Trade-off between NOx storage capacity and sulfur tolerance on Al2O3/ZrO2/TiO2–based DeNOx catalysts

Simple item page
buir.contributor.authorSay, Zafer
buir.contributor.authorKurt, Merve
buir.contributor.authorÖzensoy, Emrah
dc.citation.epage164en_US
dc.citation.spage152en_US
dc.citation.volumeNumber320en_US
dc.contributor.authorSay, Zaferen_US
dc.contributor.authorMihai, O.en_US
dc.contributor.authorKurt, Merveen_US
dc.contributor.authorOlsson, L.en_US
dc.contributor.authorÖzensoy, Emrahen_US
dc.date.accessioned2020-01-28T06:18:31Z
dc.date.available2020-01-28T06:18:31Z
dc.date.issued2019
dc.departmentDepartment of Chemistryen_US
dc.departmentInstitute of Materials Science and Nanotechnology (UNAM)en_US
dc.description.abstractAl2O3/ZrO2/TiO2 (AZT) ternary mixed oxides functionalized with Pt and BaO were synthesized in powder and monolithic forms and were utilized in NOx Storage Reduction/Lean NOx Trap (NSR/LNT) catalysis as novel catalytic materials. Adsorption of NOx and SOx species and their interactions with the catalyst surfaces were systematically investigated via in-situ FTIR technique revealing different NOx coordination geometries governed by the presence and the loading of BaO in the powder catalyst formulation. While BaO-free Pt/AZT stored NOx as surface nitrates, BaO incorporation also led to the formation of bulk-like ionic nitrate species. NOx adsorption results obtained from the current Temperature Programmed Desorption (TPD) data indicated that NOx Storage Capacity (NSC) was enhanced due to BaO incorporation into the powder catalyst and NSC was found to increase in the following order: Pt/AZT < Pt/8BaO/AZT < Pt/20BaO/Al2O3 < Pt/20BaO/AZT. Increase in the NSC with increasing BaO loading was found to be at the expense of the formation of bulk-like sulfates after SOx exposures. These bulk-like sulfates were observed to require higher temperatures for complete regeneration with H2(g). Catalytic activity results at 473 K and 573 K obtained via flow reactor tests with monolithic catalysts suggested that Pt/AZT and Pt/8BaO/AZT catalysts with stronger surface acidity also revealed higher resistance against sulfur poisoning and superior SOx regeneration in spite of their relatively lower NSC. Monolithic Pt/ 20BaO/AZT catalyst revealed superior NSC with respect to the conventional Pt/20BaO/Al2O3 benchmark catalyst at 573 K after sulfur regeneration. On the other hand, this trend was reversed at high-temperatures (i.e. 673 K). Preliminary results were presented demonstrating the enhancement of the high-temperature NSC of AZTbased materials by exploiting multiple NOx-storage components where BaO functioned as the low/mid-temperature NOx-storage domain and K2O served as the high-temperature NOx storage domain. Enhancement in the high-temperature NOx-storage in the BaO-K2O multiple storage domain systems was attributed to the formation of additional thermally stable bulk-like nitrates upon K2O incorporation.en_US
dc.description.provenanceSubmitted by Onur Emek (onur.emek@bilkent.edu.tr) on 2020-01-28T06:18:31Z No. of bitstreams: 1 Trade-off_between_NOx_storage_capacity_and_sulfur_tolerance_on_Al2O3ZrO2TiO2–based_DeNOx_catalysts.pdf: 1616409 bytes, checksum: 38b2507deab583d4685d41d251060d4a (MD5)en
dc.description.provenanceMade available in DSpace on 2020-01-28T06:18:31Z (GMT). No. of bitstreams: 1 Trade-off_between_NOx_storage_capacity_and_sulfur_tolerance_on_Al2O3ZrO2TiO2–based_DeNOx_catalysts.pdf: 1616409 bytes, checksum: 38b2507deab583d4685d41d251060d4a (MD5) Previous issue date: 2018en
dc.embargo.release2021-01-15
dc.identifier.doi10.1016/j.cattod.2018.01.028en_US
dc.identifier.issn0920-5861
dc.identifier.urihttp://hdl.handle.net/11693/52849
dc.language.isoEnglishen_US
dc.publisherElsevieren_US
dc.relation.isversionofhttps://dx.doi.org/10.1016/j.cattod.2018.01.028en_US
dc.source.titleCatalysis Todayen_US
dc.subjectDeNOxen_US
dc.subjectNOx storageen_US
dc.subjectFTIRen_US
dc.subjectTPDen_US
dc.subjectSOxen_US
dc.titleTrade-off between NOx storage capacity and sulfur tolerance on Al2O3/ZrO2/TiO2–based DeNOx catalystsen_US
dc.typeArticleen_US

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Trade-off_between_NOx_storage_capacity_and_sulfur_tolerance_on_Al2O3ZrO2TiO2–based_DeNOx_catalysts.pdf
Size:
1.54 MB
Format:
Adobe Portable Document Format
Description:
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.71 KB
Format:
Item-specific license agreed upon to submission
Description:
Download

Collections

Department of Chemistry
Institute of Materials Science and Nanotechnology (UNAM)