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J. Korean Ceram. Soc. > Volume 35(5); 1998 > Article
Journal of the Korean Ceramic Society 1998;35(5): 443.
Pillar Host Material로써 Layered(Mg/Al) Double Hydroxide의 물리화학적 특성화
형경우, 이용석
전주대학교 화학·신소재학과
Physico-Chemical Characterization of the Layered Double Hydroxide as Pillar Host Material
ABSTRACT
le hydroxides(LDHs) [{{{{ {Mg }_{1-x } }}{{{{ {Al }_{x } }}({{{{ {OH}_{2 } }})]ζ+({{{{ {CO }`_{3 } ^{2- } ){ }_{x/2 } }}$.${{{{ { yH}_{2 }O }} wioth variation of layer charge densitywere synthesized by co-precipitation methdo since their charge densities have a very important role to be det-ermined the physicochemical properties of layered materials. The XRD IR and thermal studies of them were discussed and the kinetic study for the decarbonation reaction was also carried out. From the results of XRD analysis we found that the lattice parameter and the unit cell volume were linearly decreased with the amount of Al substituents(x) in the vicinity of x=2∼10${times}$1/3${times}$10-1 but they had nearly constant values when the x are far from these vicinit. The activation energies for the decarbonation reaction of x=6.8, 10${times}$1/3${times}${{{{ { 10}^{-1 } }} were estimated to be 47.0, 37.6, 39.3 kcal/mol The specific surface areas(90-120 m2/g) of stable hy-drotalcite-type LDHs were dractically decreased with increasing of layer charge density.
Key words: Layered Double Hydroxides(LDH), Layer Charge, Layered Materials, Kinetic study
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