Synthesis of niobium-doped titanate nanotubes as solid acid catalysts
Niobium-doped titanate nanotubes (Nb-TiNTs) with various Nb contents were prepared by hydrothermal treatment of Nb-doped TiO 2 with an aqueous NaOH solution and subsequent proton exchange. Nb-TiNTs effectively catalyzed the Friedel-Crafts alkylation of toluene with benzyl chloride or benzyl alcohol...
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| Veröffentlicht in: | Catalysis science & technology 2016-01, Vol.6 (13), p.4832-4839 |
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| container_title | Catalysis science & technology |
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| creator | Wada, Emiko Kitano, Masaaki Yamamoto, Kazuto Nakajima, Kiyotaka Hayashi, Shigenobu Hara, Michikazu |
| description | Niobium-doped titanate nanotubes (Nb-TiNTs) with various Nb contents were prepared by hydrothermal treatment of Nb-doped TiO
2
with an aqueous NaOH solution and subsequent proton exchange. Nb-TiNTs effectively catalyzed the Friedel-Crafts alkylation of toluene with benzyl chloride or benzyl alcohol and the activity increased with the Nb content, reaching a maximum at 5%. Furthermore, Nb-TiNTs exhibited much higher catalytic activity than other Nb-containing solid acid catalysts such as Nb
2
O
5
·
n
H
2
O, Nb-Ti mixed oxides and Nb-Ti nanosheet materials. Fourier transform-infrared (FT-IR) spectroscopy measurements revealed that Nb-TiNTs possess both Lewis and Brønsted acid sites, and the amounts of these acid sites are comparable to those of non-doped TiNTs. The high catalytic performance of Nb-TiNTs is attributable to their higher Brønsted acid strength and to the enhanced accessibility of reactant molecules to acid sites.
Niobium-doped titanate nanotubes function as an efficient solid acid catalyst for Friedel-Crafts alkylation of toluene with benzyl chloride or benzyl alcohol. Brønsted acid strength and accessibility of reactant molecules are enhanced by Nb-doping. |
| doi_str_mv | 10.1039/c6cy00044d |
| format | Article |
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2
with an aqueous NaOH solution and subsequent proton exchange. Nb-TiNTs effectively catalyzed the Friedel-Crafts alkylation of toluene with benzyl chloride or benzyl alcohol and the activity increased with the Nb content, reaching a maximum at 5%. Furthermore, Nb-TiNTs exhibited much higher catalytic activity than other Nb-containing solid acid catalysts such as Nb
2
O
5
·
n
H
2
O, Nb-Ti mixed oxides and Nb-Ti nanosheet materials. Fourier transform-infrared (FT-IR) spectroscopy measurements revealed that Nb-TiNTs possess both Lewis and Brønsted acid sites, and the amounts of these acid sites are comparable to those of non-doped TiNTs. The high catalytic performance of Nb-TiNTs is attributable to their higher Brønsted acid strength and to the enhanced accessibility of reactant molecules to acid sites.
Niobium-doped titanate nanotubes function as an efficient solid acid catalyst for Friedel-Crafts alkylation of toluene with benzyl chloride or benzyl alcohol. Brønsted acid strength and accessibility of reactant molecules are enhanced by Nb-doping.</description><identifier>ISSN: 2044-4753</identifier><identifier>EISSN: 2044-4761</identifier><identifier>DOI: 10.1039/c6cy00044d</identifier><language>eng</language><subject>Catalysis ; Catalysts ; Chlorides ; Exchange ; Nanostructure ; Nanotubes ; Titanates ; Titanium dioxide</subject><ispartof>Catalysis science & technology, 2016-01, Vol.6 (13), p.4832-4839</ispartof><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c474t-b87696a9d7b46e4a0641adfeda6fe505ef832985a969737fb739b88a14f964763</citedby><cites>FETCH-LOGICAL-c474t-b87696a9d7b46e4a0641adfeda6fe505ef832985a969737fb739b88a14f964763</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,27901,27902</link.rule.ids></links><search><creatorcontrib>Wada, Emiko</creatorcontrib><creatorcontrib>Kitano, Masaaki</creatorcontrib><creatorcontrib>Yamamoto, Kazuto</creatorcontrib><creatorcontrib>Nakajima, Kiyotaka</creatorcontrib><creatorcontrib>Hayashi, Shigenobu</creatorcontrib><creatorcontrib>Hara, Michikazu</creatorcontrib><title>Synthesis of niobium-doped titanate nanotubes as solid acid catalysts</title><title>Catalysis science & technology</title><description>Niobium-doped titanate nanotubes (Nb-TiNTs) with various Nb contents were prepared by hydrothermal treatment of Nb-doped TiO
2
with an aqueous NaOH solution and subsequent proton exchange. Nb-TiNTs effectively catalyzed the Friedel-Crafts alkylation of toluene with benzyl chloride or benzyl alcohol and the activity increased with the Nb content, reaching a maximum at 5%. Furthermore, Nb-TiNTs exhibited much higher catalytic activity than other Nb-containing solid acid catalysts such as Nb
2
O
5
·
n
H
2
O, Nb-Ti mixed oxides and Nb-Ti nanosheet materials. Fourier transform-infrared (FT-IR) spectroscopy measurements revealed that Nb-TiNTs possess both Lewis and Brønsted acid sites, and the amounts of these acid sites are comparable to those of non-doped TiNTs. The high catalytic performance of Nb-TiNTs is attributable to their higher Brønsted acid strength and to the enhanced accessibility of reactant molecules to acid sites.
