以介孔分子筛SBA-15为考察对象,蔗糖为碳源,浓硫酸为碳化剂,制备了C/SBA-15复合材料.在氩气氛下进行热处理,考察了在碳存在的情况下,热处理温度对SBA-15物相、组成和结构的影响规律.采用X射线衍射分析(XRD)、N2吸附-脱附等温线、扫描电镜(SEM)等测试手段对产物的晶相、化学组成和形貌进行分析.结果表明,经800～1200℃高温处理,SBA-15主要以无定型氧化硅存在,有序介孔孔道均有部分保持,同时,随着热处理温度升高,SBA-15孔道的有序度降低,比表面、孔容和孔径逐渐减小.当温度升高到1300℃时,碳不仅起到支撑孔道的作用,也作为反应物与氧化硅反应生成碳化硅.而没有碳支撑的SBA-15在1000℃介孔结构完全消失,在1200℃即开始生成方石英相,1300℃完全转为方石英.碳在SBA-15热处理的过程中不仅起到对介孔结构的支撑作用,且能抑制无定形二氧化硅向晶体方石英的转变.
参考文献
| [1] | 王连洲;施剑林;禹剑;严东生.介孔氧化硅材料的研究进展[J].无机材料学报,1999(3):333-342. |
| [2] | 韩宇;肖丰收.由沸石纳米粒子自组装制备具有高催化活性中心和水热稳定的新型介孔分子筛材料[J].催化学报,2003(2):149-158. |
| [3] | 孙锦玉;赵东元."面包圈"状高有序度大孔径介孔分子筛SBA-15的合成[J].高等学校化学学报,2000(1):21-23. |
| [4] | 诸荣;陈航榕;施剑林;严东生.以嵌段共聚物为结构导向剂的SBA-15和SBA-16的合成及表征[J].无机材料学报,2003(4):855-860. |
| [5] | Runduo Zhang;Dongjun Shi;Ning Liu.Mesoporous SBA-15 promoted by 3d-transition and noble metals for catalytic combustion of acetonitrile[J].Applied Catalysis, B. Environmental: An International Journal Devoted to Catalytic Science and Its Applications,2014:79-93. |
| [6] | Jun S.;Ryoo R.;Kruk M.;Jaroniec M.;Liu Z.;Ohsuna T. Terasaki O.;Joo SH..Synthesis of new, nanoporous carbon with hexagonally ordered mesostructure[J].Journal of the American Chemical Society,200043(43):10712-10713. |
| [7] | Hu Zhou;Jiandong Zhuang;Qiang Yan;Qian Liu.Facile preparation and high microwave absorption of C/SiO_2 composites with an ordered inter-filled string mesostructure[J].Materials Letters,2012:117-119. |
| [8] | Shuai Meng;Dong-Hua Wang;Guo-Qiang Jin;Ying-Yong Wang;Xiang-Yun Guo.Preparation of SiC nanoparticles from plastic wastes[J].Materials Letters,201024(24):2731-2734. |
| [9] | Silva PC.;Figueiredo JL..Production of SiC and Si3N4 whiskers in C+SiO2 solid mixtures[J].Materials Chemistry and Physics,20013(3):326-331. |
| [10] | Sakthivel Tamil Selvan;Salem S. Aldeyab;S. M. Javaid Zaidi;Dakshinamoorthy Arivuoli;Katsuhiko Ariga;Toshiyuki Mori;Ajayan Vinu.Morphological Control of Porous SiC Templated by As-Synthesized Form of Mesoporous Silica[J].Journal of nanoscience and nanotechnology,20118(8):6823-6829. |
| [11] | Pengpeng Lv;Hailei Zhao;Jing Wang;Xin Liu;Tianhou Zhang;Qing Xia.Facile preparation and electrochemical properties of amorphous SiO_2/C composite as anode material for lithium ion batteries[J].Journal of Power Sources,2013Sep.1(Sep.1):291-294. |
| [12] | Shunsuke Asahina;Julien Schmitt;Tomas Kjellman.Direct Observation of Plugs and Intrawall Pores in SBA-15 Using Low Voltage High Resolution Scanning Electron Microscopy and the Influence of Solvent Properties on Plug-Formation[J].Chemistry of Materials: A Publication of the American Chemistry Society,201320(20):4105-4112. |
| [13] | L. D. Zhang;G. W. Meng;F. Phillipp.Synthesis and characterization of nanowires and nanocables[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,20001(1):34-38. |
| [14] | S. Cetinkaya;S. Eroglu.Chemical vapor deposition of C on SiO_2 and subsequent carbothermal reduction for the synthesis of nanocrystalline SiC particles/whiskers[J].International Journal of Refractory Metals & Hard Materials,20115(5):566-572. |
| [15] | Li Guiyan;Ouyang Haibo;Huang Jianfeng;Zeng Xierong;Cao Liyun;Fei Jie;Xiong Xinbo.Synthesis and visible-light photocatalytic activity of SiC/SiO_2 nanochain heterojunctions[J].Materials Letters,2014May.1(May.1):125-128. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%