PILLARING OF LAYERED DOUBLE HYDROXIDES WITH POLYOXOMETALATES IN AQUEOUS-SOLUTION WITHOUT USE OF PRESWELLING AGENTS Academic Article uri icon

abstract

  • By using wet samples of layered double hydroxides (LDHs), the direct pillaring reactions of these compounds with polyoxometalate (POM) ions with Keggin-type structure have been effected in an aqueous one-step reaction without any organic preswelling agents. Full exchange of the Keggin ions into the layers is achieved as evidenced by X-ray powder diffraction, infrared spectroscopy, elemental analysis, and thermogravimetric analysis. The Mg-Al series of LDHs gave products consisting of a well crystalline phase with a d spacing of 14.7 and a less crystalline phase with a lower and less-defined interlayer distance. The Ni-containing LDHs, Ni2Al(0H)6NO3for example, yielded pillared products that correspond to the latter phase with interlayer spacings ranging between 11.0 and 13.5 . The lowered interlayer distance is attributed to creation of defects in the layers as a result of strong interactions between POM and the LDH layers. Surface area measurement results are also presented. 1992, American Chemical Society. All rights reserved.

published proceedings

  • CHEMISTRY OF MATERIALS

author list (cited authors)

  • WANG, J. D., TIAN, Y., WANG, R. C., & CLEARFIELD, A.

citation count

  • 88

complete list of authors

  • WANG, JD||TIAN, Y||WANG, RC||CLEARFIELD, A

publication date

  • November 1992