Microstructural evolution of condensed aggregates during the crystallization of ZSM-5 from a heterogeneous system

Edgar Cardenas, Wilson Aguilar-Mamani, Cheuk Wai Tai, Saul Cabrera, Jonas Hedlund, Johanne Mouzon

Research output: Contribution to journalArticlepeer-review

Abstract

The microstructural evolution of precursors of ZSM-5 zeolite crystallized from a heterogeneous system using fumed silica, sodium aluminate and tetrapropylammonium ions as reagents is investigated. Entities previously described by Ren et al. (Chem. Mater. 2012, 24, 10, 1726-1737) as condensed aggregates, were extensively studied using scanning electron microscopy, and energy dispersive spectroscopy. It was observed that the condensed aggregates first comprise a core of nanocrystals that is enveloped by a shell of amorphous gel phase. During crystallization, the amorphous shell surrounding the core is converted into ZSM-5 crystals that grow to a film surrounding the core. The crystals in the film grow competitively with nutrients provided by the liquid phase from the surroundings, while the nanocrystals in the core show little or no signs of growth.

Original languageEnglish
Article number126188
JournalJournal of Crystal Growth
Volume568-569
DOIs
StatePublished - 15 Aug 2021

Bibliographical note

Funding Information:
The Swedish International Development Cooperation Agency (SIDA) is acknowledged for financially supporting the scientific work. The Knut and Alice Wallenberg foundation is acknowledged for financially supporting the Magellan SEM instrument at Luleå University of Technology and an equipment grant for the electron microscopy faculties at Stockholm University.

Funding Information:
This work was supported by the Swedish International Development Cooperation Agency (SIDA)

Funding Information:
The Swedish International Development Cooperation Agency (SIDA) is acknowledged for financially supporting the scientific work. The Knut and Alice Wallenberg foundation is acknowledged for financially supporting the Magellan SEM instrument at Lulea? University of Technology and an equipment grant for the electron microscopy faculties at Stockholm University.

Publisher Copyright:
© 2021 Elsevier B.V.

Keywords

  • A1. Characterization
  • A1. Crystal morphology
  • A2. Hydrothermal crystal growth
  • B1. Zeolite

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