In-situ DRIFTs study for synergistic removal of NOx and o-DCB over hydrotalcite-like structured Cr(x)/LDO catalysts.
In: New Journal of Chemistry, Jg. 47 (2023-07-28), Heft 28, S. 13260-13268
academicJournal
Zugriff:
Developing efficient and stable catalysts for synergistic removal of NOx and dioxin has always been key for controlling air pollution. For this, the hydrotalcite-like structured Cr(x)/LDO catalysts were successfully synthesized for synergistic removal of NOx and o-DCB using a co-precipitation method. The performance test results show that the Cr(0.25)/LDO catalyst has the best catalytic performance, and the NOx and o-DCB conversions are 89% and 82% at 250 °C, respectively. In addition, the reaction mechanism of NH 3 -SCR and o-DCB catalytic oxidation on the surface of the Cr(0.25)/LDO catalyst, and the interaction between the two reactions were investigated by designing in- situ DRIFTS experiments. The results indicate that the NH 3 -SCR reaction follows both E–R and L–H reaction mechanisms. The reaction pathway for the o-DCB oxidation process is proposed: o-DCB → chlorinated phenolate → benzoquinone → maleic acid, formic acid, acetic acid, etc. → H 2 O, CO 2 , HCl. Moreover, there are interactions between NH 3 -SCR and catalytic oxidation of o-DCB. At low temperature, there is obvious competitive adsorption between NH 3 /NO and o-DCB. The competitive adsorption between NH 3 /NO and o-DCB leads to the decrease of the o-DCB conversion. At high temperature, NH 3 -SCR and o-DCB oxidation exhibit a synergistic effect, NO 2 in situ-generated from the oxidation of NO can further participate in the o-DCB oxidation and reduce the accumulation of o-DCB oxidation intermediates on the catalyst surface. The research results contribute to understanding the reaction processes of Cr(x)/LDO catalysts and provide support for practical applications. [ABSTRACT FROM AUTHOR]
Copyright of New Journal of Chemistry is the property of Royal Society of Chemistry and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Titel: |
In-situ DRIFTs study for synergistic removal of NOx and o-DCB over hydrotalcite-like structured Cr(x)/LDO catalysts.
|
---|---|
Autor/in / Beteiligte Person: | Wang, Jiaqing ; Xing, Yi ; Zhang, Hui ; Su, Wei ; Tian, Jinglei ; Zhang, Wenbo ; Jia, Haoqi ; Wang, Yan ; Ma, Mengying |
Zeitschrift: | New Journal of Chemistry, Jg. 47 (2023-07-28), Heft 28, S. 13260-13268 |
Veröffentlichung: | 2023 |
Medientyp: | academicJournal |
ISSN: | 1144-0546 (print) |
DOI: | 10.1039/d3nj01838e |
Schlagwort: |
|
Sonstiges: |
|