Influence of Chemical Surface Characteristics of Ammonium-Modified Chilean Zeolite on Oak Catalytic Pyrolysis

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dc.contributor.authorAlejandro-Martin, Serguei
dc.contributor.authorMontecinos Acaricia, Actin
dc.contributor.authorCerda-Barrera, Cristian
dc.contributor.authorDiaz Perez, Hatier
dc.date2019
dc.date.accessioned2021-04-30T16:31:18Z
dc.date.available2021-04-30T16:31:18Z
dc.description.abstractThe influence of chemical surface characteristics of Chilean natural and modified zeolites on Chilean Oak catalytic pyrolysis was investigated in this study. Chilean zeolite samples were characterised by nitrogen absorption at 77 K, X-ray powder diffraction (XRD), and X-ray fluorescence (XRF). The nature and strength of zeolite acid sites were studied by diffuse reflectance infrared Fourier transform (DRIFT), using pyridine as a probe molecule. Experimental pyrolysis was conducted in a quartz cylindrical reactor and bio-oils were obtained by condensation of vapours in a closed container. Chemical species in bio-oil samples were identified by a gas chromatography/mass spectrophotometry (GC/MS) analytical procedure. Results indicate that after the ionic exchange treatment, an increase of the BrOnsted acid site density and strength was observed in ammonium-modified zeolites. BrOnsted acids sites were associated with an increment of the composition of ketones, aldehydes, and hydrocarbons and to a decrease in the composition of the following families (esters; ethers; and acids) in obtained bio-oil samples. The BrOnsted acid sites on ammonium-modified zeolite samples are responsible for the upgraded bio-oil and value-added chemicals, obtained in this research. Bio-oil chemical composition was modified when the pyrolysis-derived compounds were upgraded over a 2NHZ zeolite sample, leading to a lower quantity of oxygenated compounds and a higher composition of value-added chemicals.
dc.identifier.citationCATALYSTS,Vol.9,,2019
dc.identifier.doi10.3390/catal9050465
dc.identifier.urihttp://repositoriodigital.uct.cl/handle/10925/2880
dc.language.isoen
dc.publisherMDPI
dc.sourceCATALYSTS
dc.subject.englishchilean natural zeolite
dc.subject.englishBrOnsted acid sites
dc.subject.englishbio-oil upgrade
dc.subject.englishcatalytic pyrolysis
dc.titleInfluence of Chemical Surface Characteristics of Ammonium-Modified Chilean Zeolite on Oak Catalytic Pyrolysis
dc.typeArticle
uct.catalogadorWOS
uct.indizacionSCI
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