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- 저자 : Chuang Du (검색결과 4 건)
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Seismic Performance of a New Type Concrete-Filled Precast Concrete Tubular Column
Chuang Du,Yanzhao Li,Chunxiao Zhang 대한토목학회 2020 KSCE JOURNAL OF CIVIL ENGINEERING Vol.24 No.2
To investigate the seismic behaviour of a new type of concrete-filled precast concrete tubular column, five concrete-filled precast concrete tubular columns varying in concrete strength and stirrup ratio were tested under cyclic loading. The behaviours of the failure mode, hysteretic curve, skeleton curve, bearing capacity, deformability, displacement ductility and energy dissipation were studied to evaluate the seismic resistance performance of the columns. The results show that the failure mode of the concrete-filled precast concrete tubular columns was flexural failure, and the hysteretic curve had a plump shuttle shape, which indicates that the concrete-filled precast concrete tubular column has good energy dissipating capacity. The bearing capacity of the specimen was increased with increasing concrete strength of the precast tube. The stirrup ratio has little effect on its bearing capacity, whereas it has a significant effect on the deformation, ductility and energy dissipation. The story drift of the specimens can meet the requirements of the elastic plastic story drift limit value of 1/50 of the code in China, and the ductility coefficient is greater than 3, which demonstrates that the concrete-filled precast concrete tubular column has excellent seismic properties.
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Xin Fang,Chuang Chen,He Jia,Yingnan Li,Jian Liu,Yisong Wang,Yanli Song,Tao Du,Liying Liu 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.95 No.-
It is acknowledged as a promising strategy to reduce excessive CO2 emissions by catalytic conversion tovalue-added chemicals, in which layered double hydroxide (LDH) derived catalysts play essential roles. Inthe present review, latest progresses were summarized to gain insights on this issue. LDH-derivedcatalysts can be prepared via various methods and possess favorable characteristics of reversibletopotactic transformation for further development. Compared to conventional catalysts, they showspecific advantages in specific surface area, metal element dispersion and active site distribution. Despiteof distinguished LDH-derived catalysts applied in CO2 reduction reactions to methane, methanol,hydrocarbons, etc., state-of-art LDH-derived catalysts consisted of catalyst-adsorbent synergistic systemare recently constructed to employ the surface CO2 adsorption boundary layer to increase the CO2 partialpressure near active sites for hydrogenation. The overall catalytic performance is thus promoteddramatically. Accordingly, the strategy of adsorption-enhanced hydrogenation is expected to facilitatethe industrialization of CO2 hydrogenation and is instructive for catalyst design in future.
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Xin Fang,Yunting Xi,He Jia,Chuang Chen,Yisong Wang,Yanli Song,Tao Du 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.88 No.-
Catalytic conversion of CO2 to methanol has attracted increasing interests as a promising strategy forreducing excessive CO2 emissions. However, the methanol selectivity drops rapidly with elevatedtemperature due to enhanced CO synthesis using conventional catalysts, which hiders its application. Herein, ZnO-ZrO2 solid solution catalysts (SSCs) were prepared with different methods and modified byadding extra metal, i.e., Al, Cr, Fe or Mg. As-prepared SSCs were characterized and tested in reaction. Theresults show that prepared ZnO-ZrO2 SSCs possess similar chemical compositions but different crystals,morphologies and pore systems, among which the C-ZZ synthesized by co-precipitation exhibits theoptimal property. After doping, the basic crystal of tetragonal ZrO2 can be retained and ternary ZnO-ZrO2-MOx SSCs are successfully prepared. There come dramatic improvements in overall catalyticperformance. Specifically, the 3Mg-C-ZZ SSC, at 3.0 MPa and GHSV of~2000 h 1, maintains a considerablemethanol selectivity of 81.5 % even at 320 C. Prepared catalysts present remarkable superiorities toconventional copper-based catalysts especially at high reaction temperatures, which endures thempromising applications in coupling conversion of CO2 to valuable chemicals with the intermedia ofmethanol.
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