Catalytic dehydration of ethanol using transition metal oxide catalysts

Zaki, Tamer A.

doi:10.1016/j.jcis.2004.10.048

Cited by 105 publications

(58 citation statements)

References 22 publications

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“…Further increase in reaction temperature produces a decline in the DEE selectivity in favor of that of ethylene. In agreement with previous results with further increase in reaction temperature, DEE is expected to decompose, producing more ethylene [47][48][49]. It was quite interesting to note that as the sulfonic groups are decomposed the graphitic surfaces catalyze the dehydrogenation reaction.…”

Section: Catalytic Activitysupporting

confidence: 91%

Bioethanol Transformations Over Active Surface Sites Generated on Carbon Nanotubes or Carbon Nanofibers Materials

Almohalla¹,

Morales²,

Asedegbega–Nieto³

et al. 2014

TOCATJ

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Catalytic bioethanol transformations over carbon nanomaterials (nanofibers and nanotubes) have been evaluated at atmospheric pressure and in the temperature range of 473-773 K. The pristine carbon materials were compared with these samples after surface modification by introducing sulfonic groups. The specific activity for ethanol dehydrogenation, yielding acetaldehyde, increases with the surface graphitization degree for these materials. This suggests that some basic sites can be related with specific surface graphitic structures or with the conjugated basic sites produced after removing acidic oxygen surface groups. Concerning the dehydration reaction over sulfonated samples, it is observed that catalytic activities are related with the amount of incorporated sulfur species, as detected by the evolution of SO 2 in the Temperature programmed Desorption (TPD) as well as by the analysis of sulfur by X-Ray Photoelectron Spectroscopy (XPS).

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Section: Catalytic Activitysupporting

confidence: 91%

Bioethanol Transformations Over Active Surface Sites Generated on Carbon Nanotubes or Carbon Nanofibers Materials

Almohalla¹,

Morales²,

Asedegbega–Nieto³

et al. 2014

TOCATJ

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“…The relationship between acid properties and reaction selectivity of alcohol decomposition is unclear 7) . This characteristic behavior of reaction selectivity will be studied in the near future.…”

Section: Resultsmentioning

confidence: 99%

High Temperature-tolerant Solid Acid of Zirconia Supported on Calcium Oxide

Matsuhashi

Tabata

2011

J. Jpn. Petrol. Inst.

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A new solid acid catalyst consisting of ZrO2 supported on CaO, ZrO2/CaO was prepared by deposition of Zr alkoxide on CaO and calcination at high temperatures. A catalyst prepared by the double deposition method, ZrO2/ZrO2/CaO, was also tested. The characteristics of the catalysts were investigated for transesterification and ethanol decomposition. The transesterification activity of the ZrO2/CaO catalyst was comparable with that of proton-type zeolites. The ethanol conversion activity was similar to that of SiO2 _ Al2O3. Diethyl ether was not formed on the ZrO2/CaO catalyst, which showed very high selectivity for ethylene formation. The ZrO2/ZrO2/ CaO catalyst showed activity for ethanol conversion even though calcined at 1373 K.

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“…These catalysts include the supported phosphoric acid, alumina, silica-alumina, heteropolyacid catalysts and zeolites [5,6]. Furthermore, different transition metal catalysts such as titanium oxides, magnesium oxides, cobalt oxides, chromium oxide and silver salt of tungstophosphoric acid [7,8] were also investigated for the catalytic dehydration of ethanol. The catalytic activity for dehydration of ethanol could be correlated to the number of strong Brønsted acid sites in catalyst [9].…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study of Different Al-based Solid Acid Catalysts for Catalytic Dehydration of Ethanol

Kamsuwan¹,

Jongsomjit²

2016

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Abstract. In this present study, the catalytic dehydration of ethanol over three different Al-based solid acid catalysts including H-beta zeolite (HBZ), modified H-beta zeolite with γ-Al2O3 (Al-HBZ) and mixed γ-χ phase of Al2O3 (M-Al) catalysts was investigated. The ethanol dehydration reaction was performed at temperature range of 200 to 400 o C. It revealed that all catalysts exhibited higher ethanol conversion with increased temperatures. At low temperatures (ca. 200 to 250 o C), diethyl ether (DEE) was obtained as a major product for all catalysts. However, with increased temperatures (ca. 300 to 400 o C), ethylene was a major product. Among all catalysts, HBZ exhibited the highest ethanol conversion giving the ethylene yield of 99.4% at 400 o C. This can be attributed to the largest amount of weak acid sites present in HBZ, which is related to the Brønsted acid. It should be mentioned that HBZ also rendered the highest catalytic activity for every reaction temperature. As the results, HBZ catalyst is promising to produce ethylene and DEE from ethanol, which is considered as cleaner technology.

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Catalytic dehydration of ethanol using transition metal oxide catalysts

Cited by 105 publications

References 22 publications

Bioethanol Transformations Over Active Surface Sites Generated on Carbon Nanotubes or Carbon Nanofibers Materials

Bioethanol Transformations Over Active Surface Sites Generated on Carbon Nanotubes or Carbon Nanofibers Materials

High Temperature-tolerant Solid Acid of Zirconia Supported on Calcium Oxide

A Comparative Study of Different Al-based Solid Acid Catalysts for Catalytic Dehydration of Ethanol

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