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- W2351669521 abstract "Influences of pH value swing, hydrothermal treatment and the surfactants addition on the pore structure of activated alumina were studied. The results indicated that pH value changes in alternative way could be beneficial to the preparation of pseudoboehmites with large, uniform crystalline sizes and high crystallinities, hydrothermal treatment favored the migration of aluminum atoms and promoted crystal growth, while surfactants could insert into layers of pseudoboehmite, decreasing the tendency in collapsing of layers and shrinking of capillarys upon calcinations, so pore structure of alumina could be controlled effectively. Hydrothermal treatment and pH value swing could shift the micropore distribution of alumina to macroporous direction, and decreased surface areas; the surfactants addition could shift the micropore distribution of alumina to microporous direction, and increase surface areas. The high-porosity alumina carriers were obtained with surface areas (≤150 m2·g-1 )and surface areas (≥250 m2·g-1). The coordinated states of aluminum species were investigated too, and it was found that aluminum atoms were in 4-coordinated and 6-coordinated states mainly, the addition of surfactants and hydrothermal treatment could remarkably influence the ratio of 4-coordinated Al to 6-coordinated Al." @default.
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- W2351669521 date "2007-01-01" @default.
- W2351669521 modified "2023-09-25" @default.
- W2351669521 title "Pore Structure Control of Activated Alumina" @default.
- W2351669521 hasPublicationYear "2007" @default.
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