Nitrate removal in drinking waters: the effect of tin oxides in the catalytic hydrogenation of nitrate by Pd/SnO2 catalysts

Gavagnin, Roberta; Biasetto, Luca; Pinna, Francesco; Strukul, Giorgio

doi:10.1016/s0926-3373(02)00032-2

Cited by 141 publications

(103 citation statements)

References 26 publications

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“…From the literature data, it also is known that some supports like TiO 2 , CeO 2 and SnO 2 in the monometallic palladium catalysts participate in the reduction of nitrates to nitrogen [8][9][10][11]. However, in our studies, the conversion of nitrates over 5%Pd/TiO 2 was about only 3% (Table 1).…”

Section: Resultscontrasting

confidence: 50%

“…In the reduction of nitrates, maintaining constant pH [2,8,30,[45][46][47] is an important factor determining the composition of the reaction mixture. The reduction of nitrates may be schematically presented as a sequence of five reaction equations [7]:…”

Section: Resultsmentioning

confidence: 99%

“…The monometallic catalysts which were studied thoroughly are palladium systems supported on Al 2 O 3 [1,2], C [3][4][5], SnO 2 [6][7][8], CeO 2 [9], TiO 2 [10,11], and pumice [12]. Monometallic palladium catalysts are not very active in the reaction of nitrate reduction.…”

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: Resultscontrasting

confidence: 50%

Section: Resultsmentioning

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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“…As reported, bimetallic Pd-Cu, Pd-Sn or Pd-In catalysts show higher activity and selectivity for nitrate reduction [4,10,11] . Different supports, such as γ-Al 2 O 3 [12] , SiO 2 [6] , TiO 2 [10] , ZrO 2 [13] , SnO 2 [14] , and activated carbon [11] ，have an apparent influence on the capacity of the catalyst. Generally, the support having adsorptive capability for pollutant is favorable for improving catalytic property of catalyst.…”

mentioning

confidence: 99%

Hydrotalcite-supported Pd-Cu catalyst for nitrate adsorption and reduction from water

Wang

Liu

et al. 2006

Sci. Bull.

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Hydrotalcite-supported Pd-Cu catalyst for nitrate adsorption and catalytic reduction from water is prepared by co-impregnation method and characterized by surface area (BET), X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM) and X-ray photoelectron spectrum (XPS). The performance of adsorption and hydrogenation of nitrate was evaluated and compared with Al 2 O 3 , TiO 2 , and HZSM-supported Pd-Cu catalysts. The experimental results demonstrated that hydrotalcite-supported Pd-Cu catalyst exhibited a high surface area (185.3 m 2 /g) and mesopore structure (average pore diameter of 52.2 Å). The active metal clusters were homogeneously dispersed on the support, and the size of the most was less than 10 nm. Excellent adsorption for nitrate resulted from that nitrate ions were forced to enter the interlayer space when the calcined hydrotalcite regenerated layer structure in nitrate solution. The adsorption isotherm could be well described by the Langmuir model. The comparison between the adsorption and catalytic hydrogenation for nitrate using hydrogen indicated that nitrate reduction on hydrotalcite-supported Pd-Cu catalysts was a consecutive and dynamic adsorption and catalytic hydrogenation process. Compared with the Al 2 O 3 , TiO 2 , and HZSMsupported catalysts, hydrotalcite-supported Pd-Cu catalyst possessed higher catalytic activity and selectivity. The analysis on the dissolving of metals in the solution demonstrated that there was hydrolyzation on the surface of the hydrotalcite-supported Pd-Cu catalyst. However, the concentrations of dissolved metals in the solution were lower than the standard executed in China. The activity of the hydrotalcite-supported Pd-Cu catalyst for nitrate reduction kept steady after repeated use.

