Crystal growth study of K-F nanozeolite and its catalytic behavior in Aldol condensation of benzaldehyde and heptanal enhanced by microwave heating

Siew Fang Wong, Krittanun Deekomwong, Jatuporn Wittayakun, Tau Chuan Ling, Oki Muraza, Farook Adam, Eng Poh Ng

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35 Citations (Scopus)


An investigation of nanosized potassium aluminosilicate F-type zeolite (K-F, structure code EDI) converted from rice husk ash (RHA) is reported. The crystallization process was studied in an organic template-free system under microwave radiation at 100 °C and the evolution was followed by spectroscopy and microscopy techniques. The study indicated that the crystallization rate of K-F zeolite was significantly enhanced using microwave radiation. The zeolite started to nucleate at 0.5 min and flattened cuboid shaped K-F zeolite crystals (ca. 39 nm, Si/Al = 1.26) were formed after 2 min onwards. The nanocrystalline K-F zeolite exhibited good catalytic performance in solvent-free Aldol condensation reaction between benzaldehyde and heptanal, with ca. 75% reactant conversion and ca. 67% jasminaldehyde selectivity even after fifth cycle of reaction.

Original languageEnglish
Pages (from-to)295-301
Number of pages7
JournalMaterials Chemistry and Physics
Publication statusPublished - 1 Aug 2017
Externally publishedYes


  • Base catalyst
  • K-F, Nanozeolite
  • Microwave synthesis
  • Template-free synthesis

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