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Significance: A dual catalyst containing Pd and CuFe2O4 nanoparticles in a core/shell silica microsphere (SiO2@CuFe2O4-Pd) for selective hydrogenation of arylacetylenes to styrenes was described. A sequential modification of SiO2 with CuFe2O4 and Pd nanoparticles led to the formation of the dual catalyst SiO2@CuFe2O4-Pd. The hydrogenation of arylacetylenes was performed in hexane under H2 (1 atm) using SiO2@CuFe2O4-Pd to give the corresponding styrenes in 98–99% conversion with 73–98% selectivity. Comment: SiO2@CuFe2O4-Pd was prepared on the basis of the authors’ previous work (Chem. Mater. 2008, 20, 6738). The SiO2@CuFe2O4-Pd catalyst was recovered by using an external magnet and reused in the hydrogenation of phenylacetylene (1st use: 98% conversion, 98% selectivity; 2nd use: 99% conversion, 98% selectivity; 3rd use: 98% conversion, 97% selectivity). SiO2@CuFe2O4-Pd was characterized by powder X-ray diffraction, TEM, EDX, HR-SEM, ICP, fielddependent magnetization, etc. 1) Cu(NO3)2⋅2.5H2O, Fe(NO3)3⋅9H2O, Igepal CO-520, EtOH/n-octyl ether 363–573 K then dried at 353 K 2) annealed at 773 K SiO2 SiO2@CuFe2O4 SiO2@CuFe2O4-Pd : CuFe2O4 : Pd

Dual Pd and CuFe2O4 Nanoparticles in a Core/Shell Silica Microsphere