Citation: Wu Zhuomin, Shi Yong, Li Chunyan, Niu Danyang, Chu Qi, Xiong Wei, Li Xinyong. Synthesis of Bimetallic MOF-74-CoMn Catalyst and Its Application in Selective Catalytic Reduction of NO with CO[J]. Acta Chimica Sinica, ;2019, 77(8): 758-764. doi: 10.6023/A19040129 shu

Synthesis of Bimetallic MOF-74-CoMn Catalyst and Its Application in Selective Catalytic Reduction of NO with CO

Wu Zhuomin ^a ,
Shi Yong ^a,, ,
Li Chunyan ^b ,
Niu Danyang ^a ,
Chu Qi ^a ,
Xiong Wei ^a ,
Li Xinyong ^a

a.
Key Laboratory of Industrial Ecology and Environmental Engineering and State Key Laboratory of Fine Chemicals, School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China
b.
School of Materials, Dalian University of Technology, Dalian 116024, China

Corresponding author: Shi Yong, sys-99@163.com
Received Date: 11 April 2019
Available Online: 8 August 2019
Fund Project: Project supported by the National Natural Science Foundation of China (No. 21677022)the National Natural Science Foundation of China 21677022

Figures(11)

A series of bimetallic MOF-74-CoMn catalysts with different metal ratios have been successfully synthesized by hydrothermal method and applied in selective catalytic reduction of NO with CO (CO-SCR). The experimental procedure for the preparation of MOF-74-CoMn catalyst is as follows:The reaction solution was a 3.28 mmol mixture of Co(NO₃)₂·6H₂O and Mn(NO₃)₂·6H₂O, 1.09 mmol 2, 5-dihydroxyterephthalic acid (H₄DOBDC) and 90 mL ethanol-DMF-water. The molar ratio of mixture (Co/Mn) was 1:0, 1:1, 1:2, 1:4, 1:6, respectively. The reactant solution was ultrasonically stired for 30 min until homogeneous. Then, the mixture was transferred into a 100 mL Teflon autoclave then kept in an oven at 100℃ for 24 h. Finally, after purified with DMF and methanol, the products were dried in a vacuum oven at 80℃ for 24 h to obtain a purple MOF-74-CoMn catalyst, which were stored in vacuum or an inert atmosphere. The prepared sample is referred to as MOF-74-Co1Mnx, where x represents a molar ratio of Co to Mn is 1:x (x=0, 1, 2, 4, 6). The SCR catalytic activities were carried out in a fixed-bed flow reactor in gas stream. The experimental results show that the NO_x conversion rate of bimetallic MOF-74-CoMn catalyst is generally higher than that of single metal MOF-74-Co catalyst, and their reaction temperature window is wider. Especially, MOF-74-Co1Mn2 exhibited the highest selective catalytic reduction of NO with CO (CO-SCR) performance which is close to 100% with a temperature range from 175 to 275℃. Further, the bimetallic MOFs catalysts were characterized by X-ray powder diffraction (XRD), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), N₂ adsorption/desorption, X-ray photoelectron spectroscopy (XPS), Hydrogen-temperature programed reduction (H₂-TPR) and Infrared spectroscopy (FTIR) techniques. The results showed that the synergistic effect between Co and Mn metals could obviously promote the formation of unsaturated metal sites and oxygen vacancies, thereby promoting their catalytic reduction efficiency of selective catalytic reduction of NO with CO (CO-SCR).
- bimetallic organic framework material,
- MOF-74-CoMn,
- selective catalytic reduction,
- carbon monoxide,
- nitrogen oxide,
- hydrothermal method
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