2002 Fiscal Year Final Research Report Summary
On Chloro-fluoro-Carbons adsorbed on Zeolite by the NMR Measurements
| Project/Area Number |
12650774
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
触媒・化学プロセス
|
|---|
| Research Institution | Saitama University |
|---|
Principal Investigator |
YOSHIDA Toshihisa Saitama University, Dept. Education, Professor, 教育学部, 教授 (90016395)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
IWAMOTO Issei Saitama University, Dept. Engineering, Professor, 工学部, 教授 (90008871)
TOKITA Sumio Saitama University, Dept. Engineering, Professor, 工学部, 教授 (20008866)
ISHIWATA Mitumasa Saitama University, Dept. Science, Professor, 理学部, 教授 (80184571)
ASHIDA Minoru Saitama University, Dept. Education, Professor, 教育学部, 教授 (30125166)
|
|---|
| Project Period (FY) |
2000 – 2002
|
| Keywords | Adsorption / Zeolite / Flon gas / NMR Chemical-Shift / Relaxation Time by NMR / Motional Correlation Time / Adsorptive Structure / Adsorbing Time Span |
|---|
| Research Abstract |
In order to know the adsorptive behaviors of flon gases (CFC22 ; CHClF_2 and CFC23 ; CHF_3) in nano space of synthetic NaY zeolitic pores, adsorptions of flon gases and NMR measurements of ^1H and ^<19>F atoms in flon molecules were planed. First, when adsorptive amounts and chemical-shifts of H- and F-NMR signals were obtained,
(1) the model of adsorptive structure of flon gases on zeolite was proposed.
Next, from the examination of relaxation and correlation times obtained from H- and F-NMR signals strongly influenced by Fe atom as the impurity (360 ppm) in zeolitic crystals, the motion of adsorbed flon molecule was able to be explained. The estimations of following items from (2) to (7) were consequently obtained ;
(2) the structure model arranged between Fe atom and flon molecule,
(3) the relaxation mechanism between Fe atom and H or F atom in flon molecule,
(4) the each nearest lengths between Fe atom and H or F atom in flon molecule,
(5) the correlation times strongly influenced Fe magnetic field to H and F atoms,
(6) the adsorbing life span of flon molecule in zeolitic pores,
(7) the mean diffusing path of flon gas in zeoiitic pores.
Finally, from the adsorptive experiments of flon 22 or 23 on HY or NaY zeolite, the following results have been obtained.
(1) The successful measurements of H- and F-NMR signals have been obtained.
(2) The issue of flon 23 gas adsorbed on NaY zeolite has been accepted (in press).
(3) Next issue of flon 22 will be submitted.
(4) The diffusion coefficient of flon molecule by using the inversion recovery method of NMR has been obtained.
|
Research Products
(9 results)
