Number of the records: 1
Oxygen effect in NO direct decomposition over K/Co-Mg-Mn-Al mixed oxide catalyst–Temperature programmed desorption study.
- 1.
SYSNO ASEP 0543504 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Oxygen effect in NO direct decomposition over K/Co-Mg-Mn-Al mixed oxide catalyst–Temperature programmed desorption study. Author(s) Pacultová, K. (CZ)
Klegová, A. (CZ)
Karásková, K. (CZ)
Fridrichová, D. (CZ)
Bílková, T. (CZ)
Koštejn, Martin (UCHP-M) RID, SAI, ORCID
Obalová, L. (CZ)Article number 111695 Source Title Molecular Catalysis. - : Elsevier - ISSN 2468-8231
Roč. 510, JUN 2021 (2021)Number of pages 16 s. Language eng - English Country NL - Netherlands Keywords mechanism ; mixed oxide ; oxygen effect ; NO Subject RIV CI - Industrial Chemistry, Chemical Engineering OECD category Chemical process engineering R&D Projects GA18-19519S GA ČR - Czech Science Foundation (CSF) Method of publishing Open access with time embargo (01.07.2023) Institutional support UCHP-M - RVO:67985858 UT WOS 000713699300002 EID SCOPUS 85108300444 DOI 10.1016/j.mcat.2021.111695 Annotation Co-Mg-Mn-Al mixed oxide with or without K was prepared and characterized by XPS, TPR H2, TPD NO, TPD O2 and TPD NO+O2. NO decomposition was performed over catalyst activated in different atmosphere (N2, He, O2). Presence of oxygen during activation changed the course of surface stabilization but did not affect NO conversion achieved at steady state. O2 desorbed as a reaction product does not affect the reaction rate for NO inlet concentration of 400 - 8000 ppm, but presence of O2 in inlet gas mixture (0.05 - 3 mol.%) has significant inhibiting effect. Transition metals in octahedral coordination represent sites for NO chemisorption, while potassium ensures NO oxidation to surface nitrites, which are indispensable reactive species. Oxygen desorption was the slowest reaction step, while N2 desorption was fast. Oxygen inhibition was ascribed to oxidation of NO* species on the octahedral Co3+ and Mn3+ to more stable surface nitrates making NO* species as limiting reactant. Workplace Institute of Chemical Process Fundamentals Contact Eva Jirsová, jirsova@icpf.cas.cz, Tel.: 220 390 227 Year of Publishing 2022 Electronic address http://hdl.handle.net/11104/0320699
Number of the records: 1