UZM-9 Á¦¿Ã¶óÀÌÆ®´Â 2000³â´ë ÃÊ¹Ý ¹Ì±¹ÀÇ ¼®À¯ÈÇÐȸ»çÀÎ UOP ¿¬±¸Áø¿¡ ÀÇÇØ Ã³À½À¸·Î Á¦¾ÈµÈ ÀüÇϹеµ ºñ´ëĪ(Charge density mismatch, CDM) ÇÕ¼º¹ýÀ» ÅëÇØ ÇÕ¼ºµÈ ´ëÇ¥Àû ¹°Áú·Î½á ³ôÀº Si ÇÔ·®À» °®´Â LTA Á¦¿Ã¶óÀÌÆ® (3.5 < Si/Al <6) ÀÌ´Ù. CDM ÇÕ¼º¹ýÀº µÎ °¡Áö ÀÌ»óÀÇ ±¸Á¶À¯µµ¹°Áú(Structure-directing agent, SDA)ÀÇ Çù·ÂÀû ±¸Á¶¹èÇâ´É·ÂÀ¸·ÎºÎÅÍ »õ·Î¿î Á¶¼º ¶Ç´Â ±¸Á¶¸¦ °®´Â Á¦¿Ã¶óÀÌÆ®¸¦ ÇÕ¼ºÇÏ´Â ¹æ¹ýÀ¸·Î, UZM-9 Á¦¿Ã¶óÀÌÆ®´Â Tetraethylammonium (TEA+),tetramethylammonium(TMA+),Na+ÀÌ¿ÂÀ» ÀÌ¿ëÇÏ¿© ÇÕ¼ºµÉ ¼ö ÀÖ¾ú´Ù.
º» ¿¬±¸¿¡¼´Â ½ÇÇè°ú ÀÌ·ÐÀû Á¢±ÙÀ» ÅëÇØ °³º°Àû ±âº» ±¸¼º ´ÜÀ§·ÎºÎÅÍ High-silica LTA Á¦¿Ã¶óÀÌÆ®ÀÎ UZM-9ÀÇ ±¸Á¶Çü¼º ¸ÞÄ¿´ÏÁòÀ» ¸íÈ®È÷ ÀÌÇØÇÏ°í, CDM ÇÕ¼º¹ýÀ» ÅëÇÑ ´ÜÀϱ¸Á¶¸¦ °®´Â Á¦¿Ã¶óÀÌÆ®ÀÇ °áÁ¤È °úÁ¤¿¡¼ °¢°¢ÀÇ SDAµéÀÇ ¿ªÇÒ°ú Á¶È¿¡ ´ëÇÑ ÀÌÇØ¿¡ ´ëÇØ ¼¼úÇÏ¿´´Ù.
[12. 12¿ù] È«¼®ºÀ ±³¼ö ¿¬±¸½Ç - Formation pathway for LTA zeolite crystals synthesized via a charge density mismatch approach
J. Am. Chem. Soc. In Press (DOI: 10.1021/ja309831e)
Formation pathway for LTA zeolite crystals synthesized via a charge density mismatch approach
- Min Bum Park, Yoorim Lee, Anmin Zheng, Feng-Shou Xiao, Christopher P. Nicholas, Gregory J. Lewis, and Suk Bong Hong*
