LIQUID-PHASE HYDROGENATION OF BENZENE OVER HYBRID NICKEL AND PALLADIUM NANOCATALYSTS

Abstract

The present work is devoted to the process of benzene hydrogenation to cyclohexane using nanocatalysts based on the natural mineral clinoptilolite, as well as transition metals nickel and palladium on a polymer support. Polymer-immobilized metal complexes show high efficiency and better reproducibility. Hybrid nanocomposites based on the natural mineral and metal-organic polymer complexes are expected to exhibit higher efficiency due to their polyfunctionality. Besides, the addition of the mineral clinoptilolite to the structure of the metal-polymer complex can probably improve the selectivity of the reaction, increasing the yield of the target product. In this work, the catalytic activity of catalysts of the following composition was investigated: 1) polyvinylpyrrolidone (PVP) – clinoptilolite (Kpl) (primary, decationized (DKKlp), dealuminated (DAKpl); 2) PVP-Kpl-Ni (5, 10, 15%); 3) PVP-Kpl-Pd (5, 10, 15%). It is shown that on DKKlp the yields of products, as well as the process rate, increase. On dealuminated forms of clinoptilolite, an increased rate is ob- served, but the catalyst activity decreases over time. On catalysts of the Ni/PVP-Kpl and Pd/PVP- Kpl compositions, better results were obtained with a metal content of 10%. Among all those studi- ed, the catalyst based on palladium showed the highest result.