Low-Density Organic Aerogels from Oil Shale By-Product 5-Methylresorcinol

A.-L. Peikolainen ； F. Pérez-Caballero ； M. Koel

《Oil Shale》 25卷3期 (2008/09) Pp. 348-358

並列摘要

The objective of the present work was to prepare organic aerogels using a by-product of oil shale processing as a starting material. Low-density organic aerogels were synthesized via sol-gel polycondensation of formaldehyde (FA) and either 96% 5-methylresorcinol (MR) or the technical mixture named Honeyol(superscript TM) (H) containing 59.6% of 5-methylresorcinol among other diphenolic compounds, using supercritical CO2 for drying the gel obtained. Porosity and particle characteristics of MR-FA and H-FA aerogels can easily be controlled by varying the concentrations of precursors and preparation conditions. Less than 4.5-hour drying resulted in MR-FA aerogel characterized by radial shrinkage 2%, density 0.21 g/cm^3 and specific surface area 350 m^2/g. At the same molar ratios H-FA aerogel had 29% shrinkage, 302 m^2/g specific surface area and the density as low as 0.10 g/cm^3.
The preparation techniques and morphology of MR-FA and H-FA aerogels were compared to resorcinol-formaldehyde, phloroglucinol-formaldehyde and phenol-formaldehyde aerogels.