Effect of HCl Loading and Ethanol Concentration over HCl-Activated Clay Catalysts for Ethanol Dehydration to Ethylene

Krutpijit, Chadaporn; Jongsomjit, Bunjerd

doi:10.5650/jos.ess17118

Cited by 9 publications

(2 citation statements)

References 34 publications

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“…(1) ethylene via an endothermic reaction (400-450ºC) with the decomposition of ethoxy groups over catalysts and (2) diethyl ether (DEE) via an exothermic reaction (<300ºC) with the reaction of ethoxy groups with undissociated ethanol. Moreover, acetaldehyde can be produced by endothermic reaction of ethanol dehydrogenation [4,[25][26][27].…”

Section: Literature Reviewsmentioning

confidence: 99%

Effects of titania phase and tungsten loading content in W/TIO2 catalysts on dehydration of ethanol to diethyl ether

Kerdnoi

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Nowadays, ethanol which is one of the most used renewable energies can be converted into the more valuable compounds. It was reported that titania-supported tungsten (W/TiO2) catalyst is able to convert ethanol into diethyl ether. However, titania support has different crystalline phases that can result in differences of physicochemical properties for the catalyst. Therefore, the present work reports on the catalytic behaviors of both different phases of titania and tungsten loading contents in catalytic ethanol dehydration to diethyl ether. To prepare the catalysts, the three different phases [anatase (A), rutile (R), and mixed phases (P25)] of titania supports were impregnated with 10 wt% of tungsten and denoted as 10W/TiO2-A, 10W/TiO2-R, and 10W/TiO2-P25, respectively. Moreover, ethanol dehydration was also performed to determine the overall activities for all catalysts. It was found that the 10W/TiO2-P25 catalyst exhibits the highest DEE yield (24.1%) at 300?C and ethylene yield (60.3%) at 400?C, whereas only 15.9% is obtained from 10W/TiO2-R catalyst. Besides the different phases of titania support, higher surface area of TiO2 is likely to play an important role on the better dispersion of acid sites leading to higher catalytic activity. Moreover, TiO2-P25 support was selected to further study to investigate the effect of W loading (0-20 wt%), which was denoted as 5W/TiO2-P25, 10W/TiO2-P25, 15W/TiO2-P25 and 20W/TiO2-P25, respectively. It was found that the 15W/TiO2-P25 catalyst gives the highest activity with DEE of 30.4% yield at 300?C and ethylene of 65.8% yield at 400?C due to its three major roles including; (1) high surface area, (2) high amount of W species distributed on the external surface of catalyst and (3) introduce acid sites as active sites in the reaction. There were the factors leading to obtain higher activity for ethanol dehydration of 15W/TiO2-P25 catalyst.

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Section: Literature Reviewsmentioning

confidence: 99%

Effects of titania phase and tungsten loading content in W/TIO2 catalysts on dehydration of ethanol to diethyl ether

Kerdnoi

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“…Therefore, the effect of ethanol concentration has to be evaluated. There are some researchers investigated on this effect on catalytic activity such as Krutpijit et al [118] and Wu et al [119]. In this study, the various ethanol concentration was used as reactant (99.9%, 75% and 50% by weight) in the oxidative dehydrogenation reaction.…”

Section: Effect Of Ethanol Concentration On Catalytic Activitymentioning

confidence: 99%

Oxidative dehydrogenation of ethanol to acetaldehyde over magnesium aluminium layered double hydroxides catalyst

Pinthong

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In this research, the characteristic and catalytic activity of Mg-Al LDH and their metal-modified mixed oxide were investigated. This research was divided into three parts. In the first part, the effect of calcination temperature on catalytic performance via oxidative dehydrogenation of ethanol was elucidated. The results showed that calcination temperature affected the characteristic of Mg-Al LDH, especially basicity. Moreover, the calcination temperature also affected the catalytic performance on oxidative dehydrogenation of ethanol over Mg-Al LDH. The result was consistent with the basicity of catalysts. In the second part, the Mg-Al mixed oxide derived from calcination of Mg-Al LDH was modified by loading metal (Mo, V or Cu) on the surface. The results showed that the catalytic activity of metal-modified catalyst was promoted in both dehydrogenation and oxidative dehydrogenation. The copper-modified catalyst (Cu/Mg-Al) exhibited the highest acetaldehyde yield of 41.8% at 350oC. Furthermore, the metal modification not negatively affected the stability of catalyst on oxidative dehydrogenation of ethanol upon time-on-stream for 10 h. According to further investigate the application of catalyst to bioethanol, the effect of water content in ethanol feed was studied in the third part. It revealed that water content negatively affected the catalytic performance of Cu/Mg-Al catalyst, but this effect would be eliminated at high reaction temperature. Moreover, the effect of reduction temperature on catalytic activity was elucidated by varying the pre-reduction temperature of Cu/Mg-Al catalyst (300 and 400oC). It was found that the pre-reduction step insignificantly affected the catalytic performance.

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Organic Reactions Using Clay and Clay-Supported Catalysts: A Survey of Recent Literature

Nagendrappa

Chowreddy

2021

Catal Surv Asia

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Effect of HCl Loading and Ethanol Concentration over HCl-Activated Clay Catalysts for Ethanol Dehydration to Ethylene

Cited by 9 publications

References 34 publications

Effects of titania phase and tungsten loading content in W/TIO2 catalysts on dehydration of ethanol to diethyl ether

Effects of titania phase and tungsten loading content in W/TIO2 catalysts on dehydration of ethanol to diethyl ether

Oxidative dehydrogenation of ethanol to acetaldehyde over magnesium aluminium layered double hydroxides catalyst

Organic Reactions Using Clay and Clay-Supported Catalysts: A Survey of Recent Literature

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