ELEMENTARY REACTIONS AND THERMODYNAMIC EFFECTS IN THE CONVERSION OF PROPENE OVER AN ACIDIC ALMFI

The conversion of propene over H-AlMFI zeolites was investigated at va rious temperatures and subatmospheric pressure. The overall conversion scheme was cracked down into a set of well known reactions: namely a primary dimerization step, two secondary or tertiary disproportionatio n reactions involving intermediate carbenium ions within the C-6-C-9 r ange and, in addition, a number of hydrogen transfer reactions. Quanti tative analysis of the product distributions provided an evaluation of the relative weight of each step depending on the temperature. The va riation of the overall conversion with temperature was interpreted in terms of a thermodynamically limited process above 573 K.