TY - JOUR
T1 - The single-layered morphology of supported MoS2-based catalysts-The role of the cobalt promoter and its effects in the hydrodesulfurization of dibenzothiophene
AU - Berhault, Gilles
AU - Perez De la Rosa, Myriam
AU - Mehta, Apurva
AU - Yácaman, Miguel José
AU - Chianelli, Russell R.
N1 - Funding Information:
Portions of this research were carried out at the Stanford Synchrotron Radiation Laboratory, a national user facility operated by Stanford University on behalf of the U.S. Department of Energy, Office of Basic Energy Sciences. We would like to thank Samuel Texier from the Laboratoire de Catalyse en Chimie Organique, University of Poitiers, France for performing the DBT HDS tests, Dr. Alejandra Camacho and the department of Chemical Engineering and Center for Nano and Molecular Science and Technology at the University of Texas at Austin for the HRTEM analysis. The U.S. Department of Energy Gateway Program and the Robert A. Welch Foundation for financial support.
PY - 2008/7/31
Y1 - 2008/7/31
N2 - In order to completely resolve the morphology of supported hydrodesulfurization (HDS) catalysts, synchrotron X-ray scattering studies of silica- and alumina-supported MoS2 catalysts have been carried out and compared to results previously reported for their cobalt-promoted counterparts [J. Catal. 225 (2004) 288]. The present study is mainly centered on the structural role of cobalt and of support interactions and on their influence on the morphology and catalytic properties of these transition metal sulfide catalysts. Results showed that cobalt promoter strongly enhances the stacking height of MoS2 layers. However this effect is counterbalanced by hydrodesulfurization conditions that favor in an opposite way the formation of single slabs. Single slab morphology suggests that the vast majority of the sites on MoS2 layers are "rim" sites able to perform both hydrogenation and C{single bond}S bond cleavage steps. Moreover, the complete determination of the morphology of these catalysts allowed correlation of structural and catalytic properties for both supported MoS2 and CoMo catalysts. This approach led us to examine the respective influences of the MoS2 slab morphology and of support interactions on activity and selectivity properties of HDS MoS2-based catalysts.
AB - In order to completely resolve the morphology of supported hydrodesulfurization (HDS) catalysts, synchrotron X-ray scattering studies of silica- and alumina-supported MoS2 catalysts have been carried out and compared to results previously reported for their cobalt-promoted counterparts [J. Catal. 225 (2004) 288]. The present study is mainly centered on the structural role of cobalt and of support interactions and on their influence on the morphology and catalytic properties of these transition metal sulfide catalysts. Results showed that cobalt promoter strongly enhances the stacking height of MoS2 layers. However this effect is counterbalanced by hydrodesulfurization conditions that favor in an opposite way the formation of single slabs. Single slab morphology suggests that the vast majority of the sites on MoS2 layers are "rim" sites able to perform both hydrogenation and C{single bond}S bond cleavage steps. Moreover, the complete determination of the morphology of these catalysts allowed correlation of structural and catalytic properties for both supported MoS2 and CoMo catalysts. This approach led us to examine the respective influences of the MoS2 slab morphology and of support interactions on activity and selectivity properties of HDS MoS2-based catalysts.
KW - Cobalt promotion
KW - CoMo
KW - Hydrodesulfurization
KW - Hydrogenation
KW - Selectivity
KW - Support interaction
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U2 - 10.1016/j.apcata.2008.04.034
DO - 10.1016/j.apcata.2008.04.034
M3 - Article
AN - SCOPUS:45849104773
SN - 0926-860X
VL - 345
SP - 80
EP - 88
JO - Applied Catalysis A: General
JF - Applied Catalysis A: General
IS - 1
ER -