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

Title
A co-templating route to the synthesis of Cu SAPO STA-7, giving an active catalyst for the selective catalytic reduction of NO
Authors
Picone, ALWarrender, SJSlawin, AMZDawson, DMAshbrook, SEWright, PAThompson, SPGaberova, LLlewellyn, PLMoulin, BVimont, ADaturi, MPark, MBSung, SKNam, ISHong, SB
POSTECH Authors
Hong, SB
Date Issued
May-2011
Publisher
ELSEVIER SCIENCE BV
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.
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
URI
http://oasis.postech.ac.kr/handle/2014.oak/16576
DOI
10.1016/J.MICROMESO.2011.04.039
ISSN
1387-1811
Article Type
Article
Citation
MICROPOROUS AND MESOPOROUS MATERIALS, vol. 146, no. 1-3, page. 36 - 47, 2011-05
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홍석봉HONG, SUK BONG
Div of Environmental Science & Enginrg
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