Document
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Topics in Catalysis
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type: Periodical
type: Continuant
publication venue for: Combined thermometric analysis of a series of highly dealuminated USY zeolites
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RDF description of Combined thermometric analysis of a series of highly dealuminated USY zeolites - http://orbis.uaslp.mx/vivo/individual/scopus1145
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date: 2026-08-25T01:05:05
publisher: vivo
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Article
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Combined thermometric analysis of a series of highly dealuminated USY zeolites
issue: 3-4
most specific type: Article
freetext keyword: Adsorption model; Ammonia; Dealuminated faujasite; Microcalorimetry; TPD; USY Adsorption; Ammonia; Calorimeters; Desorption; Temperature programmed desorption; Zeolites; Adsorption model; Adsorption strength; Ammonia adsorption; Continuous distribution; Dealuminated HY zeolites; Faujasites; Micro-calorimetry; USY; Gas adsorption
page start: 249
most specific type: Document
date time value: article date 1146
type: Information Content Entity
e iscopus: 2-s2.0-0000369061
related by: authorship 6734
type: Generically Dependent Continuant
type: Entity
volume: 19
type: Document
has publication venue: Topics in Catalysis
type: Thing
abstract: A transient reactor model was used to consolidate and quantify the data of ammonia adsorption microcalorimetry and single ammonia TPD runs, using several members of the commercial CBV series of dealuminated HY zeolites. The model accounts for the competitive re-adsorption of molecules desorbing from multiple sites, using the microcalorimetric data to constrain the desorption energy parameters to physically meaningful values. All TPD profiles were well represented by models consisting of only two or three distinct site types, even though the differential heat plots imply a continuous distribution of sites in the 160-80 kJ/mol range for all catalysts. Increasing dealumination severity is evidenced by a decrease in total site density for sites 100 kJ/mol. While there was no evidence of an enhancement of adsorption strength within the series studied, the range of site strengths available remained the same. There is correspondence between the density of adsites = 100 kJ/mol and the framework Al3%2b concentration, although the ratio of these is less than one, even for Si/Al80. The inherent limits in using ammonia adsorption as an acidity probe are briefly mentioned. © 2002 Plenum Publishing Corporation.
related by: authorship 6739
related by: authorship 6736
abstract: A transient reactor model was used to consolidate and quantify the data of ammonia adsorption microcalorimetry and single ammonia TPD runs, using several members of the commercial CBV series of dealuminated HY zeolites. The model accounts for the competitive re-adsorption of molecules desorbing from multiple sites, using the microcalorimetric data to constrain the desorption energy parameters to physically meaningful values. All TPD profiles were well represented by models consisting of only two or three distinct site types, even though the differential heat plots imply a continuous distribution of sites in the 160-80 kJ/mol range for all catalysts. Increasing dealumination severity is evidenced by a decrease in total site density for sites 100 kJ/mol. While there was no evidence of an enhancement of adsorption strength within the series studied, the range of site strengths available remained the same. There is correspondence between the density of adsites = 100 kJ/mol and the framework Al3 concentration, although the ratio of these is less than one, even for Si/Al80. The inherent limits in using ammonia adsorption as an acidity probe are briefly mentioned. © 2002 Plenum Publishing Corporation.
type: Article
origen: scopus
related by: authorship 6738
type: Continuant
related by: authorship 6740
related by: authorship 6735
page end: 258
crisid: 1146
related by: authorship 6737
estado: published

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