A TPD-MS study of the adsorption of ethanol/cyclohexane mixture on activated carbons

Abstract

The adsorption of ethanol/cyclohexane binary mixtures on different types of activated carbons was studied in this work by temperature programmed desorption coupled with mass spectroscopy (TPD-MS). The texture, morphology and surface chemistry of the carbons were evaluated by N 2 adsorption, scanning electron microscopy (SEM) and TPD-MS techniques. The ethanol and cyclohexane TPD-MS desorption profiles showed that specific interactions between the carbon material and the adsorbate are involved during the adsorption. Most of the activated carbons adsorb strongly ethanol on the surface, leading to desorption temperatures above 100°C. Only one carbon exhibits an affinity for cyclohexane. These observations were correlated to the different surface chemistry of the materials.

Insights on the reactivity of ordered porous carbons exposed to different fluorinating agents and conditions

“…For ZTC, an intense and large CO peak profile is observed at high desorption temperatures (300-900), suggesting the existence of mainly basic or neutral oxygenated functional groups such as phenols, ethers, and quinones [45,48,49]. However, the less pronounced desorption at temperatures between 300 and 500°C is an indication of acidic groups such as anhydrides.…”

“…STC shows a similar CO desorption profile to ZTC, but the peak intensity is much lower and less defined, while for CPC only groups at a very high temperature (800°C) are seen. For all carbonaceous materials, the CO 2 desorption peak is large and appeared between 200 and 700°C, which is specific to acidic groups such as carboxyl and anhydrides [45,[48][49][50]. In addition, a sharp CO 2 peak around 100°C is observed only for CPC.…”

Biomass char gasification by H2O, CO2 and their mixture: Evolution of chemical, textural and structural properties of the chars

“…This low CO 2 /CO ratio is often observed e.g. for activated carbons [52]. The emission of water during the TPD-MS experiments is low.…”

Thermogravimetric study on the influence of structural, textural and chemical properties of biomass chars on CO2 gasification reactivity

“…The mesopore volume (Vmeso) was obtained by subtracting the micropore volume from the total pore volume of N 2 adsorbed at a relative pressure of 0.95. The pore size distribution was determined using the DFT model on carbon slit pores [25].…”