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

Jabłońska, Magdalena; Ciptonugroho, Wirawan; Góra-Marek, Kinga; Al-Shaal, Mohammad Ghith; Palkovits, Regina

doi:10.1016/j.micromeso.2017.02.070

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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

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Al-Shaal, Mohammad Ghith
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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引用

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.

引用: https://hdl.handle.net/21.11116/0000-0001-01F1-D

要旨

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 Ag_n^δ+ 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.