The nitrogen adsorption isotherms at 77K for pristine and amine-impregnated X zeolite are shown in Fig. 1. All isotherms may be classified as Type I, in accordance with the IUPAC classifica- tion, with predominant microporous characteristics as evidenced by the high volume of nitrogen adsorbed within very low relative pressures. A second sharp increase in relative pressures close to 1.0 present in some isotherms is probably due to the presence of macropores as a result of pellet conformation and addition of binding agent.
For the other amine-impregnated zeolites loaded with differ- ent amine concentrations, nitrogen adsorption isotherms showed a progressive reduction in uptake as the concentration of the impreg- nating solution increases. The isotherm shapes indicate that ZX1.0 and ZX1.5 practically have no macropores, possibly because they were completely filled with amine. The samples impregnated with increasing amine concentration (up to 1.5% MEA) also showed a progressive decrease in the final uptake rise, which leads to the hypothesis that MEA fills not only micropores, but also larger pores to a certain extent.
The nitrogen adsorption isotherms at 77K for pristine and amine-impregnated X zeolite are shown in Fig. 1. All isotherms may be classified as Type I, in accordance with the IUPAC classifica- tion, with predominant microporous characteristics as evidenced by the high volume of nitrogen adsorbed within very low relative pressures. A second sharp increase in relative pressures close to 1.0 present in some isotherms is probably due to the presence of macropores as a result of pellet conformation and addition of binding agent.For the other amine-impregnated zeolites loaded with differ- ent amine concentrations, nitrogen adsorption isotherms showed a progressive reduction in uptake as the concentration of the impreg- nating solution increases. The isotherm shapes indicate that ZX1.0 and ZX1.5 practically have no macropores, possibly because they were completely filled with amine. The samples impregnated with increasing amine concentration (up to 1.5% MEA) also showed a progressive decrease in the final uptake rise, which leads to the hypothesis that MEA fills not only micropores, but also larger pores to a certain extent.
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