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Why does the Conductivity of a Nickel Catalyst Increase during Sulfidation? : An Exemplary Study Using an In Operando Sensor Device

Title data

Fremerey, Peter ; Jess, Andreas ; Moos, Ralf:
Why does the Conductivity of a Nickel Catalyst Increase during Sulfidation? : An Exemplary Study Using an In Operando Sensor Device.
In: Sensors. Vol. 15 (October 2015) Issue 10 . - pp. 27021-27034.
ISSN 1424-8220
DOI: https://doi.org/10.3390/s151027021

Official URL: Volltext

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Open Access PublizierenNo information

Abstract in another language

In order to study the sulfidation of a catalyst fixed bed, an in operando single pellet sensor was designed. A catalyst pellet from the fixed bed was electrically contacted and its electrical response was correlated with the catalyst behavior. For the sulfidation tests, a nickel catalyst was used and was sulfidized with H₂S. This catalyst had a very low conductivity in the reduced state. During sulfidation, the conductivity of the catalyst increased by decades. A reaction from nickel to nickel sulfide occurred. This conductivity increase by decades during sulfidation had not been expected since both nickel and nickel sulfides behave metallic. Only by assuming a percolation phenomenon that originates from a volume increase of the nickel contacts when reacting to nickel sulfides, this effect can be explained. This assumption was supported by sulfidation tests with differently nickel loaded catalysts and it was quantitatively estimated by a general effective media theory. The single pellet sensor device for in operando investigation of sulfidation can be considered as a valuable tool to get further insights into catalysts under reaction conditions.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: Special Issue Gas Sensors—Designs and Applications
Keywords: fixed bed catalyst; sulfur poisoning; nickel to nickel sulfide transformation; percolation; in operando
Institutions of the University: Faculties
Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Chemical Engineering
Faculties > Faculty of Engineering Science > Chair Chemical Engineering > Chair Chemical Engineering - Univ.-Prof. Dr.-Ing. Andreas Jess
Faculties > Faculty of Engineering Science > Chair Functional Materials
Faculties > Faculty of Engineering Science > Chair Functional Materials > Chair Functional Materials - Univ.-Prof. Dr.-Ing. Ralf Moos
Profile Fields
Profile Fields > Advanced Fields
Profile Fields > Advanced Fields > Advanced Materials
Research Institutions
Research Institutions > Research Centres
Research Institutions > Research Centres > Bayreuth Center for Material Science and Engineering - BayMAT
Research Institutions > Research Units > ZET - Zentrum für Energietechnik
Research Institutions > Research Units
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 540 Chemistry
600 Technology, medicine, applied sciences > 600 Technology
600 Technology, medicine, applied sciences > 620 Engineering
600 Technology, medicine, applied sciences > 660 Chemical engineering
Date Deposited: 29 Oct 2015 08:19
Last Modified: 17 May 2017 07:18
URI: https://eref.uni-bayreuth.de/id/eprint/20844