Ordered alloys, also known as intermetallic compounds, work as highly efficient heterogeneous catalysts for various catalytic reactions such as selective hydrogenation and oxidation, where the corresponding monometallic catalysts show very low catalytic activities and selectivities. The formation of ordered alloy phase drastically modifies the electronic and geometric factors of the materials, which enhances the desired reaction pathways and/or inhibits the undesired side reactions. In addition to the conventional ligand and ensemble effects on alloying, we discovered a novel effect, which we coined "steric effect". This effect appears only on bimetallic surfaces with highly ordered atomic arrangement such as RhSb(020), RhIn(110), and RhBi(110) planes, where the sophisticated steric restriction is imposed to surface reaction and reactant adsorption. This effect allows various challenging molecular transformation such as stereoselective isomerization of alkenes, regioselective hydrogenation of dienes, and chemselective hydrogenation of nitroarenes.<br/>

Highly efficient molecular transformation using ordered alloys as catalysts

255th National Meeting (2018)

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