Platinum catalyst sepiolite

Platinum-titania-sepiolite monolithic catalysts for the reduction of nitric oxide with propene in lean-burn conditions... 

The results of this study have been divided into four sections. In the first, the influence of the titania nature and sepiolite content on the catalysts activities were studied. The second deals with the influence of the heat pretreatment on both the textural properties of the support and activity of the catalysts. The phase distribution of platinum on the titania-sepiolite supports... 

The activities of the catalysts prepared with the five titanias containing 0.1 wt.% Pt supported on 50 50, wt/wt, titania-sepiolite monoliths are shown in Figure 1. These displayed variations of the maximum conversion, by more than 15%, and maximum conversion temperature, of 25 °C. As all supports used were prepared with the same sepiolite content and the same platinum quantity, the activity differences might be attributed to the differences in the titanias used in the support preparation. 

This new single-step synthesis unites the simplicity of preparation and lower production costs, with the outstanding properties of the final catalysts. By the single-step procedure proposed here, deposition of dispersed nanoparticles of noble metals on ceramic supports with customised textural properties and shape was achieved. Noble metals including platinum, palladium, rhodium, ruthenium, iridium, etc. and metal oxides including copper, iron, nickel, chromimn, cerium oxides, etc on sepiolite or its mixtures with alumina, titania, zirconia or other refractory oxides have been also studied. 

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