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On Chloro-fluoro-Carbons adsorbed on Zeolite by the NMR Measurements

通过NMR测量研究沸石上吸附的氯氟碳

基本信息

批准号：
12650774
负责人：
YOSHIDA Toshihisa
金额：
$ 2.18万
依托单位：
Saitama University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12650774/
关键词：
Adsorption Zeolite Flon gas NMR Chemical-Shift Relaxation Time by NMR Motional Correlation Time Adsorptive Structure Adsorbing Time Span

项目摘要

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.

为了了解氟隆气体（CFC22； CHClF_2和CFC23； CHF_3）在合成NaY沸石孔纳米空间的吸附行为，对氟隆气体的吸附进行了规划，并对氟隆分子中的^1H和^<19>原子进行了核磁共振测量。首先，在获得H- nmr和F-NMR信号的吸附量和化学位移的基础上，(1)建立了沸石上氟隆气体的吸附结构模型。其次，通过对沸石晶体中Fe原子作为杂质（360 ppm）强烈影响的H- nmr和F-NMR信号的弛豫和相关时间的检查，可以解释吸附的flon分子的运动。由此得到(2)至(7)项的估计值；(2)铁原子与沸石分子之间排列的结构模型，(3)沸石分子中铁原子与H或F原子之间的弛豫机制，(4)沸石分子中铁原子与H或F原子之间的每个最近长度，(5)相关次数对铁磁场对H和F原子的强烈影响，(6)沸石孔中沸石分子的吸附寿命，(7)沸石孔中沸石气体的平均扩散路径。最后，通过氟隆22和氟隆23在HY或NaY沸石上的吸附实验，得到了以下结果。(1)成功测量了氢核磁共振和氢核磁共振信号。(2)氟隆23气体在NaY沸石上吸附的问题已被接受（已出版）。(3)将提交下一期flon 22。(4)利用核磁共振反演恢复方法获得了氟隆分子的扩散系数。