Texture of dealuminated mordenite catalysts modified with cerium and catalytic properties in the isopropylation of biphenyl

摘要

Formation of dispersed phase of ceria was registered by XRPD in the dealuminatedmordenites modified with ceria/cerium. Decrease in acidity at increased content of ceria maybe prescribed to ion-exchange of protons with cerium cations at temperature of about 500 ℃and dry air stream. Non-uniform dealumination, i.e., more extensive close to the surface wasreflected by the higher proportion of exchanged cationic positions in the origin mordenite. Anextra mesoporous structure of ceria at higher metal loading (more than 10 wt. %) was found.On one side, a lower acidity and narrower channels of catalysts resulted in the lower catalyticactivity, on the other side higher selectivity to the desired 4,4'-dialkylated biphenyl wasachieved.