Publication

Porous hollow manganites with robust composite shells for oxidation of CO at low temperature

조회수 : 169 등록일 : 2017.01.12 00:00

저자 : Hur, NH (Hur, Nam Hwi)
출처 : RSC ADVANCES
출판일 : 2016.11.24
 
Porous hollow manganites with robust composite shells for oxidation of CO at low temperature
 
 
Yoo, JB (Yoo, Jung Bo)[ 1 ] ; Bang, S (Bang, Sora)[ 2 ] ; Kim, K (Kim, Kyungtae)[ 2 ] ; Li, C (Li, Chengbin)[ 3 ] ; Kim, JM (Kim, Ji Man)[ 3 ] ; Hur, NH (Hur, Nam Hwi)[ 2 ]
 
 
[ 1 ] Korea Atom Energy Res Inst, Nucl Chem Res Div, 111 Daedeok Daero 989, Daejeon 34057, South Korea
[ 2 ] Sogang Univ, Dept Chem, Seoul 121742, South Korea
[ 3 ] Sungkyunkwan Univ, Dept Chem, Suwon 16419, South Korea

 
 
Yolk- and hollow-type manganite-coated silica (SiO2) microspheres were synthesized via the thermal hydrolysis of urea using a dissolution and deposition method. Core/shell SiO2 microspheres were used as templates; the products were then annealed at 700 degrees C for 10 h under an O-2 atmosphere. Yolk microspheres (Mn2O3/SiO2_1T and Mn2O3/SiO2_2T) were obtained when the dissolution and deposition step was repeated once and twice, respectively, while hollow microspheres (Mn2O3/SiO2_3T) were produced when the method was repeated three times. The microspheres had average diameters of 300-310 nm. The Mn2O3/SiO2_3T product possessed the largest Brunauer-Emmett-Teller (BET) surface area and exhibited the best catalytic performance with regard to CO oxidation. The complete conversion of CO was achieved at approximately 200 degrees C. Other microspheres, including Mn3O4/SiO2_3T, NiO/SiO2_3T, and Ni/SiO2_3T, yielded much lower activities than the Mn2O3/SiO2_3T catalyst. The large surface area of the Mn2O3/SiO2_3T microsphere sample, as well as the presence of Mn3+ ions, appears to be responsible for its superior catalytic CO oxidation activity amongst the tested catalysts.
 
 
 
 
 
 
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