Systematic Analysis of the Nitrogen Adsorption–Desorption Isotherms Recorded for a Series of Materials Based on Microporous–Mesoporous Amorphous Aluminosilicates Using Classical Methods

• DOI: 10.1021/acs.jced.3c00257
• Publication Date: 2023-09-01T14:11:01Z
• Authors: Víctor G. Baldovi...; Viviana Niño-Celis; Rafael Isaacs Gir...
• Keywords: Specific surface area; Physisorption

Amorphous aluminosilicates are applied in adsorption and catalysis because they can be designed to possess micro-, meso-, macropores. In this work, we analyze the nitrogen physisorption isotherms recorded for a series of materials based on amorphous synthesized by sol–gel via hydrolysis acidic medium (ACSG), with poly(ethylene glycol) template (P), gel skeletal reinforcement (GRS). We found that porosity ACGS GRS types was dominated mesopores, while P-type micropores but non-negligible fraction mesopores. catalogued produced latter type as IV(c) supplement current IUPAC classification. addition, hysteresis loops shown ACGS-type present inflection points not classes; therefore, propose classifying them H3(b) types. also assessed surface area classical methods, namely, Brunauer–Emmett–Teller (BET) area, t-plot microporosity, Barrett–Joyner–Halenda (BJH) mesopore size distribution, fractal dimension. First, semiexponential correlation between CBET constant their relative microporous area. Second, under conditions used herein, impregnation NiMo phase over increased reduced dimension materials. These changes were thus correlated observed microporosity mesoporous distributions