Abstract
The influence of high content of MoO 3 (32 mol%) in V 2 O 5 –MoO 3 –P 2 O 5 catalyst system supported on alumina, silica, HZSM-5 and modified clay was investigated for ammoxidation of 3-picoline. Unsupported VMPO catalyst and supported catalysts were prepared by incipient wet impregnation method keeping the mole ratio of V 2 O 5 –MoO 3 –P 2 O 5 (1.00:3.27:0.14) constant. FT-IR spectra and X-ray diffractograms showed interaction among the active oxides and the support. The major phases identified were Mo 4 V 6 O 25 , Mo 6 V 9 O 40 and MoV 2 O 8 . TG–DTA also showed the exothermic peaks indicating the formation of new compounds above 400 ° C. The physico-chemical properties of the catalysts were correlated with their activity and selectivity for ammoxidation of 3-picoline. The unsupported catalyst showed 96.0% selectivity whereas VMPO/HZSM-5 showed the highest selectivity (91.3%) amongst the supported catalysts. The influence of high content of MoO 3 (32 mole%) in V 2 O 5 -MoO 3 -P 2 O 5 catalyst system supported on alumina, silica, HZSM-5 and modified clay was investigated for ammoxidation of 3-picoline. Major intermediate phases identified are Mo 4 V 6 O 25 , Mo 6 V 9 O 40 , MoV 2 O 8 . FT-IR spectra and X-ray diffractograms showed interaction among the active oxides and the support. The physico-chemical properties of the catalysts were correlated with their activity and selectivity for ammoxidation of 3-picoline.
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