Acidity characterization of tungstophosphoric acid supported MCM-41 materials using laser induced fluorescence spectroscopy

被引:2
作者
El-Rayyes, AA
Klein, UKA
机构
[1] King Fahd Univ Petr & Minerals, Dept Chem, Dhahran 31261, Saudi Arabia
[2] King Fahd Univ Petr & Minerals, Res Inst, Laser Res Sect, Dhahran 31261, Saudi Arabia
关键词
D O I
10.1016/j.cplett.2004.09.015
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Excited state proton transfer reactions of 1-naphthylamine (R-NH2) adsorbed at the surfaces of tungstophosphoric acid supported MCM-41 materials have been studied using steady state fluorescence and picosecond time correlated single photon counting techniques. Evidence for the formation of X* (an adduct between the R-NH2 and the acid) showed strongly enhanced surface acidity of the supported MCM-41 materials. The excited state lifetime of X* was used to estimate the surface acidity which was found to be between 9.3 and 10.4 M acidic solution depending upon the solvent used in the loading experiment. (C) 2004 Elsevier B.V. All rights reserved.
引用
收藏
页码:484 / 487
页数:4
相关论文
共 27 条
[1]   INORGANIC SOLID ACIDS AND THEIR USE IN ACID-CATALYZED HYDROCARBON REACTIONS [J].
CORMA, A .
CHEMICAL REVIEWS, 1995, 95 (03) :559-614
[2]   The solid acidity of 12-tungstophosphoric acid [J].
Dias, JA ;
Osegovic, JP ;
Drago, RS .
JOURNAL OF CATALYSIS, 1999, 183 (01) :83-90
[3]   Zeolite-filled PDMS membranes .2. Pervaporation of halogenated hydrocarbons [J].
Dotremont, C ;
Vankelecom, IFJ ;
Morobe, M ;
Uytterhoeven, JB ;
Vandecasteele, C .
JOURNAL OF PHYSICAL CHEMISTRY B, 1997, 101 (12) :2160-2163
[4]   An acidity scale for Bronsted acids including H3PW12O40 [J].
Drago, RS ;
Dias, JA ;
Maier, TO .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1997, 119 (33) :7702-7710
[5]   Acidity of all-silica MCM-41 - studied by laser spectroscopy of adsorbed fluorescent probe compounds [J].
El-Rayyes, AA ;
Al-Arfaj, A ;
Klein, UKA ;
Barri, SAI .
CATALYSIS LETTERS, 2004, 97 (1-2) :83-90
[6]   Acidity of zeolite Y - Probed by adsorption of 1-naphthylamine and studied by laser-induced fluorescence spectroscopy [J].
El-Rayyes, AA ;
Perzanowski, HP ;
Klein, UKA ;
Barri, SAI .
CATALYSIS LETTERS, 2002, 78 (1-4) :161-170
[7]   New insight into the excited-state proton-transfer reactions of 1-naphthylamine in solution [J].
El-Rayyes, AA ;
Perzanowski, HP ;
Barri, SAI ;
Klein, UKA .
JOURNAL OF PHYSICAL CHEMISTRY A, 2001, 105 (45) :10169-10175
[8]  
ELRAYYES AA, 2001, THESIS KFUPM
[9]  
HITE P, 1986, J PHYS CHEM-US, V90, P5295
[10]  
IZUMI Y, 1992, HETEROPOLY ACID ORGA