The enhanced SCR performance of Mn/TiO2 catalyst by Mo modification: Identification of the promotion mechanism
The enhanced SCR performance of Mn/TiO2 catalyst by Mo modification: Identification of the promotion mechanism
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DOI：
10.1016/j.ijhydene.2018.07.057
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发表时间：
2018-08
影响因子：
7.2
通讯作者：
Xiao Sun;R. Guo;Jian Liu;Zai-guo Fu;Shuai-wei Liu;W. Pan;Xu Shi;Hao Qin;Zhong-Yi Wang;Xing-yu Liu
中科院分区：
文献类型：
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作者：
Xiao Sun;R. Guo;Jian Liu;Zai-guo Fu;Shuai-wei Liu;W. Pan;Xu Shi;Hao Qin;Zhong-Yi Wang;Xing-yu Liu
采用共沉淀法制备了Mo改性Mn/TiO 2催化剂，并将其应用于NH3脱硝的SCR反应中。在50 ~ 400 °C范围内，Mo改性的Mn/TiO 2比未改性的Mn/TiO 2具有更高的SCR反应效率。在不同Mo掺杂量的Mn/TiO 2催化剂中，MnMo/TiO 2 - 0. 04催化剂不仅具有最高的SCR活性，而且具有最好的N2选择性。此外，MnMo/TiO 2 -0.04比Mn/TiO 2还表现出更强的抗SO2中毒能力。通过BET、XRD、H2-TPR、XPS和NH3-TPD等表征手段对MnMo/TiO 2 -0.04进行了表征，结果表明：MnMo/TiO 2 -0.04的结晶度降低，还原度增加，表面酸性中心增多，沿着出现了表面吸附氧物种和Mn 4+物种的富集。原位DRIFT分析结果表明，在MnMo/TiO 2 - 0. 04催化剂上SCR反应的加速过程可用Langmuir-Hinshewood（L-H）模型来解释。
In this work, Mo-modified Mn/TiO2catalysts synthetized by co-precipitation method were applied in the SCR abatement of NOx by NH3. Ranging from 50 to 400 °C, Mn/TiO2modified with Mo showed higher efficiency in SCR reaction than Mn/TiO2without Mo. Among Mn/TiO2catalysts with different Mo doping amount, MnMo/TiO2-0.04 catalyst showed not only the highest SCR activity but also the best N2selectivity. Furthermore, MnMo/TiO2-0.04 also exhibited stronger resistance to SO2poisoning compared with Mn/TiO2. On the basis of the characterization means including BET, XRD, H2-TPR, XPS and NH3-TPD, MnMo/TiO2-0.04 was characterized with the decreased crystallinity, the increased reducibility and more surface acid sites, along with the enrichment of surface adsorbed oxygen species and Mn4+species. Furthermore, the analysis results ofin situDRIFT study showed that Langmuir-Hinshewood (L-H) model should be employed in explaining the accelerated SCR reaction over MnMo/TiO2-0.04.