Effect of Zeolite-Y Modification on Crude-Oil Direct Hydrocracking

Ding, Lianhui; Sitepu, H.; Al-Bogami, Saad A.; Yami, Duhaiman; Tamimi, Mazin A.; Shaik, Kareemuddin; Sayed, Essam

doi:10.1021/acsomega.1c03029

Cited by 4 publications

(1 citation statement)

References 19 publications

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“…This type of hydrocarbon required a large pore size and high surface area. There are some methods to hinder this limitation, namely, by modification to mesoporous zeolites, hierarchical zeolites, and nanozeolites . Konno et al reported that nanosized zeolite was more stable in naphtha cracking with a higher olefin yield than microsized zeolite .…”

Section: Introductionmentioning

confidence: 99%

Steam Catalytic Cracking of n-Dodecane to Light Olefins over Phosphorous- and Metal-Modified Nanozeolite Y

et al. 2022

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Nanozeolite Y was synthesized without a template and modified with phosphorous (P) and metals. P was introduced via impregnation with different weight loadings (0.5, 1, and 2 wt %), while ion exchange was developed to introduce zirconium (Zr) and cobalt (Co). The physicochemical properties of the catalysts were characterized with X-ray diffraction (XRD), N 2 adsorption–desorption, temperature-programmed desorption of ammonia (NH 3 -TPD), and 27 Al and 31 P solid-state nuclear magnetic resonance (NMR). The parent nanozeolite Y showed an identical XRD pattern to that of a previous study, and the modified nanozeolite Y showed a lower crystallinity. The introduction of P altered tetrahedral Al to an octahedral coordination, which affected the catalyst acidity. Then, the catalyst was evaluated to produce olefins from n -dodecane at 550, 575, and 600 °C. The conversion, gas yield, and olefin yield increased with increasing temperature. The maximum olefin yield (63%) was achieved with the introduction of 1 wt % P with the highest selectivity to ethylene. The Co-modified nanozeolite altered the zeolite structure and exhibited similar activity to the P-modified one. Meanwhile, Zr-modified nanozeolite Y caused excessive metal distribution, blocked the porous structure of the zeolite, and then reduced the catalytic activity.

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Section: Introductionmentioning

confidence: 99%