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Rodriguez R, Siri G, Cáceres C, Thomas H. Adsorption Parameters and Surface Species in the Nickel—Molybdenum Alumina System. ADSORPT SCI TECHNOL 2016. [DOI: 10.1177/026361748900600403] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Isotherms corresponding to the adsorption of ammonium heptamolybdate solutions on nickel–alumina supports have been studied. Such isotherms exhibit two distinct adsorption regions, with both the support and the adsorbed species contributing to their formation. Two types of site are available for adsorption on the support and, depending on the molybdenum concentration present in solution, either monomeric (at low concentrations) or polymeric molybdenum species (at high concentrations) are formed and adsorbed. Monomer adsorption occurs at low concentrations, whereas polyanion adsorption predominates at high concentrations; the latter is reflected in an abrupt increase in molybdenum concentration adsorbed on the support. The adsorption isotherms measured at 20°C and 50°C, and TPR and XPS studies indicate that the samples prepared at 50°C contain a lower quantity of octahedral molybdenum, although dispersion of the molybdenum on the surface is higher. In addition, a direct relationship exists between the dispersion of the active component and the hydrodesulphurization activity of the sample. The presence of nickel on the support does not affect the total number of sites occupied by molybdenum. However, when the nickel content on the solid is increased, the molybdenum species occupy a higher proportion of octahedral sites. XPS studies have shown that samples with a higher nickel content possess a better dispersion of molybdenum species and exhibit a higher intrinsic activity. Enhanced molybdenum dispersion and thiophene conversion was associated with samples in which molybdenum adsorption occurred before nickel impregnation. For all the series studies, the maximum value in the intrinsic acitivity occurred at the same value of the Ni/Mo atomic ratio. This provides convincing evidence that the precursor ratio is important in this catalyst system.
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Affiliation(s)
- R.A.E. Rodriguez
- Centro de Investigacion y Desarrollo en Procesos Cataliticos (CINDECA), Facultad de Ciencias Exactas, Universidad Nacional de La Plata, Calle 47 No. 257, 1900 La Plata, Argentina
| | - G.J. Siri
- Centro de Investigacion y Desarrollo en Procesos Cataliticos (CINDECA), Facultad de Ciencias Exactas, Universidad Nacional de La Plata, Calle 47 No. 257, 1900 La Plata, Argentina
| | - C.V. Cáceres
- Centro de Investigacion y Desarrollo en Procesos Cataliticos (CINDECA), Facultad de Ciencias Exactas, Universidad Nacional de La Plata, Calle 47 No. 257, 1900 La Plata, Argentina
| | - H.J. Thomas
- Centro de Investigacion y Desarrollo en Procesos Cataliticos (CINDECA), Facultad de Ciencias Exactas, Universidad Nacional de La Plata, Calle 47 No. 257, 1900 La Plata, Argentina
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van Haandel L, Bremmer M, Kooyman PJ, van Veen JAR, Weber T, Hensen EJM. Structure–Activity Correlations in Hydrodesulfurization Reactions over Ni-Promoted MoxW(1–x)S2/Al2O3 Catalysts. ACS Catal 2015. [DOI: 10.1021/acscatal.5b01806] [Citation(s) in RCA: 83] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Lennart van Haandel
- Laboratory
of Inorganic Materials Chemistry, Schuit Institute of Catalysis, Department
of Chemical Engineering and Chemistry, Eindhoven University of Technology, De Rondom 70, 5612 AP Eindhoven, The Netherlands
| | - Marien Bremmer
- Huygens-Kamerlingh
Onnes Laboratory, Leiden University, Niels Bohrweg 2, 2333 CA Leiden, The Netherlands
| | - Patricia J. Kooyman
- Department
of Chemical Engineering, Delft University of Technology, Julianalaan
136, 2628 BL Delft, The Netherlands
| | - J. A. Rob van Veen
- Laboratory
of Inorganic Materials Chemistry, Schuit Institute of Catalysis, Department
of Chemical Engineering and Chemistry, Eindhoven University of Technology, De Rondom 70, 5612 AP Eindhoven, The Netherlands
| | - Thomas Weber
- Laboratory
of Inorganic Materials Chemistry, Schuit Institute of Catalysis, Department
of Chemical Engineering and Chemistry, Eindhoven University of Technology, De Rondom 70, 5612 AP Eindhoven, The Netherlands
| | - Emiel J. M. Hensen
- Laboratory
of Inorganic Materials Chemistry, Schuit Institute of Catalysis, Department
of Chemical Engineering and Chemistry, Eindhoven University of Technology, De Rondom 70, 5612 AP Eindhoven, The Netherlands
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Okamoto Y. Novel Molecular Approaches to the Structure–Activity Relationships and Unique Characterizations of Co–Mo Sulfide Hydrodesulfurization Catalysts for the Production of Ultraclean Fuels. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2014. [DOI: 10.1246/bcsj.20130204] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Grimblot J. Genesis, architecture and nature of sites of Co(Ni)–MoS2 supported hydroprocessing catalysts. Catal Today 1998. [DOI: 10.1016/s0920-5861(98)00042-x] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Karroua M, Matralis H, Sham E, Grange P, Delmon B. Synergy between the CoMoS Phase and Supported or Unsupported Cobalt Sulfide. Existence of a Remote Control Effect. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 1995. [DOI: 10.1246/bcsj.68.107] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Papadopoulou C, Lycourghiotis A, Grange P, Delmon B. Fluorinated hydrotreatment catalysts. ACTA ACUST UNITED AC 1988. [DOI: 10.1016/s0166-9834(00)82830-4] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Kinetic modelling of catalytic reactions with a varying concentration of active sites. An analysis of the remote control model for HDS-catalysts. ACTA ACUST UNITED AC 1986. [DOI: 10.1016/s0166-9834(00)81360-3] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Delannay F. High resolution electron microscopy of hydrodesulfurization catalysts: A review. ACTA ACUST UNITED AC 1985. [DOI: 10.1016/s0166-9834(00)84467-x] [Citation(s) in RCA: 65] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Influence Of Phosphorus On The Hds Activity Of Ni-Mo/γ-al2O3 Catalysts. ACTA ACUST UNITED AC 1983. [DOI: 10.1016/s0167-2991(09)60030-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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