Infrared spectroscopic studies on cations in zeolite pores using CH4 as a probe molecule

被引:6
作者
Yamazaki, T
Hasegawa, K
Honma, K
Ozawa, S
机构
[1] Ishinomaki Senshu Univ, Sch Sci & Engn, Dept Basic Sci, Ishinomaki 9868580, Japan
[2] Tohoku Univ, Grad Sch Engn, Dept Appl Chem, Aoba Ku, Sendai, Miyagi 9808579, Japan
[3] Akita Univ, Fac Engn & Resource Sci, Akita 0108502, Japan
关键词
D O I
10.1039/b100609f
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
To clarify the nature of cation sites, such as the strength of the electric field exerted by them, their location, etc., in zeolite pores, adsorption of methane on a series of ion (Li, Na, K and Rb) exchanged zeolites (FAU, FER and MOR) with different Si/Al ratios was discussed based on IR spectroscopy and adsorption thermodynamics. The interaction energy of methane with the zeolites was strongly correlated with the micropore size of the main channel rather than the cation content in the zeolites. On the contrary, the strength of the electric field in the vicinity of Na sites increased with the increase in the Si/Al ratio of the zeolite in spite of the decrease in the amount of cations. All of the cations incorporated in the zeolites studied were not always available for methane adsorption since cations in the zeolites are distributed into deep (methane inaccessible) sites and surface (methane accessible) sites, and the amount of inaccessible sites often increased with the decrease in the size of the cation.
引用
收藏
页码:2686 / 2691
页数:6
相关论文
共 38 条
[1]  
Barthomeuf D., 1980, STUD SURF SCI CATAL, V5, P55, DOI [10.1016/S0167-2991(08)64865-X, DOI 10.1016/S0167-2991(08)64865-X]
[2]   ANHARMONIC POTENTIAL FUNCTIONS AS DERIVED FROM RAMAN INTENSITIES - METHANE [J].
BERMEJO, D ;
MONTERO, S .
JOURNAL OF CHEMICAL PHYSICS, 1984, 81 (09) :3835-3841
[3]   ZINC-EXCHANGED Y-ZEOLITES STUDIED WITH CARBON-MONOXIDE AND XENON AS PROBES [J].
BODDENBERG, B ;
SEIDEL, A .
JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS, 1994, 90 (09) :1345-1350
[4]   COMPARATIVE IR-SPECTROSCOPIC STUDY OF LOW-TEMPERATURE H2 AND CO ADSORPTION ON NA ZEOLITES [J].
BORDIGA, S ;
GARRONE, E ;
LAMBERTI, C ;
ZECCHINA, A ;
AREAN, CO ;
KAZANSKY, VB ;
KUSTOV, LM .
JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS, 1994, 90 (21) :3367-3372
[5]   FOURIER-TRANSFORM INFRARED STUDY OF CO ADSORBED AT 77-K ON H-MORDENITE AND ALKALI-METAL-EXCHANGED MORDENITES [J].
BORDIGA, S ;
LAMBERTI, C ;
GEOBALDO, F ;
ZECCHINA, A ;
PALOMINO, GT ;
AREAN, CO .
LANGMUIR, 1995, 11 (02) :527-533
[6]   Vibrational spectroscopy of H2, N2, CO and NO adsorbed on H, Li, Na, K-exchanged ferrierite [J].
Bordiga, S ;
Palomino, GT ;
Pazè, C ;
Zecchina, A .
MICROPOROUS AND MESOPOROUS MATERIALS, 2000, 34 (01) :67-80
[7]   SORPTION STATES OF ISOELECTRONIC LINEAR-MOLECULES IN ZEOLITES [J].
BOSE, H ;
FORSTER, H .
JOURNAL OF MOLECULAR STRUCTURE, 1990, 218 :393-398
[8]  
*CAT SOC JPN, 1985, SHOK KOZ, P172
[9]   EFFECT OF AN ELECTRIC-FIELD ON A METHANE MOLECULE .1. INFRARED-ANALYSIS OF METHANE (CH4-CD4) ADSORBED IN NAA ZEOLITE IN THE TEMPERATURE-RANGE 150-20-K [J].
DELARA, EC ;
KAHN, R ;
SELOUDOUX, R .
JOURNAL OF CHEMICAL PHYSICS, 1985, 83 (06) :2646-2652