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Hydrotalcites with an extended Al3+-substitution: Synthesis, simultaneous TG-DTA-MS study, and their CO2 adsorption behaviors

Published online by Cambridge University Press:  31 January 2011

Masamichi Tsuji ,
Gang Mao ,
Takashi Yoshida  and
Yutaka Tamaura
Masamichi Tsuji
Affiliation:
Department of Chemistry, Research Center for Carbon Recycling & Utilization, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152, Japan
Gang Mao
Affiliation:
Department of Chemistry, Research Center for Carbon Recycling & Utilization, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152, Japan
Takashi Yoshida
Affiliation:
Department of Chemistry, Research Center for Carbon Recycling & Utilization, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152, Japan
Yutaka Tamaura
Affiliation:
Department of Chemistry, Research Center for Carbon Recycling & Utilization, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152, Japan
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Abstract

A maximum Al3+-substitution has been demonstrated to be 45 mole% of (M + Al) in the brucite layer of hydrotalcites. The chemical composition of the highly substituted hydrotalcites can be typically represented by [M0.55Al0.45(OH)2] [(CO3)0.225 · 0.50H2O] where M = Mg, Ni, Zn, and Co. It showed the small lattice parameters of a0 3.05–2.98 A in the hexagonal lattice, which corroborates Al3+-substitution in the brucite layer. The simultaneous thermal analyses (TG and DTA) and mass spectrometry (MS) study have been performed. The highly Al3+-substituted hydrotalcites also showed quite different isotherms for the CO2 adsorption. These materials adsorbed CO2 gas by removing water within the interlayer and showed the selectivity for CO2 adsorption: Cu–Al ∼Zn—Al < Co—Al < Mg—Al < Ni—Al. The Mg—Al and Co—Al hydrotalcite-like compounds showed a doubled amount of CO2 by removing carbonate ions within the interlayer.

Type
Articles
Information
Journal of Materials Research , Volume 8 , Issue 5 , May 1993 , pp. 1137 - 1142
Copyright
Copyright © Materials Research Society 1993

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