Simultaneous hydrodenitrogenation and hydrodesulfurization of model compounds on unsupported Ni-Mo-W sulfide catalysts

S. Albersberger, J. Hein, O. Y. Gutiérrez, J. A. Lercher

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Unsupported multimetallic sulfides are an outstanding family of hydrotreating catalysts due to their high activity and stability under demanding reaction conditions. Their complexity renders their fundamental study challenging and, therefore, scarce. Thus, the properties needed for obtaining high activity in the removal of sulfur and nitrogen are still unclear. In this work, a series of NiMoW sulfide catalysts were obtained from precursors synthesized by co-precipitation of and decomposition of salt precursors at atmospheric pressure, or hydrothermal conditions. As a result, catalysts with diverse texture and morphology features were obtained and tested in the simultaneous hydrodenitrogenation (HDN) of quinoline and hydrodesulfurization (HDS) of dibenzothiophene (DBT). The HDN of quinoline proceeds rapidly towards hydrogenated bicyclic heteroaromatic compounds, which undergo ring opening and subsequent C-N bond cleavage. The HDN rates were enhanced in the presence of DBT. All sulfide catalysts consist of mixtures of Ni-promoted Mo(W)S2, and Ni3S2. However, different activity rankings are observed, which cannot be correlated with one single catalyst property. Therefore, different combinations of material properties are needed for optimum HDS and HDN rates. That is, high specific surface area and high bulk W content are needed to have high activity, whereas long Mo(W)S2 slabs have a negative impact.

Original languageEnglish
Title of host publicationPreprints of the DGMK-International Conference - "Catalysis - Novel Aspects in Petrochemistry and Refining"
EditorsU. Balfanz, M. Beller, M. Marchionna, M. Bender, S. Ernst, H. Hager
PublisherDeutsche Wissens. Gesell. fur Erdoel, Erdgas und Kohle EV
Pages169-174
Number of pages6
ISBN (Electronic)9783941721661
StatePublished - 2016
Event2016 DGMK-International Conference on Catalysis - Novel Aspects in Petrochemistry and Refining - Berlin, Germany
Duration: 26 Sep 201628 Sep 2016

Publication series

NameDGMK Tagungsbericht
Volume3
ISSN (Print)1433-9013

Conference

Conference2016 DGMK-International Conference on Catalysis - Novel Aspects in Petrochemistry and Refining
Country/TerritoryGermany
CityBerlin
Period26/09/1628/09/16

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