Effects of ordered mesoporous bimodal structures of Fe/KIT-6 for CO hydrogenation activity to hydrocarbons

Jae Min Cho, Gui Young Han, Hae Kwon Jeong, Hyunseog Roh, Jong Wook Bae

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Highly ordered mesoporous bimodal structures of KIT-6 with average pore diameters of 3.6 and 5.4 nm originated from its different wall thickness were newly synthesized and applied for CO hydrogenation to hydrocarbons through Fischer-Tropsch Synthesis (FTS) reaction using the supported iron nanoparticles. The ordered bimodal mesopore structures of the KIT-6 with smaller than 5.4 nm in size showed a significantly enhanced FTS activity by selectively forming heterogeneous bimodal crystallite size distributions of iron nanoparticles. The positive effects of the mesoporous bimodal structures of the KIT-6 were mainly attributed to the facile formation of the spatially confined smaller iron nanoparticles, which can be strongly interacted with the structurally stable ordered mesoporous KIT-6 with the co-presence of the larger iron nanoparticles on the outer surfaces of the mesoporous bimodal KIT-6. After adding small amount of potassium promoter with 2 wt%K on the mesoporous bimodal Fe/KIT-6, a slight increase of CO conversion as well as C5+ selectivity with less extent of CO2 formation was observed due to the suppressed activity of water-gas shift reaction. However, the structurally unstable monomodal KIT-6 having a relatively larger mesopore above 7.3 nm showed a lower FTS activity by preferentially forming an inactive amorphous carbon species. A superior FTS activity on the ordered mesoporous bimodal Fe/KIT-6 was attributed to the easy formations of smaller iron carbides, where the active smaller iron carbides were strongly interacted and spatially confined inside of the highly ordered mesoporous bimodal KIT-6 surfaces.

Original languageEnglish
Pages (from-to)197-207
Number of pages11
JournalChemical Engineering Journal
Volume354
DOIs
Publication statusPublished - 2018 Dec 15

Fingerprint

Fischer-Tropsch synthesis
Carbon Monoxide
Hydrocarbons
Hydrogenation
Iron
hydrocarbon
Nanoparticles
iron
Water gas shift
Carbides
Amorphous carbon
Crystallite size
Potassium
potassium
iron nanoparticle
effect
carbon
gas
water
iron carbide

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

Cite this

Cho, Jae Min ; Han, Gui Young ; Jeong, Hae Kwon ; Roh, Hyunseog ; Bae, Jong Wook. / Effects of ordered mesoporous bimodal structures of Fe/KIT-6 for CO hydrogenation activity to hydrocarbons. In: Chemical Engineering Journal. 2018 ; Vol. 354. pp. 197-207.
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abstract = "Highly ordered mesoporous bimodal structures of KIT-6 with average pore diameters of 3.6 and 5.4 nm originated from its different wall thickness were newly synthesized and applied for CO hydrogenation to hydrocarbons through Fischer-Tropsch Synthesis (FTS) reaction using the supported iron nanoparticles. The ordered bimodal mesopore structures of the KIT-6 with smaller than 5.4 nm in size showed a significantly enhanced FTS activity by selectively forming heterogeneous bimodal crystallite size distributions of iron nanoparticles. The positive effects of the mesoporous bimodal structures of the KIT-6 were mainly attributed to the facile formation of the spatially confined smaller iron nanoparticles, which can be strongly interacted with the structurally stable ordered mesoporous KIT-6 with the co-presence of the larger iron nanoparticles on the outer surfaces of the mesoporous bimodal KIT-6. After adding small amount of potassium promoter with 2 wt{\%}K on the mesoporous bimodal Fe/KIT-6, a slight increase of CO conversion as well as C5+ selectivity with less extent of CO2 formation was observed due to the suppressed activity of water-gas shift reaction. However, the structurally unstable monomodal KIT-6 having a relatively larger mesopore above 7.3 nm showed a lower FTS activity by preferentially forming an inactive amorphous carbon species. A superior FTS activity on the ordered mesoporous bimodal Fe/KIT-6 was attributed to the easy formations of smaller iron carbides, where the active smaller iron carbides were strongly interacted and spatially confined inside of the highly ordered mesoporous bimodal KIT-6 surfaces.",
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Effects of ordered mesoporous bimodal structures of Fe/KIT-6 for CO hydrogenation activity to hydrocarbons. / Cho, Jae Min; Han, Gui Young; Jeong, Hae Kwon; Roh, Hyunseog; Bae, Jong Wook.

In: Chemical Engineering Journal, Vol. 354, 15.12.2018, p. 197-207.

Research output: Contribution to journalArticle

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T1 - Effects of ordered mesoporous bimodal structures of Fe/KIT-6 for CO hydrogenation activity to hydrocarbons

AU - Cho, Jae Min

AU - Han, Gui Young

AU - Jeong, Hae Kwon

AU - Roh, Hyunseog

AU - Bae, Jong Wook

PY - 2018/12/15

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