Studies on the crystallization process of BEA/MOR co-crystalline zeolite
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BEA/MOR co-crystalline zeolite was synthesized using tetraethylammonium-fluorides as composite templates. The crystallization process of BEA/MOR co-crystalline zeolite was systematically investigated based on XRD, ICP, SEM, TGA, and nitrogen adsorption characterizations. Through the XRD patterns of the samples with different crystallization times, the BEA and MOR phases did not appear simultaneously in the crystallization process. The BEA phase was the favored product at the beginning of crystallization, whereafter the MOR phase emerged, and the BEA/MOR co-crystalline zeolite was gradually formed. The morphology of obtained particles changed a little during the crystallization process, but the granularity distribution range broadened. Asymmetry of BEA/MOR co-crystalline zeolite particles led to uneven distribution of the mesopores. It is showed that the pore size distribution of the samples with more than 90-h crystallization period exhibited bimodal mesopores distribution, and the pore sizes of the extra mesopores were 4.9 and 5.6 nm, respectively. Based on these results, the crystallization mechanism of BEA/MOR co-crystalline zeolite in tetraethylammonium-fluoride binary templates was roughly proposed.
KeywordsZeolite Mordenite Crystallization Time Zeolite Beta Fluoride Anion
This work was financially supported by the National Basic Research Program of China, grant No. 2003CB615802.
- 5.Belandría LN, Días CSG, Hernández JC, Uzcátegui A, González G, Imbert F (2005) North American Catalysis Society 19th North American Meeting, May 2005, Philadelphia, p 262Google Scholar
- 6.Szostak R (1988) Molecular sieves principles of synthesis and identification, 2nd edn. Blackie Academic & Professional, London, p 62Google Scholar
- 10.Goossens AM, Wouters BH, Grobet PJ, Buschmann V, Fiermans L, Martens JA (2001) Eur J Inorg Chem 2001:1167. doi:10.1002/1099-0682(200105)2001:5≤1167::AID-EJIC1167≥3.0.CO;2-ZGoogle Scholar
- 13.Jacobs PA, Martens JA (1987) Synthesis of high-silica aluminosilicate zeolites, studies in surface science and catalysis, vol 33, Elsevier Science, Amsterdam, p 342Google Scholar
- 16.Liu X, Lin B, Qi X, Chen G (2003) CN patent 1397493Google Scholar
- 22.Qi X, Li S, Wang Z, Liu X, Lin B (2003) Chin J Catal 24:535Google Scholar
- 23.Qi X, Li S, Li B, Li N, Liu X, Lin B (2004) Chin J Catal 25:163Google Scholar
- 24.Qi X, Zheng J, Liu X (2006) In: Newman AM (ed) Focus on solid state chemistry, Nova Publishers, New York, p 95Google Scholar
- 27.Qi X, Wang Z, Li S, Li B, Liu X, Lin B (2006) Acta Phys-Chim Sin 22:198Google Scholar
- 30.Qi X, Liu X, Chen G, Lin B (2000) Chem J Chin Univ 21:1161Google Scholar
- 33.Rouquerol J, Rouquerol F, Sing KSW (1999) Adsorption by powders and porous solids: principle, methodology and applications. Academic Press, London, p 440Google Scholar