Measurements of Acid-strength Distribution beyond <I>H</I><SUB>0</SUB>=−8.2 of Silica-Alumina Catalysts by UV-Spectrophotometric <I>n</I>-Butylamine Titration Method
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概要
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A new UV-spectrophotometric <I>n</I>-butylamine titration method was proposed for measuring acid-strength distribution of acid sites on solid acid catalysts. The method can provide information on acid-strength distribution of acid sites beyond <I>H</I><SUB>0</SUB>=−8.2, which can not be obtained by the conventional visual <I>n</I>-butylamine titration method. Acid-strength distributions were measured for a series of silica-alimina catalysts differing in sodium content, using 4-benzeneazodiphenylamine (p<I>K<SUB>a</SUB></I>=1.5), <I>trans</I>-benzalacetophenone (p<I>K<SUB>a</SUB></I>=−5.6), 4-nitrotoluene (p<I>K<SUB>a</SUB></I>=−10.5), and 2,4-dinitrotoluene (p<I>K<SUB>a</SUB></I>=−12.8) as indicators. The results revealed that about one-half of the acid sites on an unpoisoned silica-alumina catalyst lay in the <I>H</I><SUB>0</SUB> region from −10.5 to −12.8, and the strongest ones in the <I>H</I><SUB>0</SUB> region beyond −12.8. The strong acid sites were eliminated with the modification of acid-strength distribution as the catalyst was poisoned with sodium ions. UV spectra of the above indicators in adsorbed state were discussed.
- 公益社団法人 日本化学会の論文
著者
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Yoneda Yukio
Department Of Molecular Pharmacology Kanazawa University Faculty Of Pharmaceutical Sciences
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Sato Tetsuo
Departmelet Of Organic Chemistry Tokyo Institute Of Technology Ookayama
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Sato Tetsuo
Department of Synthetic Chemistry, Faculty of Engineering, The University of Tokyo
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Take Jun-ichiro
Department of Synthetic Chemistry, Faculty of Engineering, The University of Tokyo
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Tsuruya Tetsuo
Department of Synthetic Chemistry, Faculty of Engineering, The University of Tokyo
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