Acidic pores: The first cubic mesoporous tin(IV) phosphate and its hexagonal form are reported and characterized by X-ray diffraction, transmission electron microscopy (see picture of the cubic domain), and Brunauer–Emmet–Teller techniques. Microcalorimetric experiments and preliminary catalytic tests indicate that these solids are very acidic and exhibit a good catalytic activity for the removal of NOx (deNOx).
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Serre et al. (2002) studied this question.