Effect of oxygen vacancy on CO{single_bond}NO{single_bond}O{sub 2} reaction over yttria-stabilized zirconia-supported copper oxide catalyst

Journal Article · Thu May 01 04:00:00 EDT 1997 · Industrial and Engineering Chemistry Research

DOI:https://doi.org/10.1021/ie9602724· OSTI ID:509349

Chien, C C; Shi, J Z; Huang, T J ^[1]

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1. National Tsing Hua Univ., Hsinchu (Taiwan, Province of China). Dept. of Chemical Engineering

The effect of oxygen vacancy on the enhancement of activity of CO-NO-O{sub 2} reaction over yttria-stabilized zirconia (YSZ)-supported CuO catalyst was investigated in the present study. The catalysts were prepared by the impregnation method, and their characteristics were studied by temperature-programmed reduction. The catalyst was placed in a flow reactor for performing the temperature-programmed reaction, and the effluent gas was analyzed by an on-line NO{sub x} analyzer, consisting of a chemiluminescence unit and two gas chromatographs in series. The present results indicate that copper oxide supported by YSZ exhibits a higher catalytic activity than that supported by {alpha}-Al{sub 2}O{sub 3}, for the CO-NO-O{sub 2} reaction. The enhanced activity is inferred to result from the formation of interfacial Cu{sub 2}O and the oxygen-ion transfer. Additionally, the probable effect of oxygen vacancy in promoting the CO-O{sub 2} or CO-NO{sub 2} reaction has been elucidated by a mechanism involving oxygen-ion transfer via surface oxygen vacancies of YSZ, which are located at the interface between CuO and YSZ. It was found that the CuO/YSZ catalyst is a promising substitute for the conventional Rh/alumina catalyst.

• Sponsoring Organization: National Science Council, Taipei (Taiwan, Province of China)
• OSTI ID: 509349
• Journal Information: Industrial and Engineering Chemistry Research, Journal Name: Industrial and Engineering Chemistry Research Journal Issue: 5 Vol. 36; ISSN IECRED; ISSN 0888-5885
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
54 ENVIRONMENTAL SCIENCES
CARBON MONOXIDE
CATALYST SUPPORTS
CATALYSTS
CATALYTIC CONVERTERS
CATALYTIC EFFECTS
COPPER OXIDES
NITRIC OXIDE
VACANCIES
YTTRIUM OXIDES
ZIRCONIUM OXIDES