Direct activation of microcrystalline zeolites

María Jesús Ortiz-Iniesta, Hero Jan Heeres, Ignacio Melián-Cabrera*

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

In this work a direct activation route of zeolites is assessed. It consists of NH4-exchanging the as-synthesized solids before removing the organic template. Calcination afterwards serves to combust the organic template and creates the Brønsted sites directly; thus applying merely a single thermal step. This method simplifies their activation and the material suffers less thermal stress. The approach was particularly effective for microcrystalline beta and ferrierite zeolites. Thorough investigation of the template content and materials' texture points out to three relevant effects that can explain the effective exchange process: partial removal of the template during exchange creates substantial microporosity (ferrierite), the remaining template is reorganized within the pores (ferrierite) and finally, void space can exist due to the non-perfect matching between the network and template (beta). This shorter method appears suited for microcrystalline zeolites; it was ineffective for crystalline MFI types.

Original languageEnglish
Pages (from-to)208-214
Number of pages7
JournalMicroporous and Mesoporous Materials
Volume171
Early online date15 Jan 2013
DOIs
Publication statusPublished - 1 May 2013

Keywords

  • Calcination
  • H-form zeolites
  • Ion-exchange
  • Void space
  • Zeolite activation

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