Micropore Structure and Intrapore Diffusion of Oxygen and Nitrogen in a Molecular Sieving Carbon

JOURNAL OF CHEMICAL ENGINEERING OF JAPAN

Takeshi Kato¹  Katsunori Suzuki¹  Yoshio Nakano¹ 

[1] Department of Chemical Engineering, Faculty of Engineering, Shizuoka University

关键词: Molecular Sieving Carbon;    Coconut Char;    Hydrocarbon;    Diffusivity;    Adsorption;    Kinetics;    Adsorption Separation;    Nitrogen;    Oxygen;   

DOI  :  10.1252/jcej.24.476

来源: Maruzen Company Ltd

【 摘 要 】

References(12)Cited-By(2)Both micropore size and volume in molecular sieving carbon (MSC) were controlled by heat treating of a hydrocarbon-impregnated MSC precursor, consisting of coconut-husk charcoal having various pore size distributions, in nitrogen at 1023, 1123 and 1223 K after heating at 10 K/min. The hydrocarbon mixtures used were guaiacol-naphthalene, diphenyl-naphthalene, fluorene-naphthalene and coal tar. The micropore size in the heat-treated MSC could be controlled to 0.28–0.4 nm through the proper combination of hydrocarbons, their concentrations and heat-treatment conditions, to give a high selectivity of separation of oxygen and nitrogen. The separation performance of the heat-treated MSC was evaluated in terms of the micropore volume W0* with pore size of 0.28–0.4 nm and the diffusivity ratio of oxygen and nitrogen DO2/DN2 to obtain the following correlation:DO2/DN2 = 29(W0*/WT)5.7It was found that the selectivity, DO2/DN2 increases with increasing micropore volume W0* (pore size: 0.28–0.4 nm) for the limiting volume of adsorption space with pore size larger than 0.28 nm, WT.

【 授权许可】

Unknown