Effect of crystal morphology on the orientation of LTL-type zeolite films

Larlus, Olivier; Tosheva, Lubomira; Hölzl, M.; Mintova, Svetlana; Metzger, T. H.; Valtchev, Valentin

doi:10.1016/s0167-2991(05)80361-1

Cited by 4 publications

(1 citation statement)

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“…24 1.07 nm, and the framework of the Si/Al ratio is typically about 3.0 [1,2]. By virtue of its unique structure and composition, zeolite L has attracted great research interest in its synthesis and characterization [3][4][5][6], adsorptive properties [7][8][9], mixed matrix membranes [10][11][12][13] and catalytic application in various hydrocarbon conversion reactions [14][15][16][17][18][19][20][21][22]. Pt supported on alkaline zeolites is best known as a remarkable catalyst for the aromatization of alkanes [14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal synthesis of zeolite L in a Na+/K+ mixed alkali system

Ahn

2008

Korean J. Chem. Eng.

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Zeolite L was prepared from the substrate system of Na 2 O-K 2 O-Al 2 O 3 -SiO 2 -H 2 O 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 SiO O). Pure and highly crystalline zeolite L could be obtained from a gel with the molar composition 5.4K 2 O-5.7Na 2 O-Al 2 O 3 -30SiO 2 -500H 2 O 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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