Determination of Ca/NaY zeolite acidity by TG and DSC

Abstract

The acid properties of the Ca/NaY zeolite were investigated by means of n-butylamine desorption and thermal decomposition, using both thermogravimetry (TG) and differential scanning calorimetry (DSC). The total acidity of the zeolite was calculated from the TG data, while DSC was used with the Borchardt-Daniels kinetic model to determine the relative acid strength of the catalyst, given in J per acid site. The enthalpies of these processes are proportional to the acid site strength in each specific temperature range.

Catalytic Conversion of Palm Oil to Hydrocarbons: Performance of Various Zeolite Catalysts

“…(c) Acid Strength Measurements. Thermal gravimetric analysis (TGA) was used to determine the strength of the acid sites formed over the catalyst . The thermal gravimetric analyzer (TGA 7) was supplied by Perkin-Elmer, and it was coupled with a TG controller (TAC 7/DX).…”

“…Thermal gravimetric analysis (TGA) was used to determine the strength of the acid sites formed over the catalyst. 14 The thermal gravimetric analyzer (TGA 7) was supplied by Perkin-Elmer, and it was coupled with a TG controller (TAC 7/DX). The TGA was used to determine the concentration of acid sites through adsorption-desorption of isopropylamine (an organic base) by monitoring the weight changes that occur.…”

A novel Ag-loaded 4 Å zeolite as an efficient catalyst for epoxidation of styrene

“…The thermal weight loss ratio of 4.74% in the range of 175 °C to 500 °C is due to a surface transformation of the surface species. 58 After 500 °C, there is almost no weight loss, and the crystal morphology and the peaks of XRD patterns hardly change after the thermogravimetric analysis at 800 °C as shown in Fig. 10 , which shows that the high temperature thermal stability of the sample was excellent, overcoming the shortcomings of poor thermal stability generally associated with mesoporous zeolites and facile agglomeration of silver at high temperatures.…”

“…The thermal weight loss ratio of 4.74% in the range of 175 °C to 500 °C is due to a surface transformation of the surface species. 58 Aer 500 °C, there is almost no weight loss, and the crystal morphology and the Fig. 9 The thermogravimetric analysis of Z-Ag1.5.…”

Determination of Acid/Base Properties by Temperature Programmed Desorption (TPD) and Adsorption Calorimetry

“…The acidic properties of calcium-exchanged Na-Y zeolite were also investigated by means of n-butylamine desorption using differential scanning calorimetry [190]. The enthalpies of these processes were shown to be proportional to the acid strength in each specific temperature range.…”