Layered Double Hydroxides Intercalated by Polyoxometalate Anions with Keggin (α-H2W12O406-), Dawson (α-P2W18O626-), and Finke (Co4(H2O)2(PW9O34)210-) Structures

The pillaring of Mg3Al layered double hydroxides by the title polyoxometalates was accomplished by ion exchange reaction of the LDH−hydroxide and −adipate precursors with the POM anion at ambient or refluxing temperatures

Sang Kyeong Yun; Thomas J. Pinnavaia

2002

Scholarcy highlights

  • The pillaring of Mg3Al layered double hydroxides by the title polyoxometalates was accomplished by ion exchange reaction of the LDH−hydroxide and −adipate precursors with the POM anion at ambient or refluxing temperatures
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  • The structural, thermal and textural properties of the LDH−POM intercalates were elucidated based on XRD, FTIR, TEM, EDS, and N2 adsorption−desorption studies
  • A gallery height of ∼10 Å was observed for the LDH intercalated by the symmetrical Keggin POM, whereas two different gallery heights were found for the cylindrical Dawson and Finke anions, depending on the preparation temperature
  • The crystalline microporous structures were retained upon heating each LDH−POM intercalate in N2 to 200 °C
  • Pillaring in all cases was accompanied by the formation of a poorly ordered Mg2+/Al3+ salt impurity that formed on the external surfaces of the LDH crystals
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