Novel Mn-Ce-Ti Mixed-Oxide Catalyst for the Selective Catalytic Reduction of NOx with NH3
Novel Mn-Ce-Ti Mixed-Oxide Catalyst for the Selective Catalytic Reduction of NOx with NH3
复制标题
用于NH3选择性催化还原NOx的新型Mn-Ce-Ti混合氧化物催化剂
DOI：
10.1021/am5038164
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发表时间：
2014-08-27
影响因子：
9.5
通讯作者：
Woo, Seong Ihl
中科院分区：
文献类型：
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作者：
Liu, Zhiming;Zhu, Junzhi;Woo, Seong Ihl
研究了水热法制备的Mn-Ce-Ti复合氧化物催化剂在氧气存在下对NH3选择性催化还原NOx的反应性能。结果表明，环保型Mn-Ce-Ti催化剂具有良好的NH3-SCR活性和较强的抗H2O和SO2能力，具有较宽的使用温度窗口，在柴油机NOx排放控制方面具有很强的实际应用前景。在催化剂表征的基础上，Mn4++Ce3+Mn3++Ce4+，Mn4++Ti3++Mn3++Ti4+的双重氧化还原循环和非晶态结构是催化剂高催化Deno(X)性能的关键。漫反射红外傅里叶变换光谱研究表明，Mn和Ce之间的协同作用促进了活性中间物种的形成，从而促进了NH3-SCR的进行。
Mn-Ce-Ti mixed-oxide catalyst prepared by the hydrothermal method was investigated for the selective catalytic reduction (SCR) of NOx with NH3 in the presence of oxygen. It was found that the environmentally benign Mn-Ce-Ti catalyst exhibited excellent NH3-SCR activity and strong resistance against H2O and SO2 with a broad operation temperature window, which is very competitive for the practical application in controlling the NOx emission from diesel engines. On the basis of the catalyst characterization, the dual redox cycles (Mn4+ + Ce3+ Mn3+ + Ce4+, Mn4+ + Ti3+ Mn3+ + Ti4+) and the amorphous structure play key roles for the high catalytic deNO(x) performance. Diffuse reflectance infrared Fourier transform spectroscopy studies showed that the synergetic effect between Mn and Ce contributes to the formation of reactive intermediate species, thus promoting the NH3-SCR to proceed.