Physisorption of argon, nitrogen and oxygen by MCM-41, a model mesoporous adsorbent

Abstract

Adsorption isotherms of argon, nitrogen and oxygen have been determined at 77 K on a sample of MCM-41, a novel form of aluminosilicate. All the isotherms are Type IV in the IUPAC classification. The argon and oxygen isotherms exhibit well defined hysteresis loops, whereas the nitrogen isotherm is completely reversible. This unusual character is attributed to capillary condensation taking place within a narrow range of tubular pores of effective width 3.3–4.3 nm. MCM-41 shows considerable promise as a model mesoporous adsorbent

Characterization of micro- and mesoporous solids by physisorption methods and pore-size analysis

“…The mesoporous MCM-41 and the mesoporous SiO 2 materials show a continuous increase in adsorbed volume with p/p 0 from 10 À5 up to 10 À1 with no pressure transitions and no in¯ection point indicative of the complete absence of micropores and in perfect agreement with the Ref. [15]. There are two explanations for the absence of a distinct point of in¯ection at low p/p 0 .…”

Isopropylation of toluene: a comparative study of microporous zeolites and mesoporous MCM-41 materials

“…All the catalysts show a characteristic step around the P/P 0 ≈ 0.4 indicating the mesoporous nature of the materials [33]. The pore diameter and pore volume are found to decrease with increasing metal (Al, Zn and Fe) incorporation over all the catalysts similar to the previous report [34].…”

Pore Size Analysis of MCM-41 Type Adsorbents by Means of Nitrogen and Argon Adsorption

“…Nanoporous adsorbents of the MCM-41 type (7,8) are known to possess the most uniform hexagonal array of quasicylindrical pore channels as compared to other available porous materials and may serve as potential reference adsorbents (9). MCM-41 materials are currently under intense investigation with respect to their synthesis, modification, structure elucidation, and various potential applications as adsorbents, catalyst supports, and host systems for various purposes (10,11).…”