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Interaction of Polar Substrates with Transition Metal Substituted Keggin-Type Heteropolyanions [X(H2O)W11SiO39]6−(X=Co2+, Mn2+) Pillared in a Mg-Al Hydrotalcite-Like Clay

Published online by Cambridge University Press:  28 February 2011

Esteban López Salinas ,
Pedro Salas Castillo  and
Yoshio Ono
Esteban López Salinas
Affiliation:
Instituto Mexicano del Petróleo, Gerencia de Catálisis y Materiales, Eje Central Lázaro Cárdenas 152, CP 07730 México, D.F.
Pedro Salas Castillo
Affiliation:
Instituto Mexicano del Petróleo, Gerencia de Catálisis y Materiales, Eje Central Lázaro Cárdenas 152, CP 07730 México, D.F.
Yoshio Ono
Affiliation:
Tokyo Institute of Technology, Department of Chemical Engineering, Ookayama, Meguro-ku, 152 Tokyo, Japan
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Abstract

The intercalation of Keggin-type [X(H2O)W11SiO39]6−(X=Co2+, Mn2+) heteropolyanions by aqueous anion exchange of 10 Å in a synthetic hydrotalcite-like Mg2Al(OH)6(NO3) results in products with interlayer spacing of ca. 10 Å. The layered array of the product and the integrity of the intercalated heteropolyanion are stable below 623 K in air as examined by XRD and IR analyses, respectively. UV-vis Diffuse Reflectance spectroscopy indicates that the water ligand in the intercalated [Co(H2O)W11SiO39]6− can be removed by thermal evacuation at 473 K leaving a coordinatively unsaturated site (in the transition metal) which reversibly coordinates water,methanol, ethanol or ammonia. ESR analysis of the intercalated [Mn(H2O)W11SiO39]6− shows that the shape of a signal at g = 2.00, arising from six-coordinated Mn2+ strongly depends on adsorption-desorption of the water ligand.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 371: Symposium W1 – Advances in Porous Materials , 1994 , 163
Copyright
Copyright © Materials Research Society 1995

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