Synergistic Effect of Ethylene Glycol and Active Surface Group of SBA-15 under Ultrasound to Improve Catalytic Properties of Pd/SBA-15

Abstract

Using ultrasonic methods in preparation of noble metal nanocatalysts is a hot spot in catalysis. In this paper, the synthesis of mesoporous material SBA-15 supported palladium catalyst Pd/SBA-15 was done by ultrasound assisted reduction and the synergistic effect between reductant and SBA-15 under ultrasound was discussed. The interaction of reductant ethylene glycol and active surface groups of SBA-15 under ultrasound led to the change in structure and surface properties of SBA-15, so that oxygen element in the structure of SBA-15 could chelate with palladium ions during impregnation, leading to the in-situ reduction of palladium nanoparticles(PdNPs) inside SBA-15. The obtained PdNPs in Pd/SBA-15 had a narrow size distribution and an average diameter of 2.98 nm. The yield of Suzuki coupling reaction between 4-bromotoluene and phenylboronic acid catalyzed by the prepared Pd/SBA-15 catalyst was 98.01%. And the results of recycle test proved the strong stability of Pd/SBA-15.