Effect of niobium on the surface properties of Nb2O5-SiO2-supported Mo catalysts
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| Title: | Effect of niobium on the surface properties of Nb |
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| Authors: | Damyanova, S.1 soniad@satline.net, Dimitrov, L.1, Petrov, L.1, Grange, P.2 |
| Source: | Applied Surface Science. May2003, Vol. 214 Issue 1-4, p68. 7p. |
| Subjects: | Niobium, Catalysts |
| Abstract: | Nb2O5–SiO2 oxides with different Nb content (0.8–4.4 wt.%) were prepared by impregnation of silica with ethanol solution of niobium ethoxide, Nb(OC2H5)5. Mo catalysts supported on the Nb2O5-SiO2 carriers were prepared by wetness impregnation method of the supports with an aqueous solution of ammonium heptamolybdate, (NH4)6Mo7O24. The samples were characterized by X-ray photoelectron spectroscopy (XPS) and diffuse reflectance spectroscopy (DRS). The chemical state and dispersion of metal components (Nb and Mo) were studied in the oxides and Mo-containing catalysts. It was shown a good correlation between the amount of Nb and XPS intensity Nb/Si ratios in oxide supports. Generation of new acid sites (Lewis and Bro¨nsted) in Nb2O5-SiO2 samples was easily understood when considering the change in the binding energies of Nb 3d and O 1s photoelectrons, due to a strong interaction between Nb atoms and silica. It was found that addition of niobium improves the dispersion of molybdenum on silica. [Copyright &y& Elsevier] |
| Copyright of Applied Surface Science is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 9951752 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Effect of niobium on the surface properties of Nb<subscript>2</subscript>O<subscript>5</subscript>-SiO<subscript>2</subscript>-supported Mo catalysts – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Damyanova%2C+S%2E%22">Damyanova, S.</searchLink><relatesTo>1</relatesTo><i> soniad@satline.net</i><br /><searchLink fieldCode="AR" term="%22Dimitrov%2C+L%2E%22">Dimitrov, L.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Petrov%2C+L%2E%22">Petrov, L.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Grange%2C+P%2E%22">Grange, P.</searchLink><relatesTo>2</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Applied+Surface+Science%22">Applied Surface Science</searchLink>. May2003, Vol. 214 Issue 1-4, p68. 7p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Niobium%22">Niobium</searchLink><br /><searchLink fieldCode="DE" term="%22Catalysts%22">Catalysts</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Nb2O5–SiO2 oxides with different Nb content (0.8–4.4 wt.%) were prepared by impregnation of silica with ethanol solution of niobium ethoxide, Nb(OC2H5)5. Mo catalysts supported on the Nb2O5-SiO2 carriers were prepared by wetness impregnation method of the supports with an aqueous solution of ammonium heptamolybdate, (NH4)6Mo7O24. The samples were characterized by X-ray photoelectron spectroscopy (XPS) and diffuse reflectance spectroscopy (DRS). The chemical state and dispersion of metal components (Nb and Mo) were studied in the oxides and Mo-containing catalysts. It was shown a good correlation between the amount of Nb and XPS intensity Nb/Si ratios in oxide supports. Generation of new acid sites (Lewis and Bro¨nsted) in Nb2O5-SiO2 samples was easily understood when considering the change in the binding energies of Nb 3d and O 1s photoelectrons, due to a strong interaction between Nb atoms and silica. It was found that addition of niobium improves the dispersion of molybdenum on silica. [Copyright &y& Elsevier] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Applied Surface Science is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/S0169-4332(03)00347-7 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 7 StartPage: 68 Subjects: – SubjectFull: Niobium Type: general – SubjectFull: Catalysts Type: general Titles: – TitleFull: Effect of niobium on the surface properties of Nb2O5-SiO2-supported Mo catalysts Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Damyanova, S. – PersonEntity: Name: NameFull: Dimitrov, L. – PersonEntity: Name: NameFull: Petrov, L. – PersonEntity: Name: NameFull: Grange, P. IsPartOfRelationships: – BibEntity: Dates: – D: 31 M: 05 Text: May2003 Type: published Y: 2003 Identifiers: – Type: issn-print Value: 01694332 Numbering: – Type: volume Value: 214 – Type: issue Value: 1-4 Titles: – TitleFull: Applied Surface Science Type: main |
| ResultId | 1 |
