III International Conference

PP-I-14PROPAN-2-OL CONVERSION TO DIISOPROPYL ETHER OVER SUBSTITUTEDPHOSPHOMOLYBDATE HETEROPOLYCOMPOUNDSChami F., Rabia C.Laboratoire de Chimie du Gaz Naturel, Faculté de Chimie, BP32, El-Alia, 16111,Bab-Ezzouar, Alger, AlgérieE-mail: c_rabia@yahoo.frDue to the necessity of environment protection, gasoline composition has to be changed.Adding oxygenated compounds, mostly C 2 -C 4 alcohols, methyl tert-butyl, diisopropyl andtert-amyl methyl ethers to motor fuels, is a part of the program of gasoline reformulation.Ethers increase the octane number, reduce the emissions of gases to greenhouse effect (CO xand NO x ). Their introduction in the composition of gas also permits, to decrease the quantityof the products as the aromatic hydrocarbons and the alkenes, in particular C 4 -C 5 .Industrial sulfocationites and ion exchange resins used as catalysts in ether synthesisshow many advantages. However, they have poor thermal and mechanical stability [1, 2]. Apotential route that received attention is the substitution of these catalysts by Keggin typeheteropolycompounds.In this work, the propan-2-ol conversion to diisopropyl ether (DIPE) was studied overammonium substituted heteropolycompounds with (NH 4 ) x X y PMo 12 O 40 formula whereX n+ =Sb 3+ , Bi 3+ , Sn 2+ at 100°C. The obtained results have shown that alcohol reactivitydepends on the pre-treatment temperature and composition of solid.For the whole catalysts and at all pre-treatment temperature (150-250 °C) the dehydrationof propan-2-ol produced DIPE and propene.High both activities and selectivity to DIPE were obtained in presence of(NH 4 ) 2,55 Bi 0,15 PMo 12 O 40 and (NH 4 ) 0,63 Sb 0,79 PMo 12 O 40 salts.References:1. R. Pla, J. Tejero, F. Cunill, J. F. Izquierdo, M. Iborra and C. Fité. Stud. Surf. Sci. Cat., 130C(2000) 2609.2. T. Jarecka, St. Miescheriakow, J. Datka, Stud. Surf. Sci. Cat., 130C (2000) 2615.33