Model study on the aqueous-phase hydrodechlorination of clopyralid on noble metal catalysts
The aqueous-phase catalytic hydrodechlorination (HDC) of the herbicide clopyralid was studied for the first time. The reaction was carried out on platinum- (Pt), palladium- (Pd) and gold- (Au) based mono- and bimetallic catalysts at 25 °C and atmospheric pressure using a batch reactor. Clopyralid (3...
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| Published in: | Catalysis communications Vol. 14; no. 1; pp. 96 - 100 |
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| Main Authors: | , , |
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25-10-2011
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| Abstract | The aqueous-phase catalytic hydrodechlorination (HDC) of the herbicide clopyralid was studied for the first time. The reaction was carried out on platinum- (Pt), palladium- (Pd) and gold- (Au) based mono- and bimetallic catalysts at 25
°C and atmospheric pressure using a batch reactor. Clopyralid (3,6-dichloropyridine-2-carboxylic acid) is a systemic herbicide from the chemical class of pyridine compounds, which has a high potential to contaminate water sources. The hydrodechlorination of clopyralid (C
6H
3NO
2Cl
2) proceeds step-wise to the monochlorinated intermediates 3-chloropyridine-2-carboxylic acid and 6-chloropyridine-2-carboxylic acid (C
6H
4NO
2Cl) and to the dechlorinated intermediate picolinic acid (C
6H
5NO
2). The dechlorination is followed by hydrogenation with formation of the harmless end product pipecolinic acid (C
6H
10NO
2). With different alumina supported mono- and bimetallic catalysts a complete dechlorination and hydrogenation of clopyralid could be achieved. Pd and PdAu catalysts showed the highest activity for the dechlorination steps whereas the Pt and PtAu catalysts are most active in the complete conversion of clopyralid, i.e. combined dechlorination and hydrogenation. Summarizing, HDC is an easily applicable way to remove clopyralid from water.
► First study on the degradation of clopyralid by catalytic hydrodechlorination. ► Pd, Pt, Au mono- and bimetallic catalysts were tested. ► Degradation via dechlorination and subsequent hydrogenation to pipecolinic acid. ► PtAu catalysts are most active for dechlorination and subsequent hydrogenation. |
|---|---|
| AbstractList | The aqueous-phase catalytic hydrodechlorination (HDC) of the herbicide clopyralid was studied for the first time. The reaction was carried out on platinum- (Pt), palladium- (Pd) and gold- (Au) based mono- and bimetallic catalysts at 25
°C and atmospheric pressure using a batch reactor. Clopyralid (3,6-dichloropyridine-2-carboxylic acid) is a systemic herbicide from the chemical class of pyridine compounds, which has a high potential to contaminate water sources. The hydrodechlorination of clopyralid (C
6H
3NO
2Cl
2) proceeds step-wise to the monochlorinated intermediates 3-chloropyridine-2-carboxylic acid and 6-chloropyridine-2-carboxylic acid (C
6H
4NO
2Cl) and to the dechlorinated intermediate picolinic acid (C
6H
5NO
2). The dechlorination is followed by hydrogenation with formation of the harmless end product pipecolinic acid (C
6H
10NO
2). With different alumina supported mono- and bimetallic catalysts a complete dechlorination and hydrogenation of clopyralid could be achieved. Pd and PdAu catalysts showed the highest activity for the dechlorination steps whereas the Pt and PtAu catalysts are most active in the complete conversion of clopyralid, i.e. combined dechlorination and hydrogenation. Summarizing, HDC is an easily applicable way to remove clopyralid from water.
► First study on the degradation of clopyralid by catalytic hydrodechlorination. ► Pd, Pt, Au mono- and bimetallic catalysts were tested. ► Degradation via dechlorination and subsequent hydrogenation to pipecolinic acid. ► PtAu catalysts are most active for dechlorination and subsequent hydrogenation. |
| Author | Vorlop, K.-D. Teevs, L. Prüße, U. |
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| CitedBy_id | crossref_primary_10_1016_j_cattod_2014_03_052 crossref_primary_10_1021_ie302769p crossref_primary_10_1016_j_cattod_2015_08_013 crossref_primary_10_1016_j_jece_2019_102900 crossref_primary_10_1002_jctb_4030 crossref_primary_10_1016_j_electacta_2018_09_188 crossref_primary_10_1016_j_apcatb_2015_08_008 crossref_primary_10_1016_j_electacta_2016_06_001 crossref_primary_10_3390_molecules27010039 crossref_primary_10_1016_j_apcata_2014_06_030 crossref_primary_10_1016_j_jhazmat_2020_122282 crossref_primary_10_1080_15533174_2012_753628 |
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