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Title: Aluminium doped ceria–zirconia supported palladium-alumina catalyst with high oxygen storage capacity and CO oxidation activity

Graphical abstract: Ce{sub 0.5}Zr{sub 0.3}Al{sub 0.2}O{sub 1.9}/Pd/γ-Al{sub 2}O{sub 3} possessed high OSC and CO oxidation activity at low temperature. - Highlights: • A new OSC material of Ce{sub 0.5}Zr{sub 0.3}Al{sub 0.2}O{sub 1.9}/Pd/γ-Al{sub 2}O{sub 3} is prepared via a mechanochemical method. • Ce{sub 0.5}Zr{sub 0.3}Al{sub 0.2}O{sub 1.9}/Pd/γ-Al{sub 2}O{sub 3} showed high OSC even after calcination at 1000 °C for 20 h. • Ce{sub 0.5}Zr{sub 0.3}Al{sub 0.2}O{sub 1.9}/Pd/γ-Al{sub 2}O{sub 3} exhibited the highest CO oxidation activity at low temperature correlates with enhanced OSC. - Abstract: The Ce{sub 0.5}Zr{sub 0.3}Al{sub 0.2}O{sub 1.9}/Pd-γ-Al{sub 2}O{sub 3} catalyst prepared by a mechanochemical route and calcined at 1000 °C for 20 h in air atmosphere to evaluate the thermal stability. The prepared Ce{sub 0.5}Zr{sub 0.3}Al{sub 0.2}O{sub 1.9}/Pd-γ-Al{sub 2}O{sub 3} catalyst was characterized for the oxygen storage capacity (OSC) and CO oxidation activity in automotive catalysis. For the characterization, X-ray diffraction, transmission electron microscopy and the Brunauer–Emmet–Teller (BET) technique were employed. The OSC values of all samples were measured at 600 °C using thermogravimetric-differential thermal analysis. Ce{sub 0.5}Zr{sub 0.3}Al{sub 0.2}O{sub 1.9}/Pd-γ-Al{sub 2}O{sub 3} catalyst calcined at 1000 °C for 20 h with a BET surface area of 41 m{sup 2} g{sup −1} exhibited the considerably high OSC ofmore » 583 μmol-O g{sup −1} and good OSC performance stability. The same synthesis route was employed for the preparation of the CeO{sub 2}/Pd-γ-Al{sub 2}O{sub 3} and Ce{sub 0.5}Zr{sub 0.5}O{sub 2}/Pd-γ-Al{sub 2}O{sub 3} for comparison.« less
Authors:
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Publication Date:
OSTI Identifier:
22290350
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 48; Journal Issue: 12; Conference: ISFM 2012: 5. international symposium on functional materials, Perth, WA (Australia), 17-20 Dec 2012; Other Information: Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM; ALUMINIUM OXIDES; CARBON MONOXIDE; CATALYSTS; CERIUM OXIDES; DOPED MATERIALS; OXIDATION; PALLADIUM; SURFACE AREA; THERMAL GRAVIMETRIC ANALYSIS