Modified natural kaolin clay as an active, selective, and stable catalyst for methanol dehydration to dimethyl ether

El-Aal, Mohamed Abd; Said, Abd El‐Aziz A.; Abdalla, Mohamed; Goda, Mohamed N.

doi:10.1038/s41598-022-13349-0

Cited by 15 publications

(3 citation statements)

References 67 publications

(71 reference statements)

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“…To investigate the acidity and the acidic site strength of the catalysts, several methods have been reported [36]. Isopropanol decomposition has been considered as a chemical probe reaction for the determination of the acidity of the catalysts [7,24,37]. The product selectivity in this reaction was used as a monitor for the presence of acidic and basic sites on the surface of the metal oxide catalysts.…”

Section: Resultsmentioning

confidence: 99%

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: 99%

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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“…It was discovered that at specific temperatures, the (B) and (L) acid sites may hold onto PY 1 . Via the saturation of the acidic sites with PY and DMPY for 7 days after evacuation, the active acidic sites of the 10% Al 2 O 3 /SCBA catalyst were poisoned 1,22,32 . The results of the subsequent catalytic reaction of IPA using unsaturated and saturated catalyst at various reaction temperatures are depicted in Figure 5c.…”

Section: Resultsmentioning

confidence: 99%

“…1 Via the saturation of the acidic sites with PY and DMPY for 7 days after evacuation, the active acidic sites of the 10% Al 2 O 3 /SCBA catalyst were poisoned. 1,22,32 The results of the subsequent catalytic reaction of IPA using unsaturated and saturated catalyst at various reaction temperatures are depicted in Figure 5c. It demonstrates how PY saturating a catalyst slows down its ability to catalyze at higher temperatures.…”

Section: Surface Acidity Determinationmentioning

confidence: 99%

Promoted catalytic performance of sugarcane bagasse ash supported by γ‐alumina as efficient, stable, and ecofriendly catalyst for dehydration of methanol to dimethyl ether

Said,

Goda,

Abd El‐Wahab

et al. 2024

Asia-Pacific J Chem Eng

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The aim of this study was to use different proportions (1% to 20% by weight) of γ‐alumina to modify sugarcane bagasse ash (SCBA) for the production of dimethyl ether (DME) through the dehydration of methyl alcohol. A simple precipitation method was utilized to fabricate (1–20 wt.%) Al2O3/SCBA catalysts. X‐ray fluorescence, X‐ray diffraction, Fourier‐transform infrared spectroscopy, transmission electron microscopy, and N2 sorption were used to explore the structural, spectroscopic, morphological, and textural features. The XRD pattern of Al2O3/SCBA catalysts showed a new peak that corresponded to the formation of γ‐Al2O3. In addition, the average crystallite sizes of pure SCBA and 10% and 20%Al2O3/SCBA catalysts were calculated and found to be 20.1, 21.6, and 22.6 nm, respectively. To evaluate the acidity of these catalysts, the dehydration of isopropyl alcohol and the chemisorption of basic probe molecules were employed. The acidity test results displayed that these catalysts have weak to moderate acidic sites. The 10% Al2O3/SCBA catalyst calcined at 400°C showed high efficiency for the conversion of methyl alcohol to DME, attaining 89% conversion with 100% selectivity. This observation can be attributed to the even distribution of active sites and the acid–base equilibrium on the surface. Moreover, its catalytic activity and selectivity remain unchanged over a continuous 2‐week operation without coke formation, demonstrating its extremely high stability. A strong correlation was observed between the catalytic activity and both the surface area and acidity of the catalysts.

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Significance of the formation of pentahedral aluminum in the reactivity of calcined kaolin/metakaolin and its applications

Moya,

Cabal,

Lopez-Esteban

et al. 2024

Ceramics International

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Modified natural kaolin clay as an active, selective, and stable catalyst for methanol dehydration to dimethyl ether

Cited by 15 publications

References 67 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

Promoted catalytic performance of sugarcane bagasse ash supported by γ‐alumina as efficient, stable, and ecofriendly catalyst for dehydration of methanol to dimethyl ether

Significance of the formation of pentahedral aluminum in the reactivity of calcined kaolin/metakaolin and its applications

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