Influence of Water on the Oxidation of NO on Pd/TiO2 Photocatalysts
Two series of new photocatalysts were synthesized based on modification with Pd of the commercial P25 photocatalyst (EVONIK®). Two techniques were employed to incorporate Pd nanoparticles on the P25 surface: photodeposition (series Pd-P) and impregnation (series Pd-I). Both series were characterized...
| Autores: | , , , , , , |
|---|---|
| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2020 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/224525 |
| Acceso en línea: | http://hdl.handle.net/10261/224525 |
| Access Level: | acceso abierto |
| Palabra clave: | Photocatalysis NOx TiO2 Pd Water FTIR http://metadata.un.org/sdg/6 Ensure availability and sustainable management of water and sanitation for all |
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Influence of Water on the Oxidation of NO on Pd/TiO2 PhotocatalystsHernández Rodríguez, M.J.Pulido Melián, E.Araña, J.Navío, José AntonioGonzález Díaz, O.M.Santiago, Dunia E.Doña Rodríguez, J. M.PhotocatalysisNOxTiO2PdWaterFTIRhttp://metadata.un.org/sdg/6Ensure availability and sustainable management of water and sanitation for allTwo series of new photocatalysts were synthesized based on modification with Pd of the commercial P25 photocatalyst (EVONIK®). Two techniques were employed to incorporate Pd nanoparticles on the P25 surface: photodeposition (series Pd-P) and impregnation (series Pd-I). Both series were characterized in depth using a variety of instrumental techniques: BET, DRS, XRD, XPS, TEM, FTIR and FESEM. The modified series exhibited a significant change in pore size distribution, but no differences compared to the original P25 with respect to crystalline phase ratio or particle size were observed. The Pd0 oxidation state was predominant in the Pd-P series, while the presence of the Pd2+ oxidation state was additionally observed in the Pd-I series. The photoactivity tests were performed in a continuous photoreactor with the photocatalysts deposited, by dip-coating, on borosilicate glass plates. A total of 500 ppb of NO was used as input flow at a volumetric flow rate of 1.2 L·min−1 , and different relative humidities from 0 to 65% were tested. The results obtained show that under UV-vis or Vis radiation, the presence of Pd nanoparticles favors NO removal independently of the Pd incorporation method employed and independently of the tested relative humidity conditions. This improvement seems to be related to the different interaction of the water with the surface of the photocatalysts in the presence or absence of Pd. It was found in the catalyst without Pd that disproportionation of NO2 is favored through its reaction with water, with faster surface saturation. In contrast, in the catalysts with Pd, disproportionation took place through nitro-chelates and adsorbed NO2 formed from the photocatalytic oxidation of the NO. This different mechanism explains the greater efficiency in NOx removal in the catalysts with Pd. Comparing the two series of catalysts with Pd, Pd-P and Pd-I, greater activity of the Pd-P series was observed under both UV-vis and Vis radiation. It was shown that the Pd0 oxidation state is responsible for this greater activity as the Pd-I series improves its activity in successive cycles due to a reduction in Pd2+ species during the photoactivity tests.Peer reviewedMultidisciplinary Digital Publishing InstituteConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202020202020info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/224525reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttps://doi.org/10.3390/nano10122354Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/2245252026-05-22T06:33:51Z |
| dc.title.none.fl_str_mv |
Influence of Water on the Oxidation of NO on Pd/TiO2 Photocatalysts |
| title |
Influence of Water on the Oxidation of NO on Pd/TiO2 Photocatalysts |
| spellingShingle |
Influence of Water on the Oxidation of NO on Pd/TiO2 Photocatalysts Hernández Rodríguez, M.J. Photocatalysis NOx TiO2 Pd Water FTIR http://metadata.un.org/sdg/6 Ensure availability and sustainable management of water and sanitation for all |
| title_short |
Influence of Water on the Oxidation of NO on Pd/TiO2 Photocatalysts |
| title_full |
Influence of Water on the Oxidation of NO on Pd/TiO2 Photocatalysts |
| title_fullStr |
Influence of Water on the Oxidation of NO on Pd/TiO2 Photocatalysts |
| title_full_unstemmed |
Influence of Water on the Oxidation of NO on Pd/TiO2 Photocatalysts |
| title_sort |
Influence of Water on the Oxidation of NO on Pd/TiO2 Photocatalysts |
