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You searched for subject:(CHA SSZ 13). Showing records 1 – 2 of 2 total matches.

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Université de Lorraine

1. Picaud Vannereux, Simon. Étude expérimentale et simulation de procédés hybrides intégrant des membranes zéolites et polymères pour la purification d’hydrocarbures gazeux biosourcés par perméation de vapeurs : Experimental study and simulation of hybrid processes integrating zeolite and polymer membranes for the purification of bio-based gaseous hydrocarbons by vapor permeation.

Degree: Docteur es, Génie des procédés, des produits et des molécules, 2019, Université de Lorraine

Ces travaux ont porté sur l’intérêt de l’utilisation d’une membrane composite zéolite (CHA SSZ-13) accessible à l’échelle commerciale au travers de la technologie membranaire de perméation de gaz et de vapeurs. L’applicabilité de cette technologie séparative s’est principalement focalisée sur la récupération du méthane, propane et d’isobutène issus de flux produits à des échelles industrielles par des procédés durables. La mise au point d’un banc expérimental pour la mesure de données de perméation de gaz et de vapeur a été réalisé. En se basant sur des mesures expérimentales de perméation menées avec la membrane zéolite de l’étude, un premier cas d’application pratique a été de simuler les performances séparatives d’un procédé hybride associant un module membranaire zéolite avec une condensation cryogénique à partir d’un cahier des charges industriel pour la récupération d’isobutène. Le procédé hybride étudié est toujours plus performant que le procédé de condensation cryogénique seul de référence en termes de pureté du produit condensé obtenu et de consommation énergétique. Des cartographies ont été dressées afin de situer les performances de séparation simulées en fonction de l’objectif de récupération d’isobutène souhaité. Un second cas théorique de récupération du propane à partir d’évents de purge à l’azote avec un procédé hybride de séparation cryogénique couplée à une membrane permsélective a été étudié. Une cartographie des performances de séparation membranaire relative au couple propane/diazote selon les données de la littérature ouverte actuelles a été présentée. La membrane la plus permsélective au diazote et au propane (respectivement CHA SSZ-13 et PEBAX 2533) a été sélectionné afin de simuler des procédés hybrides dont les performances séparatives ont été comparées à celles de la condensation cryogénique seule de référence. Pour de faibles teneurs en propane, il a été constaté que le procédé le plus performant (besoin énergétique et qualité du produit condensé) impliquait un module membranaire polymère de type PEBAX 2533 avec un système de mise sous vide du perméat.

This work focused on the interest of using a zeolite composite membrane (CHA SSZ-13) accessible on a commercial scale through the membrane technology of gas and vapor permeation. The applicability of this separation technology has mainly focused on the recovery of methane, propane and isobutene from fluxes produced at industrial scales by sustainable processes. The development of an experimental lab scale pilot for gas and vapor permeation data measurements is detailed. Based on experimental permeation measurements carried out with the zeolite membrane of the study, a first case of practical application was to simulate the separation performance of a hybrid process associating a zeolite membrane module with a cryogenic condensation from an industrial specification for the recovery of isobutene. The hybrid process studied is always more efficient than the only cryogenic condensation process taken as reference in terms of purity of the…

Advisors/Committee Members: Roizard, Denis (thesis director), Favre, Éric (thesis director).

Subjects/Keywords: Perméation de vapeurs; Procédé hybride; CHA SSZ-13; PEBAX 2533; Méthane; Propane; Isobutène; Vapor permeation; Hybrid process; CHA SSZ-13; PEBAX 2533; Methane; Propane; Isobutylene; 660.284 24

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Picaud Vannereux, S. (2019). Étude expérimentale et simulation de procédés hybrides intégrant des membranes zéolites et polymères pour la purification d’hydrocarbures gazeux biosourcés par perméation de vapeurs : Experimental study and simulation of hybrid processes integrating zeolite and polymer membranes for the purification of bio-based gaseous hydrocarbons by vapor permeation. (Doctoral Dissertation). Université de Lorraine. Retrieved from http://www.theses.fr/2019LORR0046

Chicago Manual of Style (16th Edition):

Picaud Vannereux, Simon. “Étude expérimentale et simulation de procédés hybrides intégrant des membranes zéolites et polymères pour la purification d’hydrocarbures gazeux biosourcés par perméation de vapeurs : Experimental study and simulation of hybrid processes integrating zeolite and polymer membranes for the purification of bio-based gaseous hydrocarbons by vapor permeation.” 2019. Doctoral Dissertation, Université de Lorraine. Accessed August 04, 2020. http://www.theses.fr/2019LORR0046.

MLA Handbook (7th Edition):

Picaud Vannereux, Simon. “Étude expérimentale et simulation de procédés hybrides intégrant des membranes zéolites et polymères pour la purification d’hydrocarbures gazeux biosourcés par perméation de vapeurs : Experimental study and simulation of hybrid processes integrating zeolite and polymer membranes for the purification of bio-based gaseous hydrocarbons by vapor permeation.” 2019. Web. 04 Aug 2020.

