Low-Temperature Selective Catalytic Reduction of NO with NH₃ over Fe–Ce–O _x Catalysts

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• 作者：Yan Sun ; Ying Guo ; Wei Su ; Yajuan Wei
• 关键词：Fe–Ce–Ox ; Low ; temperature selective catalytic reduction ; Fe/Ce molar ratio ; Gas hourly space velocity ; Stability ; SO2/H2O resistance
• 刊名：Transactions of Tianjin University
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：23
• 期：1
• 页码：35-42
• 全文大小：
• 刊物类别：Engineering
• 刊物主题：Mechanical Engineering; Science, Humanities and Social Sciences, multidisciplinary;
• 出版者：Tianjin University
• ISSN：1995-8196
• 卷排序：23

文摘

In this study, we used a simple impregnation method to prepare Fe–Ce–O_x catalysts and tested them regarding their low-temperature (200–300 °C) selective catalytic reduction (SCR) of NO using NH₃. We investigated the effects of Fe/Ce molar ratio, the gas hourly space velocity (GHSV), the stability and SO₂/H₂O resistance of the catalysts. The results showed that the FeCe(1:6)O_x (Ce/Fe molar ratio is 1:6) catalyst, which has some ordered parallel channels, exhibited good SCR performance. The FeCe(1:6)O_x catalyst had the highest NO conversion with an activity of 94–99% at temperatures between 200 and 300 °C at a space velocity of 28,800 h−1. The NO conversion for the FeCe(1:6)O_x catalyst also reached 80–98% between 200 and 300 °C at a space velocity of 204,000 h−1. In addition, the FeCe(1:6)O_x catalyst demonstrated good stability in a 10-h SCR reaction at 200–300 °C. Even in the presence of SO₂ and H₂O, the FeCe(1:6)O_x catalyst exhibited good SCR performance.