The adsorption equilibrium of propan-1-ol (1PN) and propan-2-ol (IPA) vapor was measured at (293.15, 313.15, 348.15, 373.15, and 393.15) K using the gravimetric method. The multitemperature Toth, Sips, inhomogeneous DA, and hybrid Langmuir-Sips models were used to fit the experimental data. Results indicate that Sips and hybrid Langmuir Sips models provide the best correlation. The surface composition of Sorbonorit B4 (SB4) was evaluated from X-ray photoelectron, infrared, and Raman spectroscopy. It was demonstrated that the adsorbent is heterogeneous and contains various surface oxygen groups. Although both alcohols have the same molecular formula, the maximum adsorption capacity of SB4 for 1PN vapor is somewhat higher (ca. 6.13 mol.kg(-1)) than that of IPA (ca. 5.58 mol.kg(-1)). The value of the isosteric heat of adsorption for the former compound is also larger than that of the other over the whole loading range. SB4 exhibits a higher affinity for 1PN than for IPA vapor, which may be due to various availabilities of micropore volumes for both compounds caused by different molecular shapes and sizes.