The direct decomposition of NO over the La{sub 2}CuO{sub 4} nanofiber catalyst
- School of Mechanical Engineering M050, University of Western Australia, 35 Stirling Highway, Crawley WA 6009 (Australia)
- Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore 117576 (Singapore)
The NO catalytic direct decomposition was studied over La{sub 2}CuO{sub 4} nanofibers, which were synthesized by using single walled carbon nanotubes (CNTs) as templates under hydrothermal condition. The composition and BET specific surface area of the La{sub 2}CuO{sub 4} nanofiber were La{sub 2}Cu{sub 0.88}{sup 2+}Cu{sub 0.12}{sup +}O{sub 3.94} and 105.0 m{sup 2}/g, respectively. 100% NO conversion (turnover frequency-(TOF): 0.17 g{sub NO}/g{sub catalyst} s) was obtained over such nanofiber catalyst at temperatures above 300 deg. C with the products being only N{sub 2} and O{sub 2}. In 60 h on stream testing, either at 300 deg. C or at 800 deg. C, the nanofiber catalyst still showed high NO conversion efficiency (at 300 deg. C, 98%, TOF: 0.17 g{sub NO}/g{sub catalyst} s; at 800 deg. C, 96%, TOF: 0.16 g{sub NO}/g{sub catalyst} s). The O{sub 2} and NO temperature programmed desorption (TPD) results indicated that the desorption of oxygen over the nanofibers occurred at 80-190 and 720-900 deg. C; while NO desorption happened at temperatures of 210-330 deg. C. NO and O{sub 2} did not competitively adsorb on the nanofiber catalyst. For outstanding the advantage of the nanostate catalyst, the usual La{sub 2}CuO{sub 4} bulk powder was also prepared and studied for comparison. - Graphical abstract: La{sub 2}CuO{sub 4} nanofibers, made by use of single walled carbon nanotubes as templates under mild hydrothermal conditions, could catalytically decompose NO completely into nitrogen and oxygen at the low temperature of 300 deg. C.
- OSTI ID:
- 21212068
- Journal Information:
- Journal of Solid State Chemistry, Vol. 181, Issue 10; Other Information: DOI: 10.1016/j.jssc.2008.06.051; PII: S0022-4596(08)00348-4; Copyright (c) 2008 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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