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“…Además de influir sobre la actividad del catalizador, el aumento del pH se ha descrito que también afecta a la selectividad del mismo, aumentando la selectividad del catalizador a amonio [74].…”

Section: Variables De Reacciónunclassified

Eliminación Catalítica De Nitratos en Continuo en Aguas Naturales

Martí¹

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ELIMINACIÓN CATALÍTICA DE NITRATOS EN CONTINUO EN AGUAS NATURALESTESIS Agradecimientos/AgraïmentsEn estes línees vull agrair tot el suport que m'han donat totes les persones que han estat al meu costat en estos sis anys que estic al ITQ.En primer lloc vull donar les gràcies al Prof. Avelino Corma per haver-me donat l'oportunitat de realitzar la tesi al seu Institut, per espentar-me a fer-la i per estar sempre disponible per a donar idees científiques o per a donar suport moral.Per suposat vull agrair al meu director de tesi, el Dr. Eduardo Palomares, per ensenyar-me tantes coses, per ser un bon jefe, un bon professor i millor persona, per deixar-me fer i desfer en tot lo que he volgut i per la seua ajuda i dedicació.Agradecer a los participantes del proyecto MONACAT su inestimable ayuda y su dedicación durante todo el proyecto.Gracias al personal investigador por tener siempre las puertas abiertas, en especial a Urbano por enseñarme tantas cosas acerca de las zeolitas, por su paciencia y sus consejos, y a Fernando por darme la oportunidad de trabajar en el sincrotrón.También quiero dar las gracias a la gente de administración, taller e informática (en especial a Javi H.), por las horas que han perdido conmigo y por su paciencia. A Mª Amparo por tantas conversaciones. A la gente de la planta baja, no sólo por sus tareas de caracterización que tanta falta nos hacen, si no por compartir los primer años aquí en el ITQ, en especial a Adelina, Fani y Chusa por tantas risas.Quiero agradecer a Mª Jesús su grata compañía en mi "estancia" en la biblioteca y a Mª Ángeles que siempre tiene algo que decir para sacarme una sonrisa, gracias también por tus consejos.A mis compañeros de NO x : a José Prato (por tu biblia), a Álvaro (por tu amistad), a Neus, Pablo, Andrea, Javi y Ada por tener tanta paciencia conmigo en estos últimos meses, por quitarme faena para que pudiera escribir, por enseñarme a enseñar (he intentado hacerlo lo mejor posible) y por tantas risas. Y a los que compartieron poquito tiempo conmigo: María, Mari Carmen, Eli y Andrés. A todos, muchas gracias.També agrair a la gent de la primera planta amb qui he compartit tants moments: Estefanía, Chelo, Pablo, Carmen, Pedro A. (gracias por tu inestimable ayuda con la conductividad) i Vicente Vert (¡podemos!).Agradecer a toda la gente de síntesis con los que compartí unos meses: Manu, Vicent, Tomás, Raquel S. y por supuesto a Raquel P. (per estar tan loqueta i alegrar-nos els dies al ITQ).Gracias a todos los de reacción por hacerme un sitio entre vosotros: Rut (la broncas), Víctor (el cantaor), Yannick (el franchute), Eva Briz (la dulce), Noemí, Cristina I., Javi, Salva, Roberto, Eva, Olga, Susi, María, Fran, Segundo, Diego y por supuesto a Tere P. y a Amada, mis compañeras de reacción 4.Moltes gràcies a Esther per fer del laboratori ECO el millor del món, a Aroa per tots els consells i per sempre estar ahí, a les Isabels per tantes converses compartides, al meu Manolo per ser el millor, per escoltar-me i aconsellar-me i a la seua Ceci per ser tan dolça, a Ángel pe...

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Nitrate removal in drinking waters: the effect of tin oxides in the catalytic hydrogenation of nitrate by Pd/SnO2 catalysts

Cited by 141 publications

References 26 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

Hydrotalcite-supported Pd-Cu catalyst for nitrate adsorption and reduction from water

Eliminación Catalítica De Nitratos en Continuo en Aguas Naturales

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