氮化碳负载CePd催化剂的甲酸分解制氢性能

Carbon nitride supported CePd nanocatalyst for hydrogen productionfrom formic acid decomposition

以不同形貌的氮化碳为载体,采用液相还原法制备了Ce改性的负载型Pd催化剂,并利用X-射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X-射线光电子能谱(XPS)和ICP-OES元素定量分析对催化剂的结构进行了表征,对其甲酸分解制氢的催化性能进行了测试。结果表明,CePd/CNS催化剂具有球形中空网状结构,CePd纳米粒子均匀的分散在CNS载体上,粒径约为2.7±0.5 nm。在348 K,甲酸与甲酸钠添加摩尔比为1:8时,表现出良好的催化活性,TOF高达2746.1 h^(-1)。球形中空网状的氮化碳结构,有利于金属纳米粒子的分散,促进了活性组分与载体CNS之间的电子转移,增强了它们之间的相互作用,从而增强了CePd/CNS催化剂的甲酸分解制氢性能。

Supported Pd catalyst modified by Ce was prepared by liquid phase reduction method with different morphology carbon nitride as support.The structure of the catalyst was characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),X-ray photoelectron spectroscopy(XPS)and ICP-OES quantitative analysis,and the catalytic performance of the catalyst for hydrogen production from formic acid decomposition was tested.The results showed that the CePd/CNS catalyst had a spherical hollow net structure,and the CePd nanoparticles were uniformly dispersed on the CNS support with a particle size of 2.7±0.5 nm.When the ratio of formic acid to sodium formate was 1:8 at 348 K,the CePd/CNS showed good catalytic activity,and the TOF was up to 2746.1 h^(-1).The spherical hollow net structure of carbon nitride facilitated the dispersion of metal nanoparticles,promoted the electron transfer between the active component and the CNS support,and enhanced the interaction between them,thus enhancing the performance of the CePd/CNS catalyst for hydrogen production from formic acid decomposition.