N2 gas adsorption/desorption isotherms for all of the used zeolites
are shown in Fig. 2. According to the Brunauer–Deming–Deming–
Teller (BDDT) classification [21,22], Type 1 isotherms are
characteristic of adsorbents containing mainly micropores, while
type IV isotherms typically have a hysteresis loop associated with
capillary condensation in mesopores. The isotherms of all the used
zeolites resembled type IV closely or faintly, suggesting the coexistence
of mesopores and micropores [23].
A vertical hysteresis loop of MS13X in the narrow range of P/
P0 = 0.80 to 0.99 indicates the presence of limited mesopore volumes
in MS13X, and suggests the presence of cylindrical type
pores [24,25]. The isotherm for HY901 showed a clear and wide
hysteresis loop at relative pressures of ca. 0.45, which is typical
N2 gas adsorption/desorption isotherms for all of the used zeolitesare shown in Fig. 2. According to the Brunauer–Deming–Deming–Teller (BDDT) classification [21,22], Type 1 isotherms arecharacteristic of adsorbents containing mainly micropores, whiletype IV isotherms typically have a hysteresis loop associated withcapillary condensation in mesopores. The isotherms of all the usedzeolites resembled type IV closely or faintly, suggesting the coexistenceof mesopores and micropores [23].A vertical hysteresis loop of MS13X in the narrow range of P/P0 = 0.80 to 0.99 indicates the presence of limited mesopore volumesin MS13X, and suggests the presence of cylindrical typepores [24,25]. The isotherm for HY901 showed a clear and widehysteresis loop at relative pressures of ca. 0.45, which is typical
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