| 저자(한글) |
Kim, Hu Sik,Lee, Seok Hee,Park, Kyun Hye,Park, Yong Hyun,Park, Jun Woo,Hwang, Ji Hyun,Park, Jong Sam,Choi, Sik Young,Lim, Woo Taik |
| 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 $Fd{ bar{3}}m$ , 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. |
