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dc.contributor.author Vanoy Villamil, Michael Nicolás
dc.contributor.author Apesteguia, Carlos Rodolfo
dc.contributor.author Padro, Cristina
dc.date.available 2017-08-15T13:52:05Z
dc.date.issued 2013-07
dc.identifier.citation Vanoy Villamil, Michael Nicolás; Apesteguia, Carlos Rodolfo; Padro, Cristina; Gas phase imidazole methylation on zeolites and HPA/SiO2: Study of acid site requirements and catalyst deactivation; Elsevier Inc; Microporous and Mesoporous Materials; 181; 7-2013; 54-60
dc.identifier.issn 1387-1811
dc.identifier.uri http://hdl.handle.net/11336/22421
dc.description.abstract The gas-phase alkylation of imidazole with methanol was studied at 523 K on solid acids such as HPA/SiO2 and zeolites HMCM22, HBEA, NaY, ZnY and HY. The nature, density and strength of acid sites were determined by temperature programmed desorption of NH3 coupled with infrared spectra of adsorbed pyridine. Coke formation was studied by temperature programmed oxidation technique. On all the samples, the selectivity to N-methylimidazole was greater than 98%. Catalysts presenting essentially Lewis (NaY and ZnY) or Brønsted (HPA/SiO2) acidity did not promote efficiently the methylation of imidazole and yielded less than 20% of N-methylimidazole. In contrast, on samples containing similar concentration of Lewis and Brønsted acid sites (HY, HBEA, HMCM22) the N-methylimidazole yield was between 60 % (HMCM22) and 100% (HY). All the samples deactivated during the 4 h catalytic tests and formed significant amounts of coke, between 2.3% (NaY) and 8% (ZnY). Catalytic tests performed at different contact times showed that the initial activity decay diminished with increasing imidazole conversion, suggesting that catalyst deactivation is mainly related with the presence of the reactants, methanol and/or imidazole. In order to gain insight on the catalyst deactivation mechanism, additional catalytic tests using different feed compositions were performed. They showed that the initial catalyst deactivation followed a linear correlation with the partial pressure of imidazole which indicated that the activity decay is essentially related with strong adsorption of imidazole the on surface acid sites.
dc.format application/pdf
dc.language.iso eng
dc.publisher Elsevier Inc
dc.rights info:eu-repo/semantics/openAccess
dc.rights.uri https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject IMIDAZOLE METHYLATION
dc.subject CATALYTS DEACTIVATION
dc.subject SOLID ACIDS
dc.subject DEACTIVATION MECHANISM
dc.subject N-methylimidazole
dc.subject.classification Ingeniería de Procesos Químicos
dc.subject.classification Ingeniería Química
dc.subject.classification INGENIERÍAS Y TECNOLOGÍAS
dc.title Gas phase imidazole methylation on zeolites and HPA/SiO2: Study of acid site requirements and catalyst deactivation
dc.type info:eu-repo/semantics/article
dc.type info:ar-repo/semantics/artículo
dc.type info:eu-repo/semantics/publishedVersion
dc.date.updated 2017-07-24T18:52:34Z
dc.journal.volume 181
dc.journal.pagination 54-60
dc.journal.pais Estados Unidos
dc.description.fil Fil: Vanoy Villamil, Michael Nicolás. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones En Catalisis y Petroquímica "ing. Jose Miguel Parera". Universidad Nacional del Litoral. Instituto de Investigaciones En Catalisis y Petroquímica "ing. Jose Miguel Parera"; Argentina
dc.description.fil Fil: Apesteguia, Carlos Rodolfo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones En Catalisis y Petroquímica "ing. Jose Miguel Parera". Universidad Nacional del Litoral. Instituto de Investigaciones En Catalisis y Petroquímica "ing. Jose Miguel Parera"; Argentina
dc.description.fil Fil: Padro, Cristina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Investigaciones En Catalisis y Petroquímica "ing. Jose Miguel Parera". Universidad Nacional del Litoral. Instituto de Investigaciones En Catalisis y Petroquímica "ing. Jose Miguel Parera"; Argentina
dc.journal.title Microporous and Mesoporous Materials
dc.relation.alternativeid info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.micromeso.2013.07.016
dc.relation.alternativeid info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S1387181113003521


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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)