Preparation of Fe-Al Hollow Nano-spherical Catalyst and its Application in Catalytic Cracking of Ethane for Carbon Nanotube Production  

作　　者：Liu Bei Wang Taoxiang Li Kang Sun Hongman Wang Youhe Yan Zifeng 

机构地区：[1]State Key Laboratory for Heavy Oil Processing,China University of Petroleum,Qingdao 266580,China [2]Luoyang R&D Center of Technology of SINOPEC Engineering(Group)Co.Ltd.,Luoyang 471003,China

出　　处：《China Petroleum Processing & Petrochemical Technology》2024年第4期39-48,共10页中国炼油与石油化工(英文版)

摘　　要：Fe-Al catalysts with hollow nano-spherical structures were synthesized following the hard template method using self-made carbon spheres as templates.The catalytic performance of these catalysts in the production of carbon nanotubes(CNTs)was evaluated through ethane catalytic cracking on a fixed bed reactor.Furthermore,the influence of these hollow nanospheres on the yield and quality of CNTs was investigated.The results showed that compared to the irregular-shaped catalyst synthesized by coprecipitation and the catalyst with micro-spherical structures prepared by the impregnation method,the Fe-Al hollow nano-spherical catalysts exhibited significantly enhanced specific surface area and pore volume,reaching 236 m^(2)/g and 0.77 cm^(3)/g,respectively.At a reaction temperature of 700℃ and an ethane feed rate of 90 mL/min,the CNTs yield of Fe-Al hollow nano-spherical catalyst reached as high as 48.6 gCNT/gcat,which was 1.8 and 4.6 times higher than the yield of irregular-shaped(27.7 gCNT/gcat)and micro-spherical(10.5 gCNT/gcat)catalysts,respectively.This was mainly attributed to the hollow cavity structure of Fe-Al catalyst providing sufficient space for the CNTs growth.As a result,the blockage of catalyst internal pores was prevented by the formed CNTs,which isolated ethane molecules from the active sites and lead to catalyst deactivation.Furthermore,the CNTs synthesized by Fe-Al hollow nano-spherical catalyst exhibited a uniform diameter distribution and a higher degree of graphitization.

关 键 词：Fe-Al oxides carbon nanotubes hollow nanospheres ETHANE catalytic cracking 

分 类 号：TQ426[化学工程] TB383.1[一般工业技术—材料科学与工程]