Structural characterization of sulfated zirconia and their catalytic activity in dehydration of ethanol

Ahmed, Awad I.; El-Hakam, S.A.; Samra, S.E.; El-Khouly, A.; Khder, Abd El Rahman S.

doi:10.1016/j.colsurfa.2007.09.043

Cited by 73 publications

(40 citation statements)

References 58 publications

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“…It is well known that ethanol dehydration to ethylene is catalyzed by various solid acid catalysts [5], and the surface acidity of catalysts is usually used to estimate their catalytic performance on ethanol dehydration to ethylene [3][4][5][6][7][8][9]. NH 3 -TPD was adopted to characterize the surface acidic properties of the catalysts in this work.…”

Section: Resultsmentioning

confidence: 99%

Catalytic Dehydration of Ethanol to Ethylene on TiO2/4A Zeolite Composite Catalysts

Yao

Yuan

et al. 2009

Catal Lett

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TiO 2 /4A zeolite composite catalysts were prepared by coating TiO 2 on 4A zeolite via liquid phase deposition. The TiO 2 /4A zeolite composite catalysts wtih higher surface weak acidity and lower mediate strong acidity exhibit much better catalytic performance on ethanol dehydration to ethylene compared with 4A zeolite. It is suggested that the TiO 2 promoter could improve the effective Lewis acidity of composite catalyst which consequently enhanced the catalytic performance.

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Section: Resultsmentioning

confidence: 99%

Catalytic Dehydration of Ethanol to Ethylene on TiO2/4A Zeolite Composite Catalysts

Yao

Yuan

et al. 2009

Catal Lett

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“…Ethanol, for example, can be converted to a variety of different products over a metal oxide and three examples are provided in Table 1. [1][2][3] Solid acid catalysts, such as zeolites, 4-8 alumina, [9][10][11][12][13] and zirconia, [14][15][16] selectively dehydrate ethanol to form ethylene. 6,17 Acid sites on these catalysts eliminate water through protonation of the ethanol hydroxyl group or stabilization of surface alkoxides, followed by the elimination of a methyl proton and subsequent ethene desorption.…”

Section: Introductionmentioning

confidence: 99%

DRIFTS of Probe Molecules Adsorbed on Magnesia, Zirconia, and Hydroxyapatite Catalysts

et al. 2015

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Acid sites, base sites and acid-base site pairs on zirconia, magnesia and hydroxyapatite were investigated using diffuse reflectance FT-IR spectroscopy (DRIFTS) to evaluate the interaction of various adsorbed probe molecules with their surfaces. The DRIFTS spectra were recorded under continuous flow conditions at atmospheric total pressure during a temperature-programmed thermal ramp. Lewis acidity was assessed by observing the various pyridine ring mode conformations and the peak shift associated with adsorption of CO. Basicity was probed by the adsorption of CO 2 to form carbonates and bicarbonates on the samples. The acid-base bifunctional nature of the oxides was explored by adsorption of acetylene and glycine. As expected, zirconia exposed the strongest Lewis acid sites of the three samples whereas magnesia exhibited the strongest basic sites. In contrast, hydroxyapatite had a poor affinity for all probe molecules used in this study based on temperature-programmed desorption experiments, indicating the presence of only weak acid and base sites on the surface, which might account for its high catalytic activity and unique selectivity in the Guerbet coupling of ethanol to butanol.

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“…However, these heterogeneous acid catalysts have limitations, such as poor thermal stability, low specific surface area, etc. (Reddy et al, 2005;Ahmed et al, 2008). Nevertheless, sulfated zirconia is recognized as a very strong acid catalyst and possesses all the advantages of heterogeneous catalysts (Zhao et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

An Alternative Route for the Preparation of Sulfated Zirconia Loaded on Alumina (SZA) for Biodiesel Production: An Optimization Study

Yee

Lee

Abdullah

et al. 2013

Energy Sources, Part A: Recovery, Utilization, and Environmenta

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This study reported a simplified method to prepare sulfated zirconia loaded on alumina catalyst for transesterification of Jatropha Curcas L. oil with methanol to biodiesel or fatty acid methyl esters. The catalyst was found to have high catalytic activity. X-ray diffraction and Fourier transform infrared spectroscopy analysis showed that the catalyst has the basic characteristic of an acidic catalyst. The catalyst preparation conditions were optimized using design of experiment, specifically response surface methodology and an optimum fatty acid methyl ester yield (91.0 wt%) was obtained using a catalyst prepared with calcination temperature and duration at 329 ı C and 4.7 h, respectively.

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Structural characterization of sulfated zirconia and their catalytic activity in dehydration of ethanol

Cited by 73 publications

References 58 publications

Catalytic Dehydration of Ethanol to Ethylene on TiO2/4A Zeolite Composite Catalysts

Catalytic Dehydration of Ethanol to Ethylene on TiO2/4A Zeolite Composite Catalysts

DRIFTS of Probe Molecules Adsorbed on Magnesia, Zirconia, and Hydroxyapatite Catalysts

An Alternative Route for the Preparation of Sulfated Zirconia Loaded on Alumina (SZA) for Biodiesel Production: An Optimization Study

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