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Adjusting the Acid Strength of Hybrid Solid Acids in Confined Nanospace.
- Source :
-
Topics in Catalysis . Dec2016, Vol. 59 Issue 19/20, p1748-1756. 9p. 3 Black and White Photographs, 2 Diagrams, 2 Charts, 5 Graphs. - Publication Year :
- 2016
-
Abstract
- The acid strength is one of the most important issues in solid acid. Herein, we report an efficient strategy for controlling the acid strength of sulfonated polystyrene (PS-SOH) within mesosilica hollow nanospheres. The sulfonation of PS@SiO core-shell nanospheres with surfactant un-removed, partially removed and totally removed results in the formation of PS-SOH@SiO with core-shell, yolk-shell and hollow nanostructures, respectively. The results of P MAS NMR using triethylphosphine oxide as a base probe molecule show that the acid strength of solid acids depends on their nanostructures. The yolk-shell and hollow nanostructures respectively afford the strongest and the weakest acid strength, suggesting the different aggregation degree of PS-SOH confined in nanospace during the sulfonation process. All the solid catalysts afford much higher activity than Amberlyst resin in esterification reaction. The yolk-shell nanostructured solid acid with the strongest acid strength shows the highest activity, suggesting the positive effect of the acid strength on the catalytic activity. [ABSTRACT FROM AUTHOR]
- Subjects :
- *POLYSTYRENE
*SULFONATION
*SILICA
*NANOSTRUCTURES
*PHOSPHINE oxides
Subjects
Details
- Language :
- English
- ISSN :
- 10225528
- Volume :
- 59
- Issue :
- 19/20
- Database :
- Academic Search Index
- Journal :
- Topics in Catalysis
- Publication Type :
- Academic Journal
- Accession number :
- 119808198
- Full Text :
- https://doi.org/10.1007/s11244-016-0696-6