Add time:08/10/2019         Source:sciencedirect.com

Synthesis of lower olefins from biomass is an attractive area of research as the petroleum feedstocks are limited day to day. A fullerene [C60] based niobium phosphate acid catalyst has been tested for isopropanol dehydration in gas phase for production of propylene and a thorough study has been undertaken on its recyclability. The physicochemical properties of the catalyst before and after reaction have been studied by several techniques, namely FTIR, FESEM, BET surface area, HRTEM, NH3-TPD, TGA, XRD and O2-TPO. The BET result suggests the trapping of coke within the micropores which retard the catalytic activity. Interestingly, the NH3-TPD profile demonstrates the abrupt increase in acidity of the used catalyst due to the widening of narrow pores while, CP-MAS 31 P NMR spectra show increase in population of hydrogen phosphate species may be caused by the decomposition of surfactant phosphoric acid complex. However, the UV–vis spectra support structural change by the oxidation of fullerene during regeneration leads to decrease in the acidity. The catalytic activity is evaluated in the temperature range 453–573 K, shows consistent performance up to 6th regenerated cycle with low activation energy (30 ± 5 kJ/mol). Furthermore, a detailed discussion of the reaction kinetics and reaction mechanism has also been demonstrated.

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