Nuevos catalizadores de reformación de naftas

V.A. MAZZIERI; J.M. GRAU; C.R. VERA; J.C. YORI; J.M. PARERA; C.L PIECK

Santa Fe, Argentina

Congreso; XIV Congreso Argentino de Catálisis; 2005

INCAPE - INTEC

The catalytic reforming of n-heptane was studied on mono (0.3Pt), bi (0.3Pt-xRe, x=0.1, 0.3, 0.9 and 2.0), sulfided) and trimetallic (0.3Pt-0.3Re-ySn, y=0.1, 0.3, 0.6 and 0.9, without sulfiding) catalysts. The metallic function is supported on chlorided alumina: the acid function. The reaction was performed in a flow reactor, at atmospheric pressure, 450ºC, H2/n-C7=4 and WHSV=7.3. It was found that the best bimetallic is 0.3Pt-0.3Re with 0.06% sulfur, that, to its known great stability is added its great i-heptane/toluene ratio, which is beneficial to fulfil ambient regulations on reformulated gasolines. The best trimetallic is 0.3Pt-0.3Re-0.6Sn, that has similar performance to the one of sulfided 0.3Pt-0.3Re, but with greater stability and without the need of sulfidation. Tin simultaneously affects both, the metal and the acid functions, decreasing them and producing a convenient metal/acid ratio for catalytic activity, selectivity and stability. It was concluded that it is possible to prepare trimetallic reforming catalysts Pt-Re-Sn/Al2O3 with performance even better than the one of sulfided Pt-Re, without the need of the complicated sulfidation. This simplify the operation and allows its use in processes operated in a continuous form.