Wang, Hong-hong published the artcileSynthesis and catalytic esterification of a novel solid acid catalyst 3-pyridine sulfonic acid-phosphomolybdic acid, Category: pyridine-derivatives, the publication is Huaxue Shiji (2016), 38(6), 506-510, database is CAplus.
A novel solid acid was synthesized by the reaction of 12-molybdophosphoric acid (HPM) with 3-pyridine sulfonic acid (PSA) and confirmed by X-ray powder diffraction, FT-IR, TG and potentiometric titration Then the solid acid was employed for esterification to evaluate its acid-catalytic activity. Various reaction parameters, including methanol/oleic acid molar ratio, catalyst dosage, reaction temperature and time were systematically examined These results indicated that the prepared catalyst maintained the Keggin structure of the raw HPM, and exhibited good thermal stability and higher acidity. The catalyst exhibited excellent catalytic activity in esterification and good reusability. 96.5% Conversion of oleic acid was obtained under the following conditions: mole ratio of alc. to acid 7:1, the reaction temperature 80°C, catalyst amount 10 wt% of the weight of oleic acid and the reaction time 5 h. After the fourth recycling, there was no obvious change in phase and Keggin structure for the catalysts.
Huaxue Shiji published new progress about 636-73-7. 636-73-7 belongs to pyridine-derivatives, auxiliary class Pyridine,Sulfonic acid, name is Pyridine-3-sulfonic acid, and the molecular formula is C9H22OSi, Category: pyridine-derivatives.
Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem