Facile synthesis of porous Pd nanoflowers with excellent catalytic activity towards CO oxidation

摘要

Microorganism-mediated,hexadecyltrimethylammonium chloride(CTAC)-directed(MCD) method was employed in this work to synthesize Pd nanoflowers(PdNFs).Proper Pichia pastoris cells(PPCs) dosage,ascorbic acid(AA),Pd(NO_3)_2 and CTAC concentrations were essential for the growth of the PdNFs.The size of the assynthesized PdNFs could be tuned by adjusting the amount of Pd(NO_3)_2 solution and dosage of PPCs used.Characterization techniques such as X-ray diffraction,transmission electron microscopy,and X-ray photoelectron spectroscopy were used to verify the nature of the PdNFs.Finally the PdNF/PPC nanocomposites were immobilized onto TiO_2 supports to obtain bio-PdNF/TiO_2 catalysts which showed excellent catalytic activity for CO oxidation,obtaining 100%conversion at 100℃ and remaining stable over a period of 52 h of reaction time.