摘要
催化剂的有效因子与操作温度和颗粒尺寸有很大关系,随反应温度的升高,催化剂的有效因子在减小。催化剂颗粒直径对有效因子的影响结果表明,当d_p<4.0mm时,有效因子随颗粒直径的减小而急剧增加,而当d_p介于4.0和10.0mm时,有效因子随颗粒直径的增大而减小的幅度明显降低。有效因子的计算值与实测值相近,用于反应器数学模型计算的床层温度分布和CO转化率与中间试验结果呈良好的一致性。
The Effectiveness factorsoftheprecipitated Fe/Cu/K catalyst used for the Fischer-Tropsch Synthesis decreased with temperature, as the rate constant k increases more strongly with temperature than the diffusivity, leading to a larger Thiele modulus.Particle size can have a dramatic effect on the effctiveness factor for the catalyst pellet.At smaller particle sizes(d_p<4.0mm), the effectiveness factor increased signficantly and approached its intrinsic value(1.0)with decreasing particle diameter. At larger particle sizes (d_p=4.0-10.0mm),the effectiveness factors diminished steady due to the diffusional resistance. Effectiveness factors based on the reaction diffusion model showed a good agrement with those obtained by kinetic investigation.It can be used for reactor simulation which led to perfect correlation of temperature and CO conversion with the results from pilot plant.
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
1996年第1期1-6,共6页
Journal of Fuel Chemistry and Technology
关键词
FT合成
铁
催化剂
有效因子
操作参数
Fischer-Tropsch synthesis,precipitated Fe/Cu/K catalyst,effectiveness factor,reaction diffusion model