Cargando…
Tailored Alkali Resistance of DeNO(x) Catalysts by Improving Redox Properties and Activating Adsorbed Reactive Species
It is still challenging to develop strongly alkali-resistant catalysts for selective catalytic reduction of NO(x) with NH(3). It is generally believed that the maintenance of acidity is the most important factor because of neutral effects of alkali. This work discovers that the redox properties rath...
Autores principales: | , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Elsevier
2020
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7262565/ https://www.ncbi.nlm.nih.gov/pubmed/32480128 http://dx.doi.org/10.1016/j.isci.2020.101173 |
_version_ | 1783540651935137792 |
---|---|
author | Khan, Mehak Nawaz Han, Lupeng Wang, Penglu Zhang, Dengsong |
author_facet | Khan, Mehak Nawaz Han, Lupeng Wang, Penglu Zhang, Dengsong |
author_sort | Khan, Mehak Nawaz |
collection | PubMed |
description | It is still challenging to develop strongly alkali-resistant catalysts for selective catalytic reduction of NO(x) with NH(3). It is generally believed that the maintenance of acidity is the most important factor because of neutral effects of alkali. This work discovers that the redox properties rather than acidity play decisive roles in improving alkali resistance of some specific catalyst systems. K-poisoned Fe-decorated SO(4)(2−)-modified CeZr oxide (Fe/SO(4)(2−)/CeZr) catalysts show decreased acidity but reserve the high redox properties. The higher reactivity of NH(x) species induced by K poisoning compensates for the decreased amount of adsorbed NH(x), leading to a desired reaction efficiency between adsorbed NH(x) and nitrate species. This study provides a unique perspective in designing an alkali-resistant deNO(x) catalyst via improving redox properties and activating the reactivities of NH(x) species rather than routinely increasing acidic sites for NH(x) adsorption, which is of significance for academic interests and practical applications. |
format | Online Article Text |
id | pubmed-7262565 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | Elsevier |
record_format | MEDLINE/PubMed |
spelling | pubmed-72625652020-06-01 Tailored Alkali Resistance of DeNO(x) Catalysts by Improving Redox Properties and Activating Adsorbed Reactive Species Khan, Mehak Nawaz Han, Lupeng Wang, Penglu Zhang, Dengsong iScience Article It is still challenging to develop strongly alkali-resistant catalysts for selective catalytic reduction of NO(x) with NH(3). It is generally believed that the maintenance of acidity is the most important factor because of neutral effects of alkali. This work discovers that the redox properties rather than acidity play decisive roles in improving alkali resistance of some specific catalyst systems. K-poisoned Fe-decorated SO(4)(2−)-modified CeZr oxide (Fe/SO(4)(2−)/CeZr) catalysts show decreased acidity but reserve the high redox properties. The higher reactivity of NH(x) species induced by K poisoning compensates for the decreased amount of adsorbed NH(x), leading to a desired reaction efficiency between adsorbed NH(x) and nitrate species. This study provides a unique perspective in designing an alkali-resistant deNO(x) catalyst via improving redox properties and activating the reactivities of NH(x) species rather than routinely increasing acidic sites for NH(x) adsorption, which is of significance for academic interests and practical applications. Elsevier 2020-05-18 /pmc/articles/PMC7262565/ /pubmed/32480128 http://dx.doi.org/10.1016/j.isci.2020.101173 Text en © 2020 The Author(s) http://creativecommons.org/licenses/by-nc-nd/4.0/ This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). |
spellingShingle | Article Khan, Mehak Nawaz Han, Lupeng Wang, Penglu Zhang, Dengsong Tailored Alkali Resistance of DeNO(x) Catalysts by Improving Redox Properties and Activating Adsorbed Reactive Species |
title | Tailored Alkali Resistance of DeNO(x) Catalysts by Improving Redox Properties and Activating Adsorbed Reactive Species |
title_full | Tailored Alkali Resistance of DeNO(x) Catalysts by Improving Redox Properties and Activating Adsorbed Reactive Species |
title_fullStr | Tailored Alkali Resistance of DeNO(x) Catalysts by Improving Redox Properties and Activating Adsorbed Reactive Species |
title_full_unstemmed | Tailored Alkali Resistance of DeNO(x) Catalysts by Improving Redox Properties and Activating Adsorbed Reactive Species |
title_short | Tailored Alkali Resistance of DeNO(x) Catalysts by Improving Redox Properties and Activating Adsorbed Reactive Species |
title_sort | tailored alkali resistance of deno(x) catalysts by improving redox properties and activating adsorbed reactive species |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7262565/ https://www.ncbi.nlm.nih.gov/pubmed/32480128 http://dx.doi.org/10.1016/j.isci.2020.101173 |
work_keys_str_mv | AT khanmehaknawaz tailoredalkaliresistanceofdenoxcatalystsbyimprovingredoxpropertiesandactivatingadsorbedreactivespecies AT hanlupeng tailoredalkaliresistanceofdenoxcatalystsbyimprovingredoxpropertiesandactivatingadsorbedreactivespecies AT wangpenglu tailoredalkaliresistanceofdenoxcatalystsbyimprovingredoxpropertiesandactivatingadsorbedreactivespecies AT zhangdengsong tailoredalkaliresistanceofdenoxcatalystsbyimprovingredoxpropertiesandactivatingadsorbedreactivespecies |