Bio-based hydrocarbons and oxygenates from catalytic bio-ethanol dehydration: comparison between gallium and germanium oxides as promoters on HBeta zeolites with various silica to alumina ratios

Sujeerakulkai, Sakgrit; Jitkarnka, Sirirat

doi:10.1016/j.jclepro.2015.07.047

Cited by 21 publications

(10 citation statements)

References 28 publications

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“…1. The specific sharp peaks of HBZ catalyst consist of θ at 4.6and .4 o [16,20]. The characteristic peaks of pure γ-Al2O3 are 46 and 67 o [18].…”

Section: Catalyst Characterizationmentioning

confidence: 97%

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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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“…1. The specific sharp peaks of HBZ catalyst consist of θ at 4.6and .4 o [16,20]. The characteristic peaks of pure γ-Al2O3 are 46 and 67 o [18].…”

Section: Catalyst Characterizationmentioning

confidence: 97%

“…Moreover, H-beta zeolite exhibits larger pore size than H-ZSM-5. Hence, it is expected to produce hydrocarbon with less coke deposition due to higher diffusivity in the pore [16].…”

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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“…However, the XRD peaks of both Ru and Pt were not detected due to their highly dispersed forms 18 20 indicating the similar XRD patterns for all catalysts. The characteristic sharp peaks of HBZ catalyst are present at 2θ 14.6 and 22.4 20,24 . After the modification of Ru and Pt into HBZ to obtain the Ru-HBZ and Pt-HBZ catalyst, it was appeared that the intensity of characteristic peaks 14.6 and 22.4 for HBZ slightly decreased suggesting that the lower crystallinity of modified HBZ catalysts was obtained.…”

Section: Characteristicsmentioning

confidence: 99%

“…Moreover, HBZ exhibits larger pore size than H-ZSM-5. Thus, it is favorable to produce hydrocarbon with less coke deposition due to higher diffusivity in the pore 20 .…”

Section: Introductionmentioning

confidence: 99%

Diethyl Ether Production during Catalytic Dehydration of Ethanol over Ru- and Pt- modified H-beta Zeolite Catalysts

2017

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“…1. The characteristic sharp peaks of HBZ catalyst are composed of 2θ at 14.6 and 22.4 17,26,32 . For alumina catalysts, the specific peaks of gamma phase of alumina G-Al are located at 46 and 67 19,33 , whereas the XRD peaks for chi phase of alumina M-Al are detected at 37 , 43 and 67 as also reported by Janlamoon and Jongsomjit 31 .…”

Section: Reaction Studymentioning

confidence: 99%

Characterization of Different Si- and Al-based Catalysts with Pd Modification and Their Use for Catalytic Dehydration of Ethanol

Kamsuwan

Jongsomjit

2018

J. Oleo Sci.

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This study aims to investigate the production of ethylene and diethyl ether from ethanol via catalytic dehydration using Si- and Al-based catalysts with Pd modification. First, six catalysts including H-beta zeolite (HBZ), mixed phases of γ-χ-AlO (M-Al) and γ-AlO (G-Al) with and without Pd modification (0.5 wt%) were prepared. The catalytic dehydration of vaporized ethanol at temperature ranging from 200 to 400°C was performed over the catalysts. For ethylene production, the most promising catalyst is HBZ (giving ethylene yield of ca. 99% at 400°C), whereas Pd modification has no significant effect on ethylene production. Considering the production of diethyl ether, it is produced at lower temperature (ca. 250°C) than that of ethylene. The most active catalyst to produce diethyl ether is HBZ with Pd modification (giving diethyl ether yield of ca. 48% at 250°C). Thus, increased diethyl ether yield can be achieved with Pd modification at low temperature for the HBZ catalyst. Other catalysts such as M-Al and G-Al can also produce significant amounts of ethylene. To elucidate the effect of Pd modification on these catalysts, different characterization techniques such as nitrogen physisorption (BET and BJH methods), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS) and ammonia temperature-programmed desorption were performed and further discussed in more detail.

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Bio-based hydrocarbons and oxygenates from catalytic bio-ethanol dehydration: comparison between gallium and germanium oxides as promoters on HBeta zeolites with various silica to alumina ratios

Cited by 21 publications

References 28 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

Diethyl Ether Production during Catalytic Dehydration of Ethanol over Ru- and Pt- modified H-beta Zeolite Catalysts

Characterization of Different Si- and Al-based Catalysts with Pd Modification and Their Use for Catalytic Dehydration of Ethanol

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