FORMATION OF NICKEL CONCENTRATION PROFILE IN NICKEL/ALUMINA CATALYST DURING POST-IMPREGNATION DRYING

JOURNAL OF CHEMICAL ENGINEERING OF JAPAN

ATSUSHI IKARI¹  YOSHIMITSU UEMURA¹  YASUO HATATE¹ 

[1] Department of Chemical Engineering, Kagoshima University

关键词: Mass Transfer;    Nickel Concentration Profile;    Nickel Alumina Catalyst;    Impregnation;    Electron Probe Microanalysis;    Solute Migration Model;   

DOI  :  10.1252/jcej.20.117

来源: Maruzen Company Ltd

【 摘 要 】

References(16)Cited-By(8)Nickel concentration profiles were studied for impregnated nickel/alumina catalysts prepared by impregnating two types of spherical aluminas with nickel (II) chloride aqueous solution and applying a wide range of postimpregnation drying conditions. Migration of nickel (II) ion towards the outer surface of alumina occurred during post-impregnation drying. The fraction of migrated nickel (II) ion increased with increase of the constant drying rate, and was held at a constant value, 0.5, at values of the constant drying rate larger than 2 × 10-4kg•m--2•-1. A model of solute migration during post-impregnation drying, combining solution movement by a capillary force with solute diffusion, was proposed. The observed nickel concentration profiles of the nickel/alumina catalysts showed good agreement with the results calculated by the model over the whole range of drying conditions.

【 授权许可】

Unknown