Autothermal reforming of iso-octane and gasoline over Rh-based catalysts: Influence of CeO2/γ-Al2O3-based mixed oxides on hydrogen production

Yeon Gyu Jung, Yongmin Kim, Dae Hyung Lee, Seong Cheol Jang, SukWoo Nam, Jong Hee Han, Sung An Hong, Dae Ki Choi, Chang Won Yoon

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Autothermal reforming (ATR) of iso-octane in the presence of Rh-based catalysts (0.5 wt% of Rh) supported onto γ-Al2O3, CeO2, and ZrO2 were initially carried out at 700 C with a S/C ratio of 2.0, an O/C ratio of 0.84, and a gas hourly space velocity (GHSV) of 20,000 h-1. The activity of Rh/γ-Al2O3 was found to be higher than Rh/CeO2 and Rh/ZrO2, with H2 and (H2 + CO) yields of 1.98 and 2.48 mol/mol C, respectively, after 10 h. This Rh/γ-Al2O3 material, however, was potentially susceptible to carbon coking and produced 3.5 wt% of carbon deposits following the reforming reaction, as evidenced by C, H, N, and S elemental analysis. In contrast, Rh/CeO2 catalyst exhibited lower activity but higher stability than Rh/γ-Al2O3, with nearly no carbon being formed within 10 h. To combine the superior activity originated from Rh/γ-Al2O3 with high stability from Rh/CeO2, Rh/CeO2/γ-Al2O3 catalysts with different CeO2 contents were synthesized and examined for the ATR reactions of iso-octane. Compared to Rh/γ-Al2O 3, the newly prepared Rh/CeO2/γ-Al2O 3 catalysts (0.5 wt% of Rh and 20 wt% of CeO2) showed even enhanced activity during 10 h, and H2 and (H2 + CO) yields were calculated to be 2.08 and 2.62 mol/mol C, respectively. In addition, as observed with Rh/CeO2, the catalyst was further found to be stable with less than 0.3 wt% of carbon deposition after 10 h. The Rh/γ-Al2O3 and Rh/CeO2/γ-Al 2O3 catalysts were eventually tested for ATR reactions using commercial gasoline that contained sulfur, aromatics, and other impurities. The Rh/γ-Al2O3 catalyst was significantly deactivated, showing decreased activity after 4 h, while the Rh/CeO2/γ-Al2O3 catalyst proved to be excellent in terms of stability against coke formation as well as activity towards the desired reforming reaction, maintaining its ability for H 2 production for 100 h.

Original languageEnglish
Pages (from-to)15140-15151
Number of pages12
JournalInternational Journal of Hydrogen Energy
Volume38
Issue number35
DOIs
Publication statusPublished - 2013 Nov 22

Keywords

  • Autothermal reforming
  • Gasoline
  • Hydrogen production
  • Iso-octane
  • Mixed oxide supports
  • Rhodium catalyst

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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