Effect of sulphate groups on catalytic properties of chromium supported by zirconia in the n-hexane aromatization

Raissi, Sahar; Younes, Mohamed Kadri; Ghorbel, Abdelhamid; Garin, F.

doi:10.1007/s10971-009-2113-0

Cited by 5 publications

(2 citation statements)

References 23 publications

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“…The use of the La−Cr/ZrO 2 catalyst produced ortho-xylene and ethylbenzene as the major products. The aromatization of n-C 6 was performed 153 over Cr/sulfated-ZrO 2 . The dispersed Cr 3+ was the active species, whereas the acidity generated by the sulfate groups acted as a coke eliminator.…”

Section: Transition Metal Oxidesmentioning

confidence: 99%

Review on the Catalytic Conversion of Naphtha to Aromatics: Advances and Outlook

et al. 2023

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Naphtha is the main feedstock used in the production of gasoline and benzene, toluene, and xylene (BTX) aromatics, which are widely applied as chemical intermediates in the fields of packaging, synthetic fibers, and solvents. This article reviews the recent literature regarding the catalytic conversion of naphtha to higher-value BTX in terms of catalysts used, catalyst properties, reaction mechanisms, kinetic modeling, operating conditions, and product selectivity. Most studies focused on ZSM-5 and ZSM-5 modified using Ga, Zn, Ni, Co, Cu, Fe, Mo, W, Sn, etc. The promoting effects of metals and catalyst properties on naphtha conversion and the selectivity toward aromatics were critically analyzed. Pt-promoted zeolite L exhibited an excellent catalytic performance in naphtha aromatization for the selective production of benzene using n-hexane. Other studies investigated different types of zeolites, such as ZSM-11, BEA, X, Y, MOR, ZRP, and TsVM high-silica zeolites, with distinct properties. Nonzeolitic catalysts included Pt, Re, and Sn supported on Al 2 O 3 ; activated carbon; and mesoporous silicates (MCM-41 and SBA-15). Finally, the challenges and perspectives of naphtha aromatization related to emerging naphtha types, cofeeding, and improved catalysts are highlighted.

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Section: Transition Metal Oxidesmentioning

confidence: 99%

Review on the Catalytic Conversion of Naphtha to Aromatics: Advances and Outlook

et al. 2023

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“…The results revealed that this catalytic system is very performing [6][7][8][9]. Thanks to their hydrogenatingdehydrogenating and redox properties, transition metals can constitute an interesting alternative to the expensive platinum [10][11][12]. Good control of the preparation conditions is decisive.…”

Section: Introductionmentioning

confidence: 97%

Effect of drying conditions on the textural, structural and catalytic properties of Cr/ZrO2–SO4: n-hexane conversion

Raissi

Kamoun

Younes

et al. 2015

Reac Kinet Mech Cat

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Aerogel and xerogel catalysts based on sulfated zirconia doped with chromium are prepared by sol-gel method. The effects of drying mode and calcination temperature are reflected in the characteristics of the final solids. The addition of chromium to aerogel sulfated zirconia not only provides an important development of the specific surface area from 100 to 213 m 2 g -1 ; but also stabilizes a pure metastable ZrO 2 tetragonal phase in a large calcination temperature domain. In addition, the aerogels develop active sulfate groups and preserve them on the surface even at high heating. Those characteristics contribute to the improvement of catalytic performances of sulfated zirconia in n-hexane conversion. However, in the case of xerogels, the increase of temperature treatment leads to the loss of sulfate active groups and porosity destruction which make them completely inactive in spite of the development of ZrO 2 tetragonal phase.

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Zirconia Aerogels

Ben Hammouda,

Mejri,

Younes

et al. 2023

Springer Handbooks

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Effect of sulphate groups on catalytic properties of chromium supported by zirconia in the n-hexane aromatization

Cited by 5 publications

References 23 publications

Review on the Catalytic Conversion of Naphtha to Aromatics: Advances and Outlook

Review on the Catalytic Conversion of Naphtha to Aromatics: Advances and Outlook

Effect of drying conditions on the textural, structural and catalytic properties of Cr/ZrO2–SO4: n-hexane conversion

Zirconia Aerogels

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