The optimum conditions for methanol conversion to dimethyl ether over modified sulfated zirconia catalysts prepared by different methods

El-Desouki, Doaa S.; Ibrahim, Amina H.; Abdel-Azim, Samira M.; Aboul-Gheit, Noha A.K.; Abdel-Hafizar, Dalia R.

doi:10.1016/s1872-5813(21)60009-9

Cited by 8 publications

(4 citation statements)

References 27 publications

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“…The weak and intermediate strength of the acid sites on the catalyst surface is confirmed by this behavior [41,42]. These acid sites are created due to the interaction between the sulfate groups and the metal oxide surface [43].…”

Section: Resultsmentioning

confidence: 87%

Zirconia–sugarcane bagasse fly ash as a novel solid acid nanocatalyst for selective dehydration of methanol to dimethyl ether

Abd El‐Aal,

Goda,

Abd El‐Wahab

et al. 2024

J Chinese Chemical Soc

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In the current study, two series of catalysts were synthesized and characterized by various physicochemical techniques. In the first series of catalysts, a chemical precipitation method was used for loading 1–20 wt. % ZrO2 on the surface of sugarcane bagasse fly ash (SCBFA) with the goal of finding out the optimal ZrO2 loading. In the second series, the 20% ZrO2/SCBFA composition was modified by (1–10 wt. %) SO42− by wet impregnation method. The acidity of these catalysts was determined through the dehydration of isopropyl alcohol and the chemisorption of pyridine and 2,6‐dimethyl pyridine. The catalytic efficiency for the dehydration of methanol to dimethyl ether (DME) in a fixed‐bed reactor at atmospheric pressure was investigated. A ~ 95% yield toward DME is maximized over the 10% SO42−/20% ZrO2/SCBFA catalyst at a reaction temperature of 400°C. Additionally, it maintained nearly the same efficiency over a 90‐h period and demonstrated outstanding long‐term stability. The specific surface area and the acidity are the most important factors responsible for enhancing the catalytic performance in this reaction. Our study reflects that SCBFA‐supported zirconia and that modified with SO42− are low‐cost, effective, eco‐friendly, and recyclable catalysts that are highly suited to apply for production of DME from methanol.

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Section: Resultsmentioning

confidence: 87%

Zirconia–sugarcane bagasse fly ash as a novel solid acid nanocatalyst for selective dehydration of methanol to dimethyl ether

Abd El‐Aal,

Goda,

Abd El‐Wahab

et al. 2024

J Chinese Chemical Soc

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“…Sulfation is a method that can increase the strength of ZrO 2 acid through the formation of Brønsted acids on the zirconia substrate that consequently increases its catalytic activity. ZrO 2 -SO 4 can be prepared from sulfate precursors such as H 2 SO 4 , (NH 4 ) 2 SO 4 , (NH 4 ) 2 S 2 O 3 , and (NH 4 ) 2 S) [24][25][26].…”

Section: Zro 2 -So 4 Catalystmentioning

confidence: 99%

Recent Progress on Sulfated Nanozirconia as a Solid Acid Catalyst in the Hydrocracking Reaction

et al. 2022

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Zirconia has advantageous thermal stability and acid–base properties. The acidity character of ZrO2 can be enhanced through the sulfation process forming sulfated zirconia (ZrO2-SO4). An acidity test of the catalyst produced proved that the sulfate loading succeeded in increasing the acidity of ZrO2 as confirmed by the presence of characteristic absorptions of the sulfate group from the FTIR spectra of the catalyst. The ZrO2-SO4 catalyst can be further modified with transition metals, such as Platinum (Pt), Chromium (Cr), and Nickel (Ni) to increase catalytic activity and catalyst stability. It was observed that variations in the concentrations of Pt, Cr, and Ni produced a strong influence on the catalytic activity as the acidity and porosity of the catalyst increased with their addition. The activity, selectivity, and catalytic stability tests of Pt/ZrO2-SO4, Cr/ZrO2-SO4 and Ni/ZrO2-SO4 were carried out with their application in the hydrocracking reaction to produce liquid fuel. The percentage of liquid fractions produced using these catalysts were higher than the fraction produced using pure ZrO2 and ZrO2-SO4 catalyst.

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“…Sulfated zirconia with adding 1%Mn by sol-gel (Mn/SZ-S) and impregnation method (Mn/SZ-I) on the methanol conversion process was tested by El-Desouki et al, and it was found that Mn/SZ SZ-S catalyst has better catalytic performance [139]. High catalytic activity has been attributed to high surface area and high acidity due to the high Lewis acidity of zirconium sulfate.…”

Section: Core Catalystmentioning

confidence: 99%

Direct catalytic production of dimethyl ether from CO and CO2: A review

Akhoondi

Osman

Eslami³

2021

Synth. Sinter.

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Dimethyl ether (DME) is a synthetically produced alternative fuel to diesel-based fuel and could be used in ignition diesel engines due to increasing energy demand. DME is considered extremely clean transportation and green fuel because it has a high cetane number (around 60), low boiling point (−25 °C), and high oxygen amount (35 wt%) which allow fast evaporation and higher combustion quality (smoke-free operation and 90% fewer NOx emissions) than other alternative CO2-based fuels. DME can be synthesized from various routes such as coal, petroleum, and bio-based material (i.e., biomass and bio-oil). Dimethyl ether can be produced from CO2 to prevent greenhouse gas emissions. This review aims to summarize recent progress in the field of innovative catalysts for the direct synthesis of dimethyl ether from syngas (CO+H2) and operating conditions. The problems of this process have been raised based on the yield and selectivity of dimethyl ether. However, regardless of how syngas is produced, the estimated total capital and operating costs in the industrial process depend on the type of reactor and the separation method.

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The optimum conditions for methanol conversion to dimethyl ether over modified sulfated zirconia catalysts prepared by different methods

Cited by 8 publications

References 27 publications

Zirconia–sugarcane bagasse fly ash as a novel solid acid nanocatalyst for selective dehydration of methanol to dimethyl ether

Zirconia–sugarcane bagasse fly ash as a novel solid acid nanocatalyst for selective dehydration of methanol to dimethyl ether

Recent Progress on Sulfated Nanozirconia as a Solid Acid Catalyst in the Hydrocracking Reaction

Direct catalytic production of dimethyl ether from CO and CO2: A review

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