Catalytic reduction of nitrite in water over ceria- and ceria–zirconia-supported Pd catalysts

Hur, Young Gul; Kim, Min Sung; Lee, Kwan Young

doi:10.1016/j.molcata.2015.01.012

Cited by 23 publications

(7 citation statements)

References 47 publications

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“…As a fast, efficient and clean process, the catalytic hydrogenation has been considered as a promising approach to treat harmful reducible contaminants in water since the first report on the catalytic hydrogenation of nitrate in water by Vorlop and Tacke in 1989 25 . Because it could be conducted under mild conditions without the production of contaminated disposals, this process has been extensively investigated for the removal of various contaminants from water, including nitrate 26 27 , nitrite 28 , perchlorate 29 30 , chlorinated organic contaminants 31 , chromium (VI) 32 , and azo dyes 33 . In 2010, Chen et al .…”

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confidence: 99%

Creation of Pd/Al2O3 Catalyst by a Spray Process for Fixed Bed Reactors and Its Effective Removal of Aqueous Bromate

Gao

Sun

Yang

et al. 2017

Sci Rep

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Palladium nanoparticles were grown on sub-millimeter activated Al2O3 particle support by spraying H2PdCl4 solution evenly onto the support, followed with a thermal reduction under H2 atmosphere. Compared with its counterpart created by the conventional impregnation method, the Pd/Al2O3 catalyst created by the spray process could enrich the existence of active Pd nanoparticles on the surface of the catalyst support and increase their degree of dispersion, resulting in a much higher activity in the catalytic reduction of bromate in water. The effect of Al2O3 support particle size on the bromate removal rate was also investigated, which demonstrated that smaller support particle size could have higher activity in the catalytic reduction of bromate in water because of its larger exposed surface. This Pd/Al2O3 catalyst could be easily used in the fixed bed reactor due to its large support size and demonstrated excellent stability in the catalytic reduction of bromate in mineral water. This Pd/Al2O3 catalyst also exhibited a good catalytic reduction performance on azo dyes as demonstrated by its effective catalytic hydrogenation of methyl orange. Thus, catalysts prepared by the spray method developed in this work could have the potential to be used in fixed bed reactors for various water treatment practices.

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confidence: 99%

Creation of Pd/Al2O3 Catalyst by a Spray Process for Fixed Bed Reactors and Its Effective Removal of Aqueous Bromate

Gao

Sun

Yang

et al. 2017

Sci Rep

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“…Given the biological significance of nitrite reduction, we sought to catalytically reduce nitrite and gain a better mechanistic understanding of its reduction in our system. Examples of heterogeneous, homogeneous, and electrocatalytic iron-based systems have been reported for the reduction of nitrite. ,− Herein, we expand our previous report of stoichiometric nitrite reduction to catalytic nitrite reduction using several variants of our ligand platform. The transfer of protons from the secondary coordination sphere to the axially bound intermediates to generate water is demonstrated and mirrors biological systems.…”

Section: Introductionmentioning

confidence: 92%

Secondary Coordination Sphere Influences the Formation of Fe(III)-O or Fe(III)-OH in Nitrite Reduction: A Synthetic and Computational Study

et al. 2022

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The reduction of nitrite (NO2 –) to generate nitric oxide (NO) is a significant area of research due to their roles in the global nitrogen cycle. Here, we describe various modifications of the tris(5-cyclohexyliminopyrrol-2-ylmethyl)amine H3[N(piR)3] ligand where the steric bulk and acidity of the secondary coordination sphere were explored in the non-heme iron system for nitrite reduction. The cyclohexyl and 2,4,6-trimethylphenyl variants of the ligand were used to probe the mechanism of nitrite reduction. While previously stoichiometric addition of nitrite to the iron(II)-species generated an iron(III)-oxo complex, changing the secondary coordination sphere to mesityl resulted in an iron(III)-hydroxo complex. Subsequent addition of an electron and two protons led to the release of water and regeneration of the starting iron(II) catalyst. This sequence mirrored the proposed mechanism of nitrite reduction in biological systems, where the distal histidine residue shuttles protons to the active site. Computational studies aimed at interrogating the dissimilar behavior of the cyclohexyl and mesityl ligand systems resulting in Fe(III)-oxo and Fe(III)-hydroxo complexes, respectively, shed light on the key role of H-bonds involving the secondary coordination sphere in the relative stability of these species.

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“…To test the catalytic reduction activity of different types of catalysts for nitrate and nitrite reduction in aqueous solution, many experiments were performed in intermittent [31][32][33][34][35] and semi-intermittent reactors [36][37][38][39][40]. The main reason was that intermittent or semi-intermittent reactors have advantages such as operational flexibility, variable throughput, low investment, and quick start-up.…”

Section: Chemical Reactormentioning

confidence: 99%

Opportunities and challenges in aqueous nitrate and nitrite reduction beyond electrocatalysis

Yang

Zhou

Liang

et al. 2023

Inorg. Chem. Front.

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Catalytic reduction of nitrite in water over ceria- and ceria–zirconia-supported Pd catalysts

Cited by 23 publications

References 47 publications

Creation of Pd/Al2O3 Catalyst by a Spray Process for Fixed Bed Reactors and Its Effective Removal of Aqueous Bromate

Creation of Pd/Al2O3 Catalyst by a Spray Process for Fixed Bed Reactors and Its Effective Removal of Aqueous Bromate

Secondary Coordination Sphere Influences the Formation of Fe(III)-O or Fe(III)-OH in Nitrite Reduction: A Synthetic and Computational Study

Opportunities and challenges in aqueous nitrate and nitrite reduction beyond electrocatalysis

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