Acidity of zeolite Y-probed by adsorption of 1-naphthylamine and studied by laser-induced fluorescence spectroscopy
Proton transfer reactions between zeolite Y surface and 1-naphthylamine (NA) in the ground and excited states have been studied by laser-induced picosecond spectroscopy. The acidic form of zeolite Y readily protonates NA in the ground state. At low acid strength of the zeolite the excited state of t...
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| Veröffentlicht in: | Catalysis letters 2002-03, Vol.78 (1-4), p.161-170 |
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| creator | EL-RAYYES, Ali A PERZANOWSKI, H. P KLEIN, Uwe K. A BARRI, Sami A. I |
| description | Proton transfer reactions between zeolite Y surface and 1-naphthylamine (NA) in the ground and excited states have been studied by laser-induced picosecond spectroscopy. The acidic form of zeolite Y readily protonates NA in the ground state. At low acid strength of the zeolite the excited state of the protonated NA transfers back the proton to the zeolite surface as indicated by the fluorescence spectra. At high acid strength of the zeolite the fluorescence comes from the protonated form of NA and from an adduct “X” previously found in highly concentrated HClO4 solutions. The concentrations of the protonated NA and X increase with the reduction in the unit cell size. The presence of these species is discussed in terms of the next nearest neighbor “NNN” theory of zeolite Y acidity and the role of the non-framework aluminum. The acidity of the zeolite is estimated, based on the fluorescence lifetimes of X, to vary from 3.7 to 17 M HClO4 depending on the unit cell size. Low loading levels of NA in the zeolite pores are best in studying the proton transfer reaction and for the estimation of the surface acidity of zeolite Y. |
| doi_str_mv | 10.1023/A:1014937724766 |
| format | Article |
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P ; KLEIN, Uwe K. A ; BARRI, Sami A. I</creator><creatorcontrib>EL-RAYYES, Ali A ; PERZANOWSKI, H. P ; KLEIN, Uwe K. A ; BARRI, Sami A. I</creatorcontrib><description>Proton transfer reactions between zeolite Y surface and 1-naphthylamine (NA) in the ground and excited states have been studied by laser-induced picosecond spectroscopy. The acidic form of zeolite Y readily protonates NA in the ground state. At low acid strength of the zeolite the excited state of the protonated NA transfers back the proton to the zeolite surface as indicated by the fluorescence spectra. At high acid strength of the zeolite the fluorescence comes from the protonated form of NA and from an adduct “X” previously found in highly concentrated HClO4 solutions. The concentrations of the protonated NA and X increase with the reduction in the unit cell size. The presence of these species is discussed in terms of the next nearest neighbor “NNN” theory of zeolite Y acidity and the role of the non-framework aluminum. The acidity of the zeolite is estimated, based on the fluorescence lifetimes of X, to vary from 3.7 to 17 M HClO4 depending on the unit cell size. Low loading levels of NA in the zeolite pores are best in studying the proton transfer reaction and for the estimation of the surface acidity of zeolite Y.</description><identifier>ISSN: 1011-372X</identifier><identifier>EISSN: 1572-879X</identifier><identifier>DOI: 10.1023/A:1014937724766</identifier><language>eng</language><publisher>Dordrecht: Springer</publisher><subject>Aluminum ; Catalysis ; Catalytic reactions ; Chemistry ; Exact sciences and technology ; Excitation ; General and physical chemistry ; Laser induced fluorescence ; Protons ; Spectroscopic analysis ; Spectrum analysis ; Theory of reactions, general kinetics. Catalysis. 