Aqueous phase reforming and hydrodeoxygenation of ethylene glycol on Pt/SiO2-Al2O3: Effects of surface acidity on product distribution

Seongho Jeon, Hyun Seog Roh, Dong Ju Moon, Jong Wook Bae

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Aqueous-phase reforming (APR) and aqueous-phase hydrodeoxygenation (APH) reactions of ethylene glycol (EG) were investigated using platinum supported solid-acid SiO2-Al2O3 catalysts with different Si/Al molar ratios. The molar ratio of Si/Al on the SiO2-Al2O3 mixed metal oxides largely altered the surface area due to changes to the acidity, as well as changing the reduction behavior of the supported platinum nanoparticles. The Pt/SiO2-Al2O3 catalysts with a Si/Al molar ratio of 0.1 showed a higher activity for APR as well as APH. Among the various properties of Pt/SiO2-Al2O3, the amount of acid sites on the SiO2-Al2O3 supports changed the EG conversion and production distribution with different coke depositions. The acidic property was a more dominant factor for the catalytic activity than the affects of the platinum crystallite size on the reduction behavior. The easy and simultaneous cleavages of C-C as well as the C-O bonds in EG on the Bronsted acid sites of Pt/SiO2-Al2O3 catalysts were responsible for a higher EG conversion and hydrocarbon formation. A larger number of weak acid sites was also related to the formation of larger hydrocarbons and a lower coke deposition. Compared with Pt/Al2O3, improved catalytic acidity with a low coke deposition was observed for Pt/SiO2-Al2O3 at a Si/Al molar ratio of 0.1. This can mainly be attributed to the easy control of weak and strong acid sites with a high dispersion of platinum crystallites by simply changing the Si/Al molar ratio of the SiO2-Al2O3 mixed metal oxides.

Original languageEnglish
Pages (from-to)68433-68444
Number of pages12
JournalRSC Advances
Volume6
Issue number72
DOIs
Publication statusPublished - 2016 Jan 1

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Ethylene Glycol
Reforming reactions
Ethylene glycol
Acidity
Platinum
Acids
Coke
Hydrocarbons
Oxides
Catalysts
Metals
Crystallite size
Crystallites
Catalyst activity
Nanoparticles

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

Cite this

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title = "Aqueous phase reforming and hydrodeoxygenation of ethylene glycol on Pt/SiO2-Al2O3: Effects of surface acidity on product distribution",
abstract = "Aqueous-phase reforming (APR) and aqueous-phase hydrodeoxygenation (APH) reactions of ethylene glycol (EG) were investigated using platinum supported solid-acid SiO2-Al2O3 catalysts with different Si/Al molar ratios. The molar ratio of Si/Al on the SiO2-Al2O3 mixed metal oxides largely altered the surface area due to changes to the acidity, as well as changing the reduction behavior of the supported platinum nanoparticles. The Pt/SiO2-Al2O3 catalysts with a Si/Al molar ratio of 0.1 showed a higher activity for APR as well as APH. Among the various properties of Pt/SiO2-Al2O3, the amount of acid sites on the SiO2-Al2O3 supports changed the EG conversion and production distribution with different coke depositions. The acidic property was a more dominant factor for the catalytic activity than the affects of the platinum crystallite size on the reduction behavior. The easy and simultaneous cleavages of C-C as well as the C-O bonds in EG on the Bronsted acid sites of Pt/SiO2-Al2O3 catalysts were responsible for a higher EG conversion and hydrocarbon formation. A larger number of weak acid sites was also related to the formation of larger hydrocarbons and a lower coke deposition. Compared with Pt/Al2O3, improved catalytic acidity with a low coke deposition was observed for Pt/SiO2-Al2O3 at a Si/Al molar ratio of 0.1. This can mainly be attributed to the easy control of weak and strong acid sites with a high dispersion of platinum crystallites by simply changing the Si/Al molar ratio of the SiO2-Al2O3 mixed metal oxides.",
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Aqueous phase reforming and hydrodeoxygenation of ethylene glycol on Pt/SiO2-Al2O3 : Effects of surface acidity on product distribution. / Jeon, Seongho; Roh, Hyun Seog; Moon, Dong Ju; Bae, Jong Wook.

In: RSC Advances, Vol. 6, No. 72, 01.01.2016, p. 68433-68444.

Research output: Contribution to journalArticle

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T1 - Aqueous phase reforming and hydrodeoxygenation of ethylene glycol on Pt/SiO2-Al2O3

T2 - Effects of surface acidity on product distribution

AU - Jeon, Seongho

AU - Roh, Hyun Seog

AU - Moon, Dong Ju

AU - Bae, Jong Wook

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Y1 - 2016/1/1

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AB - Aqueous-phase reforming (APR) and aqueous-phase hydrodeoxygenation (APH) reactions of ethylene glycol (EG) were investigated using platinum supported solid-acid SiO2-Al2O3 catalysts with different Si/Al molar ratios. The molar ratio of Si/Al on the SiO2-Al2O3 mixed metal oxides largely altered the surface area due to changes to the acidity, as well as changing the reduction behavior of the supported platinum nanoparticles. The Pt/SiO2-Al2O3 catalysts with a Si/Al molar ratio of 0.1 showed a higher activity for APR as well as APH. Among the various properties of Pt/SiO2-Al2O3, the amount of acid sites on the SiO2-Al2O3 supports changed the EG conversion and production distribution with different coke depositions. The acidic property was a more dominant factor for the catalytic activity than the affects of the platinum crystallite size on the reduction behavior. The easy and simultaneous cleavages of C-C as well as the C-O bonds in EG on the Bronsted acid sites of Pt/SiO2-Al2O3 catalysts were responsible for a higher EG conversion and hydrocarbon formation. A larger number of weak acid sites was also related to the formation of larger hydrocarbons and a lower coke deposition. Compared with Pt/Al2O3, improved catalytic acidity with a low coke deposition was observed for Pt/SiO2-Al2O3 at a Si/Al molar ratio of 0.1. This can mainly be attributed to the easy control of weak and strong acid sites with a high dispersion of platinum crystallites by simply changing the Si/Al molar ratio of the SiO2-Al2O3 mixed metal oxides.

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