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Open AccessArticle

Catalysts Promoted with Niobium Oxide for Air Pollution Abatement

Earth and Environmental Engineering Department, Columbia University, New York, NY 10027, USA
Chemical Engineering Department, Columbia University, New York, NY 10027, USA
Chemical Engineering for Energy and the Environment Department, KTH Royal Institute of Technology, 10044 Stockholm, Sweden
Author to whom correspondence should be addressed.
Academic Editor: Morris D. Argyle
Catalysts 2017, 7(5), 144;
Received: 31 March 2017 / Revised: 1 May 2017 / Accepted: 4 May 2017 / Published: 8 May 2017
PDF [2873 KB, uploaded 8 May 2017]


Pt-containing catalysts are currently used commercially to catalyze the conversion of carbon monoxide (CO) and hydrocarbon (HC) pollutants from stationary chemical and petroleum plants. It is well known that Pt-containing catalysts are expensive and have limited availability. The goal of this research is to find alternative and less expensive catalysts to replace Pt for these applications. This study found that niobium oxide (Nb2O5), as a carrier or support for certain transition metal oxides, promotes oxidation activity while maintaining stability, making them candidates as alternatives to Pt. The present work reports that the orthorhombic structure of niobium oxide (formed at 800 °C in air) promotes Co3O4 toward the oxidation of both CO and propane, which are common pollutants in volatile organic compound (VOC) applications. This was a surprising result since this structure of Nb2O5 has a very low surface area (about 2 m2/g) relative to the more traditional Al2O3 support, with a surface area of 150 m2/g. The results reported demonstrate that 1% Co3O4/Nb2O5 has comparable fresh and aged catalytic activity to 1% Pt/γ-Al2O3 and 1% Pt/Nb2O5. Furthermore, 6% Co3O4/Nb2O5 outperforms 1% Pt/Al2O3 in both catalytic activity and thermal stability. These results suggest a strong interaction between niobium oxide and the active component—cobalt oxide—likely by inducing an oxygen defect structure with oxygen vacancies leading to enhanced activity toward the oxidation of CO and propane. View Full-Text
Keywords: cobalt on Nb2O5 catalyst; CO and propane oxidation; promoting effects of Nb2O5 cobalt on Nb2O5 catalyst; CO and propane oxidation; promoting effects of Nb2O5

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Xiang, W.; Han, X.; Astorsdotter, J.; Farrauto, R. Catalysts Promoted with Niobium Oxide for Air Pollution Abatement. Catalysts 2017, 7, 144.

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