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Design and control of Lewis acid sites in Sn-substituted microporous architectures
Authors:
Mohammed
Khaled
(University College London)
,
Arunabhiram
Chutia
(University College London)
,
June
Callison
(University College London)
,
Peter Philip
Wells
(University College London)
,
Emma
Gibson
(University College London)
,
Andrew Michael
Beale
(University College London)
,
C Richard A
Catlow
(University College London)
,
Robert
Raja
(University of Southampton)
Co-authored by industrial partner:
No
Type:
Journal Paper
Journal:
Journal Of Materials Chemistry A
State:
Published (Approved)
Published:
March 2016
Diamond Proposal Number(s):
10306
Abstract: Monometallic and bimetallic tin-containing framework architectures have been prepared by hydrothermal methods. Structural and spectroscopic techniques were used to probe the nature of the solid-acid sites, at the molecular level, using a combination of XRD, DR UV-Vis, solid state MAS NMR (119Sn, 27Al and 31P) and XAFS. The nature and strength of the solid-acid sites were experimentaly probed by FT-IR spectroscopy using CD3CN as a probe molecule. To elucidate further the local-structure, the structural characteristics of the Sn sites were probed using DFT calculations, with a view to rationalising the experimental findings. These detailed structural and spectroscopic studies revealed the presence of multiple Sn environments, with the monometallic SnAlPO-5 catalyst displaying a greater number of tetrahedral Sn(IV) active centres. These framework Sn(IV) centres generated stong Lewis acid sites, when compared with their bimetallic Co-Sn analogue, thereby affording attractive possibilities for modulating catalytic reactivity.
Subject Areas:
Chemistry,
Materials
Instruments:
B18-Core EXAFS
Added On:
21/03/2016 12:58
Discipline Tags:
Physical Chemistry
Catalysis
Chemistry
Materials Science
Technical Tags:
Spectroscopy
X-ray Absorption Spectroscopy (XAS)
Extended X-ray Absorption Fine Structure (EXAFS)