MOF-74-M (M = Mn, Co, Ni, Zn, MnCo, MnNi, and MnZn) for Low-Temperature NH3-SCR and In Situ DRIFTS Study Reaction Mechanism,ACS Applied Materials & Interfaces

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MOF-74-M (M = Mn, Co, Ni, Zn, MnCo, MnNi, and MnZn) for Low-Temperature NH3-SCR and In Situ DRIFTS Study Reaction Mechanism
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-10-13 , DOI: 10.1021/acsami.0c11035
Shangzhi Xie ₁ , Qiuju Qin ₁ , Hao Liu ₁ , Lijian Jin ₁ , Xiaoling Wei ₁ , Jiaxing Liu ₁ , Xia Liu ₁ , Yinchao Yao ₁ , Lihui Dong ₁ , Bin Li ₁

Affiliation

Monometallic and bimetallic MOF-74-M (M = Mn, Co, Ni, Zn, MnCo, MnNi, and MnZn) catalysts were prepared by the solvothermal method for NH₃-SCR. XRD, BET, SEM, and EDS-mapping tests indicate the successful synthesis of the MOF-74-M catalyst with uniform distribution of metal elements and large specific surface area, and the morphology is almost hexagonal. Adding Mn element to a single-metal catalyst can enhance activity, which is mainly because of the existence of various valence states of Mn so that it has excellent redox properties; the catalytic activity of water and sulfur resistance tests showed that the catalytic activity of MOF-74-M increases after adding a proper amount of SO₂, mainly because of the increase in acidic sites. In situ DRIFTS results indicate that the low-temperature range of MOF-74-MnCo and MOF-74-Mn is dominated by the E–R mechanism and the high-temperature range is dominated by the L–H mechanism. The entire temperature range of MOF-74-Zn is dominated by the L–H mechanism.

中文翻译：

MOF-74-M（M = Mn，Co，Ni，Zn，MnCo，MnNi和MnZn）用于低温NH ₃ -SCR和原位DRIFTS研究反应机理

采用溶剂热法制备了NH ₃ -SCR单金属和双金属MOF-74-M（M = Mn，Co，Ni，Zn，MnCo，MnNi和MnZn）催化剂。XRD，BET，SEM和EDS映射测试表明，MOF-74-M催化剂的合成成功，金属元素分布均匀且比表面积大，形态几乎为六边形。将Mn元素添加到单金属催化剂中可以提高活性，这主要是由于存在多种价态的Mn，使其具有优异的氧化还原性能。耐水和硫的催化活性测试表明，加入适量的SO ₂后，MOF-74-M的催化活性增加，主要是因为酸性位点的增加。原位DRIFTS结果表明，MOF-74-MnCo和MOF-74-Mn的低温范围受E–R机理支配，而高温范围受L–H机理支配。MOF-74-Zn的整个温度范围受L–H机制控制。

更新日期：2020-10-29

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