Niobium-doped titanate nanotubes function as an efficient solid acid catalyst for Friedel-Crafts alkylation of toluene with benzyl chloride or benzyl alcohol. Brønsted acid strength and accessibility of reactant molecules are enhanced by Nb-doping.</description><subject>Catalysis</subject><subject>Catalysts</subject><subject>Chlorides</subject><subject>Exchange</subject><subject>Nanostructure</subject><subject>Nanotubes</subject><subject>Titanates</subject><subject>Titanium dioxide</subject><issn>2044-4753</issn><issn>2044-4761</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2016</creationdate><recordtype>article</recordtype><recordid>eNpF0D1LxEAQBuBFFDzOa-yFlCJEd5P9LCWeH3BgoRZWYbLZxZVc9sxsivx7oydnM-8UDwPzEnLO6DWjpbmx0k6UUs7bI7Io5sy5kuz4sIvylKwQP-kPMozqYkHWL1OfPhwGzKLP-hCbMG7zNu5cm6WQoIfksh76mMbGYQaYYexCm4Gdh4UE3YQJz8iJhw7d6i-X5O1-_Vo95pvnh6fqdpNbrnjKG62kkWBa1XDpOFDJGbTetSC9E1Q4r8vCaAFGGlUq36jSNFoD497I-ZdySS73d3dD_Bodpnob0Lqug97FEWumCyG4FlLN9GpP7RARB-fr3RC2MEw1o_VPXXUlq_ffuu5mfLHHA9qD-6-z_Ab1tWaT</recordid><startdate>20160101</startdate><enddate>20160101</enddate><creator>Wada, Emiko</creator><creator>Kitano, Masaaki</creator><creator>Yamamoto, Kazuto</creator><creator>Nakajima, Kiyotaka</creator><creator>Hayashi, Shigenobu</creator><creator>Hara, Michikazu</creator><scope>AAYXX</scope><scope>CITATION</scope><scope>7SR</scope><scope>8BQ</scope><scope>8FD</scope><scope>JG9</scope></search><sort><creationdate>20160101</creationdate><title>Synthesis of niobium-doped titanate nanotubes as solid acid catalysts</title><author>Wada, Emiko ; Kitano, Masaaki ; Yamamoto, Kazuto ; Nakajima, Kiyotaka ; Hayashi, Shigenobu ; Hara, Michikazu</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c474t-b87696a9d7b46e4a0641adfeda6fe505ef832985a969737fb739b88a14f964763</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2016</creationdate><topic>Catalysis</topic><topic>Catalysts</topic><topic>Chlorides</topic><topic>Exchange</topic><topic>Nanostructure</topic><topic>Nanotubes</topic><topic>Titanates</topic><topic>Titanium dioxide</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Wada, Emiko</creatorcontrib><creatorcontrib>Kitano, Masaaki</creatorcontrib><creatorcontrib>Yamamoto, Kazuto</creatorcontrib><creatorcontrib>Nakajima, Kiyotaka</creatorcontrib><creatorcontrib>Hayashi, Shigenobu</creatorcontrib><creatorcontrib>Hara, Michikazu</creatorcontrib><collection>CrossRef</collection><collection>Engineered Materials Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><jtitle>Catalysis science & technology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Wada, Emiko</au><au>Kitano, Masaaki</au><au>Yamamoto, Kazuto</au><au>Nakajima, Kiyotaka</au><au>Hayashi, Shigenobu</au><au>Hara, Michikazu</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Synthesis of niobium-doped titanate nanotubes as solid acid catalysts</atitle><jtitle>Catalysis science & technology</jtitle><date>2016-01-01</date><risdate>2016</risdate><volume>6</volume><issue>13</issue><spage>4832</spage><epage>4839</epage><pages>4832-4839</pages><issn>2044-4753</issn><eissn>2044-4761</eissn><abstract>Niobium-doped titanate nanotubes (Nb-TiNTs) with various Nb contents were prepared by hydrothermal treatment of Nb-doped TiO
2
with an aqueous NaOH solution and subsequent proton exchange. Nb-TiNTs effectively catalyzed the Friedel-Crafts alkylation of toluene with benzyl chloride or benzyl alcohol and the activity increased with the Nb content, reaching a maximum at 5%. Furthermore, Nb-TiNTs exhibited much higher catalytic activity than other Nb-containing solid acid catalysts such as Nb
2
O
5
·
n
H
2
O, Nb-Ti mixed oxides and Nb-Ti nanosheet materials. Fourier transform-infrared (FT-IR) spectroscopy measurements revealed that Nb-TiNTs possess both Lewis and Brønsted acid sites, and the amounts of these acid sites are comparable to those of non-doped TiNTs. The high catalytic performance of Nb-TiNTs is attributable to their higher Brønsted acid strength and to the enhanced accessibility of reactant molecules to acid sites.
Niobium-doped titanate nanotubes function as an efficient solid acid catalyst for Friedel-Crafts alkylation of toluene with benzyl chloride or benzyl alcohol. Brønsted acid strength and accessibility of reactant molecules are enhanced by Nb-doping.</abstract><doi>10.1039/c6cy00044d</doi><tpages>8</tpages></addata></record> |
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| ispartof | Catalysis science & technology, 2016-01, Vol.6 (13), p.4832-4839 |
| issn | 2044-4753 2044-4761 |
| language | eng |
| recordid | cdi_rsc_primary_c6cy00044d |
| source | Alma/SFX Local Collection; Royal Society of Chemistry E-Journals |
| subjects | Catalysis Catalysts Chlorides Exchange Nanostructure Nanotubes Titanates Titanium dioxide |
| title | Synthesis of niobium-doped titanate nanotubes as solid acid catalysts |
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