Study Of Supporting New Porous Carbon Materials Catalyst For Selective Phenylacetylene Hydrogenation

Selective hydrogenation is an effective method to the removal of trace acetylene during the extraction of pyrolysis gasoline olefins.It is of great industrial significance to develop new hydrogenation catalyst with high conversion rate and high selectivity.Supported Pd-based catalysts are the most widely used catalysts in selective hydrogenation processes.However,Pd-based catalysts suffer from fast deactivation and reduced selectivity because of the generation and accumulation of carbonaceous deposits on Pd and its support surfaces due to its strong activity and adsorption capability for hydrogen.This paper studies mainly in the following respects:(1)In this paper,a feasible,simplified and productive synthesis procedure to produce 3D porous carbon frameworks(PCFs)with porous structure and morphology by one-step Na OH-assisted treatment of acetone is proposed in this research.(2)P-doped porous carbon frameworks(P-PCFs)were further prepared to modify its electronic structures and/or surface or subsurface structures of the loaded metal nanoparticles,thereby altering their catalytic activities.(3)Continuous flow hydrogenation reactor(Thales-Nano H-Cube ProTM)was used as the operation platform in this study;operating factors which affect the phenylacetylene conversion,styrene selectivity and the yield of styrene were optimized by orthogonal experiments in the reaction of phenylacetylene selective hydrogenation.The catalysts were characterized by X-ray photoelectron spectroscopy(XPS),X-ray diffraction(XRD),temperature programmed reduction(TPR),scanning electron microscope(SEM)and transmission electron microscope(TEM)to study the catalyst morphology change and dynamic change in the process of hydrogenation reaction.In the project,based on the comprehensive understanding of different factors that affect the selective hydrogenation,we characterized the change of the electronic state and the adsorption capacity before and after the catalytic reaction and try to associate the dynamic changes with the catalytic performance of catalysts which further promote the deep research in improving catalyst selectivity and stability.