Comparison of Acidity Test Method of Nickel Phosphate Silica Catalyst for Production Levulinic Acid from Glucose

The reaction of levulinic acid production from glucose has a stage that requires high temperature and activation energy so in this catalyst is needed. required must have lewis site bronsted the acidity very influential for successful levulonic acid. Silica nickel phosphate catalysts sites Ni metal phosphoric silica groups. was measured using pyridine ammonia adsorption method center strength TGA-DTA base adsorption-desorption. uses gravimetric it can easily obtain amount total surface while shows actual catalyst, which real state when catalyzing catalyst's resistance to temperatures. These two methods measuring same disadvantage they cannot show know number sites.