Assessment of surface acidity in mesoporous materials containing aluminum and titanium
The surface acidity of mesoporous molecular sieves of aluminum and titanium was evaluated using four different techniques: n-butylamine volumetry, cyclohexylamine thermodesorption, temperature-programmed desorption of ammonia and adsorption of pyridine. The nature, strength and concentration of the...
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| Veröffentlicht in: | Applied surface science 2009-04, Vol.255 (12), p.6205-6209 |
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| creator | Araújo, Rinaldo S. Maia, Débora A.S. Azevedo, Diana C.S. Cavalcante, Célio L. Rodríguez-Castellón, E. Jimenez-Lopez, A. |
| description | The surface acidity of mesoporous molecular sieves of aluminum and titanium was evaluated using four different techniques:
n-butylamine volumetry, cyclohexylamine thermodesorption, temperature-programmed desorption of ammonia and adsorption of pyridine. The nature, strength and concentration of the acid sites were determined and correlated to the results of a probe reaction of anthracene oxidation to 9,10-anthraquinone (in liquid phase). In general, the surface acidity was highly influenced by the nature, location and coordination of the metal species (Al and Ti) in the mesoporous samples. Moderate to strong Brönsted acid sites were identified for the Al-MCM-41 sample in a large temperature range. For mesoporous materials containing Ti, the acidity was represented by a combination of weak to moderate Brönsted and Lewis acid sites. The Ti-HMS sample exhibits a higher acidity of moderate strength together with a well-balanced concentration of Brönsted and Lewis acid sites, which enhanced both conversion and selectivity in the oxidation reaction of anthracene. |
| doi_str_mv | 10.1016/j.apsusc.2009.01.076 |
| format | Article |
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n-butylamine volumetry, cyclohexylamine thermodesorption, temperature-programmed desorption of ammonia and adsorption of pyridine. The nature, strength and concentration of the acid sites were determined and correlated to the results of a probe reaction of anthracene oxidation to 9,10-anthraquinone (in liquid phase). In general, the surface acidity was highly influenced by the nature, location and coordination of the metal species (Al and Ti) in the mesoporous samples. Moderate to strong Brönsted acid sites were identified for the Al-MCM-41 sample in a large temperature range. For mesoporous materials containing Ti, the acidity was represented by a combination of weak to moderate Brönsted and Lewis acid sites. The Ti-HMS sample exhibits a higher acidity of moderate strength together with a well-balanced concentration of Brönsted and Lewis acid sites, which enhanced both conversion and selectivity in the oxidation reaction of anthracene.</description><identifier>ISSN: 0169-4332</identifier><identifier>EISSN: 1873-5584</identifier><identifier>DOI: 10.1016/j.apsusc.2009.01.076</identifier><language>eng</language><publisher>Amsterdam: Elsevier B.V</publisher><subject>Adsorption and desorption kinetics; evaporation and condensation ; Brönsted ; Condensed matter: structure, mechanical and thermal properties ; Cross-disciplinary physics: materials science; rheology ; Exact sciences and technology ; HMS ; Lewis ; Materials science ; MCM ; Molecular nanostructures ; Nanoscale materials and structures: fabrication and characterization ; Physics ; Redox activity ; Solid-fluid interfaces ; Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties) ; Titanium</subject><ispartof>Applied surface science, 2009-04, Vol.255 (12), p.6205-6209</ispartof><rights>2009 Elsevier B.V.</rights><rights>2009 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c367t-cae1680ab4bdcb59db097669b68326d272dc2ccaa920b8c9ac6ad7852582da5c3</citedby><cites>FETCH-LOGICAL-c367t-cae1680ab4bdcb59db097669b68326d272dc2ccaa920b8c9ac6ad7852582da5c3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.apsusc.2009.01.076$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,780,784,3550,27924,27925,45995</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=21374715$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Araújo, Rinaldo S.</creatorcontrib><creatorcontrib>Maia, Débora A.S.</creatorcontrib><creatorcontrib>Azevedo, Diana C.S.</creatorcontrib><creatorcontrib>Cavalcante, Célio L.</creatorcontrib><creatorcontrib>Rodríguez-Castellón, E.</creatorcontrib><creatorcontrib>Jimenez-Lopez, A.</creatorcontrib><title>Assessment of surface acidity in mesoporous materials containing aluminum and titanium</title><title>Applied surface science</title><description>The surface acidity of mesoporous molecular sieves of aluminum and titanium was evaluated using four different techniques:
n-butylamine volumetry, cyclohexylamine thermodesorption, temperature-programmed desorption of ammonia and adsorption of pyridine. The nature, strength and concentration of the acid sites were determined and correlated to the results of a probe reaction of anthracene oxidation to 9,10-anthraquinone (in liquid phase). In general, the surface acidity was highly influenced by the nature, location and coordination of the metal species (Al and Ti) in the mesoporous samples. Moderate to strong Brönsted acid sites were identified for the Al-MCM-41 sample in a large temperature range. For mesoporous materials containing Ti, the acidity was represented by a combination of weak to moderate Brönsted and Lewis acid sites. The Ti-HMS sample exhibits a higher acidity of moderate strength together with a well-balanced concentration of Brönsted and Lewis acid sites, which enhanced both conversion and selectivity in the oxidation reaction of anthracene.</description><subject>Adsorption and desorption kinetics; evaporation and condensation</subject><subject>Brönsted</subject><subject>Condensed matter: structure, mechanical and thermal properties</subject><subject>Cross-disciplinary physics: materials science; rheology</subject><subject>Exact sciences and technology</subject><subject>HMS</subject><subject>Lewis</subject><subject>Materials science</subject><subject>MCM</subject><subject>Molecular nanostructures</subject><subject>Nanoscale materials and structures: fabrication and characterization</subject><subject>Physics</subject><subject>Redox activity</subject><subject>Solid-fluid interfaces</subject><subject>Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties)</subject><subject>Titanium</subject><issn>0169-4332</issn><issn>1873-5584</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2009</creationdate><recordtype>article</recordtype><recordid>eNp9kE1v2zAMhoVhBZZm_Qc96LLd7OnDlu3LgCBY2wEBeul6FWhKHhTYcibKA_rv5yBBjzvxwIcvyYexeylKKaT5dizhRAthqYToSiFL0ZgPbCPbRhd13VYf2WbFuqLSWn1it0RHIaRauxv2uiPyRJOPmc8DpyUNgJ4DBhfyGw-RT57m05zmhfgE2acAI3GcY4YQQ_zNYVymEJeJQ3Q8hwwxLNNndjOsnL-71i379fDjZf9UHJ4ff-53hwK1aXKB4KVpBfRV77CvO9eLrjGm602rlXGqUQ4VIkCnRN9iB2jANW2t6lY5qFFv2ddL7inNfxZP2U6B0I8jRL9ebHWljdS6XsHqAmKaiZIf7CmFCdKblcKeJdqjvUi0Z4lWSLtKXMe-XPOBEMYhQcRA77NK6qZq5Dn--4Xz67N_g0-WMPiI3oXkMVs3h_8v-gcMCow1</recordid><startdate>20090401</startdate><enddate>20090401</enddate><creator>Araújo, Rinaldo S.</creator><creator>Maia, Débora A.S.</creator><creator>Azevedo, Diana C.S.</creator><creator>Cavalcante, Célio L.</creator><creator>Rodríguez-Castellón, E.</creator><creator>Jimenez-Lopez, A.</creator><general>Elsevier B.V</general><general>Elsevier</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7QF</scope><scope>7SR</scope><scope>7U5</scope><scope>8BQ</scope><scope>8FD</scope><scope>JG9</scope><scope>L7M</scope></search><sort><creationdate>20090401</creationdate><title>Assessment of surface acidity in mesoporous materials containing aluminum and titanium</title><author>Araújo, Rinaldo S. ; 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thin films and whiskers (structure and nonelectronic properties)</topic><topic>Titanium</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Araújo, Rinaldo S.</creatorcontrib><creatorcontrib>Maia, Débora A.S.</creatorcontrib><creatorcontrib>Azevedo, Diana C.S.</creatorcontrib><creatorcontrib>Cavalcante, Célio L.</creatorcontrib><creatorcontrib>Rodríguez-Castellón, E.</creatorcontrib><creatorcontrib>Jimenez-Lopez, A.</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Aluminium Industry Abstracts</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 surface science</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Araújo, Rinaldo S.</au><au>Maia, Débora A.S.</au><au>Azevedo, Diana C.S.</au><au>Cavalcante, Célio L.</au><au>Rodríguez-Castellón, E.</au><au>Jimenez-Lopez, A.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Assessment of surface acidity in mesoporous materials containing aluminum and titanium</atitle><jtitle>Applied surface science</jtitle><date>2009-04-01</date><risdate>2009</risdate><volume>255</volume><issue>12</issue><spage>6205</spage><epage>6209</epage><pages>6205-6209</pages><issn>0169-4332</issn><eissn>1873-5584</eissn><abstract>The surface acidity of mesoporous molecular sieves of aluminum and titanium was evaluated using four different techniques:
n-butylamine volumetry, cyclohexylamine thermodesorption, temperature-programmed desorption of ammonia and adsorption of pyridine. The nature, strength and concentration of the acid sites were determined and correlated to the results of a probe reaction of anthracene oxidation to 9,10-anthraquinone (in liquid phase). In general, the surface acidity was highly influenced by the nature, location and coordination of the metal species (Al and Ti) in the mesoporous samples. Moderate to strong Brönsted acid sites were identified for the Al-MCM-41 sample in a large temperature range. For mesoporous materials containing Ti, the acidity was represented by a combination of weak to moderate Brönsted and Lewis acid sites. The Ti-HMS sample exhibits a higher acidity of moderate strength together with a well-balanced concentration of Brönsted and Lewis acid sites, which enhanced both conversion and selectivity in the oxidation reaction of anthracene.</abstract><cop>Amsterdam</cop><pub>Elsevier B.V</pub><doi>10.1016/j.apsusc.2009.01.076</doi><tpages>5</tpages></addata></record> |
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| subjects | Adsorption and desorption kinetics evaporation and condensation Brönsted Condensed matter: structure, mechanical and thermal properties Cross-disciplinary physics: materials science rheology Exact sciences and technology HMS Lewis Materials science MCM Molecular nanostructures Nanoscale materials and structures: fabrication and characterization Physics Redox activity Solid-fluid interfaces Surfaces and interfaces thin films and whiskers (structure and nonelectronic properties) Titanium |
| title | Assessment of surface acidity in mesoporous materials containing aluminum and titanium |
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