| dc.creator.none.fl_str_mv |
Hernández Rodríguez, M.J. Pulido Melián, E. Araña, J. Navío, José Antonio González Díaz, O.M. Santiago, Dunia E. Doña Rodríguez, J. M. |
| author |
Hernández Rodríguez, M.J. |
| author_facet |
Hernández Rodríguez, M.J. Pulido Melián, E. Araña, J. Navío, José Antonio González Díaz, O.M. Santiago, Dunia E. Doña Rodríguez, J. M. |
| author_role |
author |
| author2 |
Pulido Melián, E. Araña, J. Navío, José Antonio González Díaz, O.M. Santiago, Dunia E. Doña Rodríguez, J. M. |
| author2_role |
author author author author author author |
| dc.contributor.none.fl_str_mv |
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72] |
| dc.subject.none.fl_str_mv |
Photocatalysis NOx TiO2 Pd Water FTIR http://metadata.un.org/sdg/6 Ensure availability and sustainable management of water and sanitation for all |
| topic |
Photocatalysis NOx TiO2 Pd Water FTIR http://metadata.un.org/sdg/6 Ensure availability and sustainable management of water and sanitation for all |
| description |
Two series of new photocatalysts were synthesized based on modification with Pd of the commercial P25 photocatalyst (EVONIK®). Two techniques were employed to incorporate Pd nanoparticles on the P25 surface: photodeposition (series Pd-P) and impregnation (series Pd-I). Both series were characterized in depth using a variety of instrumental techniques: BET, DRS, XRD, XPS, TEM, FTIR and FESEM. The modified series exhibited a significant change in pore size distribution, but no differences compared to the original P25 with respect to crystalline phase ratio or particle size were observed. The Pd0 oxidation state was predominant in the Pd-P series, while the presence of the Pd2+ oxidation state was additionally observed in the Pd-I series. The photoactivity tests were performed in a continuous photoreactor with the photocatalysts deposited, by dip-coating, on borosilicate glass plates. A total of 500 ppb of NO was used as input flow at a volumetric flow rate of 1.2 L·min−1 , and different relative humidities from 0 to 65% were tested. The results obtained show that under UV-vis or Vis radiation, the presence of Pd nanoparticles favors NO removal independently of the Pd incorporation method employed and independently of the tested relative humidity conditions. This improvement seems to be related to the different interaction of the water with the surface of the photocatalysts in the presence or absence of Pd. It was found in the catalyst without Pd that disproportionation of NO2 is favored through its reaction with water, with faster surface saturation. In contrast, in the catalysts with Pd, disproportionation took place through nitro-chelates and adsorbed NO2 formed from the photocatalytic oxidation of the NO. This different mechanism explains the greater efficiency in NOx removal in the catalysts with Pd. Comparing the two series of catalysts with Pd, Pd-P and Pd-I, greater activity of the Pd-P series was observed under both UV-vis and Vis radiation. It was shown that the Pd0 oxidation state is responsible for this greater activity as the Pd-I series improves its activity in successive cycles due to a reduction in Pd2+ species during the photoactivity tests. |
| publishDate |
2020 |
| dc.date.none.fl_str_mv |
2020 2020 2020 |
| dc.type.none.fl_str_mv |
info:eu-repo/semantics/article http://purl.org/coar/resource_type/c_6501 Publisher's version info:eu-repo/semantics/publishedVersion |
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article |
| status_str |
publishedVersion |
| dc.identifier.none.fl_str_mv |
http://hdl.handle.net/10261/224525 |
| url |
http://hdl.handle.net/10261/224525 |
| dc.language.none.fl_str_mv |
Inglés |
| language_invalid_str_mv |
Inglés |
| dc.relation.none.fl_str_mv |
https://doi.org/10.3390/nano10122354 Sí |
| dc.rights.none.fl_str_mv |
info:eu-repo/semantics/openAccess |
| eu_rights_str_mv |
openAccess |
| dc.publisher.none.fl_str_mv |
Multidisciplinary Digital Publishing Institute |
| publisher.none.fl_str_mv |
Multidisciplinary Digital Publishing Institute |
| dc.source.none.fl_str_mv |
reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC instname:Consejo Superior de Investigaciones Científicas (CSIC) |
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Consejo Superior de Investigaciones Científicas (CSIC) |
| reponame_str |
DIGITAL.CSIC. Repositorio Institucional del CSIC |
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DIGITAL.CSIC. Repositorio Institucional del CSIC |
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