原030001 [2]中国科学院大学,北京100049 [3]中国科学院洁净能源创新院,辽宁大连116023

出　　处：《北京师范大学学报（自然科学版）》2019年第4期462-467,共6页Journal of Beijing Normal University(Natural Science)

基　　金：中国科学院战略性先导科技专项基金资助项目(XDA21020202)

摘　　要：以介孔SiO2分子筛MCM-41为研究对象,以蔗糖为碳源,采用浸渍法制备C/MCM-41,在管式炉中氩气氛围下进行热处理,研究高温下碳对介孔SiO2转晶的影响,并通过X射线衍射(XRD)、热重(TG)、N2物理吸附脱附等对样品的物相和织构性质进行分析.结果表明,碳的存在对MCM-41的孔道可以起到支撑作用,但同时抑制了SiO2从无定形向晶型的转变,且随着碳填充量的增加,转晶温度呈升高趋势,这归因于碳的存在阻碍了Si、O原子的扩散,提高了方石成核临界尺寸的温度.Influence of carbon on phase transformation of mesoporous silica was investigated in Ar atmosphere under different temperatures from 800-1500℃.The pores of mesoporous molecular sieves in MCM-41 were filled with carbon,to obtain C/MCM-41.The physicochemical properties of this materials were characterized with X-ray diffraction(XRD),thermogravimetry(TG),and N2 physical sorption.The presence of carbon was found to play a supporting role in mesoporous structure?But silica transformation from amorphous to crystalline forms was inhibited.With increasing carbon filling,temperature of crystalline transition increased,therefore the existence of carbon hindered diffusion of Si and O atoms,making the cristobalite fail to reach a critical size of nucleation.

关 键 词：转晶 热处理 介孔分子筛 C/MCM-41 

分 类 号：TQ174[化学工程—陶瓷工业]