Nitrate reduction on the surface of bimetallic catalysts supported by nano-crystalline beta-zeolite (NBeta)

Hamid, Shanawar; Kumar, Macharla Arun; Han, Jong‐In; Lee, Woojin

doi:10.1039/c6gc02349e

Cited by 43 publications

(11 citation statements)

References 36 publications

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“…In a typical experiment, 100 mL of synthetic solution of NaNO 3 containing 100 mg/L of nitrates (

) were purged by nitrogen gas at a flow rate of 100 mL/min for 20 min prior to the test, in order to remove the excess oxygen. Aqueous solution of (0.01 mM) NaBH 4 was prepared in presence of sodium hydroxide (0.2%) and then 0.1 g of catalyst in a powder form was reduced by adding dropwise followed by vacuum-filtration [ 32 ]. The reduced catalyst was washed with Milli-Q water twice to remove residual chemicals and immediately transferred to the reactor.…”

Section: Methodsmentioning

confidence: 99%

“…The detection of the sample was achieved with a diode array detector (DAD) at 200 nm. By assuming that only negligible amounts of other intermediate products were formed (e.g.,

and

) [ 32 ], the selectivity to nitrogen (

) was calculated as follows:

where the selectivity to ammonium (

) and nitrite (

) are based on the measured

and

concentrations and calculated as follows:

and

with

the measured initial concentration and

the measured final concentration of nitrate (

). The NPs size effect on activity was evaluated by calculating TOF values for each catalyst.…”

Section: Methodsmentioning

confidence: 99%

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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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“…In a typical experiment, 100 mL of synthetic solution of NaNO 3 containing 100 mg/L of nitrates (

Section: Methodsmentioning

confidence: 99%

“…The detection of the sample was achieved with a diode array detector (DAD) at 200 nm. By assuming that only negligible amounts of other intermediate products were formed (e.g.,

and

) [ 32 ], the selectivity to nitrogen (

) was calculated as follows:

where the selectivity to ammonium (

) and nitrite (

) are based on the measured

and

concentrations and calculated as follows:

and

with

the measured initial concentration and

the measured final concentration of nitrate (

). The NPs size effect on activity was evaluated by calculating TOF values for each catalyst.…”

Section: Methodsmentioning

confidence: 99%

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

et al. 2021

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“…For example, Hamid et al developed a variety of supported Pd/Sn bimetallic catalysts, which showed good reactivity in the reduction catalysis of NO 3 – . Pd/Sn with different supports (NBeta, NZSM-5, and Red mud) all showed high kinetic rate constants and high selectivity. − Huang et al encapsulated only one Au nanoparticle below 10 nm in the TiO 2 –ZrO 2 shell to form a nanoreactor with a yolk–shell structure. During the thermal treatment or the reduction catalysis of 4-nitrophenol, the Au nanoparticles inside the mesoporous shell showed significant catalytic activity and antiaggregation properties.…”

Section: Environmental Catalytic Applicationsmentioning

confidence: 99%

Engineering Noble Metal Nanomaterials for Pollutant Decomposition

Lin

Cao

Yao

et al. 2020

Ind. Eng. Chem. Res.

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With the development of the chemical industry, more pollutants are produced in the environment, some of which are difficult to degrade by traditional biological treatment methods. Catalysis can directly degrade pollutants into products with less impact on the environment. In the past two decades, due to their unique physical and chemical properties, noble metal nanomaterials (NMNs) have been widely used as highly efficient catalysts in environmental catalysis for water and air pollutant treatment. The properties of NMNs are highly dependent on their parameters, including size, composition, and support, which can be readily used to improve the efficiency of NMNs-based catalysts. In this review, we discuss the effects of size, composition, and support on the catalytic performance of NMNs based on different environmental catalytic methods and characteristic pollutants in water and air. In addition, we focus on the mechanism of environmental catalysis and the relationship between catalytic performance and the properties of the catalysts and the chemical nature of the pollutants. We hope that this review will provide guidance for the design of NMNs-based catalysts for pollutant decomposition.

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“…Therefore, improving the selectivity of N 2 is essential for the nitrate reduction. In recent, nitrate could be high-selectively reduced to N 2 by ion exchange/catalysis integrated process and nanocrystalline materials supported bimetallic catalyst reduction process; − however, these process were relatively expensive for practical application. Thus, simplification of the denitrification process with high N 2 selectivity of nitrate reduction has many advantages in economic and efficient aspects.…”

Section: Introductionmentioning

confidence: 99%

Selective Reduction of Nitrate into Nitrogen Using Cu/Fe Bimetal Combined with Sodium Sulfite

Liu

Gong

Yang

et al. 2019

Ind. Eng. Chem. Res.

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A novel two-step reduction process was constructed to removal nitrate selectively in aqueous solution. Nitrate was preliminarily reduced into nitrite with low yield of ammonia by microscale Cu/Fe bimetal, and then the accumulated nitrite was converted into N2 by sodium sulfite. Cu was uniformly dispersed on the surface of Fe by a simple displacement reaction. Role of major iron components and fate of nitrogen species were investigated. The selectivity for N2 was over 90%, and the yield of ammonia was below 10%. In the system, accumulation of nitrite resulted from the lower reduction rate of nitrite by Fe2+ in solution and the Cu/Fe coated by oxidized iron layer compared with the generation rate of nitrite via the reduction of nitrate. The generation of ammonia was caused by the reduction of nitrate/nitrite by Fe2+ adsorbed on the surface of oxidized iron layer coated on the bimetal at low reaction rate.

show abstract

Nitrate reduction on the surface of bimetallic catalysts supported by nano-crystalline beta-zeolite (NBeta)

Abstract: A nano-crystalline beta zeolite supported bimetallic catalyst was developed and evaluated for the complete and selective reduction of nitrate to environmentally friendly nitrogen.

Cited by 43 publications

References 36 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

Engineering Noble Metal Nanomaterials for Pollutant Decomposition

Selective Reduction of Nitrate into Nitrogen Using Cu/Fe Bimetal Combined with Sodium Sulfite

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