A. Noomnual, S. Pithakratanayothin, T. Chaisuwan, S. Wongkasemjit
Keywords: nickel-tin intermetallics, chemical reaction
Summary:Ni3Sn, Ni3Sn2, and Ni3Sn4 intermetallics, novel alloys, were synthesized via mechanical alloying technique, economical and environmentally friendly method. With different contents of nickel and tin, 43, 58, 73% of tin contents, Ni3Sn, Ni3Sn2, and Ni3Sn4, respectively, were prepared. These intermetallics were characterized by X-ray diffraction (XRD) and transmission electron microscope (TEM). As catalysts, the activity of NixSny intermatallics were studied in terms of chemical reactions using cinnamaldehyde, versatilely natural oil, as a substrate. Moreover, formic acid was considered to be used as a hydride donor and also as a co-catalyst in order to obtain cinnamyl alcohol. In this work, the optimal time, temperature, amount, and type of NixSny intermetallics as well as amount of formic acid were investigated. The results revealed that Ni3Sn4 had the highest turnover number (TON) of 3.7 comparing with Ni3Sn2 and Ni3Sn (TON = 1.8 and 1.4, respectively) under the optimal conditions of 60 ˚C for 3 h using tetrahydrofuran as solvent. The final products of cinnamyl alcohol, hydrocinnamaldehyde, cinnamic acid, and benzaldehyde detected by Gas chromatography-flame ionization detector (GC-FID) were obtained. The selectivity directly affected by the tin content.