In Situ H2 Reduction of Al2O3-Supported Ni- and Mo-Based CatalystsShow others and affiliations
2022 (English)In: Catalysts, E-ISSN 2073-4344, Vol. 12, no 7, article id 755Article in journal (Refereed) Published
Abstract [en]
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. © 2022 by the authors.
Place, publisher, year, edition, pages
MDPI , 2022. Vol. 12, no 7, article id 755
Keywords [en]
APXPS, bimetallic catalysts, catalysis, in situ, NiMo-alumina, reduction, X-ray-based methods, XANES
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:ri:diva-60181DOI: 10.3390/catal12070755Scopus ID: 2-s2.0-85136432255OAI: oai:DiVA.org:ri-60181DiVA, id: diva2:1699840
Note
Export Date: 22 September 2022; Article; Correspondence Address: Gericke, S.M.; Division of Combustion Physics, P.O. Box 118, Sweden; email: sabrina_maria.gericke@forbrf.lth.se; Funding details: Stiftelsen för Strategisk Forskning, SSF, FFL18-0282, ITM17-0045; Funding details: VINNOVA, 2018-04969; Funding details: Svenska Forskningsrådet Formas, 2019-02496; Funding details: Carl Tryggers Stiftelse för Vetenskaplig Forskning, CTS 20:51; Funding details: Crafoordska Stiftelsen, 20201013; Funding details: Knut och Alice Wallenbergs Stiftelse, KAW 2015.0058; Funding details: Vetenskapsrådet, VR, 2018-07152; Funding text 1: The authors acknowledge the assistance of the researcher Crispin Hetherington from the Centre for Analysis and Synthesis at the Department of Chemistry for the STEM/EDX analysis of the Ni-Mo-based catalysts. We acknowledge MAX IV Laboratory for time on Beamline HIPPIE and Balder under Proposal 20200510 and 20190915. Research conducted at MAX IV, a Swedish national user facility, is supported by the Swedish Research council under contract 2018-07152, the Swedish Governmental Agency for Innovation Systems under contract 2018-04969, and Formas under contract 2019-02496.; Funding text 2: This research was funded by the Swedish Foundation for Strategic Research, grant number ITM17-0045 and FFL18-0282, by the Knut and Alice Wallenberg foundation (KAW)-funded project “Atomistic design of new catalysts”, grant number KAW 2015.0058 and by the Swedish Research Council, grant number 2018-05374. It is also supported by the Crafoord Foundation, grant number 20201013 and the Carl Trygger Foundation, grant number CTS 20:51.
2022-09-292022-09-292023-05-22Bibliographically approved