碳纳米管负载Fe_2O_3催化剂的制备及其乙苯脱氢催化活性(英文)  

Preparation of carbon nanotube-supported Fe_2O_3 catalysts and their catalytic activities for ethylbenzene dehydrogenation

作　　者：彭峰[1] 傅小波[1] 余皓[1] 王红娟[1] 

机构地区：[1]华南理工大学化学工程系,广东广州510640

出　　处：《新型炭材料》2007年第3期213-217,共5页New Carbon Materials

基　　金：广东省自然科学基金(031420);广东省科技攻关项目(2003C33505)~~

摘　　要：采用FeSO4-H2O2体系对碳纳米管氧化修饰的同时,氢氧化铁被吸附在碳纳米管管壁上,然后分别通过氢气、氮气、空气在723K下处理2h,制备了碳纳米管负载的γ-Fe2O3催化剂、γ-Fe2O3和α-Fe2O3复合催化剂和非晶态Fe2O3催化剂。采用XRD、TEM和TG-DSC表征了催化剂结构,采用连续流动乙苯气相脱氢生成苯乙烯反应对催化剂性能进行评价,结果表明:热处理条件对催化剂乙苯脱氢的催化性能影响明显,碳纳米管负载的晶态Fe2O3纳米催化剂对乙苯脱氢具有高的活性与选择性。Carbon nanotubes were modified by FeSO4-H202 and iron hydroxides were adsorbed on the walls of carbon nanotubes simultaneously. These precursors were treated at 723 K for 2 h under hydrogen, nitrogen and air atmosphere to prepare carbon nanotube-supported γ-Fe2O3 catalyst, a γ-Fe2O3 and α-Fe2O3 compound catalyst and amorphous Fe2O3 catalyst, respectively. The catalysts were characterized by X-ray diffraction, transmission electron microscopy and TG- DSC. The catalytic activity was estimated by the dehydrogenation of ethylbenzene to styrene in a fixed bed reactor with a continuous flow system at atmospheric pressure. Results show that the effect of thermal treatment conditions on the catalytic performance activity for the dehydrogenation of ethylbenzene is very sensitive. Novel carbon nanotube-supported crystalline Fe2O3 catalysts were found to have a high activity and sclectivity for ethylbenzene dehydrogenation.

关 键 词：FE2O3 碳纳米管 复合催化剂 脱氢催化 纳米材料 

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