Jointlypublishedby Elsevier Sd~cm B.V., Amsterdam and Akacl6miai Kiad6, Budapest React.Kinet. Catal.Lett. Vol. 66, No. 2, 343-350 (1999) RKCL3390 STUDY OF ACID-BASE PROPERTIES OF A SiO2-AlPO4 (80:20 W/W) CATALYST M.A. Aramendia, V. Bor~iu, LM. Garcla, C. Jim6nez, A. Marinas, J.M. Marinas, A. Porras and F.J. Urbano Department of Organic Chemistry, University of Cordoba Avda. San Alberto Magno, s/n. E-14004 C6rdoba, Spain Received September 11, 1998 In revisedform November20, 1998 Accepted December 7, 1998 Abs~a~ 2-Methyl-3-butyn-2-ol (MBOH) transformation was used as a test reaction in order to determine the acid-base properties of a SiO2/AIPO4 (80:20 w/w) catalyst. Experiments were carried out in a microcatalytic pulse reactor and in a continuous-flow reactor via Temperature Programmed Surface Reactions-Mass Spectrometry (TPSR-MS). Results are compared to acid-base properties calculated by other instrumental techniques. Keywords: Test reaction, TPD-MS, acid-basic catalysts, SiOz-AIPO4 INTRODUCTION The acidity and basicity of solid catalysts are two influential factors in their activity and selectivity, not only in typical acid-base reactions, but also in many others involving redox transformations. Moreover, Tanabe [1,2] reported the importance of acid-basic pair sites on many catalytic processes. There are a number of methods for characterizing acid and basic sites, most of which have been reviewed [3]. In broad terms, they can be classified as titration, spectroscopic and test reaction methods. The determination of acid-base properties in solid catalysts has been addressed by using a variety of model reactions involving t-butanol [4], methylbutynol [5-7], isopropyl alcohol [8-9], 0133-1736D9/US$12.00. 9 Akad6miai Kiad6, Budapest. All rights resexve~