Abstract
In this study, four types of adsorbents for PSA process suitable for the purification of low-purity by-product hydrogen gas generated in the petrochemical NCC process were selected and their characteristics were reviewed by performing SEM-EDS, XRD, and BET analysis. SEM-EDS analysis showed that P1 was an organic C component, P2 was Si, Al, Ca, Na component, P3 was Si component, and P4 was Al component. In particular, in the case of P2, a Si/Al ratio of 1.2, a Na/Al ratio of 0.20, and a Ca/Al ratio of 0.32 were detected. For XRD analysis, P1 is amorphous and graphite, P2 is a mixture of zeolite 10X and 13X, P3 is amorphous silica gel, and P4 is a typical Al<sub>2</sub>O<sub>3</sub> crystal structure. BET synthesis analysis of adsorbents showed that P1 had the most well-developed micropores and P2, P3, and P4 had larger mesopore volumes.
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