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Received February 13, 2008
Accepted March 29, 2008
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Hydrothermal synthesis of zeolite L in a Na+/K+ mixed alkali system
Department of Advanced Material Chemistry, Shinsung University, Dangjin-gun 343-860, Korea 1School of Chemical Science and Engineering, Inha University, Incheon 402-751, Korea
whasahn@inha.ac.kr
Korean Journal of Chemical Engineering, November 2008, 25(6), 1546-1552(7), 10.1007/s11814-008-0254-4
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Abstract
Zeolite L was prepared from the substrate system of Na2O-K2O-Al2O3-SiO2-H2O at temperatures of 373-443 K by hydrothermal crystallization. The influence of various synthesis parameters such as the concentration ratios of the components, starting raw materials, synthesis temperature, gel aging, and stirring on the crystallization was investigated. Investigations revealed that the crystallinity of zeolite L crystals depends on molar ratios of the components such as SiO2/Al2O3, (K2O+Na2O)/SiO2, Na2O/(K2O+Na2O), and H2O/(K2O+Na2O). Pure and highly crystalline zeolite L could be obtained from a gel with the molar composition 5.4K2O-5.7Na2O-Al2O3-30SiO2-500H2O after 24 h at 443 K. It was found that the silica source affected the crystal size of zeolite L, and as the synthesis temperature increased, the average crystal size became larger. The crystal size could be decreased significantly by stirring the gel or subjecting the substrate mixture to an aging treatment at room temperature prior to the hydrothermal treatment. Thermal stability of the zeolite L crystals obtained was also briefly investigated.
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Jacobs G, Alvarez WE, Resasco DE, Appl. Catal. A: Gen., 206(2), 267 (2001)
Kale SM, Singh AP, J. Mol. Catal. A-Chem., 184(1-2), 399 (2002)
Alvarez WE, Resasco DE, Catal. Lett., 8, 53 (1991)
Pan H, Wei G, Yuan H, Huo Q, Li Q, Pan X, Wang W, Yu X, Stud. Surf. Sci. Catal., 170, 1392 (2007)
Calzaferri G, Huber S, Maas H, Minkowski C, Angew. Chem. Int. Ed., 42, 3732 (2003)
Bruhwiler D, Calzaferri G, C.R. Chimie, 8, 391 (2005)
Minkowski C, Calzaferri G, Angew. Chem. Int. Ed., 44, 5325 (2005)
Li H, Devaux A, Popovic Z, Cola LD, Calzaferri G, Micropor. Mesopor. Mater., 95, 112 (2006)
Ko YS, Ahn WS, Bull. Korean Chem. Soc., 20, 173 (1999)
Ko YS, Ahn WS, Powder Technol., 145(1), 10 (2004)
Joshi PN, Kotasthane AN, Shiralkar VP, Zeolites, 10, 598 (1990)
Garces LJ, Makwana VD, Hincapie B, Sacco A, Suib SL, J. Catal., 217(1), 107 (2003)
Bajpai PK, Rao MS, Gokhale KVGK, Ind. Eng. Chem. Prod. Res. Develop., 17, 223 (1978)
Ghamami L, Sand LB, Zeolites, 3, 186 (1983)
Ernst S, Jacobs PA, Martens JA, Weitkamp J, Zeolites, 7, 458 (1987)
Jacobs PA, Martens JA, Stud. Surf. Sci. Catal., 33, 58 (1987)
Bhat RN, Kumar RJ, J. Chem. Tech. Biotech., 48, 453 (1990)
Larlus O, Valtchev VP, Chem. Mater., 16, 3381 (2004)
Mintova S, Valtchev V, Micropor. Mesopor. Mater., 55, 171 (2002)
Ginter DM, Bell AT, Radke CJ, Zeolites, 12, 742 (1992)
Brock AA, Link GN, Poitras PS, Thompson RW, J. Mater. Chem., 3, 907 (1993)
Hamilton KE, Coker EN, Sacco A, Dixon AG, Thompson RW, Zeolites, 13, 645 (1993)
Franklin KR, Lowe BM, Zeolites, 8, 495 (1988)
