Catalytic reduction of nitrate on Pt-Cu and Pd-Cu on active carbon using continuous reactorThe effect of copper nanoparticles

Barrabés, Noelia; Just, J.; Dafinov, A.; Medina, Francisco; Fierro, J.L.G.; Sueiras, J.E.; Salagre, Pilar; Cesteros, Yolanda

doi:10.1016/j.apcatb.2005.06.015

Cited by 163 publications

(92 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…2) is a critical problem, because the allowable level of NH 3 in drinking water is 0.5 ppm. Many studies have been carried out on the catalytic reduction of NO 3 -using bimetallic catalysts, such as Cu-Pd [3][4][5][6][7][8][9][10][11][12][13][14], Sn-Pd [15][16][17], In-Pd [9,18], and Cu-Pt [19,20], since Vorlop and coworkers discovered that Cu-Pd/Al 2 O 3 is an active and selective catalyst [3,4]. [7].…”

Section: Introductionmentioning

confidence: 99%

Remediation of actual groundwater polluted with nitrate by the catalytic reduction over copper–palladium supported on active carbon

Wang

Sakamoto

Kamiya

2009

Applied Catalysis A: General

View full text Add to dashboard Cite

Catalytic reduction of nitrate (NO 3 -) in groundwater over a Cu-Pd catalyst supported on active carbon was investigated in a gas-liquid co-current flow system at 298 K. Although CuPd/active carbon, in which the Cu/Pd molar ratio was more than 0.66, showed high activity, high selectivity for the formation of N 2 and N 2 O (98%), and high durability for the reduction of 100 ppm NO 3 -in distilled water, the catalytic performance decreased during the reduction of NO 3 -in groundwater. The catalyst also irreversibly deactivated during the reaction in groundwater. The organic species in the groundwater caused the decrease in the catalytic performance and the irreversible catalyst deactivation. Ozone-treatment of the groundwater to remove the organic species substantially helped to maintain the catalytic activity and to halt the irreversible deactivation of the catalyst. Chloride ion (Cl -) in the groundwater also caused the decrease in the activity and selectivity, but the effects of Cl -were reversible. Sulfate ion (SO 4 2-) and cations, including Mg 2+ , Ca 2+ and K + , had little or no effect on the catalytic performance of Cu-Pd/active carbon, though they were present in the groundwater sample.More than an allowable level of NH 3 (NH 4 + ) was formed during the catalytic reduction of NO 3 -in the groundwater, but was completely removed by the cation-exchange process using Namordenite.3

show abstract

Section: Introductionmentioning

confidence: 99%

Remediation of actual groundwater polluted with nitrate by the catalytic reduction over copper–palladium supported on active carbon

Wang

Sakamoto

Kamiya

2009

Applied Catalysis A: General

View full text Add to dashboard Cite

show abstract

“…These studies are mainly carried out in batch reactors and with distilled water containing only nitrates [4,[22][23][24][25]. Nevertheless, the presence of other ions in the reaction media could influence the activity and selectivity of the catalyst [26][27][28], for this reason it is important to study the activity of the bimetallic catalysts supported on different materials, but using polluted natural water that contains other ions together with the nitrates and preferably with a continuous reactor.…”

Section: Introductionmentioning

confidence: 99%

A study of different supports for the catalytic reduction of nitrates from natural water with a continuous reactor

2011

View full text Add to dashboard Cite

The aim of this work is to study the activity for the nitrate catalytic reduction in natural water, using a continuous stirred tank reactor, of Pd/Cu and Pd/Sn catalysts supported on different materials. The studied supports are: -Al 2 O 3 (commercial), active carbon, graphite, hydrotalcite and alumina synthesized in our laboratory with a high surface area. The activity and selectivity of the catalysts supported on these materials have been compared. The best results have been obtained with the Pd/Sn catalysts supported on alumina. These results show that the surface area of the support is not the only important characteristic for an active catalyst in this reaction, being also very significant its acid-base properties, its electrical conductivity and its interaction with the metallic active sites. The adequate combination of these characteristics is necessary to obtain an active catalyst. The influence of the Pd/Sn content on the activity of the alumina supported catalysts was studied, observing that the best activity was obtained when the Pd/Sn ratio was higher than 1. This result clearly indicates that it is necessary to have both Pd and Pd-Sn centers in order to obtain an active catalyst.

show abstract

“…Further, there is no sludge formation during catalytic hydrogenation. The reduction of aqueous nitrate by using hydrogen or formic acid as reducing agents over a solid catalyst offers an economically advantageous alternative process to biological treatments as a means of purifying drinking water streams and industrial effluents [5,6]. In this process, nitrates are converted via intermediates to nitrogen in a single reactor system and at near ambient conditions.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Hydrogenation of Aqueous Phase Nitrate Over Fe/C Catalysts

et al. 2009

View full text Add to dashboard Cite

Catalytic hydrogenation of nitrate in water has been carried out over Fe/C catalysts at ambient temperature using batch and continuous reactors. In batch reaction nitrate reduction activity of 2.9 mmol g metal -1 min -1 with nearly 100% selectivity towards nitrogen was obtained. Column study shows nitrate reduction below 5 ppm for an initial concentration of 100 ppm. Break through capacity, to reach concentration of 45 mg L -1 , is more than 530 bed volumes. The catalysts were characterized using XRD, SEM-EDAX and XPS. With high selectivity and activity the catalytic system in present study could be a potential option for nitrate removal from water.

show abstract

Catalytic reduction of nitrate on Pt-Cu and Pd-Cu on active carbon using continuous reactorThe effect of copper nanoparticles

Cited by 163 publications

References 30 publications

Remediation of actual groundwater polluted with nitrate by the catalytic reduction over copper–palladium supported on active carbon

Remediation of actual groundwater polluted with nitrate by the catalytic reduction over copper–palladium supported on active carbon

A study of different supports for the catalytic reduction of nitrates from natural water with a continuous reactor

Catalytic Hydrogenation of Aqueous Phase Nitrate Over Fe/C Catalysts

Contact Info

Product

Resources

About