Characterization of the acidic sites in organic acid functionalized mesoporous silica in an aqueous media
[Display omitted] ► Method developed to characterize the aqueous phase acidity of solid acid catalysts. ► Bulk aqueous phase pK a of solid Brönsted acid catalysts can be reliably determined. ► Appropriate titration conditions are established for solid acid characterization. ► Method validated by mea...
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| Veröffentlicht in: | Applied catalysis. A, General General, 2011-04, Vol.396 (1), p.76-84 |
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| container_title | Applied catalysis. A, General |
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| creator | Cinlar, Basak Shanks, Brent H. |
| description | [Display omitted]
► Method developed to characterize the aqueous phase acidity of solid acid catalysts. ► Bulk aqueous phase pK
a of solid Brönsted acid catalysts can be reliably determined. ► Appropriate titration conditions are established for solid acid characterization. ► Method validated by measuring pK
as of tethered organic acid functional groups. ► Improved acid characterization method over gas phase surrogate measurement.
Exploring the catalytic potential of organic acid functionalized mesoporous silica in condensed phase necessitates characterization of their acidic properties in a similar environment. In this study, potentiometric titration is used as a direct measurement technique to determine the acidic strength and total acid capacity of propylsulfonic, arenesulfonic, ethylphosphonic, and butylcarboxylic functionalized mesoporous silica catalysts in water. While the method can provide direct insight into the acidic properties of the materials the characterization conditions must be carefully chosen to yield reliable results. The addition of salts are required for enhancing the ion-exchange in the titration procedure, but their over-addition leads to significant deviation of the activity coefficients leading to incorrect results. Titrations, which are performed under reliable characterization conditions, demonstrate that network interactions can exist between the organic acid functional groups, but their interaction with surface silanols does not appear to play a significant role on acidic properties. While the strongest acidity is observed for the arenesulfonic acid functionalized material, none of the acidic materials are leveled in an aqueous solvent. |
| doi_str_mv | 10.1016/j.apcata.2011.01.044 |
| format | Article |
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► Method developed to characterize the aqueous phase acidity of solid acid catalysts. ► Bulk aqueous phase pK
a of solid Brönsted acid catalysts can be reliably determined. ► Appropriate titration conditions are established for solid acid characterization. ► Method validated by measuring pK
as of tethered organic acid functional groups. ► Improved acid characterization method over gas phase surrogate measurement.
Exploring the catalytic potential of organic acid functionalized mesoporous silica in condensed phase necessitates characterization of their acidic properties in a similar environment. In this study, potentiometric titration is used as a direct measurement technique to determine the acidic strength and total acid capacity of propylsulfonic, arenesulfonic, ethylphosphonic, and butylcarboxylic functionalized mesoporous silica catalysts in water. While the method can provide direct insight into the acidic properties of the materials the characterization conditions must be carefully chosen to yield reliable results. The addition of salts are required for enhancing the ion-exchange in the titration procedure, but their over-addition leads to significant deviation of the activity coefficients leading to incorrect results. Titrations, which are performed under reliable characterization conditions, demonstrate that network interactions can exist between the organic acid functional groups, but their interaction with surface silanols does not appear to play a significant role on acidic properties. While the strongest acidity is observed for the arenesulfonic acid functionalized material, none of the acidic materials are leveled in an aqueous solvent.</description><identifier>ISSN: 0926-860X</identifier><identifier>EISSN: 1873-3875</identifier><identifier>DOI: 10.1016/j.apcata.2011.01.044</identifier><language>eng</language><publisher>Kidlington: Elsevier B.V</publisher><subject>Acidity characterization ; Catalysis ; Catalysts ; Chemistry ; Colloidal state and disperse state ; Condensed phase acidity measurement ; Condensing ; Deviation ; Exact sciences and technology ; General and physical chemistry ; Organic acids ; pK a determination ; Porous materials ; Silicon dioxide ; Solid acid catalysts ; Solvents ; Surface chemistry ; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry ; Titration</subject><ispartof>Applied catalysis. A, General, 2011-04, Vol.396 (1), p.76-84</ispartof><rights>2011 Elsevier B.V.</rights><rights>2015 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c434t-265979330d793fb1ee54c28819a891fceff9cab1bd448e4f4de115ea27c22d083</citedby><cites>FETCH-LOGICAL-c434t-265979330d793fb1ee54c28819a891fceff9cab1bd448e4f4de115ea27c22d083</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.apcata.2011.01.044$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,780,784,3548,27923,27924,45994</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=24046675$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Cinlar, Basak</creatorcontrib><creatorcontrib>Shanks, Brent H.</creatorcontrib><title>Characterization of the acidic sites in organic acid functionalized mesoporous silica in an aqueous media</title><title>Applied catalysis. A, General</title><description>[Display omitted]
► Method developed to characterize the aqueous phase acidity of solid acid catalysts. ► Bulk aqueous phase pK
a of solid Brönsted acid catalysts can be reliably determined. ► Appropriate titration conditions are established for solid acid characterization. ► Method validated by measuring pK
as of tethered organic acid functional groups. ► Improved acid characterization method over gas phase surrogate measurement.
