Show simple item record

dc.contributor.authorKhan, Hassnain Abbas
dc.contributor.authorHao, Junyu
dc.contributor.authorFarooq, Aamir
dc.date.accessioned2020-06-01T07:27:51Z
dc.date.available2020-06-01T07:27:51Z
dc.date.issued2020-05-15
dc.date.submitted2020-03-26
dc.identifier.citationKhan, H. A., Hao, J., & Farooq, A. (2020). Catalytic performance of Pd catalyst supported on Zr:Ce modified mesoporous silica for methane oxidation. Chemical Engineering Journal, 397, 125489. doi:10.1016/j.cej.2020.125489
dc.identifier.issn1385-8947
dc.identifier.doi10.1016/j.cej.2020.125489
dc.identifier.urihttp://hdl.handle.net/10754/662942
dc.description.abstractCatalytic oxidation of methane is critical for exhaust after-treatment systems where cold-start emissions and lean combustion still pose serious challenges. In this work, the effect of support materials on the complete catalytic oxidation of methane over palladium is studied in dry and wet conditions. A series of metal oxides (CeO2, ZrO2, n-SiO2) and mixed metal oxides (Zr0.65Ce0.35O2, Zr0.33Ce0.33/n-Si0.33O2, Zr0.66Ce0.17/n-Si0.17O2) supported Pd catalysts were synthesized, characterized and tested for methane oxidation. Pd/n-SiO2 was found to be highly active catalyst with the lowest initial (T10%) and final (T100%) conversion temperatures as compared to Pd supported on CeO2 and ZrO2. Methane combustion over mixed oxide supports, prepared with different ratios of Zr:Ce:Si, showed improved catalytic performance. Catalyst with equal ratios of Zr:Ce:Si (Pd/Zr0.33Ce0.33/n-Si0.33O2) showed similar performance to that of Pd/n-SiO2 with approximately ~8 (±2) °C higher light-off temperature. Additionally, cyclic wet (8 vol% H2O) and dry reactions were performed to evaluate the hydrothermal stability and activity regeneration when switching from wet to dry conditions. Optimal addition of ZrO2 and CeO2 to n-SiO2 resulted in higher stability of palladium catalyst over wide ranges of temperatures (350–600 °C). Catalysts were characterized by various analytical techniques, including TEM, XRD, XRF, N2-BET, O2-TPD, and CO chemisorption. TEM results demonstrate that mixed oxide support stabilized Pd nanoparticles, and n-SiO2 encapsulation prevented sintering and deactivation. Activity tests and characterization results demonstrate overall superior catalytic properties of Pd supported on Zr0.33Ce0.33/n-Si0.33O2. This catalyst can be quite promising for practical applications due to its high activity for total methane oxidation and excellent thermal stability.
dc.description.sponsorshipResearch reported in this work was funded by the Office of Sponsored Research at King Abdullah University of Science and Technology (KAUST) under the Competitive Research Grant # CRG-3402.
dc.publisherElsevier BV
dc.relation.urlhttps://linkinghub.elsevier.com/retrieve/pii/S138589472031617X
dc.rightsNOTICE: this is the author’s version of a work that was accepted for publication in Chemical Engineering Journal. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Chemical Engineering Journal, [397, , (2020-05-15)] DOI: 10.1016/j.cej.2020.125489 . © 2020. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.titleCatalytic performance of Pd catalyst supported on Zr:Ce modified mesoporous silica for methane oxidation
dc.typeArticle
dc.contributor.departmentChemical Kinetics & Laser Sensors Laboratory
dc.contributor.departmentClean Combustion Research Center
dc.contributor.departmentMechanical Engineering
dc.contributor.departmentMechanical Engineering Program
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.identifier.journalChemical Engineering Journal
dc.rights.embargodate2022-05-19
dc.eprint.versionPost-print
dc.identifier.volume397
dc.identifier.pages125489
kaust.personKhan, Hassnain Abbas
kaust.personHao, Junyu
kaust.personFarooq, Aamir
dc.date.accepted2020-05-17
dc.identifier.eid2-s2.0-85084756389
refterms.dateFOA2020-06-01T11:26:45Z
kaust.acknowledged.supportUnitCompetitive Research
kaust.acknowledged.supportUnitOffice of Sponsored Research
dc.date.published-online2020-05-15
dc.date.published-print2020-10


Files in this item

Thumbnail
Name:
Manuscript- marked Copy.pdf
Size:
790.8Kb
Format:
PDF
Description:
Accepted manuscript
Embargo End Date:
2022-05-19

This item appears in the following Collection(s)

Show simple item record