Thermal Analysis of Zeolites

Preparation and Characterization of Zeolite Supported Fluoropalladium Oxalate Catalyst for Hydrodeoxygenation of Oleic Acid into Paraffinic Fuel

“…After the incorporation of the catalyst precursor and calcination, there is slight increment in the Si/Al ratio to 1.50. This is in consonance with an earlier report on zeolite NaA which showed that there is an inverse relationship between the amount of zeolitic water and the Si/Al ratio . As observed in the TGA profile (Supporting Information, Figure S1), calcination reduced both the physisorbed and the strongly bonded water, and this is further supported by the reduction in the amount of oxygen as shown in Table .…”

“…Figure S1 (Supporting Information) shows the result of thermal gravimetric analysis of Zeol and FPdOx/Zeol (before and after calcination) with three characteristics regions. For both Zeol and FPdOx/Zeol (before calcination) there exists a rapid weight loss up to 110–140 °C which was undoubtedly due to the release of physisorbed water. , The value of the physisorbed water appeared higher in the latter than in the former due to the high degree of hydration at the catalyst synthesis stage. The second region is due to the presence of strongly bonded water molecules that are present in the first coordination sphere and require heat treatment up to about 650 °C for their removal, and finally in the third region was the structural hydroxyl groups that will condense and dehydrate at temperatures above 650 °C .…”

Equilibrium Adsorption Study of CO2 and N2 on Synthesized Zeolites 13X, 4A, 5A, and Beta

“…As the temperature increased to 800 °C, a total weight loss of 13.9% was observed, which can be attributed to the desorption and/or dissociation of TEAOH from the zeolite structure. Because the weight losses at temperatures ranging from 220 to 350 °C can be due to TEAOH separation from the structure, as well as the weight losses at temperatures above 350 °C due to the dissociation of TEA + cations . In the DTG curve for this zeolite, two peaks can be observed.…”

“…Various thermal analysis methods were utilized to investigate the thermal behaviors of the synthesized samples (mass loss, thermal stability, etc.) at elevated temperatures in various atmospheres. , The most significant weight loss during the process of thermal analysis of the zeolites can be attributed to the reduction and discharge of water, which is present in two forms in the zeolite structures. Water in the form of moisture on the surfaces and in the cavities of zeolites is separated at low temperatures up to approximately 150 °C.…”

“…A single endotherm peak associated with water desorption can be seen at 194, 191, 224, and 118 °C for zeolites 13X, 4A, 5A, and beta, respectively. Typically, the existence of an exothermic peak in the high-temperature range of a DTA curve is associated with lattice collapse . The temperature at which this exothermic peak appears is an indicator for investigating the thermal stability of zeolite species.…”