Synthesis of ZSM-5 with the silica source from industrial Hexafluorosilicic acid (cas 16961-83-4) as transalkylation catalyst

Add time:08/05/2019    Source:sciencedirect.com

A new effective process to improve the utilization of industrial fluorosilicic acid of phosphate fertilizer by-product has been investigated to comprehensive application of the silicon and fluorine source. Two-step ammoniation was applied to recover high-quality silica. The recovered silica can be used to hydrothermal synthesize ZSM-5 zeolite without impurity phase contamination, which was confirmed by XRD, TG, SEM, BET and EDS characteristic techniques. It was found that with the increase of SiO2/Al2O3 ratio and the extension of reaction time, the crystal type transform from the orthorhombic to the monoclinic phase. The impurity fluorine content of the recovered SiO2 from H2SiF6 has great influence on the hydrothermal process for ZSM-5 crystal structure formation. Moreover, the increase of fluorine ions content in the hydrothermal process can control the crystal morphology and size of synthesized ZSM-5. Catalytic properties of synthesized HZSM-5 with different SiO2/Al2O3 ratio in transalkylation of toluene and 1,2,4-trimethylbenzene show good and stable catalytic performance. The ZSM-5 synthesized with recovered silica source exhibits similar catalyst life as the performance of small particle size HZSM-5, because the ZSM-5 synthesized with the silica source from industrial Hexafluorosilicic acid (cas 16961-83-4) prefers a thin disk crystal along the b axis direction, which shortens the diffusion distance of generated products.

We also recommend Trading Suppliers and Manufacturers of Hexafluorosilicic acid (cas 16961-83-4). Pls Click Website Link as below: cas 16961-83-4 suppliers

Prev:Reaction between calcium phosphate and fluoride in phosphogypsum
Next:Synthesis of titanium containing MCM-41 from industrial Hexafluorosilicic acid (cas 16961-83-4) as epoxidation catalyst)