Following the crystallisation of Bi2Mo2O9 catalyst by combined XRD/QuEXAFS
The formation ofβ-phase Bi2Mo2O9 catalyst from a precursor precipitate has been studied using thein situ combined XRD/QuEXAFS technique and DSC during calcination. Accordingly the precursor was observed to undergo a number of changes in both the molybdenum (VI) coordination and long-range ordering during this heating. Initially the two other forms of bismuth molybdate (α-andγ-phases) were observed to form from the poorly crystalline precursor at about 230°C, however, theβ-phase eventually crystallised after prolonged heating at 560°C.
KeywordsBi2Mo2O9 catalyst XRD/QuEXAFS long-range
Unable to display preview. Download preview PDF.
- 5.Teller R G, Brazdil J F and Grasselli R K 1984Acta Crystallogr. C40 2001Google Scholar
- 7.Thomas J M and Thomas W J 1997Principles and practice of heterogeneous catalysts (New York: VCH)Google Scholar
- 8.Aurivillius B 1951Ark. Kemi. 2 519Google Scholar
- 10.Hearne G W and Adams M 1948US Patent 2,451,485Google Scholar
- 11.Standard Oil Co 1964GB Patent 965,173Google Scholar
- 12.McClellan W R and Stiles A B 1972US Patent 3,678,139Google Scholar
- 13.Grasselli R K, Suresh D D and Friedrich M S 1984US Patent 4,424,141Google Scholar
- 14.Sasaki Y, Mori K and Moriya K 1990EP Patent 0,389,255Google Scholar
- 15.Sasaki Y, Mori K and Moriya K 1990EP Patent 0,383,598Google Scholar
- 16.Kope J, Kripylo P, Hohlstamm I, Hoepfner R, Knaack K E and Mai H G 1993DE Patent 4,124,666Google Scholar
- 17.Izumi J, Watanabe S and Yoshioka H 1997EP Patent 0,799,642Google Scholar
- 18.Schirmann J P, Descat G, Etienne E, Pham C and Simon M 2000FR Patent 278,251,2Google Scholar