Characterization of Alumina Doped with Lanthanum and Pluronic P123 via Sol-Gel Process (Characterization of Alumina Doped with Lanthanum and Pluronic P123 via Sol-Gel Process)

서지정보

· 발행기관 : 한국세라믹학회
· 수록지 정보 : 한국세라믹학회지 / 45권 / 5호 / 297 ~ 302페이지
· 저자명 : 정미원, 이미회

초록

To direct the evolution of nanostructure and immobilize γ-Al2O3 catalyst, nanocrystalline La-doped-Al2O3 powder were prepared
by the sol-gel process with addition of an amphiphilic block copolymer template (pluronic P123: (poly(ethyleneoxide)20-
poly(propyleneoxide)70-poly(ethyleneoxide)20). The dried gel is amorphous, whereas heating at temperature above 700
o
C leads to the
formation of nanocrystalline γ and δ-Al2O3 and these two phases is kept until 1100
o
C. α-Al2O3 starts to form at 1200
o
C with
LaAll1O18. The surface morphology and crystal structure has been observed by field emission scanning electron microscope (FE-SEM)
and X-ray diffraction (XRD). Solid state
27
Al MAS NMR indicates two types of local environment, i.e. octahedral and tetrahedral sites.
The surface area and pore size was compared among these powders using the BET nitrogen adsorption measurements.

영어초록

To direct the evolution of nanostructure and immobilize γ-Al2O3 catalyst, nanocrystalline La-doped-Al2O3 powder were prepared
by the sol-gel process with addition of an amphiphilic block copolymer template (pluronic P123: (poly(ethyleneoxide)20-
poly(propyleneoxide)70-poly(ethyleneoxide)20). The dried gel is amorphous, whereas heating at temperature above 700
o
C leads to the
formation of nanocrystalline γ and δ-Al2O3 and these two phases is kept until 1100
o
C. α-Al2O3 starts to form at 1200
o
C with
LaAll1O18. The surface morphology and crystal structure has been observed by field emission scanning electron microscope (FE-SEM)
and X-ray diffraction (XRD). Solid state
27
Al MAS NMR indicates two types of local environment, i.e. octahedral and tetrahedral sites.
The surface area and pore size was compared among these powders using the BET nitrogen adsorption measurements.

참고자료

· 없음