Journal
APPLIED SURFACE SCIENCE
Volume 364, Issue -, Pages 75-80Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2015.12.112
Keywords
Iron oxide nanoparticle; Gold catalyst; Catalytic oxidation; Carbon monoxide; Formaldehyde
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Funding
- National Natural Science Foundation of China [21477092]
- Natural Science Foundation of Hubei Province [2014CFB182]
- National Fund for Fostering Talents in Basic Sciences [j1103409]
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This study aimed to optimize synthesis of gold catalyst supported on nanosized iron oxide and to evaluate the activity in oxidation of carbon monoxide and formaldehyde. Nanosized iron oxide was prepared from a colloidal dispersion of hydrous iron oxide through a dispersion-precipitation method. Gold was adsorbed onto nanosized iron oxide under self-generated basic conditions. Characterization results indicate that the iron oxide consisted of hematite/maghemite composite with primary particle sizes of 6-8 nm. Gold was highly dispersed on the surface of the support. The catalysts showed good activity in the oxidation of airborne carbon monoxide and formaldehyde. The optimal pH for their synthesis was similar to 7. The catalytic performance could be enhanced by extending the adsorption time of gold species on the support within 21 h. The optimized catalyst was capable of achieving complete oxidation of 1% carbon monoxide at -20 degrees C and 33% conversion of 450 ppm formaldehyde at ambient temperature. The catalyst may be applicable to indoor air purification. (C) 2015 Elsevier B.V. All rights reserved.
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