Abstract
Using ZSM-5 zeolites as catalysts for the methanol to propylene (MTP) reaction is being widely investigated and has been industrially applied. In this study, pure ZSM-5 zeolite was successfully synthesized by a direct hydrothermal method using the fly ash of coal gasification as an additional raw material. Various analysis methods such as X-ray diffraction, N2 sorption, scanning electron microscopy, and infrared spectroscopy, were employed to characterize the physicochemical properties of parent and modified zeolites. Then, the prepared ZSM-5 catalysts were tested in the MTP reaction. The results showed that pure ZSM-5 could be directly synthesized in the optimized conditions using fly ash as additional silicon and aluminum sources, and those ZSM-5 catalysts turned out to be candidate catalysts for the MTP reaction. Whereas their catalytic lifetimes were not good enough due to the strong acid sites and needed improving.
Highlights
A large amount of fly ash has been generated from coal-based industries such as coal gasification and thermal power plants [1,2]
It shows that the fly ash was mainly composed of silicon oxide, alumina, and unreacted residual carbon
Nitric acid with fixed concentration of 2 mol/L was used for washing the raw fly ash
Summary
A large amount of fly ash has been generated from coal-based industries such as coal gasification and thermal power plants [1,2]. These solid wastes were disposed by landfill and caused environmental problems. It may soon be expensive to dispose of the fly ash owing to stricter legislative requirements. The reuse of coal fly ash has been pressing and attractive in the case of its important economic and environmental implications. Researchers have tried to use fly ash as the soil amendment, adsorbents, and building materials [3]. Considering its rich in silicon and aluminum sources, an alternative usage of fly ash is to synthesize the value-added zeolites
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