Catalytic Hydrogenation of Aqueous Phase Nitrate Over Fe/C Catalysts

Shukla, Anshu; Pande, Jayshri V.; Bansiwal, Amit; Osiceanu, Petre; Biniwale, Rajesh B.

doi:10.1007/s10562-009-9899-9

Cited by 22 publications

(15 citation statements)

References 15 publications

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“…Figure 3 depicts the redox mechanism. The use of monometallic Fe catalyst supported on activated carbon was investigated by Shukla et al using batch and continuous reactors [76]. The overall selectivity towards nitrogen was nearly 100% with conversions of approximately 50% in both systems.…”

Section: Monometallic Catalystmentioning

confidence: 99%

“…Mechanism of nitrate reduction over monometallic Fe catalyst[76] Proposed models of Pd and Pd-Cu particles[41] Catalytic reduction of nitrate process using a packed bed reactor[9] Schematic of a hollow fibre dialyser filled with microscopic catalysts[114] (a) CMR interfacial configuration and (b) CMR flow-through configuration [Schematic of the CMR setup used by Chen et al [16] Gas-liquid-solid contact in the porous ceramic reactor [116] SEM image of the polymeric hollow fibre with 27 wt% of catalyst particles Pd:Cu/Al 2 O 3 [21] Mechanism of SCC and DCC in the presence of chloride ions. Adapted from [Schematic of the electrochemical reactor with Nafion-117 membrane as electrolyte [130] Schematic diagram of an electrocatalytic reactor based on Pd-Sn/AC…”

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confidence: 99%

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State-of-the-art and perspectives of the catalytic and electrocatalytic reduction of aqueous nitrates

Martínez

Ortiz

Ortíz

2017

Applied Catalysis B: Environmental

408

280

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. State-of-the-art and perspectives of the catalytic and electrocatalytic reduction of aqueous nitrates.

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Section: Monometallic Catalystmentioning

confidence: 99%

mentioning

confidence: 99%

State-of-the-art and perspectives of the catalytic and electrocatalytic reduction of aqueous nitrates

Martínez

Ortiz

Ortíz

2017

Applied Catalysis B: Environmental

408

280

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“…To our knowledge, there are only a few reports of non-noble metal catalysts for NO 3 -hydrogenation. 23,24 Further, this is one of the first observations of a noble-metal-free hydrogenation catalyst displaying complete (100%) NO 3reduction under near ambient conditions.…”

Section: Resultsmentioning

confidence: 66%

“…18,19,20,21,22 A few reports with base metals exist. 23,24,25,26,27 Compounding this problem, some nitrate reduction methods suffer from limited activity and/or poor yields. 18,19 Many they tend to be unselective, often producing nitrite (NO 2 -) or other partially reduced byproducts (NO, N 2 O) that are as toxic or more so than nitrate itself (Scheme 1a).…”

Section: Introductionmentioning

confidence: 99%

Mild and Selective Hydrogenation of Nitrate to Ammonia in the Absence of Noble Metals

et al. 2020

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Motivated by increased awareness about nitrate contamination of surface waters and its deleterious effects in human and animal health, we sought an alternative, non-noble metal catalyst for the chemical degradation of nitrate. First row transition metal phosphides recently emerged as excellent alternatives for hydrogen evolution and hydrotreating reactions. We demonstrate that a key member of this family, Ni2P, readily hydrogenates nitrate (NO3-) to ammonia (NH3) near ambient conditions with very high selectivity (96%). One of the few non-precious metal-based catalysts for this transformation, and among ca. 1% of catalysts with NH3 selectivity, Ni2P can be recycled multiple times with limited loss of activity. Both nitrite (NO2-) and nitric oxide (NO) intermediates are also hydrogenated. Density functional theory (DFT) indicates that-in the absence of a catalyst-nitrite hydrogenation is the reaction bottleneck. A variety of adsorbates (H, O, N, NO) induce surface reconstruction with top-layer Ni-rich surface stoichiometry. Critically, H saturation coverage on Ni2P(001) is only ca. 3 nm-2, significantly less than that on Pd(111) and Ni(111) of ca. 15-18 nm-2, which may play a key role in allowing coadsorption of NOx-. The ability of Earth-abundant, binary metal phosphides such as Ni2P to catalyze nitrate hydrogenation could transform and help us to better understand the basic science behind catalytic hydrogenation and, in turn, advance the next generation of oxyanion removal technologies. ABSTRACT:Motivated by increased awareness about nitrate contamination of surface waters and its deleterious effects in human and animal health, we sought an alternative, non-noble metal catalyst for the chemical degradation of nitrate. First-row transition metal phosphides recently emerged as excellent alternatives for hydrogen evolution and hydrotreating reactions. We demonstrate that a key member of this family, Ni 2 P readily hydrogenates nitrate (NO 3 -) to ammonia (NH 3 ) near ambient conditions with very high selectivity (96%). One of the few non-precious metal-based catalysts for this transformation, and among ca. 1% of catalysts with NH 3 selectivity, Ni 2 P can be recycled multiple times with limited loss of activity. Both nitrite (NO 2 -) and nitric oxide (NO) intermediates are also hydrogenated. Density functional theory (DFT) indicates that-in the absence of a catalyst-nitrite hydrogenation is the reaction bottleneck. A variety of adsorbates (H, O, N, NO) induce surface reconstruction with top-layer Ni-rich surface stoichiometry. Critically, H saturation coverage on Ni 2 P(001) is only ca. 3 nm -2 , significantly less than that on Pd(111) and Ni(111) of ca. 15-18 nm -2 , which may play a key role in allowing coadsorption of NO x -. The ability of Earth-abundant, binary metal phosphides such as Ni 2 P to catalyze nitrate hydrogenation could transform and help us better understand the basic science behind catalytic hydrogenation and, in turn, advance the next generation of oxyanion removal technologies. Triphenylphosph...

