Modified Fly Ash: An Eco-Friendly, Cost-Free, and Efficient Iron-Based Catalyst for Ammonia Decomposition to COx-Free Hydrogen

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dc.authoridSEKIZKARDES, BUSRA/0000-0002-7460-9834
dc.authoridKurtoglu Oztulum, Samira Fatma/0000-0001-9136-6988
dc.contributor.authorSekizkardes, Busra
dc.contributor.authorKurtoglu-Oztulum, Samira F.
dc.date.accessioned2025-02-20T08:42:25Z
dc.date.available2025-02-20T08:42:25Z
dc.date.issued2024
dc.departmentTürk-Alman Üniversitesien_US
dc.description.abstractFly ash (FA), an industrial waste produced in large amounts, is rich in metal oxides such as Al2O3, SiO2, and Fe2O3, making it an ideal candidate for use as a catalyst in ammonia decomposition. However, FA's surface area is very low (<1.0 m(2) g(-1)), limiting its potential. This study investigates the modification of FA by calcination at various temperatures (550, 700, and 1000 degrees C), HCl treatment, and HCl treatment followed by calcination at 500 degrees C to convert FA into a catalyst by utilizing its iron content as active sites. The catalyst obtained by treating FA with HCl at 220 degrees C, calcining at 500 degrees C, reducing in H-2 at 700 degrees C, and activating in ammonia at 700 degrees C achieved 86.0% ammonia conversion at a reaction temperature of 700 degrees C and a space velocity of 30,000 mL NH3 h(-1) gcat(-1), remaining stable for 140 h following an induction period of 30 h. Enhanced textural properties (18.5 m(2) g(-1)), elimination of S and Cl impurities, and the formation of relatively small Fe crystallites (23.8 nm determined by Scherrer equation and 24.0 nm measured by transmission electron microscopy (TEM)) when reduced in H-2 were responsible for this performance.
dc.description.sponsorshipKo University Nanofabrication and Nanocharacterization Center for Scientific and Technological Advanced Research (n2STAR); University Surface Science and Technology Center (KUYTAM); Ko University Tprascedil; Energy Center (KUTEM)
dc.description.sponsorshipThe authors sincerely thank Prof. Alper Uzun from Koc University for his mentorship and support. Special thanks to Assoc. Prof. U & gbreve;ur Unal from Koc University for his support in obtaining TEM images. Koc University Nanofabrication and Nanocharacterization Center for Scientific and Technological Advanced Research (n2STAR) is acknowledged for the use of TEM. Dr. Bar & imath;& scedil; Ya & gbreve;c & imath; from Koc University Surface Science and Technology Center (KUYTAM) is gratefully acknowledged for providing help with SEM/EDX and XPS measurements. This work is supported by Koc University Tupra & scedil; Energy Center (KUTEM). The authors also thank Tuncbilek Power Plant in Kutahya, Turkiye for providing FA.
dc.identifier.doi10.1002/cctc.202401666
dc.identifier.issn1867-3880
dc.identifier.issn1867-3899
dc.identifier.scopus2-s2.0-85213564307
dc.identifier.scopusqualityQ1
dc.identifier.urihttps://doi.org/10.1002/cctc.202401666
dc.identifier.urihttps://hdl.handle.net/20.500.12846/1674
dc.identifier.wosWOS:001385525400001
dc.identifier.wosqualityQ2
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherWiley-V C H Verlag Gmbh
dc.relation.ispartofChemcatchem
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_WOS_20250220
dc.subjectAcid modificationen_US
dc.subjectAmmonia decompositionen_US
dc.subjectCatalysisen_US
dc.subjectFly ashen_US
dc.subjectHydrogenen_US
dc.titleModified Fly Ash: An Eco-Friendly, Cost-Free, and Efficient Iron-Based Catalyst for Ammonia Decomposition to COx-Free Hydrogen
dc.typeArticle

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