Low Temperature NH3 Selective Catalytic Reduction of NOx over Substituted MnCr2O4 Spinel-Oxide Catalysts
Low Temperature NH3 Selective Catalytic Reduction of NOx over Substituted MnCr2O4 Spinel-Oxide Catalysts
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DOI：
10.1021/ie200227u
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发表时间：
2011-05
影响因子：
4.2
通讯作者：
M. A. Zamudio;N. Russo;D. Fino
中科院分区：
文献类型：
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作者：
M. A. Zamudio;N. Russo;D. Fino
采用凝胶燃烧合成法制备了用于NH3低温选择性催化还原NOx的Mn1-xMxCr2O4 （M = Mg, Ca; x = 0-0.1）取代尖晶石催化剂。采用x射线衍射（XRD）、布鲁诺尔-埃米特-泰勒（BET）、场发射扫描电镜（FESEM）和程序升温还原（TPR）对催化剂进行了表征，并在程序升温反应（TPRe）装置上对催化剂的催化活性进行了测试，测试温度范围为100-200℃（W/F = 0.072 g·s·cm-3），有氧存在。将碱土金属取代的Mn-Cr尖晶石的催化活性与化学计量MnCr2O4进行了比较，以评价取代的效果。所有尖晶石催化剂均表现出高NO转化率和对N2的高选择性。Mn0.95Ca0.05Cr2O4表现出最好的性能，在125℃下NO转化率为96%，对N2的选择性为97%。所有……
The present work describes the development of Mn1–xMxCr2O4 (M = Mg, Ca; x = 0–0.1) substituted spinel catalysts prepared via gel combustion synthesis for the low-temperature selective catalytic reduction (SCR) of NOx with NH3. The catalysts have been characterized by means of X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET), field emission scanning electron microscopy (FESEM) and temperature programmed reduction (TPR) analyses, whereas their catalytic activity has been tested in a temperature programmed reaction (TPRe) apparatus over a temperature range of 100–200 °C (W/F = 0.072 g·s·cm–3) in the presence of oxygen. The catalytic activity of alkali earth-metal substituted Mn–Cr spinels is compared with that of the stoichiometric MnCr2O4 in order to assess the effect of the substitutions. All the spinel catalysts have shown both high NO conversion and high selectivity to N2. Mn0.95Ca0.05Cr2O4 has shown the best performance, reaching an NO conversion of 96% and a selectivity to N2 of 97% at 125 °C. All...