流化床中甲烷催化裂解制备碳纳米管和氢气  

PREPARATION OF HYDROGEN AND CARBON NANOTUBES via METHANE DECOMPOSITION IN FLUIDIZED-BED REACTOR

作　　者：刘唐[1] 骞伟中[1] 汪展文[1] 魏飞[1] 金涌[1] 李俊诚[1] 李永丹[2] 

机构地区：[1]清华大学化学工程系,北京100084 [2]天津大学化学工程系,天津300072

出　　处：《化工学报》2003年第11期1614-1618,共5页CIESC Journal

基　　金：国家自然科学基金 (No 2 0 0 0 60 0 9);清华大学实验室开放基金资助项目~~

摘　　要：利用高活性的纳米Ni/Cu/Al2 O3 催化剂 ,在流化床反应器中研究了CH4裂解制备碳纳米管与H2 的过程 .CH4的转化率受流化床中的操作条件 (温度、空速、气速及升温速率等 )影响 ,碳纳米管的形貌也受过程的升温速率影响 .在低升温速率下 ,能够同时得到较高的CH4转化率与形貌较好的碳纳米管 .而且采用低的升温速率 ,可以在流化床 (提供碳纳米管生长的自由空间 )中连续生长碳纳米管 。Preparation of carbon nanotubes and hydrogen from methane decomposition over a nano-sized Ni/Cu/Al2O3 catalyst was investigated in the temperature range of 823-1143 K in a fluidized bed reactor, which can provide sufficient space for carbon nanotubes growth. It was observed that the conversion of methane directly depended on operation conditions, including temperature, space velocity, gas velocity and the heat-up rate etc. Also the morphology of nanotubes was influenced significantly by the heat-up mode. Adopting a lower heat-up rate (50 K&middoth-1), relatively high conversion of methane and carbon nanotubes with pretty good morphology can be simultaneously achieved as compared to the results by adopting a higher heat-up rate (600 K&middoth-1). Furthermore, by using a low heat-up rate from 823 K to 1123 K, continuous production of the carbon nanotubes was achieved at 1123 K and the yield of carbon nanotubes was up to 10 g&middot(g cat)-1&middoth-1, which provided the basis for the large scale and continuous production of carbon nanotubes.

关 键 词：碳纳米管 氢气 流化床反应器 甲烷催化裂解 

分 类 号：TQ032.41[化学工程]