No abstract

The sulfided form of NiO‐WO3/Al2O3 catalysts is applied for hydrotreating and hydrocracking reactions.

No abstract

A comprehensive overview of the reduction behavior of sulfided Co/Al2O3, Mo/Al2O3, and Co‐Mo/Al2O3 hydrodesulfurization (HDS) catalysts is given by interpretation of temp.‐programmed reduction (TPR) studies.

Mangnus, P.J.; van Veen, J.A.R.; Eijsbouts, S.; de Beer, V.H.J.; Moulijn, J.A. Published in: Applied Catalysis DOI:10.1016/S0166-9834(00) Published: 01/01/1990 Document VersionPublisher's PDF, also known as Version of Record (includes final page, issue and volume numbers) Please check the document version of this publication:• A submitted manuscript is the author's version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website.• The final author version and the galley proof are versions of the publication after peer review.• The final published version features the final layout of the paper including the volume, issue and page numbers. Link to publication General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. ABSTRACTThe influence of phosphate (P) on the structure of alumina-supported CO-MO catalysts was studied by means of temperature-programmed reduction (TPR). Conclusions deduced from these TPR measurements were supported by Fourier transform infrared (FT-IR) and Raman measurements. Phosphorus added by sequential impregnation or coimpregnation had a great influence on both Co and MO surface structure. Addition of P to an alumina support resulted in the formation of a well dispersed AlPO, surface layer. Next to the phases already reported on Co/Al,O, catalyst, cobalt can be present in interaction with the AlPO, species in Co-P/A&O, catalysts. Coimpregnation of Co and P increased the dispersion of the cobalt species. The influence of P on the distribution of the MO species depends on the P content and the sequence of impregnation. On MO-P catalysts, prepared by coimpregnation, the reducibility of apart of the MO species decreased with increasing P content due to the formation of MO-O-P species. On the catalysts prepared by sequential impregnation of P and MO a part of the MO was present in MOO, crystallites, the other part was very well distributed over the AlPO, surface layer. These results suggest that at high P loadings, MO can be present as a MO-AlPO, surface structure. Both sequential and coimpregnation of Co, MO and ...