(574e) Lewis Acid Zeolite Catalysts for Tandem Diels-Alder Cycloaddition and Dehydration of Dimethylfuran and Ethylene to Renewable p-Xylene
In this study,1 Lewis acid zeolites including Zr-, Sn-, and Ti-BEA were examined for tandem [4 + 2] Dielsâ??Alder cycloaddition of 2,5-dimethylfuran (DMF) and ethylene to form cycloadduct, which is further dehydrated to produce biorenewable p-xylene. p-Xylene is currently produced from petroleum processing, which serves as a precursor for polyethylene terephthalate (PET) polymers (e.g. PET bottle). Zr-BEA (Si/Zr = 168) offered superior performance with improved recalcitrance to deactivation, because of its low activity for the DMF oligomerization.2 Zr-BEA also achieved the highest selectivity to p-xylene of 80% at 99% conversion of DMF. In the case of low catalyst loading, the reaction rate of p-xylene production was linearly proportional to the number of Lewis acid sites, whereas high catalyst loading was independent of Lewis acid sites. These findings were similar to the behaviors of Brønsted acid zeolite catalysts.
C.-C. Chang, H. J. Cho, J. Yu, R. J. Gorte, J. Gulbinski, P. Dauenhauer and W. Fan, Green Chem., 2016, 18, 1368
J. Yu, S. Zhu, P. Dauenhauer, H. J. Cho, W. Fan and R. J. Gorte, Catal. Sci. Technol., 2016, DOI: 10.1039/C6CY00501B