Structural and morphological transformation of NaX zeolite crystals at high temperature

Improving the ammonium ion uptake onto natural zeolite by using an integrated modification process

“…However, due to thermal stabilities of zeolites, high-temperature treatment can also induce dealumination and dehydroxylation of zeolites, and change the surface function groups and cause framework collapse, resulting in lower surface area and pore volume and leading to lower adsorption capacity [13,19,[22][23][24]. Furthermore, with increasing time and temperature of thermal treatment, the degree of crystallinity of original zeolite may decrease, and amorphous phase may be yielded [25,26]. The calcination-test results in this study were in agreement with these studies.…”

A New Type of BTP/Zeolites Nanocomposites as Mixed-Phase Fire Suppressant: Preparation,Characterization and Extinguishing Mechanism Discussion

“…In the temperature range of 30 to 700 °C, a weight loss of 22.7% was observed in pure zeolite, which was possibly due to the water molecules remaining in zeolite matrix [17]. While a weight loss of 27.4% occurred in the composite.…”

Novel zeolite Na-X synthesized from fly ash as a heterogeneous catalyst in biodiesel production

“…The morphology of the commercial Na-X (Fig. 4b) was found to contain the typical octahedral crystal formation of faujasite zeolites [25]. Fig.…”

“…The XRD patterns of the CM/Na-X and FA/Na-X show similar diffraction peaks except for an additional contaminant phase which results in reflections at 2e = 12 • , 14 • and 24 • in the FA/Na-X sample. Reports from literature state that faujasite zeolites X and Y are thermally stable [25] which make them potentially attractive as catalysts for transesterification reactions requiring moderate to elevated temperatures.…”