耐高温多孔Au@NiO的制备与实验研究

Preparation and research on porous heat resistant Au@NiO

为了防止负载型催化剂在实际应用中发生金纳米颗粒高温团聚现象,制备了一种耐高温多孔Au@NiO,并探索了最佳实验条件。利用SEM、BET、XRD等手段对其进行表面结构的表征分析,结果发现其孔径分布(23~75 nm)正好位于有效金纳米颗粒催化粒径范围(0~100 nm)。随后,将金纳米颗粒负载在其表面,结果发现这类多孔氧化镍结构有效隔断了高温下金纳米颗粒的团聚,表现出了较好的耐热性,抑制了该环境下金纳米颗粒高温团聚现象。

In order to prevent gold nanoparticles in supported catalysts from agglomerating under high temperature in practical application,a kind of porous Au @NiO resistant to high temperature is prepared while the optimal experimental conditions are explored.The surface structure of samples is characterized and analyzed through SEM,BET and XRD.It is found that the pore diameter is distributed in the range of 23-75 nm,which is just located in the effective size range（ 0-100 nm） of gold nanoparticles.Then the gold nanoparticles are supported on the surface of this porous Au@NiO.The results show that this supported nano gold carried by porous structure has excellent anti-aggregation behavior and shows better heat resistance. As a result,a new method of preventing agglomerating of gold nanoparticles at high temperature is achieved.