摘要
为获得超细粒子Fe-Mn工业催化剂在F-T合成中CO转化的动力学模型描述式,为其工业放大过程中反应器设计提供依据,将F-T合成这样一个包括数百个反应的体系集总为F-T烃生成反应和水煤气转换(WGS)反应.这样,反应物CO的转化速率可近似地用烃生成速率与CO2生成速率之和来表示.在碳化物机理基础上建立烃生成基元反应步骤,以决定烃“结构单元”CH2生成的步骤为速控步骤建立动力学模型.同时,在甲酸盐机理基础上建立CO2生成的基元反应步骤,以甲酸盐物种的生成步骤为速控步骤建立动力学模型.
The objective of this paper is to establish a kinetic model description of CO conversion over the ultrafine particle Fe-Mn commercial catalyst in the Fischer-Tropsch process to provide the design basis for scaling up commercial reactor.Fischer-Tropsch process, including hundreds of reactions, was lumped into two kinds of reactions.One was Fischer-Tropsch reaction, in which the main product hydrocarbons were formed.The other was Water Gas Shift (WGS)reaction, in which the main by-product CO_2 was formed. Thus, the reaction rate of CO was approximately expressed as the sum of hydrocarbon formation rate and CO_2 formation rate.The description of the elementary step in the hydrocarbon formation was established based on the carbide mechanism.The rate-controlling step in the hydrocarbon formation model was the one controlling the formation of the structure unit CH*__2. Meanwhile, the description of the elementary step in Water Gas Shift reaction was found based on the formate mechanism,and the rate-controlling step in Water Gas Shift reaction model was the formation of formate species.The kinetic model description of the Fischer-Tropsch process, including both Fischer-Tropsch reaction and Water Gas Shift reaction, was acquired by the combination of the above two kinds of kinetic models.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2005年第6期1020-1025,共6页
CIESC Journal
基金
山西省自然科学基金(20031032)
中科院知识创新重大项目(KGCX1SW02)
国家科技部"863"项目(2001AA523010).~~
关键词
F-T合成
FE-MN催化剂
集总机理动力学
烃生成
WGS反应
Fischer-Tropsch synthesis
Fe-Mn catalyst
lumped mechanism kinetics
hydrocarbon formation
Water Gas Shift reaction