Exploring the catalytic potential of organic acid functionalized mesoporous silica in condensed phase necessitates characterization of their acidic properties in a similar environment. In this study, potentiometric titration is used as a direct measurement technique to determine the acidic strength and total acid capacity of propylsulfonic, arenesulfonic, ethylphosphonic, and butylcarboxylic functionalized mesoporous silica catalysts in water. While the method can provide direct insight into the acidic properties of the materials the characterization conditions must be carefully chosen to yield reliable results. The addition of salts are required for enhancing the ion-exchange in the titration procedure, but their over-addition leads to significant deviation of the activity coefficients leading to incorrect results. Titrations, which are performed under reliable characterization conditions, demonstrate that network interactions can exist between the organic acid functional groups, but their interaction with surface silanols does not appear to play a significant role on acidic properties. While the strongest acidity is observed for the arenesulfonic acid functionalized material, none of the acidic materials are leveled in an aqueous solvent.</description><subject>Acidity characterization</subject><subject>Catalysis</subject><subject>Catalysts</subject><subject>Chemistry</subject><subject>Colloidal state and disperse state</subject><subject>Condensed phase acidity measurement</subject><subject>Condensing</subject><subject>Deviation</subject><subject>Exact sciences and technology</subject><subject>General and physical chemistry</subject><subject>Organic acids</subject><subject>pK a determination</subject><subject>Porous materials</subject><subject>Silicon dioxide</subject><subject>Solid acid catalysts</subject><subject>Solvents</subject><subject>Surface chemistry</subject><subject>Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry</subject><subject>Titration</subject><issn>0926-860X</issn><issn>1873-3875</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2011</creationdate><recordtype>article</recordtype><recordid>eNp9kEFrGzEQhUVIoU6af9DDXkpO60ra2V3pUggmaQuGXlrITYxnR7XMeteV1oH410eLTY6FQYLH9_RGT4jPSi6VVM3X3RIPhBMutVRqKfMAXImFMm1VVqatr8VCWt2UppHPH8VNSjsppQZbL0RYbTEiTRzDCacwDsXoi2nLBVLoAhUpTJyKkOX4F4cszHrhjwPNMPbhxF2x5zQexjgeU-b7QDgbMM-_I8_inruAn8QHj33iu8t9K_48Pf5e_SjXv77_XD2sS4IKplI3tW1tVckun36jmGsgbYyyaKzyxN5bwo3adACGwUPHStWMuiWtO2mqW3F_fvcQx5yfJrcPibjvcZiXcaaxBkAqm0k4kxTHlCJ7d4hhj_HVKenmYt3OnYt1c7FO5gHIti-XAEyEvY84UEjvXg0SmqatM_ftzHH-7Uvg6BIFHiiXEZkm143h_0FvMeSSBQ</recordid><startdate>20110415</startdate><enddate>20110415</enddate><creator>Cinlar, Basak</creator><creator>Shanks, Brent H.</creator><general>Elsevier B.V</general><general>Elsevier</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7SR</scope><scope>7U5</scope><scope>8BQ</scope><scope>8FD</scope><scope>JG9</scope><scope>L7M</scope></search><sort><creationdate>20110415</creationdate><title>Characterization of the acidic sites in organic acid functionalized mesoporous silica in an aqueous media</title><author>Cinlar, Basak ; Shanks, Brent H.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c434t-265979330d793fb1ee54c28819a891fceff9cab1bd448e4f4de115ea27c22d083</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2011</creationdate><topic>Acidity characterization</topic><topic>Catalysis</topic><topic>Catalysts</topic><topic>Chemistry</topic><topic>Colloidal state and disperse state</topic><topic>Condensed phase acidity measurement</topic><topic>Condensing</topic><topic>Deviation</topic><topic>Exact sciences and technology</topic><topic>General and physical chemistry</topic><topic>Organic acids</topic><topic>pK a determination</topic><topic>Porous materials</topic><topic>Silicon dioxide</topic><topic>Solid acid catalysts</topic><topic>Solvents</topic><topic>Surface chemistry</topic><topic>Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry</topic><topic>Titration</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Cinlar, Basak</creatorcontrib><creatorcontrib>Shanks, Brent H.