Abstract
Adsorption of nitrous oxide on resin char was investigated with a thermogravimetric system in this study. The char was prepared from pyrolysis of phenol-formaldehyde resins, followed by gasification of the resulting char in nitrous oxide to 18.5% burn-off. The temperature range used in the adsorption experiments was 35–80°C, and the partial pressure of nitrous oxide varied within 25–101 kPa. Experimental data showed that the adsorption isotherms were approximately linear in partial pressure of nitrous oxide. The adsorption was found to be reversible, based on the results of desorption experiments. Simulation of the adsorption kinetics with a modified Langmuir model has shown that the rate of adsorption had apparent orders of 4 and 5 with respect to the adsorptive sites and the nitrous oxide pressure, respectively. The rate constant of desorption was shown to increase with temperature, whereas that of the forward pathway of the reversible adsorption was less sensitive to temperature. According to the simulated results, the reversible adsorption was exothermic with an enthalpy change of −11.5 kcal/mol.
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