Acidity modifications of nanozeolite-Y for enhanced selectivity to olefins from the steam catalytic cracking of dodecane

Shafei, Emad N.; Masudi, Ahmad; Yamani, Zain H.; Muraza, Oki

doi:10.1039/d2ra02184f

Cited by 6 publications

(4 citation statements)

References 42 publications

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“…Figure shows the X-ray diffraction (XRD) pattern of the catalyst after modification with P in a series of weight loadings (0.5, 1, and 2 wt %). The XRD pattern of the parent zeolite as reported in our previous studies displays that the nanozeolite Y was grown in the (111) and (733) planes, which is similar to another report . The pattern in this study exhibits the same peak position but with different intensities.…”

Section: Resultssupporting

confidence: 89%

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: Resultssupporting

confidence: 89%

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

et al. 2022

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“…However, it can be anticipated that a combination of thermal desorption and spectroscopic analysis is powerful for acidity characterization. The reader can consult some of the cited references for further study on applications of this subject [20][21][22][23][24][25][26][27][28].…”

Section: Base-tpd (Temperature Programmed Desorption)mentioning

confidence: 99%

Liquid Phase Calorimetric Method as a Tool for Acid Strength Measurements and Application to a Variety of Sustainable Catalysts

et al. 2023

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It has been about 36 years since the first published paper about the calorimetry and adsorption (Cal-Ad) method by Prof. Drago. These separated methods are very old and important characterization tools for different molecules and materials, as recognized in chemistry. The idea of coupling these two techniques arose from the need to have more information about the thermodynamic parameters of a catalyst. The Cal-Ad method provides a measure of the magnitude (Ki), strength (−∆Hi), and quantity (ni) of sites present in a catalyst. The original idea is based on the application of the donor-acceptor concept using the Electrostatic Covalent Model, ECW in the areas of catalysis and material chemistry. Particularly, enthalpy measurements of acidity are directly related to the activity of various catalysts in a variety of reactions. Currently, more than twenty-five catalysts have been carefully characterized by this method in addition to spectroscopic and other thermal methods. Thus, this review seeks to present the fundamentals of the method and show different applications of the characterized catalysts for a variety of reactions in order to use these data as an alternative to choose a catalyst for an acid-dependent type reaction.

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“…17,22,23 Furthermore, nanoscale zeolites have shorter path lengths inside the pores compared with normal-sized zeolite crystals, and this leads to faster diffusion rates, allowing the product to diffuse faster without undergoing further secondary reactions. [23][24][25] Among these zeolites, nanoscale ZSM-5 showed the highest activity and pore-shape selectivity toward converting different hydrocarbons to olens. Corma et al 11 studied the steam catalytic cracking of wide-range of paraffin (C 5 -C 12 ) over ZSM-5 zeolite with crystal sizes ranging from 100 to 1000 nm.…”

Section: Introductionmentioning

confidence: 99%

Steam catalytic cracking and lump kinetics of naphtha to light olefins over nanocrystalline ZSM-5 zeolite

Al-Shafei,

Aljishi,

Shakoor

et al. 2023

RSC Adv.

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Acidity modifications of nanozeolite-Y for enhanced selectivity to olefins from the steam catalytic cracking of dodecane

Abstract: Nanozeolite Y for enhanced selectivity to olefins from dodecane cracking.

Cited by 6 publications

References 42 publications

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

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

Liquid Phase Calorimetric Method as a Tool for Acid Strength Measurements and Application to a Variety of Sustainable Catalysts

Steam catalytic cracking and lump kinetics of naphtha to light olefins over nanocrystalline ZSM-5 zeolite

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