氮化碳负载AuPd纳米催化剂甲酸分解制氢性能

AuPd nanoparticles supported on graphitic carbon nitride for hydrogen generation from formic acid

以氮化碳为载体,采用液相还原的方法制备了不同AuPd比例的AuxPd1-x/CN催化剂,并将催化剂用于甲酸分解反应中,研究其催化制氢性能。通过X-射线衍射(XRD)、透射电子显微镜(TEM)、X-射线光电子能谱(XPS)等方法对催化剂的结构进行了表征。结果表明,催化剂呈片状结构,Au、Pd纳米粒子形成了AuPd合金,并均匀地分散在氮化碳载体上,粒径大小约为2.4nm。在348K,FA∶SF=1∶5的反应条件下,Au0.25Pd0.75/CN表现了最佳的催化性能,初始转化频率达397h^-1。AuPd纳米粒子与氮化碳载体之间的相互作用,AuPd的比例、载体的性质和高分散的AuPd纳米粒子有助于提高催化剂的催化性能。

AuPd alloy nanoparticles with different ratios supported on the graphitic carbon nitride have been prepared by a simple liquid reduction method and then used as an efficient formic acid(FA)decomposition catalyst for hydrogen generation.The structure of the catalyst was characterized by X-ray diffraction(XRD),transmission electron microscopy(TEM),X-ray photoelectron spectroscopy(XPS).The results showed that the supported AuPd nanocatalyst has a sheet-like structure,and the AuPd nanoparticles form an AuPd alloy and are uniformly dispersed on the carbon nitride with a particle size of 2.4 nm.The Au 0.25 Pd 0.75/CN catalyst exhibited excellent catalytic activity for hydrogen generation from formic acid with the initial TOF of 397 h^-1 at 348 K with FA∶SF=1∶5.The synergetic interaction between the bimetallic AuPd nanoparticles and the carbon nitride support,the AuPd ratios,the properties of support and the dispersion of AuPd nanoparticles on the support contribute to the high catalytic performance of the Au x Pd 1-x/CN catalysts.