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The macro-kinetics of benzene hydrogenation over porous Ni/γ-Al_2O_3 catalyst was measured with asingle-pellet diffusion reactor.Based on the dusty-gas model,the differential equations by taking into account ofthe variation of effective diffusivities with the composition were derived to describe the diffusion and reactionprocesses of reacting species over porous catalyst.Using the tortuosity factors determined under the condition ofsteady physical diffusion,the global reaction rates were calculated by solving the equations,and the results are ingood agreement with the experimental data obtained. 相似文献
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气体的温度和压力及颗粒形状对固定床压降的影响 总被引:3,自引:0,他引:3
本文在A-S方程的基础上推导出气体流经固定床时的压降表达式。 相似文献
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本文将弹性力学方法引入催化剂颗粒应力分布的计算。实验结果表明,催化剂材料的应力应变关系弹性材料的特征,催化剂材料的强度判据可采用最大剪应力准则;催人瓣力学性能数据中,弹性模量基本上为常数,泊松系数则明显地随应变变化,这种现象充分表明了多孔催化剂材料随外界压力的变化自动调节其内部率这一本质特征。在实验结果的基础上,本文给出了镍催化剂(以水泥作粘合剂)的力学性能数据,并对三种异形催化剂颗粒的侧向承载能 相似文献
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根据世界科技革命及我国现代化进程,对现代科学思维方式的本质特征及其历史必然性进行了探讨,阐述了当前改革陈旧、落后、僵化的思维方式,促进思维方式现代化的重要性和必要性 相似文献
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1 INTRODUCTIONWhen an exothermic reaction is carried out in a fixed bed reactor,there exists an axialtemperature profile exhibiting a maximum,known as the hot spot.In certain regions ofthe parametric sensitivity,the hot spot temperature undergoes very large increases forsmall changes in one or more inlet parameters,and this phenomenon is called runawayand the corresponding inlet condition is known as the critical.The reactor will be outof controlled beyond this condition and brings about a bad influence on process con- 相似文献