Shape-dependence of the thermal and photochemical reactions of methanol on nanocrystalline anatase TiO2.
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| Title: | Shape-dependence of the thermal and photochemical reactions of methanol on nanocrystalline anatase TiO2. |
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| Authors: | Bennett, David A.1, Cargnello, Matteo2, Diroll, Benjamin T.3, Murray, Christopher B.3, Vohs, John M.1 vohs@seas.upenn.edu |
| Source: | Surface Science. Dec2016, Vol. 654, p1-7. 7p. |
| Subjects: | Titanium dioxide, Photooxidation, Methanol, Chemical reactions, Nanoparticles analysis, Particle size distribution, Structure-activity relationships |
| Abstract: | Structure-activity relationships and the influence of particle size and shape on the partial- and photo-oxidation of methanol on nanocrystalline anatase TiO 2 were investigated using temperature-programmed desorption. The study employed two distinct nanoparticle morphologies: truncated bipyramids exposing primarily {101} facets, and flatter platelets exposing primarily {001} surfaces, whose nominal sizes ranged from 10 to 25 nm. The platelets were found to be more active for thermally-driven reactions, such as coupling of methoxide groups to produce dimethyl ether, and deoxygenation to produce methane. A dependence of the reactivity of {001} facets for the coupling of methoxide groups to produce dimethyl ether on facet size was also observed. In contrast to the thermally-driven reactions, the bipyramidal nanoparticles were observed to be more active for a range of photochemical reactions, including oxidation and coupling to produce methyl formate, and photo-decomposition of surface methoxide species. This study also shows how well-defined nanocrystals can be used to help bridge the materials gap between studies of single crystal model catalysts and their high surface area industrial analogs. [ABSTRACT FROM AUTHOR] |
| Copyright of 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: 118179292 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Shape-dependence of the thermal and photochemical reactions of methanol on nanocrystalline anatase TiO2. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Bennett%2C+David+A%2E%22">Bennett, David A.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Cargnello%2C+Matteo%22">Cargnello, Matteo</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Diroll%2C+Benjamin+T%2E%22">Diroll, Benjamin T.</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Murray%2C+Christopher+B%2E%22">Murray, Christopher B.</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Vohs%2C+John+M%2E%22">Vohs, John M.</searchLink><relatesTo>1</relatesTo><i> vohs@seas.upenn.edu</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Surface+Science%22">Surface Science</searchLink>. Dec2016, Vol. 654, p1-7. 7p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Titanium+dioxide%22">Titanium dioxide</searchLink><br /><searchLink fieldCode="DE" term="%22Photooxidation%22">Photooxidation</searchLink><br /><searchLink fieldCode="DE" term="%22Methanol%22">Methanol</searchLink><br /><searchLink fieldCode="DE" term="%22Chemical+reactions%22">Chemical reactions</searchLink><br /><searchLink fieldCode="DE" term="%22Nanoparticles+analysis%22">Nanoparticles analysis</searchLink><br /><searchLink fieldCode="DE" term="%22Particle+size+distribution%22">Particle size distribution</searchLink><br /><searchLink fieldCode="DE" term="%22Structure-activity+relationships%22">Structure-activity relationships</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Structure-activity relationships and the influence of particle size and shape on the partial- and photo-oxidation of methanol on nanocrystalline anatase TiO 2 were investigated using temperature-programmed desorption. The study employed two distinct nanoparticle morphologies: truncated bipyramids exposing primarily {101} facets, and flatter platelets exposing primarily {001} surfaces, whose nominal sizes ranged from 10 to 25 nm. The platelets were found to be more active for thermally-driven reactions, such as coupling of methoxide groups to produce dimethyl ether, and deoxygenation to produce methane. A dependence of the reactivity of {001} facets for the coupling of methoxide groups to produce dimethyl ether on facet size was also observed. In contrast to the thermally-driven reactions, the bipyramidal nanoparticles were observed to be more active for a range of photochemical reactions, including oxidation and coupling to produce methyl formate, and photo-decomposition of surface methoxide species. This study also shows how well-defined nanocrystals can be used to help bridge the materials gap between studies of single crystal model catalysts and their high surface area industrial analogs. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of 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/j.susc.2016.07.009 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 7 StartPage: 1 Subjects: – SubjectFull: Titanium dioxide Type: general – SubjectFull: Photooxidation Type: general – SubjectFull: Methanol Type: general – SubjectFull: Chemical reactions Type: general – SubjectFull: Nanoparticles analysis Type: general – SubjectFull: Particle size distribution Type: general – SubjectFull: Structure-activity relationships Type: general Titles: – TitleFull: Shape-dependence of the thermal and photochemical reactions of methanol on nanocrystalline anatase TiO2. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Bennett, David A. – PersonEntity: Name: NameFull: Cargnello, Matteo – PersonEntity: Name: NameFull: Diroll, Benjamin T. – PersonEntity: Name: NameFull: Murray, Christopher B. – PersonEntity: Name: NameFull: Vohs, John M. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 12 Text: Dec2016 Type: published Y: 2016 Identifiers: – Type: issn-print Value: 00396028 Numbering: – Type: volume Value: 654 Titles: – TitleFull: Surface Science Type: main |
| ResultId | 1 |
