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Keywords:

  • acidity;
  • green chemistry;
  • heterogeneous catalysis;
  • metal–organic frameworks;
  • polyoxometalates

After the publication of this Communication, it was brought to the Editor′s attention that some phrases and expressions in its text were adapted from other (cited) publications. The adaptations pertained to the specific samples measured by the authors, and the results obtained from those measurements.

The corresponding authors apologize for the use of these phrases and expressions in this manner.