Catalytic behaviour of Rh-supported catalysts on lamellar and zeolitic structures by anchoring of organometallic compound

摘要

Rhodium catalysts were prepared by hydrogen reduction at atmospheric pressure of a cationic organometallic rhodium complex and anchored onto lamellar and zeolitic products. The effect of the structure and characteristics of the support on metal load and dispersion was studied in the heterogeneous catalysts prepared. The new rhodium catalysts were applied in the hydrogenation of acetone. The reaction was carried out under milder conditions. The lamellar and zeolitic materials synthesized are suitable for preparing heterogeneous catalysts by anchoring an organometallic complex by ion exchange. A higher metal content was achieved in the supports with lamellar structures, while better dispersion was shown by the catalysts supported on zeolitic structures. Activity, selectivity and durability depend on the nature of the support used in the preparation of the catalyst. The acidic centres of the pillared montmorillonite favoured the formation of methyl isobutyl ketone, whereas the other heterogeneous catalysts favoured greater selectivity towards isopropanol.