ºÐÀÚ¼öÁØ¿¡¼ ÀϾ´Â Á¦¿Ã¶óÀÌÆ®ÀÇ °áÁ¤È ¸ÞÄ¿´ÏÁò¿¡ ´ëÇÑ ÀÌÇØ´Â Çö´ë Á¦¿Ã¶óÀÌÆ® °úÇÐ ºÐ¾ßÀÇ °¡Àå Áß¿äÇÑ ³íÁ¡ÁßÀÇ ÇϳªÀÌ´Ù. ƯÈ÷ Á¦¿Ã¶óÀÌÆ®ÀÇ ±¸Á¶¸¦ Çü¼ºÇÏ´Â ±âº» ±¸¼º ´ÜÀ§·ÎºÎÅÍ Àüü ±¸Á¶ÀÇ Çü¼º¿¡ ´ëÇÑ ¸íÈ®ÇÑ ÀÌÇØ¿¡ ´ëÇؼ´Â ¾ÆÁ÷ ¸¹Àº ¿¬±¸°¡ µÇ¾î ÀÖÁö ¾Ê´Ù. LTA ±¸Á¶¸¦ °®´Â Zeolite A (Si/Al ~ 1)´Â °¡Àå °£´ÜÇÑ ±¸Á¶¸¦ °®´Â Á¦¿Ã¶óÀÌÆ® ÁßÀÇ Çϳª·Î½á Á¦¿Ã¶óÀÌÆ®ÀÇ ÀϹÝÀû °áÁ¤È ¸ÞÄ¿´ÏÁòÀ» ÀÌÇØÇϱä À§ÇÑ ¸ðµ¨·Î °¡Àå ¸¹ÀÌ ¿¬±¸µÇ°í ÀÖ´Â ¹°ÁúÀÌ´Ù. ÇöÀç±îÁö LTA ±¸Á¶¸¦ Çü¼ºÇÏ´Â ´ëÇ¥Àû ±âº» ±¸¼º ´ÜÀ§(lta-, sod-, d4r-cage) Áß Å©±â°¡ °¡Àå ÀÛÀº d4r-cageÀÇ ÀÚ±âÁ¶¸³¿¡ ÀÇÇÑ LTA ±¸Á¶ÀÇ Çü¼ºÀÌ ¿©·¯ ¹®Çå¿¡ ÀϹÝÀûÀ¸·Î º¸°íµÇ°í ÀÖ´Ù.
UZM-9 Á¦¿Ã¶óÀÌÆ®´Â 2000³â´ë ÃÊ¹Ý ¹Ì±¹ÀÇ ¼®À¯ÈÇÐȸ»çÀÎ UOP ¿¬±¸Áø¿¡ ÀÇÇØ Ã³À½À¸·Î Á¦¾ÈµÈ ÀüÇϹеµ ºñ´ëĪ(Charge density mismatch, CDM) ÇÕ¼º¹ýÀ» ÅëÇØ ÇÕ¼ºµÈ ´ëÇ¥Àû ¹°Áú·Î½á ³ôÀº Si ÇÔ·®À» °®´Â LTA Á¦¿Ã¶óÀÌÆ® (3.5 < Si/Al <6) ÀÌ´Ù. CDM ÇÕ¼º¹ýÀº µÎ °¡Áö ÀÌ»óÀÇ ±¸Á¶À¯µµ¹°Áú(Structure-directing agent, SDA)ÀÇ Çù·ÂÀû ±¸Á¶¹èÇâ´É·ÂÀ¸·ÎºÎÅÍ »õ·Î¿î Á¶¼º ¶Ç´Â ±¸Á¶¸¦ °®´Â Á¦¿Ã¶óÀÌÆ®¸¦ ÇÕ¼ºÇÏ´Â ¹æ¹ýÀ¸·Î, UZM-9 Á¦¿Ã¶óÀÌÆ®´Â Tetraethylammonium (TEA+),tetramethylammonium(TMA+),Na+ÀÌ¿ÂÀ» ÀÌ¿ëÇÏ¿© ÇÕ¼ºµÉ ¼ö ÀÖ¾ú´Ù.
º» ¿¬±¸¿¡¼´Â ½ÇÇè°ú ÀÌ·ÐÀû Á¢±ÙÀ» ÅëÇØ °³º°Àû ±âº» ±¸¼º ´ÜÀ§·ÎºÎÅÍ High-silica LTA Á¦¿Ã¶óÀÌÆ®ÀÎ UZM-9ÀÇ ±¸Á¶Çü¼º ¸ÞÄ¿´ÏÁòÀ» ¸íÈ®È÷ ÀÌÇØÇÏ°í, CDM ÇÕ¼º¹ýÀ» ÅëÇÑ ´ÜÀϱ¸Á¶¸¦ °®´Â Á¦¿Ã¶óÀÌÆ®ÀÇ °áÁ¤È °úÁ¤¿¡¼ °¢°¢ÀÇ SDAµéÀÇ ¿ªÇÒ°ú Á¶È¿¡ ´ëÇÑ ÀÌÇØ¿¡ ´ëÇØ ¼¼úÇÏ¿´´Ù.