Zeolite P with the pseudo-spherical form was successfully synthesised from low-grade fly ash via alkali-dissolving hydrothermal synthesis method. These samples were characterised by X-ray diffraction, scanning electron microscope, X-ray fluorescence, Fourier-transform infrared spectroscopy, thermogravimetry-differential scanning calorimeter (TG-DSC) and Brunauer-Emmett-Teller. The textural properties of zeolite P were further studied by N-2 adsorption-desorption technique. In addition, the TG-DSC study confirmed that the bound water content of zeolite P is 19.7% and the phase transition temperature of zeolite P is 400 degrees C. Moreover, this thermal stability study approach not only extends the application of zeolite P but can be further extended to other zeolite materials as well.

dissolving; crystal growth from solution; thermal stability; adsorption; scanning electron microscopy; zeolites; fly ash; desorption; X-ray diffraction; differential scanning calorimetry; Fourier transform infrared spectra; fluorescence; solid-state phase transformations; alkali-dissolving hydrothermal synthesis; zeolite P; fly ash; pseudospherical form; X-ray diffraction; X-ray fluorescence; Fourier-transform infrared spectroscopy; zeolite materials

GuiZhou University; Lanzhou University of Technology