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I</creatorcontrib><title>Acidity of zeolite Y-probed by adsorption of 1-naphthylamine and studied by laser-induced fluorescence spectroscopy</title><title>Catalysis letters</title><description>Proton transfer reactions between zeolite Y surface and 1-naphthylamine (NA) in the ground and excited states have been studied by laser-induced picosecond spectroscopy. The acidic form of zeolite Y readily protonates NA in the ground state. At low acid strength of the zeolite the excited state of the protonated NA transfers back the proton to the zeolite surface as indicated by the fluorescence spectra. At high acid strength of the zeolite the fluorescence comes from the protonated form of NA and from an adduct “X” previously found in highly concentrated HClO4 solutions. The concentrations of the protonated NA and X increase with the reduction in the unit cell size. The presence of these species is discussed in terms of the next nearest neighbor “NNN” theory of zeolite Y acidity and the role of the non-framework aluminum. The acidity of the zeolite is estimated, based on the fluorescence lifetimes of X, to vary from 3.7 to 17 M HClO4 depending on the unit cell size. Low loading levels of NA in the zeolite pores are best in studying the proton transfer reaction and for the estimation of the surface acidity of zeolite Y.</description><subject>Aluminum</subject><subject>Catalysis</subject><subject>Catalytic reactions</subject><subject>Chemistry</subject><subject>Exact sciences and technology</subject><subject>Excitation</subject><subject>General and physical chemistry</subject><subject>Laser induced fluorescence</subject><subject>Protons</subject><subject>Spectroscopic analysis</subject><subject>Spectrum analysis</subject><subject>Theory of reactions, general kinetics. Catalysis. 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I</creatorcontrib><collection>Pascal-Francis</collection><collection>ProQuest SciTech Collection</collection><collection>ProQuest Technology Collection</collection><collection>Materials Science & Engineering Collection</collection><collection>ProQuest Central UK/Ireland</collection><collection>ProQuest Central</collection><collection>Technology Collection</collection><collection>ProQuest One Community College</collection><collection>ProQuest Materials Science Collection</collection><collection>ProQuest Central Korea</collection><collection>SciTech Premium Collection</collection><collection>Materials Science Database</collection><collection>Materials Science Collection</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>ProQuest Central China</collection><jtitle>Catalysis letters</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>EL-RAYYES, Ali A</au><au>PERZANOWSKI, H. P</au><au>KLEIN, Uwe K. A</au><au>BARRI, Sami A. I</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Acidity of zeolite Y-probed by adsorption of 1-naphthylamine and studied by laser-induced fluorescence spectroscopy</atitle><jtitle>Catalysis letters</jtitle><date>2002-03</date><risdate>2002</risdate><volume>78</volume><issue>1-4</issue><spage>161</spage><epage>170</epage><pages>161-170</pages><issn>1011-372X</issn><eissn>1572-879X</eissn><abstract>Proton transfer reactions between zeolite Y surface and 1-naphthylamine (NA) in the ground and excited states have been studied by laser-induced picosecond spectroscopy. The acidic form of zeolite Y readily protonates NA in the ground state. At low acid strength of the zeolite the excited state of the protonated NA transfers back the proton to the zeolite surface as indicated by the fluorescence spectra. At high acid strength of the zeolite the fluorescence comes from the protonated form of NA and from an adduct “X” previously found in highly concentrated HClO4 solutions. The concentrations of the protonated NA and X increase with the reduction in the unit cell size. The presence of these species is discussed in terms of the next nearest neighbor “NNN” theory of zeolite Y acidity and the role of the non-framework aluminum. The acidity of the zeolite is estimated, based on the fluorescence lifetimes of X, to vary from 3.7 to 17 M HClO4 depending on the unit cell size. Low loading levels of NA in the zeolite pores are best in studying the proton transfer reaction and for the estimation of the surface acidity of zeolite Y.</abstract><cop>Dordrecht</cop><pub>Springer</pub><doi>10.1023/A:1014937724766</doi><tpages>10</tpages></addata></record> |
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| subjects | Aluminum Catalysis Catalytic reactions Chemistry Exact sciences and technology Excitation General and physical chemistry Laser induced fluorescence Protons Spectroscopic analysis Spectrum analysis Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry Unit cell Zeolites |
| title | Acidity of zeolite Y-probed by adsorption of 1-naphthylamine and studied by laser-induced fluorescence spectroscopy |
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