Kinetics of propylation of benzene over H-beta and SAPO-5 catalysts: a comparison

• Published in: Journal of molecular catalysis. A, Chemical Vol. 181; no. 1; pp. 257 - 262
• Main Authors: Sridevi, U, Bokade, V.V, Satyanarayana, C.V.V, Rao, B.S, Pradhan, Narayan C, Rao, B.K.B
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 25.03.2002; Elsevier
• Subjects: Benzene; Catalysis; Catalytic reactions; Chemistry; Cumene; Exact sciences and technology; General and physical chemistry; H-beta; Isopropylation; Kinetics of isopropylation; SAPO-5; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; H-beta; Cumene; Isopropylation; Benzene; SAPO-5; Kinetics of isopropylation; Heterogeneous catalysis; Hydrocarbon; Kinetics; Zeolite; Alkylation; Catalyst; Comparative study; Molecular sieve
• ISSN: 1381-1169; 1873-314X
• DOI: 10.1016/S1381-1169(01)00370-3

A comparative study of the reaction kinetics involving the vapour phase isopropylation of benzene with iso-propanol over H-beta and SAPO-5 catalysts is taken up to evaluate the performance of these two potential catalysts for the industrially important cumene synthesis. Their activity is compared in the temperature range 378–513 K. A lab scale fixed bed flow reactor was used at atmospheric pressure for the experiments. Power law equation assuming pseudo first-order kinetics for iso-propanol conversion fit the data reasonably well. Kinetic parameters such as activation energy ( E a) and Arrhenius frequency factor (ln A 0) for the disappearance of iso-propanol over a series of SAPO-5 molecular sieves with varying acidity and over zeolite beta have been evaluated at 383 K. The reaction rate on beta is higher than that of the most active SAPO-5 catalyst at the same temperature. The existence of the compensation effect between E a and ln A 0 has been tested over the SAPO-5 catalysts.