A Study of Platinum Supported on Tungstated Zirconia Catalysts

LARSEN, G; LOTERO, E; RAGHAVAN, S; PARRA, RD; QUERINI, CA

APPLIED CATALYSIS, A. GENERAL

Año: 1996 vol. 139 p. 201 - 211

The reaction of n-butane with hydrogen at 573 K was studied over platinum supported on tungstated zirconia (PtWZ). A higher Pt dispersion increases the selectivity toward hydrogenolysis products and overall activity. The % coke after 90 rain on stream at a Hz/n-C 4 ratio of 3 was found to be less than 0.1 wt.-% in all cases. The presence of Br~nsted acid sites upon reduction is confirmed by diffuse reflectance infrared spectroscopy of adsorbed pyridine. The WO3/ZrO 2 (WZ) support consists of a mixture of tetragonal and monoclinic zirconia and tetragonal tungsten oxide regardless of the presence of platinum.at 573 K was studied over platinum supported on tungstated zirconia (PtWZ). A higher Pt dispersion increases the selectivity toward hydrogenolysis products and overall activity. The % coke after 90 rain on stream at a Hz/n-C 4 ratio of 3 was found to be less than 0.1 wt.-% in all cases. The presence of Br~nsted acid sites upon reduction is confirmed by diffuse reflectance infrared spectroscopy of adsorbed pyridine. The WO3/ZrO 2 (WZ) support consists of a mixture of tetragonal and monoclinic zirconia and tetragonal tungsten oxide regardless of the presence of platinum.