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

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...

Full description

Bibliographic Details
Main Authors: Guangying Fu, Junwen Chen, Yuqian Liang, Rui Li, Xiaobo Yang, Jiuxing Jiang
Format: Article
Language:English
Published: MDPI AG 2021-02-01
Series:Catalysts
Subjects:
NH<sub>3</sub>-SCR
Cu-IM-5
in situ DRIFTS
reaction mechanism
Online Access:https://www.mdpi.com/2073-4344/11/2/221
id doaj-6895e7b59cbf4cbab54868f222e2344b
record_format Article
spelling doaj-6895e7b59cbf4cbab54868f222e2344b2021-02-08T00:03:39ZengMDPI AGCatalysts2073-43442021-02-011122122110.3390/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
collection DOAJ
language English
format Article
sources DOAJ
author Guangying Fu
Junwen Chen
Yuqian Liang
Rui Li
Xiaobo Yang
Jiuxing Jiang
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
author_facet Guangying Fu
Junwen Chen
Yuqian Liang
Rui Li
Xiaobo Yang
Jiuxing Jiang
author_sort Guangying Fu
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_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_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_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
publisher MDPI AG
series Catalysts
issn 2073-4344
publishDate 2021-02-01
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.
topic NH<sub>3</sub>-SCR
Cu-IM-5
in situ DRIFTS
reaction mechanism
url https://www.mdpi.com/2073-4344/11/2/221
work_keys_str_mv AT guangyingfu cuim5asthecatalystforselectivecatalyticreductionofnoisubxsubiwithnhsub3subroleofcuspeciesandreactionmechanism
AT junwenchen cuim5asthecatalystforselectivecatalyticreductionofnoisubxsubiwithnhsub3subroleofcuspeciesandreactionmechanism
AT yuqianliang cuim5asthecatalystforselectivecatalyticreductionofnoisubxsubiwithnhsub3subroleofcuspeciesandreactionmechanism
AT ruili cuim5asthecatalystforselectivecatalyticreductionofnoisubxsubiwithnhsub3subroleofcuspeciesandreactionmechanism
AT xiaoboyang cuim5asthecatalystforselectivecatalyticreductionofnoisubxsubiwithnhsub3subroleofcuspeciesandreactionmechanism
AT jiuxingjiang cuim5asthecatalystforselectivecatalyticreductionofnoisubxsubiwithnhsub3subroleofcuspeciesandreactionmechanism
_version_ 1724280403541360640

Similar Items