The fabrication of porous 4A-zeolite-supported Ag nanoparticles catalysts and its catalytic activity for styrene epoxidation

摘要

Graphical abstract Binderless hierarchically porous 4A-zeolite have been successful produced through hydrothermal crystallization with silicon-aluminum sol binding to the carbon nanofibers (CNFs), where the CNFs powder was coated during the crystallization 4A-zeolite. The carbon nanofibers was obtained through electrospinning technology and high-temperature calcination process. The P-4A-zeolite was successful produced used hydrothermal method and high temperature calcination. P-4A-zeolite had good adsorption performance. The Ag/P-4A-zeolite was successfully prepared used carbon dioxide supercritical fluid technology and it has very good catalytic properties in the styrene epoxidation reaction. Display Omitted Highlights ? Binderless hierarchically porous 4A-zeolite been produced. ? The P-4A-zeolite exhibited excellent adsorption performance for silver nanoparticles. ? Ag/P-4A-zeolite has a very good catalytic activity for the epoxidation of styrene. Abstract Binderless hierarchically porous 4A-zeolite has been successful produced through hydrothermal crystallization, in which silicon-aluminum sol binded to the carbon nanofibers (CNFs), that is to say, where the CNFs powder was coated during the crystallization 4A-zeolite. The mixing of silica-alumina sol and CNFs was only a simple physical mixing process. The samples of micropores-macroporous hierarchical 4A-zeolite (P-4A-zeolite) was analyzed by a series of characterization techniques, such as field emission scanning electron microscope (FESEM), transmission electron microscopy (TEM), simultaneous thermal analysis (STA) and CO 2 adsorption-desorption (BET and BJH), and so on. In addition, the adsorption test of silver nanoparticles was carried out. The characterization results indicated the presence of micropores and the formation of macroporous. At the same time, silver adsorption test proved that the prepared P-4A-zeolite had good adsorption performance and the catalytic performance of Ag/P-4A-zeolite was further investigated through the epoxidation of styrene.