Toluene disproportionation was performed at 300°-360°C in a fixed-bad reactor (carrier H2) over samples of HZSM-5 differing in surface acidity, organic compound used for the synthesis, crystal size and procedure used for decationation. Xylene isomers in the product were in equilibrium ratios. The catalyst activity was found to be clearly dependent on surface acidity. An interpretation is given, in terms of a slow toluene disproportionation within the zeolite pores, followed by fast xylene isomerization on the external surface. Measurements of the reaction rate at 300°C over one of the catalysts confirmed a kinetic model as previously suggested.
COMPARISON OF DIFFERENT SAMPLES OF HZSM-5 AS CATALYSTS FOR TOLUENE DISPROPORTIONATION / P. Beltrame, P. Carniti, G. Zuretti, G. Leofanti, E. Moretti, M. Padovan. - In: ZEOLITES. - ISSN 0144-2449. - 7:5(1987), pp. 418-422. [10.1016/0144-2449(87)90007-8]
COMPARISON OF DIFFERENT SAMPLES OF HZSM-5 AS CATALYSTS FOR TOLUENE DISPROPORTIONATION
P. BeltramePrimo
;P. Carniti;
1987
Abstract
Toluene disproportionation was performed at 300°-360°C in a fixed-bad reactor (carrier H2) over samples of HZSM-5 differing in surface acidity, organic compound used for the synthesis, crystal size and procedure used for decationation. Xylene isomers in the product were in equilibrium ratios. The catalyst activity was found to be clearly dependent on surface acidity. An interpretation is given, in terms of a slow toluene disproportionation within the zeolite pores, followed by fast xylene isomerization on the external surface. Measurements of the reaction rate at 300°C over one of the catalysts confirmed a kinetic model as previously suggested.
Pubblicazioni consigliate
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
