Preparation of 27Ni(6)Zr(4)O(14)3M(M=Mg, Ca, Sr, or Ba)O/70 Zeolite Y Catalysts and Hydrogen-rich Gas Production by Ethanol Steam Reforming
- Preparation of 27Ni(6)Zr(4)O(14)3M(M=Mg, Ca, Sr, or Ba)O/70 Zeolite Y Catalysts and Hydrogen-rich Gas Production by Ethanol Steam Reforming
- 강미숙; 김동진; 이준수; 이가영; 박선민[박선민]; 지미정[지미정]; 최병현[최병현]
- PARTIAL OXIDATION
- Issue Date
- KOREAN CHEMICAL SOC
- BULLETIN OF THE KOREAN CHEMICAL SOCIETY, v.34, no.7, pp.2073 - 2080
- 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 Ni6Zr4O14 main catalytic species and the microporous Zeolite Y support. The characterizations of these catalysts were examined by XRD, TEM, H-2-TPR, NH3-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(Ni6Zr4O14)3MgO/70Zeolite Y catalyst at 600 degrees C. Many carbon deposits and carbon nano fibers were seen on the surface of 30Ni(6)Zr(4)O(14)/70Zeolite Y catalyst but lesser amounts were observed on alkaline-earth metal oxide-loaded 27(Ni6Zr4O14)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(Ni6Zr4O14)3MO/70Zeolite Y catalysts and promote hydrogen evolution by preventing progression to hydrocarbons.
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