Influence of the pyrolysis temperature on activated carbon properties and CO₂ adsorption

International Conference and Exhibition on Materials Chemistry

March 31-April 01, 2016 Valencia, Spain

Jacek Mlodzik, U Narkiewicz, A W Morawski, R J Wrobel and B Michalkiewicz

West Pomeranian University of Technology, Poland

Posters & Accepted Abstracts: J Material Sci Eng

Abstract :

Activated Carbons (ACs) are one of the most promising sorbets. Their properties are widely depending on source material. It allows obtaining ACs with high surface area and well developed porous structure. The pyrolysis temperature influence on specific surface area, micropore volume and CO2 adsorption was investigated in this study. The ACs was obtained by technology patented by our team. Liquid molasses was mixed with dry KOH in dry mass ratio 1:1. The mixture was dried at 200oC and then it was grounded, pyrolyzed (at 650-850 oC, 1 hour, nitrogen atmosphere) and grounded again. Obtained powder was washed with deionized water, soaked in HCl (5 mol/dm3) and washed again, till filtrate was neutral. Adsorption and desorption of nitrogen at -196oC was provided with Quantochrome apparatus, so as CO₂ adsorption at 25oC. Specific surface area was calculated using BET equation (SBET), micropore volume was calculated using DFT method. The highest SBET was obtained in AC pyrolyzed at 800oC (2480 m2/g). Micropore volume percentage in total pore volume was calculated. The highest value (72.5%) was obtained in the case of AC pyrolyzed at 700oC. Micropore volume of AC pyrolyzed at 700oC was 0.609 cm3/g. CO₂ adsorption value ranged 1.62-3.39 mmol/g. Those properties confirmed that molasses based ACs are potentially very promising sorbents of CO₂.

Biography :

Email: jacek.mlodzik@zut.edu.pl