Vancouver:

Picaud Vannereux S. Étude expérimentale et simulation de procédés hybrides intégrant des membranes zéolites et polymères pour la purification d’hydrocarbures gazeux biosourcés par perméation de vapeurs : Experimental study and simulation of hybrid processes integrating zeolite and polymer membranes for the purification of bio-based gaseous hydrocarbons by vapor permeation. [Internet] [Doctoral dissertation]. Université de Lorraine; 2019. [cited 2020 Aug 04]. Available from: http://www.theses.fr/2019LORR0046.

Council of Science Editors:

Picaud Vannereux S. Étude expérimentale et simulation de procédés hybrides intégrant des membranes zéolites et polymères pour la purification d’hydrocarbures gazeux biosourcés par perméation de vapeurs : Experimental study and simulation of hybrid processes integrating zeolite and polymer membranes for the purification of bio-based gaseous hydrocarbons by vapor permeation. [Doctoral Dissertation]. Université de Lorraine; 2019. Available from: http://www.theses.fr/2019LORR0046


University of Notre Dame

2. Trunojoyo Anggara. First-Principles Study of NO Oxidation on Cu-exchanged SSZ-13 Zeolite Catalysts</h1>.

Degree: Chemical and Biomolecular Engineering, 2015, University of Notre Dame

NOx (x = 1,2) species are pollutants generated in oxygen rich combustion. In an increasingly more stringent emission regulations, ammonia Selective Catalytic Reduction (NH3-SCR) of NOx into N2 and H2O is the leading technology in diesel and stationary sources. However, the active sites and reaction mechanism of the commercially used Cu-exchanged zeolite SCR catalyst, i.e. Cu-SSZ-13, are still being investigated. Past research has shown that the presence of NO2 through catalytic oxidation of NO to NO2: NO + ½ O2 → NO2 is known to affect NH3-SCR reaction mechanism and activity. Hence, we began our study by modeling the NO oxidation reaction on Cu-SSZ-13 using hybrid first-principles calculations to model two different active sites: single and dimeric Cu. We first examine the position and redox capability of single and dimeric Cu species using first-principles thermodynamics. Cu prefers to be charge compensated by two Al in the zeolite near the 6-Ring as isolated Cu(II) and stays as Cu(II) in the presence of O2 and H2O. Cu pairs prefer to be in the 8-Ring and stay as Cu(II). On the other hand, Cu in the 6- or the 8-Ring can undergo redox when charge compensated by one Al. This analysis frame the discussion of site activities, variation of Si/Al ratio, Cu loadings, and reaction conditions in the zeolites. NH3-SCR reactions occurs on isolated Cu charge compensated by two Al. During the redox cycle, Cu exists in both reduced Cu(I) and oxidized Cu(II) form, and oxidation of NO on a reduced Cu(I) is one of the key step in the mechanism. Our first-principles thermodynamic analysis on Cu(I) has identified NO3 as the most stable species under NO oxidation conditions (10% O2, 300 ppm NO, 150 ppm NO2 and 543 K). Further studies on the formation of NO3 is recommended for future work. We identify the molecular adsorption and subsequent activation of oxygen as a kinetically relevant step during dry NO oxidation catalysis. This can be written as: + O2 → O2 + NO → O + NO2 + NO → + 2 NO2 where denotes the active sites for catalytic dry NO oxidation. On both isolated Cu sites, molecular adsorption of oxygen are not highly favored under dry NO oxidation conditions (10% O2, 300 ppm NO, 150 ppm NO2 and 543 K). We show CuxOy species in the 8 member ring of SSZ-13 as a more facile redox site for the dry oxidation of NO, consistent with experimental observations. Dry NO oxidation, being selective to only CuxOy species in Cu-SSZ-13, can be used as a probe reaction to identify clustering of Cu ions. Further molecular investigation on paired Cu sites is recommended for future work. Finally, applying this model to other… Advisors/Committee Members: William F. Schneider, Committee Chair.

Subjects/Keywords: NOx; NO; DFT; CHA; computation; SSZ-13; after treatment; NO oxidation; zeolite; ab-initio; emission

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Anggara, T. (2015). First-Principles Study of NO Oxidation on Cu-exchanged SSZ-13 Zeolite Catalysts</h1>. (Thesis). University of Notre Dame. Retrieved from https://curate.nd.edu/show/0z708w34k4w

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Anggara, Trunojoyo. “First-Principles Study of NO Oxidation on Cu-exchanged SSZ-13 Zeolite Catalysts</h1>.” 2015. Thesis, University of Notre Dame. Accessed August 04, 2020. https://curate.nd.edu/show/0z708w34k4w.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Anggara, Trunojoyo. “First-Principles Study of NO Oxidation on Cu-exchanged SSZ-13 Zeolite Catalysts</h1>.” 2015. Web. 04 Aug 2020.

Vancouver:

Anggara T. First-Principles Study of NO Oxidation on Cu-exchanged SSZ-13 Zeolite Catalysts</h1>. [Internet] [Thesis]. University of Notre Dame; 2015. [cited 2020 Aug 04]. Available from: https://curate.nd.edu/show/0z708w34k4w.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Anggara T. First-Principles Study of NO Oxidation on Cu-exchanged SSZ-13 Zeolite Catalysts</h1>. [Thesis]. University of Notre Dame; 2015. Available from: https://curate.nd.edu/show/0z708w34k4w

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

.