Abstract
Three ZSM-5 catalyst samples synthesized using carbon nanotubes (ZSM-5/CNT), carbon nanofiber (ZSM-5/CNF) and graphene oxide (ZSM-5/GO) templates as well as one sample containing no template have been studied to study the effect of carbon nanostructured hard templates. The template in each sample was tetrapropylammonium hydroxide. The impact of each of the hard templates on the physicochemical properties of the synthetic samples was investigated via XRD, FESEM, BET, NH3-TPD and FTIR analyses. Moreover, the catalytic activity of the catalysts synthesized was compared in the methanol to olefin conversion (MTO) reaction at atmospheric pressure, temperature of 450 °C and WHSV of 8.0 h−1. Considering the results of the investigation of the physical properties, variations in the type of nanostructured carbon templates affect parameters such as cystallinity and mesoporosity. These differences result in different catalytic activity in the MTO reaction. Among the three carbon nanostructures used, graphene oxide was the most effective on the number of mesoporous cavities and pore sizes of ZSM-5 catalyst. The increased number of mesopores and modified acidity increase the selectivity of the catalysts and make their performance more appropriate.
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