Low temperature ortho-para hydrogen conversion-kinetic studies

✍ Scribed by Noriaki Wakao; P. W. Selwood; J. M. Smith

• Publisher: American Institute of Chemical Engineers
• Year: 1962
• Tongue: English
• Weight: 490 KB
• Volume: 8
• Category: Article
• ISSN: 0001-1541
• DOI: 10.1002/aic.690080411

✦ Synopsis

Abstract

Rate studies were carried out for the ortho‐para hydrogen conversion at liquid nitrogen temperature with a multiple‐impregnation nickel on aluminum oxide catalyst. Data were obtained at pressures up to 400 lb./sq. in. gauge over a range of flow rates for three catalysts of different pellet sizes.

For the largest particle, ⅛‐in. cylinders, diffusion resistances were significant. Effectiveness factors were evaluated and found to be somewhat less that 0.5 for this relatively active catalyst. After the diffusion resistances were accounted for, the surface rate was correlated on the basis of a mechanism supposing molecular hyddrogen to be adsorbed on the surface. Separate evaluation of the catalyst for the hydrogen‐deuterium exchange reaction suggested that dissociation was not significant at liquid nitrogen temperature.