Tuning the activity of Cu-containing rare earth oxide catalysts for CO oxidation reaction: Cooling while heating paradigm in microwave-assisted synthesis
| Autor: | M. AlKetbi, Abdallah F. Zedan, Amina S. Aljaber, Victor Sebastian, Ayesha A. AlKhoori, Mark A. Baker, Steve S. Hinder, Kyriaki Polychronopoulou, Maguy Abi Jaoude, O. Alnuaimi, Anjana Tharalekshmy |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Nanostructure Inorganic chemistry Oxide chemistry.chemical_element 02 engineering and technology Simultaneous cooling 010402 general chemistry 01 natural sciences Redox Oxygen Catalysis symbols.namesake chemistry.chemical_compound X-ray photoelectron spectroscopy Microwave synthesis General Materials Science Cu-catalysts Mechanical Engineering 021001 nanoscience & nanotechnology Condensed Matter Physics CO oxidation 0104 chemical sciences chemistry Mechanics of Materials symbols 0210 nano-technology Raman spectroscopy Microwave |
| Popis: | (Ce-La-xCu)O2 catalysts with low (3 at.%) and high (10 at.%) Cu content were prepared by conventional microwave (MW) and enhanced microwave methods where air cooling (AC), while heating, was applied. The catalysts were tested for the CO oxidation reaction in the 25–500 °C range using 4%CO/20%O2/He feed gas. Varying spectroscopic, microscopic and catalytic studies were used to probe the effect of synthesis on the nanostructure and the CO oxidation performance. It was found that the synthesis method adopted impacts on the extent of the Cu doping into the (Ce-La)O2 fluorite lattice, hence leading to one and two phases system in the case of catalyst prepared through enhanced (AC) and conventional (MW) microwave methods, respectively. Furthermore, only Ce4+ species were found on the surface of the (Ce-La-10Cu)O2 catalysts synthesized using MW and AC (XPS studies), whereas oxygen vacant sites which are associated with Ce3+ ions were indicated in the sub-surface/bulk (Raman studies). Ultimately, the catalysts with the low and high Cu loading, prepared under the AC-promoted microwave method, presented a superior performance against CO oxidation, exhibiting an overall improvement of the catalytic activity by 16% and 32%, respectively. KP wouldlike to acknowledge the financial support from Abu Dhabi Educational Council (ADEC) through the ADEC 2015 Award for Research Excellence (ADEC B3111 ). KP thanks Khalifa University Core Nanocharacterization Facilities and acknowledges KU and CNCF staff support. AFZ and ASA acknowledges the support of the grant number NPRP 8-1912-1-354 from the Qatar National Research Fund (a member of Qatar Foundation). The microscopy works have been conducted in the �Laboratorio de Microscopias Avanzadas� at �Instituto de Nanociencia de Aragon - Universidad de Zaragoza�. VS acknowledges the LMA-INA for offering access to their instruments and expertise. CIBER-BBN is an initiative funded by the VI National R&D&i Plan 2008-2011 financed by the Instituto de Salud Carlos III with assistance from the European Regional Development Fund . Scopus |
| Databáze: | OpenAIRE |
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