Surface organometallic chemistry on metals

摘要: Bimetallic catalysts RhSn, NiSn and RuSn, prepared via an organometallic route, are very selective for the hydrogenolysis of ethyl acetate to ethanol. This generation catalysts, requires lower temperatures pressures than traditional copper chromites constitutes elegant method (fatty) esters into alcohols, which important raw materials derived from natural resources. The objective this work was identify, kinetic experiments, primary products reaction in order propose a mechanistic explanation hydrogenation Changing Sn/Rh ratio drastically modifies both activity selectivity catalysts: In range 0 < 0.2, CO CH4 decrease. On other hand, ratios higher ca. ethanol formation increase almost linearly with tin content while rates alkane remain constant low. At = 1.7, studies indicate that ethanol, acetaldehyde ethane products, whereas secondary products. rate low, is form: r k(PH2)0.5KEAPEA/(1 + KEAPEA KEPE) is totally different observed on pure rhodium. These data, associated previous physical observations leading concept ‘site isolation’ rhodium atoms matrix atoms, lead proposal mechanism involving single atom.