</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Engineered Materials Abstracts</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Applied catalysis. A, General</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Cinlar, Basak</au><au>Shanks, Brent H.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Characterization of the acidic sites in organic acid functionalized mesoporous silica in an aqueous media</atitle><jtitle>Applied catalysis. A, General</jtitle><date>2011-04-15</date><risdate>2011</risdate><volume>396</volume><issue>1</issue><spage>76</spage><epage>84</epage><pages>76-84</pages><issn>0926-860X</issn><eissn>1873-3875</eissn><abstract>[Display omitted]
► Method developed to characterize the aqueous phase acidity of solid acid catalysts. ► Bulk aqueous phase pK
a of solid Brönsted acid catalysts can be reliably determined. ► Appropriate titration conditions are established for solid acid characterization. ► Method validated by measuring pK
as of tethered organic acid functional groups. ► Improved acid characterization method over gas phase surrogate measurement.
Exploring the catalytic potential of organic acid functionalized mesoporous silica in condensed phase necessitates characterization of their acidic properties in a similar environment. In this study, potentiometric titration is used as a direct measurement technique to determine the acidic strength and total acid capacity of propylsulfonic, arenesulfonic, ethylphosphonic, and butylcarboxylic functionalized mesoporous silica catalysts in water. While the method can provide direct insight into the acidic properties of the materials the characterization conditions must be carefully chosen to yield reliable results. The addition of salts are required for enhancing the ion-exchange in the titration procedure, but their over-addition leads to significant deviation of the activity coefficients leading to incorrect results. Titrations, which are performed under reliable characterization conditions, demonstrate that network interactions can exist between the organic acid functional groups, but their interaction with surface silanols does not appear to play a significant role on acidic properties. While the strongest acidity is observed for the arenesulfonic acid functionalized material, none of the acidic materials are leveled in an aqueous solvent.</abstract><cop>Kidlington</cop><pub>Elsevier B.V</pub><doi>10.1016/j.apcata.2011.01.044</doi><tpages>9</tpages></addata></record> |
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| ispartof | Applied catalysis. A, General, 2011-04, Vol.396 (1), p.76-84 |
| issn | 0926-860X 1873-3875 |
| language | eng |
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| source | ScienceDirect Journals (5 years ago - present) |
| subjects | Acidity characterization Catalysis Catalysts Chemistry Colloidal state and disperse state Condensed phase acidity measurement Condensing Deviation Exact sciences and technology General and physical chemistry Organic acids pK a determination Porous materials Silicon dioxide Solid acid catalysts Solvents Surface chemistry Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry Titration |
| title | Characterization of the acidic sites in organic acid functionalized mesoporous silica in an aqueous media |
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