Preparation of Organobimetallic and Bimetallic Catalysts

Obtaining a well-defined organobimetallic phase is a key step towards the generation of high-performance catalytic materials. As can be seen in the literature, this type of preparation should be carefully carried out, avoiding the exposure of the involved precursors to the atmosphere [16, 31, 32, 49, 50], 

The results presented here refer to monometallic catalysts employed in a reduced state. After the reduction step, the monometallic catalysts M/support (M = Pt, Ni, Cu, Rh support = Si02, AI2O3) are cooled to between 298 and 423 K, and at this point the reaction between the monometallic catalyst and the organotin compound SnR4 (R = butyl, menthyl) takes place. 

The two-step anchoring process to prepare the so-called MSn-OM and MSn-BM catalysts can be represented by Equations 6.1 and 6.2  

Once Equation 6.1 is complete, the catalyst is washed with several portions of n-heptane and dried at 378 K in Ar flow. In this way, the supported organobimetalHc catalysts are obtained, which are designated MSn-OM. The preparation 

Organobimetallic systems obtained in this way are the precursors of the bimetallic catalysts. These bimetallic catalysts arise from the treatment of these phases in hydrogen between 423 and 773 K, for 2h (Equation 6.2). The bimetallic systems are designated MSn-BM . 

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