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VOx/Fe2O3 Shell–Core Catalysts for the Selective Oxidation of Methanol to Formaldehyde
DOI:
10.1007/s11244-017-0873-2
Authors:
Pip
Hellier
(UK Catalysis Hub, Research Complex at Harwell)
,
Peter P.
Wells
(UK Catalysis Hub, Research Complex at Harwell; University of Southampton; Diamond Light Source)
,
Diego
Gianolio
(Diamond Light Source)
,
Michael
Bowker
(UK Catalysis Hub, Research Complex at Harwell; University of Cardiff)
Co-authored by industrial partner:
No
Type:
Journal Paper
Journal:
Topics In Catalysis
, VOL 158
State:
Published (Approved)
Published:
November 2017
Diamond Proposal Number(s):
15151

Abstract: Efficient oxidation catalysts are important in many current industrial processes, including the selective oxidation of methanol to formaldehyde. Vanadium-containing catalysts have been shown to be effective selective oxidation catalysts for certain reactions, and research continues to examine their applicability to other reactions of interest. Several VOx/Fe2O3 shell–core catalysts with varying VOx coverage have been produced to investigate the stability of VOx monolayers and their selectivity for methanol oxidation. Catalyst formation proceeds via a clear progression of distinct surface species produced during catalyst calcination. At 300 °C the selective VOx overlayer has formed; by 500 °C a sandwich layer of FeVO4 arises between the VOx shell and the Fe2O3 core, inhibiting iron cation participation in the catalysis and enhancing catalyst selectivity. The resulting catalysts, comprising a shell–subshell–core system of VOx/FeVO4/Fe2O3, possess good catalytic activity and selectivity to formaldehyde.
Subject Areas:
Chemistry
Instruments:
B18-Core EXAFS
Documents:
10.1007_s11244-017-0873-2.pdf