Selective Oxidation ofn-Butane to Maleic Anhydride on Vanadyl Pyrophosphate
1997; Elsevier BV; Volume: 171; Issue: 2 Linguagem: Inglês
10.1006/jcat.1997.1814
ISSN1090-2694
AutoresK. Aı̈t-Lachgar, M. Abon, J.C. Volta,
Tópico(s)Polyoxometalates: Synthesis and Applications
ResumoA pure and well-crystallized (VO)2P2O7catalyst was oxidized under an oxygen flow at 500°C for different times up to 24 h. These samples were characterized by TGA–DTA, XRD, UV–VIS spectroscopy, and31P NMR. Their catalytic performances were compared in the selective oxidation ofn-butane to maleic anhydride (MA) as a function of the time of oxidizing pretreatments. The sample oxidized for 1 h displayed an important increase in MA selectivity (from 52 to 84%), whereas the activity remained virtually nonaffected. These results have been discussed in relation with the development of a proper density of selective VVspecies associated with the creation of structural disorder in the pyrophosphate lattice.
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