Preparation of discrete colloidal ZSM-5 crystals with high Al-content
Artikel i vetenskaplig tidskrift, 2011

A new method for synthesis of discrete colloidal ZSM-5 particles with SiO(2)/Al(2)O(3) M ratios as low as 30 and sizes .4-1 micrometer has been developed. The relation between the synthesis parameters and synthesis yield, crystal structure, crystallinity, particle size and morphology was investigated. The synthesis yield increases and the deviation of the SiO(2)/Al(2)O(3) ratio in the product from that in synthesis mixture decreases with increasing autoclave temperature suggesting that the introduction of aluminium into the zeolite structure is favoured by high autoclave temperature during the synthesis and that temperature determines the lower limit of the SiO(2)/Al(2)O(3) ratio. The SiO(2)/Al(2)O(3) ratio in the synthesis mixture decreases with autoclave temperature suggesting that the introduction of aluminium into the zeolite structure is favoured by high autoclave temperature during the synthesis and that the temperature determines the lower limit of SiO(2)/Al(2)O(3) ratio. Synthesis mixture, aimed to yield a high SiO(2)/Al(2)O(3) ratio, gives smaller zeolite crystals, higher specific surface areas, higher geometric areas (external surface area of the crystals) and a more oval crystal shape compared with lower ratios, synthesised at the same temperature. Higher autoclave temperature during the synthesis gives larger zeolite crystals and a more hexagonal crystal shape compared with zeolites synthesised at lower temperatures, for the same SiO(2)/Al(2)O(3) ratios.

Zeolite particle size

suspensions

SiO(2)/Al(2)O(3) ratio

Colloidal ZSM-5

MFI

membranes

Författare

Börje Sten Gevert

Chalmers, Kemi- och bioteknik, Teknisk ytkemi

Lars Eriksson

Ecotraffic

Chalmers, Kemi- och bioteknik, Teknisk ytkemi

Anders Törncrona

Chalmers, Kemi- och bioteknik, Teknisk ytkemi

Eka Chemicals AB

Journal of Porous Materials

1380-2224 (ISSN) 1573-4854 (eISSN)

Vol. 18 6 723-728

Ämneskategorier

Kemi

DOI

10.1007/s10934-010-9433-x

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Senast uppdaterat

2019-07-17