Influence of Phosphoric Acid Modification on Catalytic Properties of γ-χ Al2O3 Catalysts for Dehydration of Ethanol to Diethyl Ether

Mutjalin Limlamthong; Nithinart Chitpong; Bunjerd Jongsomjit

doi:10.9767/bcrec.14.1.2436.1-8

DOI: https://doi.org/10.9767/bcrec.14.1.2436.1-8

Influence of Phosphoric Acid Modification on Catalytic Properties of γ-χ Al2O3 Catalysts for Dehydration of Ethanol to Diethyl Ether

Mutjalin Limlamthong¹, Nithinart Chitpong², Bunjerd Jongsomjit¹

¹Center of Excellence on Catalysis and Catalytic Reaction Engineering, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand

²Department of Textile Engineering, Faculty of Engineering, Rajamangala University of Technology Thanyaburi, Pathumthani, 12110, Thailand

Received: 28 Mar 2018; Revised: 7 Aug 2018; Accepted: 15 Aug 2018; Available online: 25 Jan 2019; Published: 15 Apr 2019.

Editor(s): Istadi Istadi

BibTex Citation Data :

@article{BCREC2436,
    author = {Mutjalin Limlamthong and Nithinart Chitpong and Bunjerd Jongsomjit},
    title = {Influence of Phosphoric Acid Modification on Catalytic Properties of γ-χ Al2O3 Catalysts for Dehydration of Ethanol to Diethyl Ether},
    journal = {Bulletin of Chemical Reaction Engineering & Catalysis},
  volume = {14},
    number = {1},
    year = {2019},
    keywords = {Ethanol Dehydration; Diethyl Ether; Phosphoric Acid; Heterogeneous Catalyst},
    abstract = { In this present work, diethyl ether, which is currently served as promising alternative fuel for diesel engines, was produced via catalytic dehydration of ethanol over H 3 PO 4 -modified g-c Al 2 O 3  catalysts. The impact of H 3 PO 4  addition on catalytic performance and characteristics of catalysts was investigated. While catalytic dehydration of ethanol was performed in a fixed-bed microreactor at the temperature ranging from 200ºC to 400ºC under atmospheric pressure, catalyst characterization was conducted by inductively coupled plasma (ICP), X-ray diffraction (XRD), N 2  physisorption, temperature-programmed desorption of ammonia (NH 3 -TPD) and thermogravimetric (TG) analysis. The results showed that although the H 3 PO 4  addition tended to decrease surface area of catalyst resulting in the reduction of ethanol conversion, the Al 2 O 3  containing 5 wt% of phosphorus (5P/Al 2 O 3 ) was the most suitable catalyst for the catalytic dehydration of ethanol to diethyl ether since it exhibited the highest catalytic ability regarding diethyl ether yield and the quantity of coke formation as well as it had similar long-term stability to conventional Al 2 O 3  catalyst. The NH 3 -TPD profiles of catalysts revealed that catalysts containing more weak acidity sites were preferred for dehydration of ethanol into diethyl ether and the adequate promotion of H 3 PO 4  would lower the amount of medium surface acidity with increasing catalyst weak surface acidity. Nevertheless, when the excessive amount of H 3 PO 4  was introduced, it caused the destruction of catalysts structure, which resulted in the catalyst incapability due to the decrease in active surface area and pore enlargement.        },
   issn = {1978-2993},   pages = {1--8}  doi = {10.9767/bcrec.14.1.2436.1-8},
    url = {https://ejournal2.undip.ac.id/index.php/bcrec/article/view/2436}
}

Citation Format:

Abstract

In this present work, diethyl ether, which is currently served as promising alternative fuel for diesel engines, was produced via catalytic dehydration of ethanol over H₃PO₄-modified g-c Al₂O₃ catalysts. The impact of H₃PO₄ addition on catalytic performance and characteristics of catalysts was investigated. While catalytic dehydration of ethanol was performed in a fixed-bed microreactor at the temperature ranging from 200ºC to 400ºC under atmospheric pressure, catalyst characterization was conducted by inductively coupled plasma (ICP), X-ray diffraction (XRD), N₂ physisorption, temperature-programmed desorption of ammonia (NH₃-TPD) and thermogravimetric (TG) analysis. The results showed that although the H₃PO₄ addition tended to decrease surface area of catalyst resulting in the reduction of ethanol conversion, the Al₂O₃ containing 5 wt% of phosphorus (5P/Al₂O₃) was the most suitable catalyst for the catalytic dehydration of ethanol to diethyl ether since it exhibited the highest catalytic ability regarding diethyl ether yield and the quantity of coke formation as well as it had similar long-term stability to conventional Al₂O₃ catalyst. The NH₃-TPD profiles of catalysts revealed that catalysts containing more weak acidity sites were preferred for dehydration of ethanol into diethyl ether and the adequate promotion of H₃PO₄ would lower the amount of medium surface acidity with increasing catalyst weak surface acidity. Nevertheless, when the excessive amount of H₃PO₄ was introduced, it caused the destruction of catalysts structure, which resulted in the catalyst incapability due to the decrease in active surface area and pore enlargement.

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Keywords: Ethanol Dehydration; Diethyl Ether; Phosphoric Acid; Heterogeneous Catalyst

Funding: International Research Integration: Chula Research Scholar, Ratchadaphiseksomphot Endowment Fund; Research: Government Budget, Chulalongkorn University (2018)

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Section: Original Research Articles

Language : EN

In 2019: BCREC Volume 14 Issue 1 Year 2019 (April 2019)

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