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Catalytic Decomposition of Ammonia over Bimetallic CuO/CeO2 Nanoparticle Catalyst

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Volume: 8 | Issue: 4 | Pages: 447-458
DOI: 10.4209/aaqr.2008.07.0031
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Chang-Mao Hung

  • Department of Industry Engineering and Management, Yung-Ta Institute of Technology & Commerce, Pingtung 909, Taiwan, Republic of China

Abstract

The oxidation of ammonia to nitrogen by selective catalytic oxidation (NH3-SCO) over a bimetallic CuO/CeO2 nanoparticle catalyst at temperatures between 423 and 673K. A bimetallic CuO/CeO2 nanoparticle catalyst was prepared by co-precipitation method at molar ratio of 6:4. This study also considers how the concentration of influent NH3 (C0 = 800 ppm), the space velocity (GHSV = 92000/hr), the relative humidity (RH = 12%) and the concentration of oxygen (O2 = 4%) affect the operational stability and the capacity for removing NH3. The catalysts were characterized before and after reaction using EDX, BET, ATR-FTIR, PSA and TEM. The catalytic performance show that the ammonia was removed by oxidation in the presence of bimetallic CuO/CeO2 nanoparticle catalyst, and around 98% at complete NH3 reduction was achieved, and a high selectivity toward N2 during catalytic oxidation over the catalyst at 673K with an oxygen content of 4.0%. Moreover, the effect of the reaction temperature on the removal of NH3 in the gaseous phase was also monitored at a gas hourly space velocity of under 92000/hr.

Keywords

Selective catalytic oxidation (SCO) Tubular fixed-bed reactor (TFBR) Ammonia Bimetallic CuO/CeO2 nanoparticle catalyst


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