Environmental application of natural microporous aluminosilicates: NO<SUB>x</SUB> reduction by propane over modified clinoptilolite zeolite

Synthetic exchanged zeolites have proved to be active catalysts for the selective catalytic reduction (SCR) NOx by hydrocarbons as reductors in the presence of O2. The abundance and potentiality of argentine zeolite mineral resources encouraged us to analyze the possibitity of taking advantage of th...

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Autores principales: Botto, Irma Lía, Canafoglia, María Elena, Lick, Ileana Daniela, Cabello, Carmen Inés, Schalamuk, Isidoro Bernardo Abel, Minelli, G., Ferraris, G.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2004
Materias:
Química
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/164024
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SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-164024
record_format dspace
spelling I19-R120-10915-1640242024-03-19T20:09:48Z http://sedici.unlp.edu.ar/handle/10915/164024 Environmental application of natural microporous aluminosilicates: NO<SUB>x</SUB> reduction by propane over modified clinoptilolite zeolite Botto, Irma Lía Canafoglia, María Elena Lick, Ileana Daniela Cabello, Carmen Inés Schalamuk, Isidoro Bernardo Abel Minelli, G. Ferraris, G. 2004 2024-03-19T18:31:38Z en Química Synthetic exchanged zeolites have proved to be active catalysts for the selective catalytic reduction (SCR) NOx by hydrocarbons as reductors in the presence of O2. The abundance and potentiality of argentine zeolite mineral resources encouraged us to analyze the possibitity of taking advantage of these minerals as starting materials for catalyts preparation. In this sense, clinoptilolite-rich tuffaceous material was selected. Clinoptilolite (named CLI), belonging to the heulandite–type zeolite (HEU), was treated with Co(II) and Co(II)-Rh(III) solutions to obtain the monometallic and bimetallic zeolite systems, precursors of the catalysts. The mineral, the precursors and the catalysts were characterized by means of several techniques such as XRD, XRF, FTIR and DRS spectroscopies, thermal studies (DTGA, TPR), SEM-EDAX microscopy and textural analysis. The steps of the chemical treatment were carried out, in part, in solution, involving the mineral transformation into the NH4-CLI, Co(II)-CLI and Co-Rh-CLI precursor phases. Catalysts were obtained by thermal treatment at 500ºC. TPR measurements provided information about the interactions and characteristics of the active metals with the aluminosilicate framework of the catalysts. Two types of catalysts were evaluated for the NOx reduction reaction using propane in O2 presence: 0.5%(w/w)Co-CLI and 0.25%(w/w)Rh—0.5%(w/w)Co-CLI respectively. The performance of catalysts obtained from natural zeolites revealed that they were active for the reaction, despite the very low metallic content. Las zeolitas sintéticas intercambiadas con metales han demostrado ser activos catalizadores para la reducción catalítica selectiva (SCR) de óxidos de nitrógeno (NOx) mediante el uso de hidrocarburos como reductores, en presencia de O2. La abundancia y potencialidad de los recursos naturales argentinos en zeolitas, nos impulsó a analizar la posibilidad de aprovechamiento de esos minerales para su uso como materiales de partida en la preparación de catalizadores. En tal sentido, se seleccionó material tobáceo, rico en clinoptilolita. La clinoptilolita (denominada CLI) fue tratada con soluciones de Co(II) y de Co(II)-Rh(III) para obtener sistemas zeolíticos mono- y bimetálicos, precursores de los catalizadores. El mineral, los precursores y los catalizadores fueron caracterizados mediante distintas técnicas, tales como XRD, XRF, espectroscopías FTIR y de reflectancia difusa, estudios térmicos (DTGA, TPR), microscopía electrónica de barrido (SEM-EDAX) y análisis texturales. Las etapas del proceso químico fueron, en parte, en solución acuosa, implicando la transformación del mineral en las fases precursoras NH4-CLI, Co-CLI y Rh-Co-CLI. Los catalizadores fueron obtenidos por tratamiento térmico a 500ºC. Las medidas de TPR permitieron obtener información acerca de la interacción y características del metal activo en el esqueleto aluminosilícico de los catalizadores. Se evaluaron dos tipos de catalizadores para la reacción de reducción de NOx a N2 mediante el empleo de propano, en presencia de O2 : 0,5 % (en peso) Co-CLI y 0,25 % (en peso) Rh- 0,5 % Co-CLI. El comportamiento de los catalizadores obtenidos a partir de zeolita natural reveló que ellos son activos para la reacción, no obstante el muy bajo contenido metálico. Centro de Química Inorgánica Centro de Investigación y Desarrollo en Ciencias Aplicadas Instituto de Recursos Minerales Articulo Articulo http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) application/pdf 139-153
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Química
spellingShingle Química
Botto, Irma Lía
Canafoglia, María Elena
Lick, Ileana Daniela
Cabello, Carmen Inés
Schalamuk, Isidoro Bernardo Abel
Minelli, G.
