Abstract
Two modifying agents, citric acid and EDTA-2Na, were used to modify USY zeolite to obtain the hierarchical USY with high crystallinity. XRD, N2 isothermal sorption, 27Al and 29Si NMR, and TEM were adopted to characterize the dealumination process in the post-treatment of USY. The results showed that all modified USY have increased surface areas and pore volume due to the removal of non-framework Al species. Besides, framework dealumination occurred in the modification process. USY-EC, which was modified by the combined effects of citric acid and EDTA-2Na, has the highest SiO2/Al2O3 ratio of 19.40 and relatively high crystallinity.
Highlights
Zeolite-containing catalysts have been playing important roles in oil refining and petrochemical fields [1]
The results showed that all modified USY have increased surface areas and pore volume due to the removal of non-framework Al species
The calculation results from X-ray diffraction (XRD) analysis show that USY-E has higher crystallinity, while USY-C and USY-EC have slightly lower crystallinities compared with parent USY
Summary
Zeolite-containing catalysts have been playing important roles in oil refining and petrochemical fields [1]. Abstract Two modifying agents, citric acid and EDTA2Na, were used to modify USY zeolite to obtain the hierarchical USY with high crystallinity. XRD, N2 isothermal sorption, 27Al and 29Si NMR, and TEM were adopted to characterize the dealumination process in the post-treatment of USY.
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