(79b) Deactivation of Zeolite Catalysts during Hydrodeoxygenation of Aromatic Oxygenates
Here, we show that additional deactivation paths need to be considered. Bifunctional aromatics, like catechol and guaiacol, can strongly adsorb on Lewis acid sites and form rigid surface species, so-called roadblocks, that prevent access to active sites . Roadblocks can drastically reduce the activity of zeolite catalysts even when only a fraction of the pore space and external surface area are occupied. In addition, dealumination processes during HDO will be discussed. The same deactivation phenomena occur during the conversion of pyrolysis vapors from pine indicating that model compound studies allow for accurate prediction of deactivation phenomena of zeolites in HDO reactions . Based on these results, strategies for improving the design of HDO catalysts and processes will be discussed.
 Foo, G. S.; Rogers, A. K.; Yung, M. M.; Sievers, C. ACS Catalysis 2016, 6, 1292â1307.
 Yung, M.M., Foo, G.S., Sievers, C. Catal. Today, accepted.