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Effect of different seed sources on the hydrothermal crystallization of MCM-22 zeolite catalysts


Zeolites are solid acids with several industrial applications, but usually their syntheses are difficult or costly and these facts negatively interfere in their use as catalysts or adsorbents. The seed-assisted approach is an alternative to facilitate the zeolite synthesis, shortening crystallization time, the possibility of performing template free synthesis, decreasing costs and being environmentally friendly. In this study, the seed-assisted synthesis was applied to MCM-22 zeolite. Three types of seeds were studied: the MCM-22, the ball milled MCM-22 and the mother liquor from an unseeded synthesis. The XRD studies showed successful zeolite crystallization in shorter times and SEM images pointed out a decrease in crystal size, giving the ball milled seed the best results. In the presence of seeds, the organic template was reduced up to 50%, but a contamination with zeolite ZSM-5 was detected. The template free synthesis did not lead to crystallization because in the synthesis of low Si/Al ratio zeolites, the interaction between the aluminum and template is needed for the zeolite nucleation, as revealed by carbon and aluminum NMR. Due the decrease in crystal size, the seed-synthesized zeolites had an improved catalytic performance in liquid-phase glycerol condensation with acetone.

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Publication details

The article was received on 22 Mar 2018, accepted on 16 May 2018 and first published on 16 May 2018

Article type: Paper
DOI: 10.1039/C8CE00448J
Citation: CrystEngComm, 2018, Accepted Manuscript
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    Effect of different seed sources on the hydrothermal crystallization of MCM-22 zeolite catalysts

    M. Veiga Rodrigues, L. H. Vieira, G. P. Campos and L. Martins, CrystEngComm, 2018, Accepted Manuscript , DOI: 10.1039/C8CE00448J

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