Selective oxidation of aromatic sulfides with molybdenum based catalysts supported on modified kaolinite

AIDA GUTIÉRREZ ALEJANDRE; MARÍA A. GALLO; DELIA GAZZOLI; MERCEDES MUÑOZ; CARMEN I. CABELLO

Beijing

Congreso; 16th International Congress on Catalysis (ICC 16); 2016

Chinese Academy of Science

1. Introduction The oxydesulphurisation (OSD) process is a promising method to reduce sulphur content in fuels using mild operating conditions and no H2 consumption in presence of homogeneous or heterogeneous acid catalysts1. Among materials acting as supports, clays have attracted much interest due to their adsorption, ion exchange properties and high surface areas2. In this work natural kaolinite, 1:1 dioctahedral layered compound (ideal composition: Al4Si4O10(OH)8), has been selected as support for molybdenum-based catalysts. Materials suitable for acid catalytic applications can be obtained from kaolinite by treatments with acid solutions and/or chemical modifications. As a result, the surface properties (Lewis and Brønsted sites) can be tailored to obtain promising systems for different catalytic reactions including organic selective oxidation and fine chemistry syntheses. The aim of this work was the preparation and characterization of acid catalysts obtained by grafting Mo-containing iso- and heteropolyanions on modified natural kaolinite and the evaluation of their catalytic performances in the selective oxidation of diphenilsulfide (DPS) to sulfoxide (DPSO) and/or sulfone (DPSO2) using H2O2 as the oxidizing agent.