Diamond Publications - Search Results

Search Again...

These results only include publications that have been reviewed and processed by Diamond Light Source. To also view papers that have not yet been processed click here.

You can use the folder icon under Actions to collate papers as required. You can then click on View Folder in the left-hand navigation to review and/or download your folder.

One item found (0 items not approved).

Instruments / Technical Area	Publication Details	Published	Actions
B18-Core EXAFS	In Situ EPR Study of the Redox Properties of CuO–CeO 2 Catalysts for Preferential CO Oxidation (PROX) Feng Wang , Robert Büchel , Anton Savitsky , Michal Zalibera , Daniel Widmann , Sotiris E. Pratsinis , Wolfgang Lubitz , Ferdi Schüth Acs Catalysis 6, 3520 - 3530 DOI: 10.1021/acscatal.6b00589 Diamond Proposal Number(s): [10306] Show Abstract ▼ Abstract: Understanding the redox properties of metal oxide based catalysts is a major task in catalysis research. In situ electron paramagnetic resonance (EPR) spectroscopy is capable of monitoring the change of metal ion valences and formation of active sites during redox reactions, allowing for the identification of ongoing redox pathways. Here in situ EPR spectroscopy combined with online gas analysis, supported by ex situ X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), X-ray absorption near edge structure (XANES), temporal analysis of product (TAP), and mass spectrometry (MS) studies, was utilized to study the redox behavior of CuO–CeO2 catalysts under PROX conditions (preferential oxidation of carbon monoxide in hydrogen). Two redox mechanisms are revealed: (i) a synergetic mechanism that involves the redox pair Ce4+/Ce3+ during oxidation of Cu0/Cu+ species to Cu2+ and (ii) a direct mechanism that bypasses the redox pair Ce4+/Ce3+. In addition, EPR experiments with isotopically enriched 17O2 established the synergetic mechanism as the major redox reaction pathway. The results emphasize the importance of the interactions between Cu and Ce atoms for catalyst performance. With the guidance of these results, an optimized CuO–CeO2 catalyst could be designed. A rather wide temperature operation window of 11 K (from 377 to 388 K), with 99% conversion efficiency and 99% selectivity, was achieved for the preferential oxidation of CO in a H2 feed.	Jun 2016

Instruments / Technical Area

Publication Details

Published

Actions

B18-Core EXAFS

In Situ EPR Study of the Redox Properties of CuO–CeO 2 Catalysts for Preferential CO Oxidation (PROX)

Feng Wang , Robert Büchel , Anton Savitsky , Michal Zalibera , Daniel Widmann , Sotiris E. Pratsinis , Wolfgang Lubitz , Ferdi Schüth

Acs Catalysis 6, 3520 - 3530

DOI: 10.1021/acscatal.6b00589

Diamond Proposal Number(s): [10306]

Show Abstract ▼

Jun 2016