Abstract
The magnetic field effects on gas-solid interactions were examined, using physical adsorption systems of methanol, t-butanol, benzene and O2 onto carbon black (NPC), activated carbon fiber (A10) and zeolite 5 A (Z5A). With some previous results on the magnetic-field-induced adsorption and desorption of H2O and NO, a possibility of the magnetic control of gas/solid adsorption equilibrium was discussed. When a homogeneous steady magnetic field was applied to such gas/solid adsorption systems under equilibrium, amount of adsorption changes, being referred to magnetoadsorption (MA) and magnetodesorption (MD). The dependence of MAD on magnetic field intensity was classified into four types, depending on the kind of solids and adsorptives: MD (I), MA (II), MD-to-MA transition (III), and MA-to-MD transition (IV). Benzene/NPC, O2/A10 and O2/Z5A systems were type II and a methanol/NPC system was type IV (which was first observed). To understand thermodynamically MAD, we must presume certain magnetic states in adsorbed phases different from its bulk phase, which should arise from interaction between an adsorptive and a solid and/or between adsorptives during the adsorption process. Thus, it is possible that adsorption equilibrium is controlled by an external magnetic field, designing magnetic interactions in the adsorption process.
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