Cargando…
Annealing Strategies for the Improvement of Low-Temperature NH(3)-Selective Catalytic Reduction Activity of CrMnO(x) Catalysts
[Image: see text] Annealing strategies for the citrate complexation–combustion method have been explored as a simple approach for improving the catalytic activity of mixed Cr–Mn oxides for the NH(3)-selective catalytic reduction of NO(x). Materials prepared at 300 and 400 °C possess largely amorphou...
Autores principales: | , , , , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Chemical Society
2019
|
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6648607/ https://www.ncbi.nlm.nih.gov/pubmed/31459958 http://dx.doi.org/10.1021/acsomega.9b00445 |
_version_ | 1783437908313636864 |
---|---|
author | Zhang, Yanke Li, Wan France, Liam John Chen, Zhihang Zeng, Qiang Guo, Dawei Li, Xuehui |
author_facet | Zhang, Yanke Li, Wan France, Liam John Chen, Zhihang Zeng, Qiang Guo, Dawei Li, Xuehui |
author_sort | Zhang, Yanke |
collection | PubMed |
description | [Image: see text] Annealing strategies for the citrate complexation–combustion method have been explored as a simple approach for improving the catalytic activity of mixed Cr–Mn oxides for the NH(3)-selective catalytic reduction of NO(x). Materials prepared at 300 and 400 °C possess largely amorphous structures, consistent with highly dispersed Cr/Mn components. Annealing at 300 °C for 10 h facilitates the formation of catalysts possessing the largest surface area, reducibility, acidity, and activity window (92–239 °C), while areal activity is measured at 3.8 nmol s(–1) m(–2) and is comparable to values obtained for materials prepared at 400 °C. Conversely, shorter annealing times of 1 and 5 h at 300 °C produce materials that transform NO(x) about 2–3 times faster at equivalent surface area. Characterization demonstrates that simple annealing strategies have significant impact on the physiochemical and textural properties of these materials. Moreover, reducibility, O(α) species, and acidity were correlated against areal activity, but only the latter exhibited a near-linear correlation, indicating its dominance in controlling surface reaction rates. |
format | Online Article Text |
id | pubmed-6648607 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | American Chemical Society |
record_format | MEDLINE/PubMed |
spelling | pubmed-66486072019-08-27 Annealing Strategies for the Improvement of Low-Temperature NH(3)-Selective Catalytic Reduction Activity of CrMnO(x) Catalysts Zhang, Yanke Li, Wan France, Liam John Chen, Zhihang Zeng, Qiang Guo, Dawei Li, Xuehui ACS Omega [Image: see text] Annealing strategies for the citrate complexation–combustion method have been explored as a simple approach for improving the catalytic activity of mixed Cr–Mn oxides for the NH(3)-selective catalytic reduction of NO(x). Materials prepared at 300 and 400 °C possess largely amorphous structures, consistent with highly dispersed Cr/Mn components. Annealing at 300 °C for 10 h facilitates the formation of catalysts possessing the largest surface area, reducibility, acidity, and activity window (92–239 °C), while areal activity is measured at 3.8 nmol s(–1) m(–2) and is comparable to values obtained for materials prepared at 400 °C. Conversely, shorter annealing times of 1 and 5 h at 300 °C produce materials that transform NO(x) about 2–3 times faster at equivalent surface area. Characterization demonstrates that simple annealing strategies have significant impact on the physiochemical and textural properties of these materials. Moreover, reducibility, O(α) species, and acidity were correlated against areal activity, but only the latter exhibited a near-linear correlation, indicating its dominance in controlling surface reaction rates. American Chemical Society 2019-05-17 /pmc/articles/PMC6648607/ /pubmed/31459958 http://dx.doi.org/10.1021/acsomega.9b00445 Text en Copyright © 2019 American Chemical Society This is an open access article published under an ACS AuthorChoice License (http://pubs.acs.org/page/policy/authorchoice_termsofuse.html) , which permits copying and redistribution of the article or any adaptations for non-commercial purposes. |
spellingShingle | Zhang, Yanke Li, Wan France, Liam John Chen, Zhihang Zeng, Qiang Guo, Dawei Li, Xuehui Annealing Strategies for the Improvement of Low-Temperature NH(3)-Selective Catalytic Reduction Activity of CrMnO(x) Catalysts |
title | Annealing Strategies for the Improvement of Low-Temperature
NH(3)-Selective Catalytic Reduction Activity of CrMnO(x) Catalysts |
title_full | Annealing Strategies for the Improvement of Low-Temperature
NH(3)-Selective Catalytic Reduction Activity of CrMnO(x) Catalysts |
title_fullStr | Annealing Strategies for the Improvement of Low-Temperature
NH(3)-Selective Catalytic Reduction Activity of CrMnO(x) Catalysts |
title_full_unstemmed | Annealing Strategies for the Improvement of Low-Temperature
NH(3)-Selective Catalytic Reduction Activity of CrMnO(x) Catalysts |
title_short | Annealing Strategies for the Improvement of Low-Temperature
NH(3)-Selective Catalytic Reduction Activity of CrMnO(x) Catalysts |
title_sort | annealing strategies for the improvement of low-temperature
nh(3)-selective catalytic reduction activity of crmno(x) catalysts |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6648607/ https://www.ncbi.nlm.nih.gov/pubmed/31459958 http://dx.doi.org/10.1021/acsomega.9b00445 |
work_keys_str_mv | AT zhangyanke annealingstrategiesfortheimprovementoflowtemperaturenh3selectivecatalyticreductionactivityofcrmnoxcatalysts AT liwan annealingstrategiesfortheimprovementoflowtemperaturenh3selectivecatalyticreductionactivityofcrmnoxcatalysts AT franceliamjohn annealingstrategiesfortheimprovementoflowtemperaturenh3selectivecatalyticreductionactivityofcrmnoxcatalysts AT chenzhihang annealingstrategiesfortheimprovementoflowtemperaturenh3selectivecatalyticreductionactivityofcrmnoxcatalysts AT zengqiang annealingstrategiesfortheimprovementoflowtemperaturenh3selectivecatalyticreductionactivityofcrmnoxcatalysts AT guodawei annealingstrategiesfortheimprovementoflowtemperaturenh3selectivecatalyticreductionactivityofcrmnoxcatalysts AT lixuehui annealingstrategiesfortheimprovementoflowtemperaturenh3selectivecatalyticreductionactivityofcrmnoxcatalysts |