Importance of the polarity on nanostructured silica materials to optimize the hydrolytic condensation with molecules related to CO adsorption.

The present work reports the changes for the mesoporous materials SBA-15 and KIT-6 associated with the structural, textural, and chemical properties when they are subjected to thermo-alkaline treatment. Despite the fact that the silica supports have not a strong affinity for CO adsorption, the adsorption enthalpy profiles (ΔH) reported that the substrates subjected to the thermo-alkaline treatment (S15H and K6H) have a greater energetic affinity towards CO capture if compared to the precursory solids (S15 and K6). The ΔH is - 26.

Effect of Calcination Temperature and Chemical Composition of PAN-Derived Carbon Microfibers on N, CO, and CH Adsorption.

This work investigates the interplay of carbonization temperature and the chemical composition of carbon microfibers (CMFs), and their impact on the equilibration time and adsorption of three molecules (N, CO, and CH). PAN derived CMFs were synthesized by electrospinning and calcined at three distinct temperatures (600, 700 and 800 °C), which led to samples with different textural and chemical properties assessed by FTIR, TGA/DTA, XRD, Raman, TEM, XPS, and N adsorption. We examine why samples calcined at low/moderate temperatures (600 and 700 °C) show an open hysteresis loop in nitrogen adsorption/desorption isotherms at -196.