Effect of chromium dopant towards the physical and chemical properties of vanadium phosphorus oxide Catalysts
TL;DRAbstract
0.1 wt%, 0.3 wt% and 0.5 wt% chromium-promoted VPO catalysts and unpromoted vanadyl pyrophosphate, VPO catalysts were synthesized via VOHPO4·1.5H2O precursor synthesis route. The samples were calcined in 0.75 % n-butane/air environment at 460°C for 24 hours and were denoted as BulkVPO, 0.1CrVPO, 0.3CrVPO and 0.5CrVPO. The physical and chemical properties were studied by XRD, BET, SEM-EDAX, redox titration and ICP-OES. Results from XRD analysis had found that the crystallite size of plane (2 0 4) had decreased from 111.3192 A to 95.5499 A. The specific surface area measured from BET analysis had shown increment from 8.76 m 2 g -1 to 27.32 m 2 g -1 as well with increasing promoter concentration. This corresponds to the XRD results that having decreasing crystallite size will mean having bigger specific surface area. Observation from SEM showed that all samples displayed plate-like crystals formed in rosette agglomerates. EDX study had detected the presence of vanadium and phosphorus in a
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0.1 wt%, 0.3 wt% and 0.5 wt% chromium-promoted VPO catalysts and unpromoted vanadyl pyrophosphate, VPO catalysts were synthesized via VOHPO4·1.5H2O precursor synthesis route. The samples were calcined in 0.75 % n-butane/air environment at 460°C for 24 hours and were denoted as BulkVPO, 0.1CrVPO, 0.3CrVPO and 0.5CrVPO. The physical and chemical properties were studied by XRD, BET, SEM-EDAX, redox titration and ICP-OES. Results from XRD analysis had found that the crystallite size of plane (2 0 4) had decreased from 111.3192 A to 95.5499 A. The specific surface area measured from BET analysis had shown increment from 8.76 m 2 g -1 to 27.32 m 2 g -1 as well with increasing promoter concentration. This corresponds to the XRD results that having decreasing crystallite size will mean having bigger specific surface area. Observation from SEM showed that all samples displayed plate-like crystals formed in rosette agglomerates. EDX study had detected the presence of vanadium and phosphorus in a
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