Catalytic Dehydration of Ethanol over W/TiO2 Catalysts Having Different Phases of Titania Support

Kerdnoi, Pongsatorn; Autthanit, Chaowat; Chitpong, Nithinart; Jongsomjit, Bunjerd

doi:10.9767/bcrec.15.1.5606.96-103

Cited by 5 publications

(3 citation statements)

References 22 publications

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“…The efficiency of TiO2 can be improved by surface modification and changing the structure of TiO2 crystals. TiO2 exists in various structural phases such as brookite, rutile and anatase [22]. The anatase phase of TiO2 is considered most efficient in electrocatalytic processes as compared to brookite and rutile phase.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Generation of Hydrogen and Methanol using ITO Sheet Decorated with Modified-Titania as Electrode

Abbas

Tahir

Amin

2021

Bull. Chem. React. Eng. Catal.

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Current issues of global warming and environmental pollution due to extensive use of fossil fuels has been reached to an alarming position. Being CO2 as main byproduct of fossil fuel consumption and water as abundantly available on earth surface has great potential to replace fossil fuels as energy source. Herein, electrocatalytic CO2 reduction with water for methanol and hydrogen gas (H2) production over ITO sheet decorated with modified-Titanium nanorods (TiO2 NR), has been investigated. The performance comparison of electrocatalytic activity of hydrothermally modified-titania with commercial TiO2 microparticles (MP) were further investigated. Electrochemical reactor containing KHCO3 aqueous solution with CO2 as an electrolyte and modified TiO2 nanorods (NR) as working electrodes offer an eco-friendly system to produce clean and sustainable energy system. The typical rates of product, i.e. methanol and H2 generation from the ITO sheet decorated with modified TiO2 NR layer recorded higher than those for the ITO sheet with commercial TiO2 microparticle. At 2.0V applied potential vs Ag/AgCl as reference electrode, the modified TiO2 NR electrocatalyst yielded methanol at a rate of 3.32 µmol.cm−2.L−1 and H2 at a rate of 6 µmol.cm−2.L−1 which was higher than that of commercial TiO2 MP electrocatalyst (methanol = 1.5 µmol.cm−2.L−1 and H2 = 3.7 µmol.cm−2.L−1). The enhancement in product yields of methanol and H2 was mainly due to the notable improvements and modification in texture of TiO2 working electrode interface. Hence, it is concluded that the modified TiO2 NR can be considered as a competent candidate for sustainable energy conversion applications. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).

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Section: Introductionmentioning

confidence: 99%

Electrochemical Generation of Hydrogen and Methanol using ITO Sheet Decorated with Modified-Titania as Electrode

Abbas

Tahir

Amin

2021

Bull. Chem. React. Eng. Catal.

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“…A wide spread of catalytic systems including Al2O3, TiO2, SiO2, clay, zeolite-based catalysts, and others for effective conversion of ethanol to higher valve products was investigated [17,[21][22][23]. Across various catalysts investigated, balancing/controlling the available acid-base sites on the catalyst surface has been recognized as the key design metric for controlling the selectivity of desire products.…”

Section: Introductionmentioning

confidence: 99%

Production of Acetaldehyde via Oxidative Dehydrogenation of Ethanol over AgLi/SiO2 Catalysts

Mukda

Autthanit

Praserthdam

et al. 2020

Bull. Chem. React. Eng. Catal.

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Three AgLi/SiO2 catalysts containing different types of silica supports [small particle size (SPS), medium particle size (MPS) and large particle size (LPS)] were prepared by incipient wetness co-impregnation techniques and tested in oxidative dehydrogenation of ethanol into acetaldehyde. The catalysts were characterized and evaluated by various characterization techniques (e.g. XRD, N2 physisorption, SEM-EDX, UV-Visible spectroscopy, H2-TPR, and CO2-TPD). This study reveals that the catalyst with the best performance is AgLi/SiO2-LPS with a yield in acetaldehyde of 76.8% at 300 °C. The results obtained with the tested catalysts are discussed, and the reasons of performance improvement caused by the presence of the dispersion of active components, the interaction between active components and silica supports, the textural properties of catalysts and reducibility, are raised. Besides, the cooperation of redox properties (Agnδ+ cluster and Ag0) and weak basic density played a pivotal role in promoting the formation of acetaldehyde from ethanol oxidative dehydrogenation. Copyright © 2020 BCREC Group. All rights reserved

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“…Kerdnoi et al [24] determine in WO 3 /TiO 2 catalysts in different phase of titania that consist of anatase and rutile. The results show that catalysts with anatase supports giving the highest yield of diethyl ether and ethylene ca 27.4% and 10.6% respectively for catalytic dehydration reaction of ethanol at 300 ºC.…”

Section: Literature Reviewsmentioning

confidence: 99%

Effect of titania phase composition in WO3/TiO2 catalysts on catalytic properties in dehydration of ethanol to diethyl ether

Termvoratham

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At the present, several agricultural products can be used as raw materials for bio-ethanol production and consequently converted it into many valuable substances such as ethylene and diethyl ether. This can undergo via WO3/TiO2 catalyst in which the anatase phase of titania usually has a better activity on ethanol dehydration to diethyl ether and ethylene than rutile phase. However, pure anatase phase of titania perhaps does not give the best of catalytic properties. So, this study investigates on the effects of tungsten on titania-supported catalysts with different phase composition of titania consisting of anatase and rutile phase with various proportion (TiO2-R0, TiO2-R25, TiO2-R50, TiO2-R75 and TiO2-R100). The catalysts were characterized to determine physical properties and analyzed dynamic catalytic properties. It was found that the WO3/TiO2-R50 catalyst gave the highest ethylene (79.6% yield) at 350?C and DEE (9.0% yield) at 300 ?C due to it contained the highest weak to strong acid site ratio. Thus, WO3/TiO2-R50 catalyst was selected to study the stability of the catalysts on ethanol dehydration reaction. It was found that the catalyst was stable to the ethanol dehydration reaction to ethylene within 2 hours, but is not stable to diethyl ether by long ethanol dehydration reaction time effects coke formation. It is a factor to decrease active site on surface area leading to lower catalytic activity.

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Catalytic Dehydration of Ethanol over W/TiO2 Catalysts Having Different Phases of Titania Support

Cited by 5 publications

References 22 publications

Electrochemical Generation of Hydrogen and Methanol using ITO Sheet Decorated with Modified-Titania as Electrode

Electrochemical Generation of Hydrogen and Methanol using ITO Sheet Decorated with Modified-Titania as Electrode

Production of Acetaldehyde via Oxidative Dehydrogenation of Ethanol over AgLi/SiO2 Catalysts

Effect of titania phase composition in WO3/TiO2 catalysts on catalytic properties in dehydration of ethanol to diethyl ether

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