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Design and control of Lewis acid sites in Sn-substituted microporous architectures

DOI: 10.1039/C5TA10283A DOI Help

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)