Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Platinum Nano-Dispersion via In Situ Processing - Preparation and catalytic Property of Porous $CaZrO_3/MgO/Pt$ Nanocomposite

  • Yoshikazu (Suzuki Synergy Materials Research Center, national Institute of Advanced Industrial Science and Technology(AIST)) ;
  • Hwang, Hae-Jin (Suzuki Synergy Materials Research Center, national Institute of Advanced Industrial Science and Technology(AIST)) ;
  • Naoki Kondo (Suzuki Synergy Materials Research Center, national Institute of Advanced Industrial Science and Technology(AIST)) ;
  • Tatsuki Ohji (Suzuki Synergy Materials Research Center, national Institute of Advanced Industrial Science and Technology(AIST))
  • Published : 2001.09.01
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Abstract

A bulk porous $CaZrO_3/MgO$ composite with plantinum nano-dispersion was synthesized in air atmosphere through the combination of several in situ reactions, including the pyrolysis of $PtO_2$. A mixture of $CaMg(CO_3)_2$(dolomite), $ZrO_2$, $PtO_2$ and LiF (0.5 wt%, as an additive) was cold isostatically pressed at 200 MPa and sintered at $1100^{\circ}C$ for 2 h. The porous $CaZrO_3/MgO/Pt$ composite ($CaZrO_3/MgO$ : Pt=99 : 1 in volume) had a uniformly open-porous structure (porosity: 56%) with three-dimensional (3-D) network and a narrow pore-size distribution, similarly to the porous $CaZrO_3/MgO$ composites reported before. Catalytic Properties (viz., NO direct decomposition and NO reduction by $C_2H_4$) of the $CaZrO_3/MgO/Pt$ composite were investigated up to $900^{\circ}C$. In the absence of oxygen, the NO conversion rate reached ~52% for the direct decomposition and ~100% for the reduction by $C_2H_4$, respectively. The results suggest the possibility of the porous composite as a multifunctional filter, i.e., simultaneous hot gas-filtering and $de-NO_x$ in one component.

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