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INFLUENCE OF THE NATURE OF AROMATIC POLYMER AS A PT PARTICLE STABILIZER ON ITS ACTIVITY AND SELECTIVITY IN THE LIQUID-PHASE HYDROGENATION OF AROMATIC AND POLYAROMATIC SUBSTRATES
Abstract
A series of platinum catalytic systems stabilized in aromatic polymers were obtained in this work. Commercially available styrene-divinylbenzene (MN100) and polymers synthesized by one-stage crosslinking by the Friedel-Crafts reaction from benzene, naphthalene, and an equimolar benzene-naphthalene mixture were used as polymers. The obtained systems were tested in liquid-phase hydrogenation reactions of benzene, toluene, and benzene-toluene mixture, as well as anthracene in a dodecane medium. The reaction products were studied using GC-MS. Polymers and catalytic systems were studied using diffuse reflection IR spectroscopy, XPS, low-temperature nitrogen physisorption, thermogravimetry coupled with mass spectrometry, and TEM. The study of polymers by XPS and FTIR showed the presence of oxygen-containing functional groups with a similar nature in all polymers. The range of thermal stability of polymers was determined. The catalytic activity of 1%Pt/polymer systems in liquid-phase hydrogenation of solutions of pure benzene, toluene, and anthracene in dodecane, as well as an equimolar benzene-toluene mixture in dodecane, were compared. The dependence of the reaction rate, as well as the selectivity in the case of anthracene, on the nature of the aromatic blocks in the polymer matrix, was shown. The selectivity for cycloalkanes during hydrogenation of mononuclear arenes was 100%, regardless of substrate conversion. The selectivity of obtaining 9,10-dihydroanthracene at 90% anthracene conversion was found to be above 80% for all studied systems. In addition, the possibility of obtaining smaller diameter metal particles in the synthesized polymers in comparison with the industrial polymer MN100 was shown.
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