新規3・八面体型Ni-スメクタイトからのメゾポア多孔体の合成

概要

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Novel trioctahedral Ni-smectites were synthesized hydrothermally from Ni-Si hydrous oxide at 125°-300℃ under autogeneous water vapour pressure for 2 h. With increasing temperature of hydrothermal reaction, adsorption of methylene blue (MB) increased from 0.20 meq・g<-1> to 0.76 meq・g<-1> between 125℃ and 175℃, but gradually decreased from 0.76 meq・g<-1> to 0.48 meq・g<-1> between 175℃ and 300℃. On heating, the specimen NS-04 synthesized at 200℃ formed a porous material with mesopores and micropores indicating a maximum specific surface area (SSA) of 222 m^2g<-1>. Addition of fluorine decreased the MB adsorption and increased SSA. The mesoporous material from a precursory Ni-smectite NS-04 has a total SSA of 537 m_2g<-1>, a pore volume of 0.79 cm^3・g<-1> and an average pore diameter of 59Å, which are significantly higher than those of conventional pillared clays.
社団法人日本セラミックス協会の論文
1992-04-01