Mordenite‐Type Zeolite from Waste Coal Fly Ash: Synthesis, Characterization and Its Application as a Sorbent in Metal Ions Removal

Abstract

Coal fly ash is a waste, obtained from the combustion of coal in thermal power plants. Fly ash is harmful and its disposal is the major issue from an environmental point of view. As fly ash contains silica and alumina, it is thought of interest to use it for the synthesis of porous material like zeolite. In this work, the focus is on the utilization of fly ash for the synthesis of Mordenite type zeolite and its application in the toxic metals removal from aqueous solution. Coal fly ash based Mordenite type zeolite (FZS H ) was synthesized by seed assisted hydrothermal synthetic method using fly ash as a source of silica and alumina instead of using pure silica and alumina. The resultant material was characterized by various techniques, such as SEM-EDX, XRD, TGA, FT-IR, solid state NMR, BET surface area, etc. The XRD patterns confirm the presence of Mordenite phase in the FZS H zeolite. The sorption behavior of Pb 2 + and Cd 2 + towards commercial Mordenite and FZS H Mordenite type zeolite is investigated and compared. Percentage uptake obtained using FZS H and commercial Mordenite zeolite sorbent was found quite similar. The kinetic and thermodynamic studies reveal the favourable and spontaneous nature of the sorption.

Tuning the catalytic acidity in Al2O3 nanofibers with mordenite nanocrystals for dehydration reactions

“…The XRD pattern for NaMOR shows diffraction peaks at 2 θ = 9.8° (200), 13.5° (111), 19.7° (330), 22.3° (150), 25.7° (202), 26.4° (350), 27.7° (511), and 31.0° (402) which match with those for MOR in the MOR (2 θ = 9.8°, 13.5°, 19.6°, 22.3°, 25.7°, 26.3°, 27.5°, and 30.9°). 86–88 HMOR presents similar diffraction peaks to NaMOR (2 θ = 9.8°, 13.5°, 19.7°, 22.4°, 25.7°, 26.4°, 27.7°, and 31°). No other crystallographic phases are observed for both samples.…”

Recent advances in the synthesis and applications of mordenite zeolite – review

“…Lankapati et al synthesized mordenite using waste coal y ash based on the concept of Lathiya et al used waste coal y ash as a solid acid catalyst by converting into sulfated y ash. 27,28 The authors (Lankapati et al) utilized the mordenite catalyst as an absorbent towards the removal of metal ions. They prepared mordenite zeolite using coal y ash based on the composition reported by Kim et al with some changes.…”

Ultrasonic Pretreatment as a Tool for the Preparation of Low-Defect Zeolite Mordenite

“…Mordenite (three-letter code MOR for framework type) can be used, in particular, as a sorbent for wastewater treatment. , Yet, the most important application of this structure is industrial catalysis: hydro-isomerization of light naphtha (C5–C6 paraffins) and aromatic processing (e.g., cumene production, ethylbenzene isomerization, toluene disproportionation) …”

“…3 Mordenite (three-letter code MOR for framework type 4 ) can be used, in particular, as a sorbent for wastewater treatment. 5,6 Yet, the most important application of this structure is industrial catalysis: hydro-isomerization of light naphtha (C5−C6 paraffins) and aromatic processing (e.g., cumene production, ethylbenzene isomerization, toluene disproportionation). 3 Similar to other zeolites, the catalytic properties of mordenite are inextricably linked to the specific features of its pore system; moreover, this structure is remarkably stable upon catalytic reaction conditions, e.g., high temperature.…”