氮氧化物
催化作用
选择性催化还原
氨
结垢
废物管理
化学
空间速度
环境友好型
产量(工程)
材料科学
选择性
有机化学
冶金
工程类
燃烧
生物
生物化学
膜
生态学
作者
Costas N. Costa,Petros G. Savva,J.L.G. Fierro,Angelos M. Efstathiou
标识
DOI:10.1016/j.apcatb.2007.04.018
摘要
We describe here the performance of a novel MgO–CeO2-supported Pt (0.1 wt%) catalyst towards the selective conversion of NO into N2 (SN2 > 80%) by using H2 (H2-SCR) under process conditions similar to those encountered in the NH3-SCR in the low-temperature range of 150–200 °C. At 200 °C, 100% conversion of NO and 85% N2-selectivity were obtained with a feed stream containing 1000 ppm NO, 5% O2, 5% H2O, 10% CO2, 0–0.5% CO, and using 1.5% H2 in the feed as reducing agent (GHSV = 40,000 h−1). Thus, a N2-yield of 85% similar to that obtained in most NH3-SCR applications could make H2-SCR as the most environmentally friendly NOx control catalytic technology with great potential to replace the existing NH3-SCR technology. The latter is currently used industrially mainly in power and nitric acid plants, gas turbines, furnaces, boilers, and waste incinerators for the elimination of NOx. However, this technology faces several problems such as catalyst deterioration, emissions of non-reacted toxic NH3 (ammonia slip), ash odor, air-heaters fouling, and a high running cost.
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