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Title: A sup 57 Co Moessbauer emission spectrometric study of some supported CoMo hydrodesulfurization catalysts

Abstract

A suite of 11 CoMo/Al{sub 2}O{sub 4} (and one CoMo/SiO{sub 2}) catalysts has been prepared employing four preparation routes, viz. one sequential-impregnation route and three different coimpregnation routes. Speciation of the Co present in the oxidic precursors (octahedral vs tetrahedral Co) and in the activated, sulfided catalysts (CoMoS, Co{sub 9}S{sub 8}, and unsulfided Co) was effected with the aid of {sup 57}Co Moessbauer emission spectroscopy (MES). A linear relation between the thiophene-hydrodesulfurization (HDS) activity and wt% Co-in-CoMoS was observed for each preparation route, but no unique correlation was found to exist. This was traced to the fact that the preparation routes differ in the amount of CoMoS I and CoMoS II they produce in the activated catalyst. Although these two phases differ in specific activity, CoMoS II being twice as active in thiophene HDS as CoMoS I, they cannot be distinguished on the basis of their Moessbauer parameters. It appears that octahedral Co is easier to sulfide than tetrahedral Co, but a substantial fraction of the latter is also found to be capable of entering CoMoS upon sulfidation. The reduced effectiveness of high-loading catalysts is traced to their being prone to CoMoO{sub 4} formation in the calcination step. A rationalizationmore » of this behavior is offered.« less

Authors:
; ;  [1]; ;  [2]
  1. (Koninklijke/Shell-Lab., Amsterdam (Netherlands))
  2. (Delft Univ. of Technology (Netherlands))
Publication Date:
OSTI Identifier:
6999031
Resource Type:
Journal Article
Journal Name:
Journal of Catalysis; (United States)
Additional Journal Information:
Journal Volume: 133:1; Journal ID: ISSN 0021-9517
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 02 PETROLEUM; 01 COAL, LIGNITE, AND PEAT; CATALYSTS; CHEMICAL PREPARATION; COBALT SULFIDES; CATALYTIC EFFECTS; MOLYBDENUM SULFIDES; THIOPHENE; DESULFURIZATION; ALUMINIUM OXIDES; BIMETALS; CATALYST SUPPORTS; COBALT; COBALT 57; EMISSION SPECTROSCOPY; IMPREGNATION; MOESSBAUER EFFECT; MOLYBDENUM; PHASE STUDIES; QUANTITY RATIO; SILICON OXIDES; ALUMINIUM COMPOUNDS; BETA DECAY RADIOISOTOPES; CHALCOGENIDES; CHEMICAL REACTIONS; COBALT COMPOUNDS; COBALT ISOTOPES; DAYS LIVING RADIOISOTOPES; ELECTRON CAPTURE RADIOISOTOPES; ELEMENTS; HETEROCYCLIC COMPOUNDS; INTERMEDIATE MASS NUCLEI; ISOTOPES; METALS; MOLYBDENUM COMPOUNDS; NUCLEI; ODD-EVEN NUCLEI; ORGANIC COMPOUNDS; ORGANIC SULFUR COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; RADIOISOTOPES; REFRACTORY METAL COMPOUNDS; SILICON COMPOUNDS; SPECTROSCOPY; SULFIDES; SULFUR COMPOUNDS; SYNTHESIS; TRANSITION ELEMENT COMPOUNDS; TRANSITION ELEMENTS; 400201* - Chemical & Physicochemical Properties; 020400 - Petroleum- Processing; 010402 - Coal, Lignite, & Peat- Purification & Upgrading

Citation Formats

Veen, J.A.R. van, Hendriks, P.A.J.M., Beens, H., Gerkema, E., and Kraan, A.M. van der. A sup 57 Co Moessbauer emission spectrometric study of some supported CoMo hydrodesulfurization catalysts. United States: N. p., 1992. Web. doi:10.1016/0021-9517(92)90189-O.
Veen, J.A.R. van, Hendriks, P.A.J.M., Beens, H., Gerkema, E., & Kraan, A.M. van der. A sup 57 Co Moessbauer emission spectrometric study of some supported CoMo hydrodesulfurization catalysts. United States. doi:10.1016/0021-9517(92)90189-O.
Veen, J.A.R. van, Hendriks, P.A.J.M., Beens, H., Gerkema, E., and Kraan, A.M. van der. Wed . "A sup 57 Co Moessbauer emission spectrometric study of some supported CoMo hydrodesulfurization catalysts". United States. doi:10.1016/0021-9517(92)90189-O.
@article{osti_6999031,
title = {A sup 57 Co Moessbauer emission spectrometric study of some supported CoMo hydrodesulfurization catalysts},
author = {Veen, J.A.R. van and Hendriks, P.A.J.M. and Beens, H. and Gerkema, E. and Kraan, A.M. van der},
abstractNote = {A suite of 11 CoMo/Al{sub 2}O{sub 4} (and one CoMo/SiO{sub 2}) catalysts has been prepared employing four preparation routes, viz. one sequential-impregnation route and three different coimpregnation routes. Speciation of the Co present in the oxidic precursors (octahedral vs tetrahedral Co) and in the activated, sulfided catalysts (CoMoS, Co{sub 9}S{sub 8}, and unsulfided Co) was effected with the aid of {sup 57}Co Moessbauer emission spectroscopy (MES). A linear relation between the thiophene-hydrodesulfurization (HDS) activity and wt% Co-in-CoMoS was observed for each preparation route, but no unique correlation was found to exist. This was traced to the fact that the preparation routes differ in the amount of CoMoS I and CoMoS II they produce in the activated catalyst. Although these two phases differ in specific activity, CoMoS II being twice as active in thiophene HDS as CoMoS I, they cannot be distinguished on the basis of their Moessbauer parameters. It appears that octahedral Co is easier to sulfide than tetrahedral Co, but a substantial fraction of the latter is also found to be capable of entering CoMoS upon sulfidation. The reduced effectiveness of high-loading catalysts is traced to their being prone to CoMoO{sub 4} formation in the calcination step. A rationalization of this behavior is offered.},
doi = {10.1016/0021-9517(92)90189-O},
journal = {Journal of Catalysis; (United States)},
issn = {0021-9517},
number = ,
volume = 133:1,
place = {United States},
year = {1992},
month = {1}
}