Spillover hydrogen mobility during Co-Mo catalyzed HDS in industrial-like conditions

P. Baeza; M. Villarroel; P. Ávila; A. López Agudo; B. Delmon; F. J. Gil-Llambías

doi:10.1016/j.apcata.2006.02.029

Spillover hydrogen mobility during Co-Mo catalyzed HDS in industrial-like conditions

P. Baeza, M. Villarroel, P. Ávila, A. López Agudo, B. Delmon, F. J. Gil-Llambías

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52 Scopus citations

Abstract

The work concerns the spillover hydrogen (H_so) mobility between Co₉S₈ and MoS₂ and the corresponding synergetic effects in gas-oil hydrodesulfurization (HDS), when a solid material separates the partners, either as a powder or a monolith surface. The influences of the distance (0-10 mm) between Co₉S₈ and MoS₂ and the nature of the separator (γ-Al₂O₃, SiO₂, carbon, MgSiO₃ and two silica-aluminas) on the synergism were studied. A correlation exists between the value of the isoelectric point (IEP) of the separator surface and the enhancement of HDS activity. Inferring that the synergetic effect is due to hydrogen spillover, this shows that the IEP is an important parameter controlling spillover. To our knowledge, this is the first time the IEP of surfaces has been shown to have a direct effect on the spillover of hydrogen. The other results confirm that the remote control model is able to explain the synergism detected in this study.

Original language	English
Pages (from-to)	109-115
Number of pages	7
Journal	Applied Catalysis A: General
Volume	304
Issue number	1-2
DOIs	https://doi.org/10.1016/j.apcata.2006.02.029
State	Published - 10 May 2006
Externally published	Yes

Keywords

CoS and MoS phases
Composite bed
Hydrodesulfurization
Industrial-like conditions
Monolith support
Remote control
Spillover hydrogen

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10.1016/j.apcata.2006.02.029

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title = "Spillover hydrogen mobility during Co-Mo catalyzed HDS in industrial-like conditions",

abstract = "The work concerns the spillover hydrogen (Hso) mobility between Co9S8 and MoS2 and the corresponding synergetic effects in gas-oil hydrodesulfurization (HDS), when a solid material separates the partners, either as a powder or a monolith surface. The influences of the distance (0-10 mm) between Co9S8 and MoS2 and the nature of the separator (γ-Al2O3, SiO2, carbon, MgSiO3 and two silica-aluminas) on the synergism were studied. A correlation exists between the value of the isoelectric point (IEP) of the separator surface and the enhancement of HDS activity. Inferring that the synergetic effect is due to hydrogen spillover, this shows that the IEP is an important parameter controlling spillover. To our knowledge, this is the first time the IEP of surfaces has been shown to have a direct effect on the spillover of hydrogen. The other results confirm that the remote control model is able to explain the synergism detected in this study.",

keywords = "CoS and MoS phases, Composite bed, Hydrodesulfurization, Industrial-like conditions, Monolith support, Remote control, Spillover hydrogen",

author = "P. Baeza and M. Villarroel and P. {\'A}vila and {L{\'o}pez Agudo}, A. and B. Delmon and Gil-Llamb{\'i}as, {F. J.}",

note = "Funding Information: Financial supports from FONDECYT, Chile (Projects 1990496-6 and 1020043) CONICYT, Chile (grant for Ph.D. A.T. 4040033), the Scientific Cooperation Program CSIC (Spain), USACH (Chile) (Project 2003CL0004), and from the Program CYTED, Subprogram V (Spain), are gratefully acknowledged.",

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language = "English",

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TY - JOUR

T1 - Spillover hydrogen mobility during Co-Mo catalyzed HDS in industrial-like conditions

AU - Baeza, P.

AU - Villarroel, M.

AU - Ávila, P.

AU - López Agudo, A.

AU - Delmon, B.

AU - Gil-Llambías, F. J.

N1 - Funding Information: Financial supports from FONDECYT, Chile (Projects 1990496-6 and 1020043) CONICYT, Chile (grant for Ph.D. A.T. 4040033), the Scientific Cooperation Program CSIC (Spain), USACH (Chile) (Project 2003CL0004), and from the Program CYTED, Subprogram V (Spain), are gratefully acknowledged.

PY - 2006/5/10

Y1 - 2006/5/10

N2 - The work concerns the spillover hydrogen (Hso) mobility between Co9S8 and MoS2 and the corresponding synergetic effects in gas-oil hydrodesulfurization (HDS), when a solid material separates the partners, either as a powder or a monolith surface. The influences of the distance (0-10 mm) between Co9S8 and MoS2 and the nature of the separator (γ-Al2O3, SiO2, carbon, MgSiO3 and two silica-aluminas) on the synergism were studied. A correlation exists between the value of the isoelectric point (IEP) of the separator surface and the enhancement of HDS activity. Inferring that the synergetic effect is due to hydrogen spillover, this shows that the IEP is an important parameter controlling spillover. To our knowledge, this is the first time the IEP of surfaces has been shown to have a direct effect on the spillover of hydrogen. The other results confirm that the remote control model is able to explain the synergism detected in this study.

AB - The work concerns the spillover hydrogen (Hso) mobility between Co9S8 and MoS2 and the corresponding synergetic effects in gas-oil hydrodesulfurization (HDS), when a solid material separates the partners, either as a powder or a monolith surface. The influences of the distance (0-10 mm) between Co9S8 and MoS2 and the nature of the separator (γ-Al2O3, SiO2, carbon, MgSiO3 and two silica-aluminas) on the synergism were studied. A correlation exists between the value of the isoelectric point (IEP) of the separator surface and the enhancement of HDS activity. Inferring that the synergetic effect is due to hydrogen spillover, this shows that the IEP is an important parameter controlling spillover. To our knowledge, this is the first time the IEP of surfaces has been shown to have a direct effect on the spillover of hydrogen. The other results confirm that the remote control model is able to explain the synergism detected in this study.

KW - CoS and MoS phases

KW - Composite bed

KW - Hydrodesulfurization

KW - Industrial-like conditions

KW - Monolith support

KW - Remote control

KW - Spillover hydrogen

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JO - Applied Catalysis A: General

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Spillover hydrogen mobility during Co-Mo catalyzed HDS in industrial-like conditions

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