氮氧化物（NOx）的危害包括光化学烟雾的形成、酸雨以及直接对人类呼吸系统的负面影响等。NH3选择性催化还原（NH3-SCR）技术已被认为是最有效和最广泛应用的手段之一。其中，涂覆成型技术是制备成型催化剂的关键。球形粉体催化剂材料具有优异的流动性、分散性、均匀性和致密性，对其涂覆非常有益，具有优异的工艺操作性能，有利于制备成型催化剂。
近日，石河子大学化学化工学院新疆兵团绿色化工过程重点实验室工业催化课题组设计了一种具有分级结构的Mn-Ce-Fe-Ti复合氧化物微米球，用于NH3-SCR低温脱硝催化剂。该粉体催化剂兼具多孔球形微纳米材料的优点——纳米级的部分具有较高的比表面积和活性位点；同时微米级的部分可以大大减少涂覆胶黏剂的用量；另外，多孔结构可以有助于气体分子在SCR反应中预吸附，促进气体分子的迁移和运输。该微纳米球形粉体催化剂的设计为制备成型催化剂提供了一条新的途径。
相比于Mn-Ce-Fe-Ti (CP)纳米颗粒，多孔微球Mn-Ce-Fe-Ti (CP-SD)催化剂表现出了更为优异的催化活性。在温度250℃，气体空速(GHSV)为40000 h-1条件下，Mn-Ce-Fe-Ti (CP-SD)催化剂，NO转化率可达100 %；当分别加入5% H2O和100 ppm SO2时，NO的转化率分别为94.0%和87.4%；当同时加入100 ppm SO2+5% H2O时，NO的转化率依然可以达到83.4%。相关内容以“Enhanced selective catalytic reduction of NO with NH3 via porous micro-spherical aggregates of Mn-Ce-Fe-Ti mixed oxide nanoparticles（10.1016/j.gee.2019.05.001）” 为题，在《Green Energy & Environment》（绿色能源与环境，简称GEE）上发表。GEE是Elsevier、Ke Ai和中科院过程所联合创办发行的一本关于绿色能源与环境的学术期刊，主编张锁江院士。该论文第一作者硕士研究生田俊奇和张轲，通讯作者于锋副教授。
图1 喷雾干燥法制备Mn-Ce-Fe-Ti (CP-SD)催化剂。
氮氧化物去除相关文章
一、综述论文
[01] Panpan Li, Feng Yu, Mingyuan Yu, Changjin Tang, Bin Dai*, Lin Dong*. Selective Catalytic Reduction De-NOx Catalysts (选择性氧化还原脱硝催化剂). Progress in Chemistry（化学进展）, 2016, 28(10): 1578-1590. DOI: 10.7536/PC160350
二、低温脱硝
[06] Junqi Tian#, Ke Zhang#, Wei Wang, Fu Wang, Jianming Dan, Shengchao Yang, Jinli Zhang, Bin Dai, Feng Yu*. Enhanced selective catalytic reduction of NO with NH3 via porous micro-spherical aggregates of Mn-Ce-Fe-Ti mixed oxide nanoparticles. Green Energy & Environment. 2019, https://doi.org/10.1016/j.gee.2019.05.001
[05] Chao Wang, Feng Yu*, Mingyuan Zhu, Xugen Wang, Jianming Dan, Jinli Zhang, Peng Cao*, Bin Dai*. Microspherical MnO2-CeO2-Al2O3 mixed oxide for monolithic honeycomb catalyst and application in selective catalytic reduction of NOx with NH3 at 50-150 oC. Chemical Enginering Journal, 2018, 346:182-192. DOI:10.1016/j.cej.2018.04.033
[04] Chao Wang, Feng Yu, Mingyuan Zhu, Changjin Tang, Ke Zhang, Dan Zhao, Lin Dong, Bin Dai*. Highly selective catalytic reduction of NOx by MnOx-CeO2-Al2O3 catalysts prepared by self-propagating high-temperature synthesis. Journal of Environmental Science, 2019, 75: 124-135. DOI: 10.1016/j.jes.2018.03.011
[03] Chao Wang, Feng Yu*, Mingyuan Zhu, Yulin Shi, Jianming Dan, Yin Lv, Xuhong Guo*, Bin Dai*. Up-scaled flash nano-precipitation production route to develop a MnOx-CeO2-Al2O3 catalyst with enhanced activity and H2O resistant performance for NOx selective catalytic reduciton with NH3. Chemical Engineering Research and Design, 2018, 134:476-486. DOI: 10.1016/j.cherd.2018.04.036
[02] Chao Wang, Feng Yu, Mingyuan Zhu, Changjin Tang, Lin Dong, Bin Dai*. Both powdered and performed of MnOx-CeO2-Al2O3 catalysts synthesized by self-propagating high-temperature synthesis for the selective catalystic reduction of NOx with NH3. ACS Omega, 2018, 3(5): 5692-5703. DOI: 10.1021/acsomega.7b01286
[01] Dan Zhao, Chao Wang, Feng Yu*, Yulin Shi, Peng Cao, Jianming Dan, Kai Chen, Yin LV, Xuhong Guo*, Bin Dai*. Enhanced Oxygen Vacancies in a Two-Dimensional MnAl-Layerd Double Oxide Prepared via Flash Nanoprecipitation offers High Selective Catalytic Reduction of NOx with NH3. Nanomaterials, 2018, 8:620. DOI: 10.3390/nano8080620
三、室温脱硝
[02] Ke Zhang, Feng Yu*, Mingyuan Zhu, Jianming Dan, Xugen Wang, Jinli Zhang, Bin Dai*. Enhanced Low Temperature NO Reduction Performance via MnOx-Fe2O3/Vermiculite Monolithic Honeycomb Catalysts. Catalysts, 2018, 8(3):100. DOI: 10.3390/catal8030100
[01] Dan Zhao, Feng Yu*, Amin Zhou, Cunhua Ma, Bin Dai*. High-efficiency removal of NOx using dielectric barrier discharge nonthermal plasma with water as an outer electrode. Plasma Science and Technology, 2018, 20(1):014020. DOI: 10.1088/2058-6272/aa861c
