Supported Pd–Cu catalysts in the water phase reduction of nitrates: Functional resin versus alumina

Gašparovičová, Dana; Králik, Milan; Hronec, Milan; Vallušová, Zuzana; Vinek, H.; Corain, Benedetto

doi:10.1016/j.molcata.2006.08.081

Cited by 69 publications

(40 citation statements)

References 27 publications

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“…It is generally known that the kind of carrier used in the preparation of metallic supported catalysts has an influence on the dispersion of active phase [9,28,44]. The different dispersion of the metallic phase can impact on the activity and selectivity of the studied catalysts.…”

Section: Resultsmentioning

confidence: 99%

“…However, they show high activity in the reduction of nitrites [3][4][5][12][13][14]. Among the studied bimetallic systems, palladium systems promoted with Cu, Sn, Ag or Fe supported on different kinds of oxide carriers [14][15][16][17][18][19][20], polymers [21,22], zeolites [23], active carbons [24][25][26], resin [27][28][29], showed the best catalytic characteristics. The mechanism of these systems has not been explained unequivocally yet.…”

Section: Introductionmentioning

confidence: 99%

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The effect of support porosity on the selectivity of Pd–In/support catalysts in nitrate reduction

Krawczyk

Karski

Witońska

2011

Reac Kinet Mech Cat

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The influence of support porosity on the selectivity of home-made 5%Pd-2%In/support (support = SiO 2 , Al 2 O 3 , TiO 2 ) catalysts in nitrate reduction was studied. The main final products of the reaction were N 2 and NH 4? . Together with the decrease in pore diameter, an increase in ammonia concentration in the reaction mixture was observed. It is probably caused by slow diffusion of OH -ions from narrow pores to the solution.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The effect of support porosity on the selectivity of Pd–In/support catalysts in nitrate reduction

Krawczyk

Karski

Witońska

2011

Reac Kinet Mech Cat

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“…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%

“…[7]. Gašparovičová et al have reported that Cu-Pd supported on a cationic resin, Dowex 1×4, which was pretreated with NaBH 4 before the reaction, exhibits high selectivity for N 2 (94%) and that NH 3 formation is less than 0.5 ppm for the reduction of 100 ppm NO 3 - [5]. Pinter and Batista have demonstrated that NO 3 -is hydrogenated and NH 3 formation is suppressed below the allowable level for drinking using an integrated process involving Cu-Pd/Al 2 O 3 and…”

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

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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

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“…하지만 물리화학적 방법은 처리 후 잔류한 고농도의 담수 를 추가 처리해야 하고, 생물학적 방법 또한 처리수 내 공생 해있는 미생물을 재처리해야 하는 등 공정의 효율성에 대한 단점이 부각되고 있다 [8,9]. 이에 Tacke [10] [17,18]. 촉매의 담체는 알루미 나 [19], 지크로니아 [20], 활성 탄소 [21], 세리아 [22], 실리카 [10], 하이드로탈사이트 [23], 타이타니아 [24] …”

Section: 서 론unclassified

Catalytic Nitrate Reduction in Water over Nanosized TiO₂Supported Pd-Cu Catalysts

Kim¹,

Lee²

2014

Clean Technology

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주제어 : 질산성 질소 저감 반응, Nanosized TiO2, SMSI, 물 Abstract : In this study, we synthesized TiO2 supports with nanosized crystalline structure by solvothermal method and prepared TiO2 supported Pd-Cu catalysts. It was shown that the crystalline size of TiO2 support in the catalyst influenced on the catalytic activity of nitrate reduction in water. The catalyst with the smaller crystalline size of TiO2 support presented faster nitrate reduction rate, but had low nitrogen selectivity due to high pH environment of reaction medium during the reaction. Through injection of carbon dioxide as a pH buffer, the nitrogen selectivity increased by about 60%. Furthermore, we investigated that the relationships between the catalytic performance and the physicochemical properties of the prepared catalysts characterized by N2 adsoprtion-desorption, X-ray diffraction (XRD), H2-temperature programmed reduction (TPR), X-ray photoelectron spectroscopy (XPS).

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Supported Pd–Cu catalysts in the water phase reduction of nitrates: Functional resin versus alumina

Cited by 69 publications

References 27 publications

The effect of support porosity on the selectivity of Pd–In/support catalysts in nitrate reduction

The effect of support porosity on the selectivity of Pd–In/support catalysts in nitrate reduction

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

Catalytic Nitrate Reduction in Water over Nanosized TiO₂Supported Pd-Cu Catalysts

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Supported Pd–Cu catalysts in the water phase reduction of nitrates: Functional resin versus alumina

Cited by 69 publications

References 27 publications

The effect of support porosity on the selectivity of Pd–In/support catalysts in nitrate reduction

The effect of support porosity on the selectivity of Pd–In/support catalysts in nitrate reduction

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

Catalytic Nitrate Reduction in Water over Nanosized TiO2Supported Pd-Cu Catalysts

Contact Info

Product

Resources

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Catalytic Nitrate Reduction in Water over Nanosized TiO₂Supported Pd-Cu Catalysts