Selective oxidation of propylene to acrolein by hydrothermally synthesized bismuth molybdates
Hydrothermal synthesis has been used as a soft chemical method to prepare bismuth molybdate catalysts for the selective oxidation of propylene to acrolein. All obtained samples displayed a plate-like morphology, but their individual aspect ratios varied with the hydrothermal synthesis conditions. Application of a high Bi/Mo ratio during hydrothermal synthesis afforded γ-Bi2MoO6 as the main phase, whereas lower initial bismuth contents promoted the formation of α-Bi2Mo 3O12. Synthesis with a Bi/Mo ratio of 1:1 led to a phase mixture of α- and γ-bismuth molybdate showing high catalytic activity. The use of nitric acid during hydrothermal synthesis enhanced both propylene conversion and acrolein yield, possibly due to a change in morphology. Formation of β-Bi2Mo2O9 was not observed under the applied conditions. In general, the catalytic performance of all samples decreased notably after calcination at 550 °C due to sintering.
Two bipyridyl complexes of molybdenum(III) have been prepared and characterised.The complexes have been assigned the formulae BipyH2 and on the basis of analytical, polarographic and EPR data.
Tuli, Neelam,Jha, Anita,Banerjee, Alok K.
p. 1004 - 1005
(2007/10/02)
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