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[학술저널]

  • 학술저널

Hu Sik Kim(Andong National University) Seok Hee Lee(Busan National University of Education) Kyun Hye Park(HanKuk Academy of Foreign Studies) Yong Hyun Park(HanKuk Academy of Foreign Studies) Jun Woo Park(HanKuk Academy of Foreign Studies) Ji Hyun Hwang(HanKuk Academy of Foreign Studies) Jong Sam Park(Daegu Health College) Sik Young Choi(Andong National University) Woo Taik Lim(Andong National University)

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초록

To investigate the tendency of Li+ exchange from polar organic solvents, Li+ -ion exchange into zeolite Y (Si/Al = 1.56) was attempted by undried methanol (crystal 1) and formamide (crystal 2) solvent. Two single crystals of Na-Y were treated with 0.1 M LiNO3 in each of the two solvents at 323 K, followed by vacuum dehydration at 723 K. Their structures were determined by single-crystal synchrotron X-ray diffraction techniques in the cubic space group Fd3m, at 100(1) K. In both structures, Li+ for Na+ ions filled preferentially sites I’ and II. The remaining Na+ ions occupied sites I’, II, and III’ in both structures, in additional to above sites, and Na+ ions occupied site I in crystal 2. While the 68 % exchange of Li+ for Na+ was achieved from undried methanol, only 40 % exchange was observed from undried formamide, indicating that the undried methanol was more effective than undried formamide as solvent for Li+ exchange under the conditions employed.

목차

Introduction
Materials and Methods
Results and Discussion
References

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