Ferraris, G.
Environmental application of natural microporous aluminosilicates: NO<SUB>x</SUB> reduction by propane over modified clinoptilolite zeolite
topic_facet Química
description Synthetic exchanged zeolites have proved to be active catalysts for the selective catalytic reduction (SCR) NOx by hydrocarbons as reductors in the presence of O2. The abundance and potentiality of argentine zeolite mineral resources encouraged us to analyze the possibitity of taking advantage of these minerals as starting materials for catalyts preparation. In this sense, clinoptilolite-rich tuffaceous material was selected. Clinoptilolite (named CLI), belonging to the heulandite–type zeolite (HEU), was treated with Co(II) and Co(II)-Rh(III) solutions to obtain the monometallic and bimetallic zeolite systems, precursors of the catalysts. The mineral, the precursors and the catalysts were characterized by means of several techniques such as XRD, XRF, FTIR and DRS spectroscopies, thermal studies (DTGA, TPR), SEM-EDAX microscopy and textural analysis. The steps of the chemical treatment were carried out, in part, in solution, involving the mineral transformation into the NH4-CLI, Co(II)-CLI and Co-Rh-CLI precursor phases. Catalysts were obtained by thermal treatment at 500ºC. TPR measurements provided information about the interactions and characteristics of the active metals with the aluminosilicate framework of the catalysts. Two types of catalysts were evaluated for the NOx reduction reaction using propane in O2 presence: 0.5%(w/w)Co-CLI and 0.25%(w/w)Rh—0.5%(w/w)Co-CLI respectively. The performance of catalysts obtained from natural zeolites revealed that they were active for the reaction, despite the very low metallic content.
format Articulo
Articulo
author Botto, Irma Lía
Canafoglia, María Elena
Lick, Ileana Daniela
Cabello, Carmen Inés
Schalamuk, Isidoro Bernardo Abel
Minelli, G.
Ferraris, G.
author_facet Botto, Irma Lía
Canafoglia, María Elena
Lick, Ileana Daniela
Cabello, Carmen Inés
Schalamuk, Isidoro Bernardo Abel
Minelli, G.
Ferraris, G.
author_sort Botto, Irma Lía
title Environmental application of natural microporous aluminosilicates: NO<SUB>x</SUB> reduction by propane over modified clinoptilolite zeolite
title_short Environmental application of natural microporous aluminosilicates: NO<SUB>x</SUB> reduction by propane over modified clinoptilolite zeolite
title_full Environmental application of natural microporous aluminosilicates: NO<SUB>x</SUB> reduction by propane over modified clinoptilolite zeolite
title_fullStr Environmental application of natural microporous aluminosilicates: NO<SUB>x</SUB> reduction by propane over modified clinoptilolite zeolite
title_full_unstemmed Environmental application of natural microporous aluminosilicates: NO<SUB>x</SUB> reduction by propane over modified clinoptilolite zeolite
title_sort environmental application of natural microporous aluminosilicates: no<sub>x</sub> reduction by propane over modified clinoptilolite zeolite
publishDate 2004
url http://sedici.unlp.edu.ar/handle/10915/164024
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