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Kim, Tae Hyeop,Gim, Min Yeong,Song, Ji Hwan,Choi, Won Choon,Park, Yong-Ki,Hong, Ung Gi,Park, Deuk Soo,Song, In Kyu Elsevier 2017 CATALYSIS COMMUNICATIONS - Vol.97 No.-
<P><B>Abstract</B></P> <P>A series of thermally deactivated CrO<SUB>y</SUB>/Al<SUB>2</SUB>O<SUB>3</SUB>-ZrO<SUB>2</SUB> catalysts with different Zr/Al molar ratio (denoted as Cr/AZ-X, X=Zr/Al molar ratio) were prepared for use in the dehydrogenation of propane to propylene by lattice oxygen of the catalysts. It was found that α-chromia-alumina phase was formed as a result of catalyst deactivation. The relative distribution of chromium species was different depending on Zr/Al molar ratio of the catalysts. Among the catalysts, Cr/AZ-0.07 catalyst with the lowest amount of α-chromia-alumina and the largest amount of active chromium species (Cr<SUP>3+</SUP>) showed the best catalytic activity in the dehydrogenation of propane to propylene.</P> <P><B>Highlights</B></P> <P> <UL> <LI> CrO<SUB>y</SUB>/Al<SUB>2</SUB>O<SUB>3</SUB>-ZrO<SUB>2</SUB> (Cr/AZ-X) catalysts with different Zr/Al ratio (X) were prepared. </LI> <LI> CrO<SUB>y</SUB>/Al<SUB>2</SUB>O<SUB>3</SUB>-ZrO<SUB>2</SUB> (Cr/AZ-X) catalysts were thermally deactivated. </LI> <LI> Dehydrogenation of propane by lattice oxygen of the catalysts was conducted. </LI> <LI> Cr/AZ-0.07 showed the most promising catalytic activity. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Depinning Field at Notches of Ferromagnetic Nanowires With Perpendicular Magnetic Anisotropy
Kab-Jin Kim,Gi-Hong Gim,Jae-Chul Lee,Sung-Min Ahn,Kang-Soo Lee,Young Jin Cho,Chang-Won Lee,Sunae Seo,Kyung-Ho Shin,Sug-Bong Choe IEEE 2009 IEEE transactions on magnetics Vol.45 No.10
<P>In this paper, we experimentally characterize the domain-wall depinning mechanism at notches of ferromagnetic nanowires with perpendicular magnetic anisotropy. A time-resolved magneto-optical Kerr effect detection reveals that the depinning time is exponentially proportional to the strength of external magnetic field. From an analysis based on Neacuteel-Brown theory, the depinning field and the activation volume are quantitatively determined for several notches with different gap distances. Interestingly, both the depinning field and the activation volume are proportional to the inverse of the gap distance. This is explained by the sizeable extrinsic effect from geometric constrictions in contrast to the intrinsic properties of the films.</P>