Comparison of four catalysts in the catalytic dehydration of ethanol to ethylene

Zhang, Xian; Wang, Rijie; Yang, Xiaojing; Zhang, Fengbao

doi:10.1016/j.micromeso.2008.04.004

Cited by 175 publications

(112 citation statements)

References 17 publications

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“…However, the amount of weak acid site, moderate to strong acid site and total acid site of M-Al were the lowest among other two catalysts. It was reported that the weak acid site is essential for the catalytic dehydration of ethanol to ethylene [4,5,22,23]. Thus, the presence of large amount of weak acid would be beneficial to enhance the catalytic activity.…”

Section: Fig 4 Sem Images Of All Catalystsmentioning

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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Section: Fig 4 Sem Images Of All Catalystsmentioning

confidence: 99%

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

Kamsuwan¹,

Jongsomjit²

2016

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“…However, during the last 150 minutes, dehydration of ethanol became the predominant reaction. According Zhang et al 16 ethanol dehydrogenation to produce acetaldehyde can also occur as a side reaction at higher reaction temperatures.…”

Section: Catalytic Performancesmentioning

confidence: 99%

Synthesis, characterization and catalytic properties of nanocrystaline Y2O3-coated TiO2 in the ethanol dehydration reaction

et al. 2012

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In the present study, TiO 2 nanopowder was partially coated with Y 2 O 3 precursors generated by a sol-gel modified route. The system of nanocoated particles formed an ultra thin structure on the TiO 2 surfaces. The modified nanoparticles were characterized by high resolution transmission electron microscopy (HR-TEM), X-ray diffraction (XRD) analysis, Zeta potential and surface area through N 2 fisisorption measurements. Bioethanol dehydration was used as a probe reaction to investigate the modifications on the nanoparticles surface. The process led to the obtainment of nanoparticles with important surface characteristics and catalytic behavior in the bioethanol dehydration reaction, with improved activity and particular selectivity in comparison to their non-coated analogs. The ethylene production was disfavored and selectivity toward acetaldehyde, hydrogen and ethane increased over modified nanoparticles.

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“…Previous studies reported that HZSM-5 zeolite with strong Brønsted acid sites was an effective catalyst for this transformation [22]. However, deactivation due to coke formation on its surface led to decreasing activity and selectivity towards ethylene [23] and therefore made the process unsuitable for industrial applications [24]. Phillips and Datta [25] investigated the production of ethylene from hydrous ethanol over HZSM-5 under mild conditions and demonstrated that strong Brønsted acid sites led to rapid catalyst deactivation in the initial stages through the oligomerization of ethylene and the formation of carbonaceous species.…”

Section: Introductionmentioning

confidence: 99%

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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Comparison of four catalysts in the catalytic dehydration of ethanol to ethylene

Cited by 175 publications

References 17 publications

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

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

Synthesis, characterization and catalytic properties of nanocrystaline Y2O3-coated TiO2 in the ethanol dehydration reaction

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

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