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Selective Catalytic Oxidation of Ammonia in the Presence of Manganese Catalysts  

Jang, Hyun Tae (Department of Chemical Engineering, Hanseo University)
Park, YoonKook (Chemical System Engineering Department, Hongik University)
Ko, Yong Sig (Department of Advanced Material Chemistry, Shinsung College)
Cha, Wang Seog (School of Civil and Environmental Engineering, Kunsan National University)
Publication Information
Korean Chemical Engineering Research / v.46, no.3, 2008 , pp. 498-505 More about this Journal
Abstract
The selective catalytic oxidation of ammonia was carried out in the presence of natural manganese ore (NMO) and manganese as catalysts using a homemade 1/4" reactor at $10,000hr^{-1}$ of space velocity. The inlet ammonia concentration was maintained at 2,000 ppm, with an air balance. The manganese catalyst resulted in a substantial ammonia conversion, with adsorption activation energies of oxygen and ammonia of 10.5 and 22.7 kcal/mol, respectively. Both $T_{50}$ and $T_{90}$, defined as the temperatures where 50% and 90% of ammonia, respectively, are converted, decreased significantly when alumina-supported manganese catalyst was applied. Increasing the manganese weight percent by 15 wt% increased the lower temperature activity, but 20 wt% of manganese had an adverse effect on the reaction results. An important finding of the study was that the manganese catalyst benefits from a strong sulfur tolerance in the conversion of ammonia to nitrogen.
Keywords
Ammonia; NMO; Catalytic Oxidation; Poisoning;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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