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- W78820791 abstract "V -Sb-oxide catalysts are commercially viable catalysts for the ammoxidation of propaneto acrylonitrile, a novel and considerable cost saving route compared to the currentindustrial method which utilizes the ammoxidation of propene. The characteristic of VSb-oxide catalysts were studied and analyzed in relation to their structural/compositionfeatures using X-ray diffraction (XRD), Fourier Transform Infrared (FTIR), Brunauer-Emmett-Teller (BET) surface area, Scanning Electron Micrograph (SEM), EnergyDispersive X-ray (EDX) microanalysis and Thermogravimetric Analysis (TGA).Results showed significant difference in presence of crystalline phases, surface area,porosity and morphologies in the samples prepared according to three different methods,i.e. solid state (88) reaction, sol-gel (G8) and deposition on antimonic acid (DAA)methods, as a function of the Sb:V ratio and heat treatment. XRD and FTIR studiesrevealed that the calcination temperature at 500°C is not suitable for the V -Sb-oxidecatalysts as there is little or no VSb04 formed in some samples. Sb/V ratio of2 or moreis recommended for the GS method as there is hardly any Sb species formed for samples with 5bN ratio = 1. For the 55 method, sample calcined at 700°C with SbN ratio = 1would be deemed the best as it has the highest amount of VSb04• Raising of calcinationtemperature had a detrimental effect on the surface area of the GS and DAA catalystsbut bore no significant effect on SS catalysts. The EDX microanalysis showedantimony enrichment on the surface the catalysts. The study of TPD revealed theevolution of lattice oxygen from the catalysts. In TPR, the amount of oxygen desorbedfrom the catalysts prepared by SS method is found to be much higher compared to theother methods, i.e. about 16.7 times higher than GS method and 6.3 times higher thanDAA method (for SbN = 1) whilst for ratio 3, it is 21.3 times higher than GS methodand 14.5 times higher than DAA method." @default.
- W78820791 created "2016-06-24" @default.
- W78820791 creator A5038206857 @default.
- W78820791 date "2002-03-01" @default.
- W78820791 modified "2023-09-27" @default.
- W78820791 title "Synthesis and Characterisation of Vanadium Antimony Oxide Catalysts" @default.
- W78820791 hasPublicationYear "2002" @default.
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