Cu-IM-5 as the Catalyst for Selective Catalytic Reduction of NO<i><sub>x</sub></i> with NH<sub>3</sub>: Role of Cu Species and Reaction Mechanism
The role of Cu species in Cu ion-exchanged IM-5 zeolite (Cu-IM-5) regarding the performance in selective catalytic reduction (SCR) of NO<i><sub>x</sub></i> with NH<sub>3</sub> (NH<sub>3</sub>-SCR) and the reaction mechanism was studied. Based on H<s...
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| Format: | Article |
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MDPI AG
2021-02-01
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| Series: | Catalysts |
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| Online Access: | https://www.mdpi.com/2073-4344/11/2/221 |
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| author | Guangying Fu Junwen Chen Yuqian Liang Rui Li Xiaobo Yang Jiuxing Jiang |
| author_facet | Guangying Fu Junwen Chen Yuqian Liang Rui Li Xiaobo Yang Jiuxing Jiang |
| author_sort | Guangying Fu |
| collection | DOAJ |
| description | The role of Cu species in Cu ion-exchanged IM-5 zeolite (Cu-IM-5) regarding the performance in selective catalytic reduction (SCR) of NO<i><sub>x</sub></i> with NH<sub>3</sub> (NH<sub>3</sub>-SCR) and the reaction mechanism was studied. Based on H<sub>2</sub> temperature-programmed reduction (H<sub>2</sub>-TPR) and electron paramagnetic resonance (EPR) results, Cu–O–Cu and isolated Cu species are suggested as main Cu species existing in Cu-IM-5 and are active for SCR reaction. Cu–O–Cu species show a good NH<sub>3</sub>-SCR activity at temperatures below 250 °C, whereas their NH<sub>3</sub> oxidation activity at higher temperatures hinders the SCR performance. At low temperatures, NH<sub>4</sub>NO<sub>3</sub> and NH<sub>4</sub>NO<sub>2</sub> are key reaction intermediates. In situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) suggests a mixed Eley–Rideal (E–R) and Langmuir–Hinshelwood (L–H) mechanism over Cu-IM-5 at low temperatures. |
| first_indexed | 2024-03-09T05:13:57Z |
| format | Article |
| id | doaj.art-6895e7b59cbf4cbab54868f222e2344b |
| institution | Directory Open Access Journal |
| issn | 2073-4344 |
| language | English |
| last_indexed | 2024-03-09T05:13:57Z |
| publishDate | 2021-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Catalysts |
| spelling | doaj.art-6895e7b59cbf4cbab54868f222e2344b2023-12-03T12:46:49ZengMDPI AGCatalysts2073-43442021-02-0111222110.3390/catal11020221Cu-IM-5 as the Catalyst for Selective Catalytic Reduction of NO<i><sub>x</sub></i> with NH<sub>3</sub>: Role of Cu Species and Reaction MechanismGuangying Fu0Junwen Chen1Yuqian Liang2Rui Li3Xiaobo Yang4Jiuxing Jiang5MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-sen University, Guangzhou 510275, ChinaState Key Laboratory of Catalytic Materials and Reaction Engineering, Research Institute of Petroleum Processing, SINOPEC, Beijing 100083, ChinaMOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-sen University, Guangzhou 510275, ChinaMOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-sen University, Guangzhou 510275, ChinaThe ZeoMat Group, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, ChinaMOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-sen University, Guangzhou 510275, ChinaThe role of Cu species in Cu ion-exchanged IM-5 zeolite (Cu-IM-5) regarding the performance in selective catalytic reduction (SCR) of NO<i><sub>x</sub></i> with NH<sub>3</sub> (NH<sub>3</sub>-SCR) and the reaction mechanism was studied. Based on H<sub>2</sub> temperature-programmed reduction (H<sub>2</sub>-TPR) and electron paramagnetic resonance (EPR) results, Cu–O–Cu and isolated Cu species are suggested as main Cu species existing in Cu-IM-5 and are active for SCR reaction. Cu–O–Cu species show a good NH<sub>3</sub>-SCR activity at temperatures below 250 °C, whereas their NH<sub>3</sub> oxidation activity at higher temperatures hinders the SCR performance. At low temperatures, NH<sub>4</sub>NO<sub>3</sub> and NH<sub>4</sub>NO<sub>2</sub> are key reaction intermediates. In situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) suggests a mixed Eley–Rideal (E–R) and Langmuir–Hinshelwood (L–H) mechanism over Cu-IM-5 at low temperatures.https://www.mdpi.com/2073-4344/11/2/221NH<sub>3</sub>-SCRCu-IM-5in situ DRIFTSreaction mechanism |
| spellingShingle | Guangying Fu Junwen Chen Yuqian Liang Rui Li Xiaobo Yang Jiuxing Jiang Cu-IM-5 as the Catalyst for Selective Catalytic Reduction of NO<i><sub>x</sub></i> with NH<sub>3</sub>: Role of Cu Species and Reaction Mechanism Catalysts NH<sub>3</sub>-SCR Cu-IM-5 in situ DRIFTS reaction mechanism |
| title | Cu-IM-5 as the Catalyst for Selective Catalytic Reduction of NO<i><sub>x</sub></i> with NH<sub>3</sub>: Role of Cu Species and Reaction Mechanism |
| title_full | Cu-IM-5 as the Catalyst for Selective Catalytic Reduction of NO<i><sub>x</sub></i> with NH<sub>3</sub>: Role of Cu Species and Reaction Mechanism |
| title_fullStr | Cu-IM-5 as the Catalyst for Selective Catalytic Reduction of NO<i><sub>x</sub></i> with NH<sub>3</sub>: Role of Cu Species and Reaction Mechanism |
| title_full_unstemmed | Cu-IM-5 as the Catalyst for Selective Catalytic Reduction of NO<i><sub>x</sub></i> with NH<sub>3</sub>: Role of Cu Species and Reaction Mechanism |
| title_short | Cu-IM-5 as the Catalyst for Selective Catalytic Reduction of NO<i><sub>x</sub></i> with NH<sub>3</sub>: Role of Cu Species and Reaction Mechanism |
| title_sort | cu im 5 as the catalyst for selective catalytic reduction of no i sub x sub i with nh sub 3 sub role of cu species and reaction mechanism |
| topic | NH<sub>3</sub>-SCR Cu-IM-5 in situ DRIFTS reaction mechanism |
| url | https://www.mdpi.com/2073-4344/11/2/221 |
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