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Reaction-diffusion model for irregularly shaped ammonia synthesis catalyst and its verification under high pressure / Tao Li in Industrial & engineering chemistry research, Vol. 48 N° 19 (Octobre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 19 (Octobre 2009) . - pp. 8926–8933 Titre : Reaction-diffusion model for irregularly shaped ammonia synthesis catalyst and its verification under high pressure Type de document : texte imprimé Auteurs : Tao Li, Auteur ; Mao-sheng Xu, Auteur ; Bing-chen Zhu, Auteur Année de publication : 2009 Article en page(s) : pp. 8926–8933 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Reaction−diffusion  model  Irregularly  shaped  ammonia  synthesis  catalyst  Intrinsic  kinetics  equation Résumé : A one-dimensional isothermal multicomponent reaction−diffusion model was established for irregularly shaped ammonia synthesis catalyst A301. The intrinsic kinetics equation was derived from the experimental data obtained under high pressure ranging from 7.5 to 10.5 MPa. A feasible method was developed to measure the shape factor of the irregularly shaped ammonia synthesis catalyst. The dynamics single pellet string reactor method as well as parameter estimation was applied to get the tortuosity factor of irregularly shaped ammonia synthesis catalyst. The orthogonal collocation method combined with the Broyden method was employed to solve the model equations, and the internal-diffusion efficiency factor and the concentration distributions of individual components in the catalyst were obtained. The multicomponent reaction−diffusion model was verified by the global kinetics data obtained in a gradientless reactor. The calculation data agreed well with experimental data, so the model can be used to describe the processes of multicomponent reaction and diffusion in the irregularly shaped catalyst. The integrative methodology of catalyst engineering presented in this paper can be extended to guide catalyst preparation and reactor design. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9001266 [article] Reaction-diffusion model for irregularly shaped ammonia synthesis catalyst and its verification under high pressure [texte imprimé] / Tao Li, Auteur ; Mao-sheng Xu, Auteur ; Bing-chen Zhu, Auteur . - 2009 . - pp. 8926–8933. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 19 (Octobre 2009) . - pp. 8926–8933 Mots-clés : Reaction−diffusion  model  Irregularly  shaped  ammonia  synthesis  catalyst  Intrinsic  kinetics  equation Résumé : A one-dimensional isothermal multicomponent reaction−diffusion model was established for irregularly shaped ammonia synthesis catalyst A301. The intrinsic kinetics equation was derived from the experimental data obtained under high pressure ranging from 7.5 to 10.5 MPa. A feasible method was developed to measure the shape factor of the irregularly shaped ammonia synthesis catalyst. The dynamics single pellet string reactor method as well as parameter estimation was applied to get the tortuosity factor of irregularly shaped ammonia synthesis catalyst. The orthogonal collocation method combined with the Broyden method was employed to solve the model equations, and the internal-diffusion efficiency factor and the concentration distributions of individual components in the catalyst were obtained. The multicomponent reaction−diffusion model was verified by the global kinetics data obtained in a gradientless reactor. The calculation data agreed well with experimental data, so the model can be used to describe the processes of multicomponent reaction and diffusion in the irregularly shaped catalyst. The integrative methodology of catalyst engineering presented in this paper can be extended to guide catalyst preparation and reactor design. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9001266