The title reaction has been studied on various HY-based catalysts. Surface acidity has been evaluated by adsorption microcalorimetry and FTIR analysis, using pyridine as probe molecule. Catalytic tests were carried out at 623 K and 40 bar in liquid phase, with decalin as solvent, in flow reactor. Isopropylation is accompanied by oligomerisation/cracking of the reactant alcohol, cracking of the solvent, isomerization of the products of the main reaction. Pore filling by coke is fast for non-dealuminated HY, where naphthalene conversion remains high due to the occurrence of transalkylation between polyisopropylnaphthalenes trapped in the pores and naphthalene; this does not occur on dealuminated HY, owing to the low density of the acid sites and the presence of a secondary mesoporous system which allows easy diffusion of the reaction products in the zeolite pores. (C) 1998 Elsevier Science B.V.
|Titolo:||Liquid-phase alkylation of naphthalene by isopropanol over zeolites. Part 1: HY zeolites|
|Parole Chiave:||Acidity of HY zeolites; HY zeolites; Isopropylation; Naphthalene; Transalkylation|
|Settore Scientifico Disciplinare:||Settore CHIM/02 - Chimica Fisica|
|Data di pubblicazione:||1998|
|Digital Object Identifier (DOI):||10.1016/S0926-860X(97)00346-3|
|Appare nelle tipologie:||01 - Articolo su periodico|