학술논문
In Situ H 2 Reduction of Al 2 O 3 -Supported Ni- and Mo-Based Catalysts.
Document Type
Article
Author
Gericke, Sabrina Maria; Rissler, Jenny; Bermeo, Marie; Wallander, Harald; Karlsson, Hanna; Kollberg, Linnéa; Scardamaglia, Mattia; Temperton, Robert; Zhu, Suyun; Sigfridsson Clauss, Kajsa G. V.; Hulteberg, Christian; Shavorskiy, Andrey; Merte, Lindsay Richard; Messing, Maria Elise; Zetterberg, Johan; Blomberg, Sara
Source
Subject
*ALUMINUM oxide
*BIMETALLIC catalysts
*MOLYBDENUM
*CATALYST supports
*CATALYSTS
*X-ray photoelectron spectroscopy
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Language
ISSN
2073-4344
Abstract
Nickel (Ni)-promoted Molybdenum (Mo)-based catalysts are used for hydrotreatment processes in the chemical industry where the catalysts are exposed to high-pressure H2 at elevated temperature. In this environment, the catalyst transforms into the active phase, which involves the reduction of the oxide. Here, we report on the first in situ study on the reduction of alumina supported Ni- and Mo-based catalysts in 1 mbar H2 using ambient-pressure X-ray photoelectron spectroscopy (APXPS). The study confirms that mixing Ni and Mo lowers the reduction temperature of both Ni- and Mo-oxide as compared to the monometallic catalysts and shows that the MoO3 reduction starts at a lower temperature than the reduction of NiO in NiMo/Al2O3 catalysts. Additionally, the reduction of Ni and Mo foil was directly compared to the reduction of the Al2O3-supported catalysts and it was observed that the reduction of the supported catalysts is more gradual than the reduction of the foils, indicating a strong interaction between the Ni/Mo and the alumina support. [ABSTRACT FROM AUTHOR]