Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Preparation of 27Ni6Zr4O143M(M=Mg, Ca, Sr, or Ba)O/70 Zeolite Y Catalysts and Hydrogen-rich Gas Production by Ethanol Steam Reforming

  • Kim, Dongjin (Department of Chemistry, College of Science, Yeungnam University) ;
  • Lee, Jun Su (Department of Chemistry, College of Science, Yeungnam University) ;
  • Lee, Gayoung (Department of Chemistry, College of Science, Yeungnam University) ;
  • Choi, Byung-Hyun (Korean Institutes of Ceramic Engineering and Technology (KICET)) ;
  • Ji, Mi-Jung (Korean Institutes of Ceramic Engineering and Technology (KICET)) ;
  • Park, Sun-Min (Korean Institutes of Ceramic Engineering and Technology (KICET)) ;
  • Kang, Misook (Department of Chemistry, College of Science, Yeungnam University)
  • Received : 2013.02.07
  • Accepted : 2013.04.16
  • Published : 2013.07.20
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Abstract

In this study the effects of adding alkaline-earth (IIA) metal oxides to NiZr-loaded Zeolite Y catalysts were investigated on hydrogen rich production by ethanol steam reforming (ESR). Four kinds of alkaline-earth metal (Mg, Ca, Sr, or Ba) oxides of 3.0% by weight were loaded between the $Ni_6Zr_4O_{14}$ main catalytic species and the microporous Zeolite Y support. The characterizations of these catalysts were examined by XRD, TEM, $H_2$-TPR, $NH_3$-TPD, and XPS. Catalytic performances during ESR were found to depend on the basicity of the added alkaline-earth metal oxides and $H_2$ production and ethanol conversion were maximized to 82% and 98% respectively in 27($Ni_6Zr_4O_{14}$)3MgO/70Zeolite Y catalyst at $600^{\circ}C$. Many carbon deposits and carbon nano fibers were seen on the surface of $30Ni_6Zr_4O_{14}$/70Zeolite Y catalyst but lesser amounts were observed on alkaline-earth metal oxide-loaded 27($Ni_6Zr_4O_{14}$)3MO/70Zeolite Y catalysts in TEM photos after ESR. This study demonstrates that hydrogen yields from ESR are closely related to the acidities of catalysts and that alkaline-earth metal oxides reduce the acidities of 27($Ni_6Zr_4O_{14}$)3MO/70Zeolite Y catalysts and promote hydrogen evolution by preventing progression to hydrocarbons.

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References

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