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  Preparation, characterization and catalytic performance of Ag-modified mesoporous TiO2 in low-temperature selective ammonia oxidation into nitrogen and water vapour

Jabłońska, M., Ciptonugroho, W., Góra-Marek, K., Al-Shaal, M. G., & Palkovits, R. (2017). Preparation, characterization and catalytic performance of Ag-modified mesoporous TiO2 in low-temperature selective ammonia oxidation into nitrogen and water vapour. Microporous and Mesoporous Materials, 245, 31-44. doi:10.1016/j.micromeso.2017.02.070.

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 Creators:
Jabłońska, Magdalena1, Author
Ciptonugroho, Wirawan1, Author
Góra-Marek, Kinga2, Author
Al-Shaal, Mohammad Ghith3, Author              
Palkovits, Regina1, Author
Affiliations:
1Institut für Technische und Makromolekulare Chemie, Chair of Heterogeneous Catalysis and Chemical Technology, RWTH Aachen University, Worringerweg 2, 52074 Aachen, Germany, ou_persistent22              
2Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Kraków, Poland, ou_persistent22              
3Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445589              

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Free keywords: Mesoporous titania; Evaporation induced self-assembly, Silver; Selective ammonia oxidation
 Abstract: Mesoporous TiO2 was prepared by evaporation induced self-assembly (EISA) and used as a support for silver with loadings of 1.5 or 10 wt%, respectively. Silver deposited on commercial TiO2 (anatase) and γ-Al2O3 served as reference catalysts. The mesoporous TiO2 were calcined at 500, 600, 700 and 800 °C in order to obtain anatase and/or rutile phases. The materials were characterized with respect to structural (XRD, TEM, UV-vis-DRS) and textural parameters (N2 adsorption-desorption), acidic properties (NH3-TPD, FTIR studies), redox properties (H2-TPR), and were applied as catalysts for the selective ammonia oxidation into nitrogen and water vapour (NH3-SCO). The catalytic performance (activity and N2 selectivity) was favoured over (1.5 wt%)Ag-doped mesoporous TiO2 calcined at 600 °C. Thus, mesoporous TiO2 with the predominant anatase phase, as a support guaranteed the formation of easily reducible highly dispersed oxidized silver species. Furthermore, these species were converted into Ag0 and possibly Agnδ+ clusters through in situ H2-pretreatment of catalysts. While mainly metallic silver catalyzed the decomposition of N2O into N2 and surface oxygen species, leading to higher N2 selectivity in NH3-SCO.

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Language(s): eng - English
 Dates: 2017-02-062017-10-272017-02-232017-02-242017-06-01
 Publication Status: Published in print
 Pages: 14
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1016/j.micromeso.2017.02.070
 Degree: -

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Title: Microporous and Mesoporous Materials
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier
Pages: - Volume / Issue: 245 Sequence Number: - Start / End Page: 31 - 44 Identifier: ISSN: 1387-1811
CoNE: https://pure.mpg.de/cone/journals/resource/954926228401