ISSN:
1572-9028
Keywords:
Wells–Dawson heteropoly compound
;
oxidative dehydrogenation of isobutane
;
isobutene synthesis
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract The thermal stability of the Wells–Dawson heteropoly compound K6P2W18O62·10H2O was examined under both reducing and oxidizing conditions, and its structural and morphological evolution was characterized by several complementary solid state techniques. It is shown that the primary structure of the title compound remains intact up to 770 K, while at higher temperature structural changes and rearrangements are observed. These modifications depend considerably on the treatment conditions and catalyst composition. Under oxidizing conditions the Wells–Dawson compound rearranges with formation of a mixed phase containing the Keggin-type unit K3PW12O40 and the hexatungstate K2W6O19. Furthermore, the catalytic activity in the oxidation of isobutane is affected considerably by these changes. The best catalytic performance was shown by the rearranged Wells–Dawson compound.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1019187211613
