A co-templating route to the synthesis of Cu SAPO STA-7, giving an active catalyst for the selective catalytic reduction of NO

A. Lorena Picone, Stewart J. Warrender, Alexandra M. Z. Slawin, Daniel M. Dawson, Sharon E. Ashbrook, Paul A. Wright, Stephen P. Thompson, Lucia Gaberova, Philip L. Llewellyn, Beatrice Moulin, Alexandre Vimont, Marco Daturi, Min Bum Park, Sam Kyung Sung, In-Sik Nam, Suk Bong Hong

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

Copper cyclam (cyclam = 1,4,8,11-tetraazacyclotetradecane) and tetraethylammonium (TEA(+)) act as co-templates for the hydrothermal crystallisation of the silicoaluminophosphate SAPO STA-7, as determined by UV-visible, ESR and solid-state MAS NMR spectroscopies, powder and single crystal X-ray diffraction and chemical analysis. Calcination of the as-prepared solid in flowing oxygen removes all organics to leave Cu(II),H-SAPO STA-7 (hereafter Cu-SAPO STA-7) in which the presence of bridging hydroxyl groups is confirmed by IR and the presence of multiple environments for Cu2+ is shown by IR using NO as a probe molecule. Rietveld analysis of synchrotron X-ray powder diffraction data collected over the temperature range 293-673 K locates Cu2+ cations distributed over four sites: above six membered rings (6MRs) and in the three different 8MR windows of the STA-7 structure. Cu-SAPO STA-7 is a very good catalyst for the selective catalytic reduction of NO with NH3, in the presence or absence of water vapour, so that this approach represents an efficient and effective route to copper-containing SAPO catalysts that obviates the need for an aqueous Cu2+ ion exchange step during preparation. (C) 2011 Elsevier Inc. All rights reserved.

Original languageEnglish
Pages (from-to)36-47
Number of pages12
JournalMicroporous and Mesoporous Materials
Volume146
Issue number1-3
Early online date7 May 2011
DOIs
Publication statusPublished - Dec 2011

Keywords

  • Microporous silicoaluminophosphate
  • Copper cyclam co-template
  • Cu SAPO STA-7
  • Structure analysis
  • Selective catalytic reduction NO
  • STRUCTURE-DIRECTING AGENT
  • EXCHANGED ZSM-5 ZEOLITES
  • NITROGEN MONOXIDE
  • MOLECULAR-SIEVES
  • CU/SIO2 CATALYST
  • OXIDATION-STATE
  • NITRIC-OXIDE
  • COPPER
  • DECOMPOSITION
  • CU-ZSM-5

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