The distribution of framework aluminum atoms and extraframework exchanged cations in faujasite as studied by molecular dynamics, NMR simulation, neutron diffraction simulation and computer graphics

被引:15
作者
Himei, H [1 ]
Yamadaya, M [1 ]
Oumi, Y [1 ]
Kubo, M [1 ]
Stirling, A [1 ]
Vetrivel, R [1 ]
Broclawik, E [1 ]
Miyamoto, A [1 ]
机构
[1] TOHOKU UNIV,FAC ENGN,DEPT MOL CHEM & ENGN,AOBA KU,SENDAI,MIYAGI 98077,JAPAN
来源
MICROPOROUS MATERIALS | 1996年 / 7卷 / 05期
关键词
molecular dynamics; NMR simulation; neutron diffraction simulation; computer graphics; faujasite; aluminium distribution; cation distribution;
D O I
10.1016/S0927-6513(96)00051-X
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
The effectiveness and applicability of molecular dynamics (MD), NMR simulation, and computer graphics to the investigation of the sites and distribution of framework aluminum atoms in faujasites, which cannot be derived from experimental techniques is shown. By using MD calculations, we successfully predicted the adequate aluminum distribution in NaY zeolite (Si/A1=2.43), as it reproduces the sites and occupancies of Na+ cations which have been reported by neutron diffraction techniques. The validity of our aluminum distribution model in the NaY was strongly confirmed by the simulated Si-29 MAS NMR spectra in agreement with the experimental chemical shifts and intensities. Although the sites and occupancies of the exchanged cations in faujasites can be determined by analytical experimental techniques, their atomistic detailed distribution cannot be derived experimentally. A methodology is proposed to predict the detailed distribution of the Na+ cations in NaY by using neutron diffraction spectrum simulation.
引用
收藏
页码:235 / 242
页数:8
相关论文
共 56 条
[1]  
[Anonymous], 1994, STUDIES
[2]   THE COMPUTER MODELING OF LANTHANUM IN THE FRAMEWORK OF FAUJASITE .1. ANHYDROUS LANTHANUM ZEOLITE [J].
BRENNAN, D ;
BELL, RG ;
CATLOW, CRA ;
JACKSON, RA .
ZEOLITES, 1994, 14 (08) :650-659
[3]   THE COMPUTER MODELING OF LANTHANUM IN THE FRAMEWORK OF FAUJASITE .2. HYDRATED LANTHANUM ZEOLITE-Y [J].
BRENNAN, D ;
CATLOW, CRA ;
JACKSON, RA .
ZEOLITES, 1994, 14 (08) :660-674
[4]  
BROSSARD L, 1960, J AM CHEM SOC, V82, P1041
[5]   BEHAVIOR OF BENZENE IN SILICEOUS FAUJASITE - A COMPARATIVE-STUDY BY H-2 NMR AND MOLECULAR-DYNAMICS [J].
BULL, LM ;
HENSON, NJ ;
CHEETHAM, AK ;
NEWSAM, JM ;
HEYES, SJ .
JOURNAL OF PHYSICAL CHEMISTRY, 1993, 97 (45) :11776-11780
[6]   INDUSTRIAL APPLICATIONS OF SIMULATION STUDIES IN SOLID STATE CHEMISTRY [J].
Catlow, C. R. A. ;
Cox, P. A. ;
Jackson, R. A. ;
Parker, S. C. ;
Price, G. D. ;
Tomlinson, S. M. ;
Vetrivel, R. .
MOLECULAR SIMULATION, 1989, 3 (1-3) :49-+
[7]  
Catlow C. R. A, 1992, MODELLING STRUCTURE
[8]   STUDY OF SI AND AL ORDERING IN THE FRAMEWORK OF SILICEOUS CUBIC AND HEXAGONAL FAUJASITE ZEOLITES [J].
CHAO, KJ ;
SHY, DS ;
SHEU, SP ;
LIN, CF .
MICROPOROUS MATERIALS, 1994, 2 (02) :91-104
[9]   FLUCTUATIONS IN ZEOLITE APERTURE DIMENSIONS SIMULATED BY CRYSTAL DYNAMICS [J].
DEEM, MW ;
NEWSAM, JM ;
CREIGHTON, JA .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1992, 114 (18) :7198-7207
[10]   LOCALIZATION AND MOBILITY OF BENZENE IN SODIUM-Y ZEOLITE BY MOLECULAR-DYNAMICS CALCULATIONS [J].
DEMONTIS, P ;
YASHONATH, S ;
KLEIN, ML .
JOURNAL OF PHYSICAL CHEMISTRY, 1989, 93 (13) :5016-5019