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      저자 : Siqian Jin (검색결과 2 건)
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      • Pd nanoparticles on a microporous covalent triazine polymer for H<sub>2</sub> production via formic acid decomposition

        Zhang, Siqian,Lee, Yu-Ri,Jeon, Hyo-jin,Ahn, Wha-Seung,Chung, Young-Min Elsevier 2018 Materials letters Vol.215 No.-

        <P><B>Abstract</B></P> <P>A new catalyst comprising Pd nanoparticles (NPs) supported on a microporous covalent triazine-based polymer (Pd/MCTP-1) was synthesized and applied for H<SUB>2</SUB> production via formic acid decomposition under ambient conditions without additives. The catalytic activity of Pd/MCTP-1 was found to be superior to those of the recently reported highly active Pd/MOF catalysts, Pd/C, and Pd/SBA-15, which may be attributed to two factors: i) the formation of monodisperse and smaller Pd NPs on MCTP-1 and ii) the neutral pH of the reaction medium attained in the presence of Pd/MCTP-1. Pd/MCTP-1 is highly stable and its catalytic activity was maintained without losses for three recycle runs.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Pd nanoparticles on a microporous covalent triazine-based polymer (Pd/MCTP-1) was synthesized. </LI> <LI> The Pd/MCTP-1showed excellent catalytic activity for formic acid decomposition. </LI> <LI> The superior activity is attributed to the formation of small nanoparticles and neutral pH of the reaction medium. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

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        Experimental and analytical performance evaluation of steel beam to concrete-encased composite column with unsymmetrical steel section joints

        Yunfeng Xiao,Lei Zeng,Zhenkun Cui,Siqian Jin,Yiguang Chen 국제구조공학회 2017 Steel and Composite Structures, An International J Vol.23 No.1

        The seismic performance of steel beam to concrete-encased composite column with unsymmetrical steel section joints is investigated and reported within this paper. Experimental and analytical evaluation were conducted on a total of 8 specimens with T-shaped and L-shaped steel section under lateral cyclic loading and axial compression. The test parameters included concrete strength, stirrup ratio and axial compression ratio. The response of the specimens was presented in terms of their hysterisis loop behavior, stress distribution, joint shear strength, and performance degradation. The experiment indicated good structural behavior and good seismic performance. In addition, a three-dimensional nonlinear finite-element analysis simulating was conducted to simulate their seismic behaviors. The finite-element analysis incorporated both bond-slip relationship and crack interface interaction between steel and concrete. The results were also compared with the test data, and the analytical prediction of joint shear strength was satisfactory for both joints with T-shaped and L-shaped steel section columns. The steel beam to concrete-encased composite column with unsymmetrical steel section joints can develop stable hysteretic response and large energy absorption capacity by providing enough stirrups and decreased spacing of transverse ties in column.

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