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The nature of the precipitating agent strongly influences the synthesis of magnesium phosphate. Ortho- and pyro-phosphate can be obtained with the use of NaOH and NH4OH, respectively. Both solids obtained were investigated as synthesized or after calcinations by various physico-chemical techniques such as X-ray diffraction (XRD), diffuse reflectance infrared spectroscopy (DRIFT). The compounds calcined at 773 K have been further characterized by 31 P MAS-NMR spectroscopy. The skeletal isomerisation of 3,3-dimethylbut-1-ene (33DMB1) over MgP and MgPP catalysts is a first order reaction. The catalytic activity increases with the reaction temperature from 493 to 653 K for both solids. It is affected by the crystal phase of magnesium phosphate. The magnesium pyrophosphate (MgPP) catalyst is more active than magnesium orthophosphate (MgP) catalyst in this temperature range.

Influence of the Crystal Phase of Magnesium Phosphates Catalysts on the Skeletal Isomerization of 3,3-dimethylbut-1-ene