Selective catalytic reduction of NOx with NH3 over a novel Co-Ce-Ti catalyst
Selective catalytic reduction of NOx with NH3 over a novel Co-Ce-Ti catalyst
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在新型 Co-Ce-Ti 催化剂上用 NH3 选择性催化还原 NOx
DOI：
10.1016/j.cattod.2020.05.040
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发表时间：
2020-05
期刊：
影响因子：
5.3
通讯作者：
Zhiming Liu
中科院分区：
文献类型：
--
作者：
Zhihua Wang;Jianmin Lan;Masaaki Haneda;Zhiming Liu
采用水热法制备了一种用于NH3选择性催化还原NOx的新型Co-Ce-Ti复合氧化物催化剂。Co-Ce-Ti催化剂在较宽的温度范围内表现出较高的NH3-SCR性能，优于Co-Ti和Ce-Ti催化剂。催化剂表征结果表明，在Co-Ce-Ti催化剂上，氧化还原循环(Co3++Ce3+↔、Co2++Ce4+)对催化剂的高催化性能起着重要作用。Co-Ce-Ti催化剂上Co和Ce之间的协同作用既改善了催化剂的还原性能，又增加了催化剂的酸性。现场漂移结果表明，在Co-Ce-Ti催化剂上生成了更多的活性NH3/NH4+物种，从而促进了NOx的NH3-SCR反应。目前的Co-Ce-Ti催化剂具有很大的实际应用潜力。
A novel Co-Ce-Ti composite oxide catalyst prepared by the hydrothermal method has been developed for the selective catalytic reduction of NOxby NH3. Co-Ce-Ti catalyst exhibited high NH3-SCR performance in a wide temperature window, which is superior to that of Co-Ti and Ce-Ti catalysts. Catalyst characterization results revealed that over Co-Ce-Ti catalyst the redox cycle (Co3++ Ce3+↔ Co2++ Ce4+) plays an important role for the high catalytic NH3-SCR performance. The synergetic effect between Co and Ce over Co-Ce-Ti catalyst resulted in both improved reducibility and increased acidity. In situ DRIFTS results clarified that over Co-Ce-Ti catalyst more reactive NH3/NH4+species is formed, thus promoting the NH3-SCR of NOxto proceed. The present Co-Ce-Ti catalyst has great potential to be used for practical deNOxapplication.
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