Acidity and Acid Strength of Zeolite Catalysts
スポンサーリンク
概要
- 論文の詳細を見る
The influence of pretreatment temperature, silica-to-alumina mole ratio, the kind of cation and degree of cation exchange on the number of acid sites, and the acid strength of zeolite catalysts were examined by means of amine titration. Strong acid sites whose <I>H</I><SUB>0</SUB> function is lower than −8.2 were analyzed by ultraviolet spectroscopy. Though H-zeolites have fairly strong acid sites (−10.8<<I>H</I><SUB>0</SUB><−8.2), the number of acid sites decreases with the decrease of the silica-to-alumina mole ratio, as a result of the collapse of the zeolite structure. Ca-zeolites have an acid site distribution similar to that of H-zeolites only when the silica-to-alumina mole ratio is larger than 4.6. Only La-form Y-zeolite has strong acid sites (<I>H</I><SUB>0</SUB><−10.8). When the degree of La-exchange exceeds 85 mol%, zeolite shows an acid coloration even with dinitrotoluene with p<I>K<SUB>a</SUB></I>−12.8.
- 公益社団法人 日本化学会の論文
著者
-
Takahashi Hiroshi
Institute Of Industrial Science The University Of Tokyo
-
Tsutsumi Kazuo
Institute of Industrial Science, The University of Tokyo
-
Ikemoto Misako
Institute of Industrial Science, The University of Tokyo
関連論文
- CHANGES IN SURFACE PROPERTIES OF KAOLIN MINERAL IN DEALUMINATION PROCESS BY SULFURIC ACID TREATMENT
- CHANGES IN PORE STRUCTURE OF KAOLIN MINERAL BY SULFURIC ACID TREATMENT
- Diastereoselective Addition of Grignard Reagents to Chiral 1,3-Oxazolidines Having a N-Diphenylmethyl Substituent
- The preparation of mesoporous silica gel and the nature of the modification of its surface with organoalkoxysilane.
- Adsorption properties of pillar interlayered montmorillonite.
- Solid-state NMR studies on pillar-interlayered naturally-occurring montmorillonite.
- Direct measurement of the interaction energy between solids and gases. X. Acidic properties of hydroxyl sites of H-Y zeolite determined by high-temperature calorimetry.
- Direct measurement of the interaction energy between solids and gases. VI. Calorimetric studies on acidic properties of solid super acids prepared from silica-alumina.
- Determination of heats of adsorption of triphenylchloromethane from its hexane solution onto dehydrated silica-alumina surface.
- Direct measurement of the interaction energy between solids and gases. V. Change of the differential heats of adsorption of ammonia with specific poisoning on silica-alumina.
- Direct measurement of the interaction energy between solids and gases. III. Comparison of the calorimetric titation method with the amine titration method for the determination of acid strength distribution of silica-alumina surface.
- Direct measurement of interaction energy between solids and gases. VII. Heats of adsorption of carbon monoxide on Cu(II)-exchanged zeolites Y.
- The Formation of Metallic Silver in Silver-Form Zeolites
- Direct measurement of the interaction energy between solids and gases. XI. Calorimetric measurements of acidities of aluminum deficient H-Y zeolites.
- Direct Measurement of Interaction Energy between Solids and Gases. I. Heat of Adsorption of Ammonia on Zeolite
- Direct measurement of interaction energy between solids and gases. IV. Acidic and catalytic properties of amorphous and crystalline alumino-silicates.
- Heat of adsorption of ammonia on silica-alumina at low surface coverage.
- Acidity and Acid Strength of Zeolite Catalysts
- Studies of Surface Modification of Solids. III. Reaction of Silica with Trifluoroethanol
- Carbon-13 nuclear magnetic relaxation studies of benzene molecules adsorbed on the pillar interlayered montmorillonite.
- XRD characteristics of Na-ZSM-5 synthesized from an organic-free system.