Abstract
The acid properties of layered Me phosphates (MeTi, Ge, Zr, Sn) were determined by NH 3 temperature-programmed desorption. Careful establishment of the preheating conditions suppressed interference from NH 3 intercalation and allowed the surface acidity to be measured. A scale of acidity strength in line with the catalytic behaviour of these phosphates in acid-catalysed reactions was obtained.
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