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“…Pu et al [13] also report that the efficiency of nitrate removal by promoting electron migration from nZVI surface to rGO surface is enhanced. Up to now, supported nZVI materials such as goethite [14], diatomite [15], chelating resin [16,17], C [4,18], active carbon [19], biochar [20], silicon [21], graphene [22] have been studied. But these carriers still exist the disadvantages of tedious preparation and high cost.…”

Section: Introductionmentioning

confidence: 99%

A Study on the Mechanism and Kinetic of Nitrate Reduction by the nZVI-g-C3N4/TiO2  Composite Under the Simulated Sunlight

Wei

Tian

Wang

et al. 2021

Preprint

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g-C3N4/TiO2 composite has excellent photoelectric properties and is considered as a good carrier of nanoparticles. A novel composite of nZVI-g-C3N4/TiO2 was successfully synthesized through in-situ growth nZVI on the surface of g-C3N4/TiO2 with liquid phase reduction method. The composite was characterized by TEM, XRD, EDS and evaluated its nitrate removal efficiency. The effects of composite dosage, solution initial pH and HCOOH concentration on nitrate reduction were investigated. The results showed that nitrate was rapidly reduced by nZVI-g-C3N4/TiO2 composite. The dosage of 4 g/L nZVI-g-C3N4/TiO2 composite and 3.0 mM of HCOOH concentration was more suitable for nitrate reduction. Solution initial pH had little impact on the nitrate reduction efficiency, but affected the proportion of the nitrate reduction products. The mechanism of nitrate reduction in the nZVI-gC3N4/TiO2/HCOOH-Xe-lamp system was proposed. The nZVI-gC3N4/TiO2 composite could be considered as a viable and promising technology for water pollution remediation.

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Catalytic Hydrogenation of Aqueous Phase Nitrate Over Fe/C Catalysts

Cited by 22 publications

References 15 publications

State-of-the-art and perspectives of the catalytic and electrocatalytic reduction of aqueous nitrates

State-of-the-art and perspectives of the catalytic and electrocatalytic reduction of aqueous nitrates

Mild and Selective Hydrogenation of Nitrate to Ammonia in the Absence of Noble Metals

A Study on the Mechanism and Kinetic of Nitrate Reduction by the nZVI-g-C3N4/TiO2  Composite Under the Simulated Sunlight

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Catalytic Hydrogenation of Aqueous Phase Nitrate Over Fe/C Catalysts

Cited by 22 publications

References 15 publications

State-of-the-art and perspectives of the catalytic and electrocatalytic reduction of aqueous nitrates

State-of-the-art and perspectives of the catalytic and electrocatalytic reduction of aqueous nitrates

Mild and Selective Hydrogenation of Nitrate to Ammonia in the Absence of Noble Metals

A Study on the Mechanism and Kinetic of Nitrate Reduction by the nZVI-g-C3N4/TiO2&nbsp; Composite Under the Simulated Sunlight

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A Study on the Mechanism and Kinetic of Nitrate Reduction by the nZVI-g-C3N4/TiO2 Composite Under the Simulated Sunlight