采用溶胶-凝胶法制备并分析了掺杂铈、钕、铕、铒的MCM-41介孔材料,运用XRD、HRTEM、EDS和BET等方法考察了镧系金属元素掺杂对MCM-41结构的影响.研究结果表明,镧系金属元素掺杂到了MCM-41试样的骨架结构中.由于材料结构中的一部分Si4+被Ln3+所取代,介孔材料的有序孔道d值随着掺杂镧系离子半径的减小而降低,随着镧系元素掺杂量的增加而上升.
MCM-41 mesoporous materials doped with Cerium, Neodymium, Europium and Erbium were synthesized by
hydrothermal methods. Powder X-ray diffraction (XRD), N2 sorption and high resolution transmission electron microscopy-X-ray energy dispersive
spectroscopy techniques (HRTEM-EDX) were used to investigate the effects of Lanthanides to the structure of MCM-41. Results show that Lanthanides
have been incorporated into the framework and/or walls of the silica matrix. The ordering of the mesoporous structure is dependent
on the doping content and ionic diameters of Lanthanides. An increase in the content of Ln leads to the increase in the average pore diameter and
a decrease in the diameter of Ln leads to the decrease in the average pore diameter.
参考文献
| [1] | |
| [2] | Yao H C, Yu Yao. J. Catal., 1984, 86: 254--265. [2] 卢冠忠, 汪仁. 催化学报, 1991, 12: 83--89. [3] Krege C T, Leonowicz M E, Roth W J, et al. Nature, 1992, 359: 710--712. [4] Beck J S, Vartuli J S, Roth W J, et al. J. Am. Chem. Soc., 1992, 114: 10843--10843. [5] Corma A, Fornes V, Carcia H, et al. J. Am. Chem. Soc., 1994, 116: 9767. [6] Leon R, Margolese D, Stukey G D, et al. Phys. Rev., 1995, 52: R2285. [7] Wu C G, Bein T. Science, 1994, 264: 1757--1759. [8] Beck J S, Kuehl G H, Olson D K, et al. US Patent, 1994, 5: 348--687. [9] Abe T, Tachibana Y, Takeshi Y, et al. Chem. Commun., 1995. 1617. [10] Tanev P T, Chibwe M, Pinnavania T J. Nature, 1994, 368: 321--324. [11] Wei D, Wang H, Feng X, et al. J. Phys. Chem. B, 1999, 103: 2113--2121. [12] Corma A. Chem. Rev., 1997, 97: 2373--2419. [13] He N-Y, Bao S-L, Xu Q-H. Stud. Surf. Sci. Catal., 1997, 105: 85. [14] Kuang Y, He N-Y. Colloid Surf. A: physicochem. Eng. Asp., 2001, 179: 177--184. [15] Araujo A S, Jaroniec M, Stud. J. Colloid Interface Sci., 1999, 218, 462--467. [16] Laha S C, Mukherjee P, Sainkar S R, et al. J. Catal., 2002, 207: 213--223. [17] Matos J R, Mercuri L P, Jaroniec M, et al. J. Mater. Chem., 2001, 11: 2580--2586. [18] Wang L Z, Shi J L, Yu J, et al. Nanostructure Materials, 1998, 10: 1289--1299. [19] Sing K S W, Evrett D H, Haul R A W, et al. Pure & |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%