Nitrogen Oxide Uptake and Desorption on Pd/ZSM-5 and Pd/Fe/ZSM-5

Simple item page
dc.contributor.advisorHarold, Michael P.
dc.contributor.committeeMemberEpling, William S.
dc.contributor.committeeMemberRimer, Jeffrey D.
dc.creatorKarinshak, Kyle A.
dc.date.accessioned2019-09-18T00:13:48Z
dc.date.available2019-09-18T00:13:48Z
dc.date.createdAugust 2017
dc.date.issued2017-08
dc.date.submittedAugust 2017
dc.date.updated2019-09-18T00:13:49Z
dc.description.abstractMeeting future NOx automotive emission standards necessitates a reduction in NOx emissions in low temperature exhaust encountered during vehicle startup and low load operation (< 200 °C). Pd-based zeolite catalysts are a potential solution to achieving these emission reductions through low temperature NO trapping. This Passive NOx Adsorbers (PNA) adsorbs NOx at low temperatures and release NOx at high temperatures enabling catalytic reduction with existing technologies such as selective catalytic reduction. In this thesis, NOx uptake and desorption characteristics was studied on several Pd-based ZSM-5 catalysts. The effect of Fe addition to the Pd ZSM-5 catalyst composition was also investigated. A flow reactor system equipped with a Fourier transform infrared (FTIR) spectrometry was used to investigate the uptake and release performance features of ZSM5, Pd(1%)/ZSM-5, Pd(2%)/ZSM-5, and Pd(1%)Fe(1%)/ZSM-5 catalysts over a range of uptake temperatures and flow rates. Diffuse reflectance infrared Fourier transform spectrometry (DRIFTS) experiments were conducted to identify key surface species over a range of conditions. NOx was found to adsorb on both Pd2+ complexes and zeolitic acid sites. The addition of Fe resulted in better Pd dispersion and better NOx storage. Catalysts stored over half of all NOx introduced, but NOx stored on zeolitic acid sites desorbed at lower-than-ideal temperatures. The presence of H2O severely reduced NO uptake. Potential mechanisms are described that are consistent with the flow reactor and DRIFTS experiments.
dc.description.departmentChemical and Biomolecular Engineering, Department of
dc.format.digitalOriginborn digital
dc.format.mimetypeapplication/pdf
dc.identifier.urihttps://hdl.handle.net/10657/4770
dc.language.isoeng
dc.rightsThe author of this work is the copyright owner. UH Libraries and the Texas Digital Library have their permission to store and provide access to this work. Further transmission, reproduction, or presentation of this work is prohibited except with permission of the author(s).
dc.subjectPNA
dc.subjectNO
dc.subjectPd/ZSM-5
dc.titleNitrogen Oxide Uptake and Desorption on Pd/ZSM-5 and Pd/Fe/ZSM-5
dc.type.dcmiText
dc.type.genreThesis
thesis.degree.collegeCullen College of Engineering
thesis.degree.departmentChemical and Biomolecular Engineering, Department of
thesis.degree.disciplineChemical Engineering
thesis.degree.grantorUniversity of Houston
thesis.degree.levelMasters
thesis.degree.nameMaster of Science

Files

Original bundle

Now showing 1 - 1 of 1
Thumbnail Image
Name:
KARINSHAK-THESIS-2017.pdf
Size:
5.5 MB
Format:
Adobe Portable Document Format
Download

License bundle

Now showing 1 - 2 of 2
No Thumbnail Available
Name:
PROQUEST_LICENSE.txt
Size:
4.43 KB
Format:
Plain Text
Description:
Download
No Thumbnail Available
Name:
LICENSE.txt
Size:
1.81 KB
Format:
Plain Text
Description:
Download

Collections

Published ETD Collection