Preparation And Catalytic Properties Of Porous Nanoalloys

Porous nanometal materials have been widely used in catalysis,electrochemistry,spectrometry,and surface modification etc.The synthesis and control of nanostructure metals of various structure and morphology resulting in fascinating functions and enhanced properties has been the subject of scientists'great attention.On one hand,porous structure plays a key role in determining reactant diffusion,adsorption,and enrichment,which greatly affects the catalytic efficiencies.However,design of metal catalysts with controlled porous structure is still very difficult.On the other hand,single metal catalyst has some drawbacks that cannot be ignored,so many studies have focused on the research of alloy catalysts.Metal alloys mainly consist of traditional metallic composites and amorphous alloys.Metals with mesoporous morphology have unique advantages in many fields,but there are relatively few reports on the preparation and application of ordered mesoporous metal alloys.Although supported amorphous alloy catalysts have attracted widespread attention due to their high intrinsic activity,good selectivity and strong poisoning resistance.However,the Metal-P amorphous alloys prepared by traditional loading method usually have large particles,are easy to agglomerate and sinter,and the active components are unstable,which limits the application of amorphous alloy catalysts.This paper will focus on the above issues to carry out the following work:?1?Microwave-assisted preparation of Ni-P/CNTsCarbon materials have a strong absorption effect on microwave.When heated by microwave,super-hot spots will appear on carbon.Using this characteristic,we prepared amorphous Ni-P catalyst supported on carbon nanotubes.Under microwave irradiation,the reduction of Ni²⁺and the combination of Ni-P and CNTs can be realized in one step.Compared with the traditional chemical deposition method,microwave heating can achieve more efficient and rapid preparation,and the interaction between Ni-P and CNTs is strengthened.In the test of catalytic hydrogenation reaction,the catalyst obtained higher activity and stability than the catalyst prepared by traditional method.?2?Fabrication of ordered mesoporous PtCu alloys by soft template methodPt-based metal catalysts have been applied in various fields,such as electrocatalysis,thermal catalysis,photocatalysis and so on.In order to utilize the active sites of Pt efficiently,it is a very effective method to prepare metal into mesoporous structure.However,the disadvantage of Pt-based catalyst poisoning cannot be ignored.The common method is to dope the second metal with Pt.We choose metal Cu as auxiliary metal to fine-tune the electronic morphology and surface properties of Pt,and prepare ordered mesoporous structure to maximize the utilization of the active sites.In the MOR test,the activity of PtCu alloy were increased more than five times compared with the commercial platinum black catalyst.We attribute it to the synergistic effect of bimetals and the advantages of ordered mesoporous structure.