Pd and Pd,In nanoparticles supported on polymer fibres as catalysts for the nitrate and nitrite reduction in aqueous media

Marchesini, Fernanda Albana; Aghemo, Vanina; Moreno, Iván; Navascués, Nuria; Irusta, Silvia; Gutierrez, Laura Beatriz

doi:10.1016/j.jece.2019.103651

Cited by 20 publications

(15 citation statements)

References 58 publications

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“…Since then, most studies are focused on bimetallic catalytic systems, as it is assumed that catalytic nitrate reduction is occurring in two steps: first the reduction of nitrate (

) to nitrite (

) and then nitrite (

) to nitrogen (

) and/or to ammonium (

) [ 21 , 22 , 23 ]. Some studies have reported nitrate (

) removal by using monometallic catalysts, but either the removal efficiencies were very low or the selectivity was higher towards ammonium (

) as a byproduct [ 24 , 25 ]. The influence of Pt nanoparticle size on the catalyst performance has been observed in various hydrogenation reactions [ 26 , 27 , 28 ], but it should be noted that to our knowledge nitrate (

) hydrogenation in liquid phase by using size-controlled supported Pt monometallic catalyst has not been studied yet.…”

Section: Introductionmentioning

confidence: 99%

Effect of Nanoparticle Size in Pt/SiO2 Catalyzed Nitrate Reduction in Liquid Phase

et al. 2021

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Effect of platinum nanoparticle size on catalytic reduction of nitrate in liquid phase was examined under ambient conditions by using hydrogen as a reducing agent. For the size effect study, Pt nanoparticles with sizes of 2, 4 and 8 nm were loaded silica support. TEM images of Pt nanoparticles showed that homogeneous morphologies as well as narrow size distributions were achieved during the preparation. All three catalysts showed high activity and were able to reduce nitrate below the recommended limit of 50 mg/L in drinking water. The highest catalytic activity was seen with 8 nm platinum; however, the product selectivity for N2 was highest with 4 nm platinum. In addition, the possibility of PVP capping agent acting as a promoter in the reaction is highlighted.

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“…Since then, most studies are focused on bimetallic catalytic systems, as it is assumed that catalytic nitrate reduction is occurring in two steps: first the reduction of nitrate (

) to nitrite (

) and then nitrite (

) to nitrogen (

) and/or to ammonium (

) [ 21 , 22 , 23 ]. Some studies have reported nitrate (

) removal by using monometallic catalysts, but either the removal efficiencies were very low or the selectivity was higher towards ammonium (

) hydrogenation in liquid phase by using size-controlled supported Pt monometallic catalyst has not been studied yet.…”

Section: Introductionmentioning

confidence: 99%

Effect of Nanoparticle Size in Pt/SiO2 Catalyzed Nitrate Reduction in Liquid Phase

et al. 2021

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“…9, 10 In the same way, the active phase used usually contains a precious metal (Pd, Pt, Rh, and Ru) promoted with a second metal (Cu, Ni, Mo, Co, and Sn). 11,12 The best catalytic results were found using the PdCu active phase. 7,13 Monometallic Pd catalysts prepared on redox supports or containing oxygen vacancies, such as ZrO 2 , CeO 2 , or TiO 2 , have been studied in different works.…”

Section: Introductionmentioning

confidence: 99%

“…One of the ways to avoid the loss of catalytic material is to use pellets, foams, or monoliths to synthesize structured catalysts. 11,15 Monolith-based structured catalysts with different chemical compositions are widely used in environmental catalytic applications. 16,17 The use of monoliths has the advantage of immobilizing the active phase, thus avoiding contamination of the treated water with metal particles.…”

Section: Introductionmentioning

confidence: 99%

“…Different inert supports such as Al 2 O 3 , SiO 2 , and activated carbon have been used in the catalytic elimination of NO 3 – from water. , In addition, these inert supports have been combined with redox supports, such as ZrO 2 and CeO 2 . , In the same way, the active phase used usually contains a precious metal (Pd, Pt, Rh, and Ru) promoted with a second metal (Cu, Ni, Mo, Co, and Sn). , The best catalytic results were found using the PdCu active phase. , …”

Section: Introductionmentioning

confidence: 99%

“…However, the use of a catalytic powder formulation in suspension is not technologically feasible because of its difficult recovery, leading to contamination of the water to be treated with metal-containing particles. One of the ways to avoid the loss of catalytic material is to use pellets, foams, or monoliths to synthesize structured catalysts. , Monolith-based structured catalysts with different chemical compositions are widely used in environmental catalytic applications. , The use of monoliths has the advantage of immobilizing the active phase, thus avoiding contamination of the treated water with metal particles. Also, monoliths having a macroporous structure with numerous channels allow a better contact between the reactants (H 2 , NO 3 – , NO 2 – , or BrO 3 – ) and the active phase .…”

Section: Introductionmentioning

confidence: 99%

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Development of PdCu Structured Catalysts Based on ZrO₂–CeO₂ Materials Supported on Cordierite Monoliths for Water Remediation: Removal of Hazardous Oxyanions

Peroni

Navas

Bideberripe

et al. 2021

Ind. Eng. Chem. Res.

