ISSN:
1572-9028
Keywords:
antimony rhenium mixed oxide
;
selective oxidation of isobutylene to methacrolein
;
confocal Raman microscopy
;
scanning electron microscopy
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract The catalytic performance of a novel SbRe2O6 compound has been investigated in the selective oxidation of isobutylene to methacrolein at 673 K. The initial reactivity of the catalyst strongly depended on catalyst pretreatment conditions. The catalyst was more active after pretreatments under more oxidative atmospheres. However, the activity of the catalyst always reached an identical level at the steady state, independent of the pretreatment conditions. Scanning electron microscopy and in situ confocal Raman microscopy revealed that the reactivity of SbRe2O6 was attributable to the presence at its surface of Re2O7 which benefitted from a cooperation with Sb4Re2O13. The two phases resulted from a partial decomposition of SbRe2O6 in the presence of oxygen. When deposited on Sb4Re2O13, Re2O7 was stabilized and did not volatilize under the reaction conditions. The phenomenon is likely the origin of the cooperation between Sb4Re2O13 and Re2O7.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1027283427485
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