Abstract: The influence of pretreatments of the carbon surface and reduction conditions of adsorbed platinum precursor on the Pt particles blocking in the carbon pores has been analyzed. The catalysts prepared by adsorption of H2PtCl6 on activated carbons with different pore structure and surface chemistry were characterized by TPR, TEM, CO chemisorption and tested in cyclohexene hydrogenation. The treatment of the microporous carbon with oxygen or hydrogen at elevated temperature decreased the platinum blocking in the pores of the support. With the proper conditions of acid/base pretreatments, it was possible to decrease the blocking of platinum nanoparticles. The metal dispersion and extent of the blocking increased with increasing flow rate of hydrogen. Drying in He at 523 K was accompanied by the reduction of platinum, growth of particles and weakening blocking effect. Effect of acid/base treatments of carbons and reduction conditions proved significant for Pt/C catalysts on the activated carbons with the smaller micropores and higher concentration of oxygen-containing groups.

Cite: Okhlopkova L.B. , Chuvilin A.L.
Blocking Effect of Platinum Nanoparticles in the Carbon Pores. Influence of Pore Structure, Pretreatments of the Carbon Surface and Reduction Conditions
In compilation Current Issues in Organic Chemistry. – Heron Press., 2010. – C.59-69.

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