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The elimination of hazardous oxyanions NO 3 − , NO 2 − , and BrO 3 − from synthetic and real water samples using novel PdCu/10ZrCe (10 wt % ZrO 2 on CeO 2 ) structured catalysts supported on cordierite monoliths was studied in order to avoid loss of the catalytic material during water treatment. The monoliths were coated with different suspensions of the 10ZrCe support. Particle sizes, suspension concentration of 10ZrCe, and pH effects were evaluated. The structured catalyst was tested in a fixed-bed reactor at different flow rates for the elimination of the selected anions. Good results in terms of activity and selectivity to the products of interest (S N 2 : 0.99 and S Br − :1) were obtained in synthetic water. The structured catalyst was reused three times, maintaining its activity and selectivity. It was evaluated in a real water sample but the activity was lower probably due to competition for active sites by different ions present in the sample. The structured catalyst prepared is promising for the development of a system for water remediation, based on PdCu/ZrO 2 −CeO 2 materials.

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Enhancing Localized Electron Density over Pd_1.4Cu Decorated Oxygen Defective TiO_2‐x Nanoarray for Electrocatalytic Nitrite Reduction to Ammonia

Tong,

Tan,

Zhai

et al. 2024

Small

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Electrocatalytic nitrite (NO2−) reduction to ammonia (NH3) is a promising method for reducing pollution and aiding industrial production. However, progress is limited by the lack of efficient selective catalysts and ambiguous catalytic mechanisms. This study explores the loading of PdCu alloy onto oxygen defective TiO2‐x, resulting in a significant increase in NH3 yield (from 70.6 to 366.4 µmol cm−2 h−1 at −0.6 V vs reversible hydrogen electrode) by modulating localized electron density. In situ and operando studies illustrate that the reduction of NO2− to NH3 involves gradual deoxygenation and hydrogenation. The process also demonstrated excellent selectivity and stability, with long‐term durability in cycling and 50 h stability tests. Density functional theory (DFT) calculations elucidate that the introduction of PdCu alloys further amplified electron density at oxygen vacancies (Ovs). Additionally, the Ti─O bond is strengthened as the d‐band center of the Ti 3d rising after PdCu loading, facilitating the adsorption and activation of *NO2. Moreover, the presence of Ovs and PdCu alloy lowers the energy barriers for deoxygenation and hydrogenation, leading to high yield and selectivity of NH3. This insight of controlling localized electron density offers valuable insights for advancing sustainable NH3 synthesis methods.

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Pd and Pd,In nanoparticles supported on polymer fibres as catalysts for the nitrate and nitrite reduction in aqueous media

Cited by 20 publications

References 58 publications

Effect of Nanoparticle Size in Pt/SiO2 Catalyzed Nitrate Reduction in Liquid Phase

Effect of Nanoparticle Size in Pt/SiO2 Catalyzed Nitrate Reduction in Liquid Phase

Development of PdCu Structured Catalysts Based on ZrO₂–CeO₂ Materials Supported on Cordierite Monoliths for Water Remediation: Removal of Hazardous Oxyanions

Enhancing Localized Electron Density over Pd_1.4Cu Decorated Oxygen Defective TiO_2‐x Nanoarray for Electrocatalytic Nitrite Reduction to Ammonia

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Pd and Pd,In nanoparticles supported on polymer fibres as catalysts for the nitrate and nitrite reduction in aqueous media

Cited by 20 publications

References 58 publications

Effect of Nanoparticle Size in Pt/SiO2 Catalyzed Nitrate Reduction in Liquid Phase

Effect of Nanoparticle Size in Pt/SiO2 Catalyzed Nitrate Reduction in Liquid Phase

Development of PdCu Structured Catalysts Based on ZrO2–CeO2 Materials Supported on Cordierite Monoliths for Water Remediation: Removal of Hazardous Oxyanions

Enhancing Localized Electron Density over Pd1.4Cu Decorated Oxygen Defective TiO2‐x Nanoarray for Electrocatalytic Nitrite Reduction to Ammonia

Contact Info

Product

Resources

About

Development of PdCu Structured Catalysts Based on ZrO₂–CeO₂ Materials Supported on Cordierite Monoliths for Water Remediation: Removal of Hazardous Oxyanions

Enhancing Localized Electron Density over Pd_1.4Cu Decorated Oxygen Defective TiO_2‐x Nanoarray for Electrocatalytic Nitrite Reduction to Ammonia