STATISTICAL QUANTIFICATION AND CHARACTERIZATION OF MATERIAL PROPERTIES INFLUENCING THE REACTIVITY OF ACTIVATED CARBONS

摘要

Activated carbons (ACs) are nanoporous adsorbent widely used to remove organic compounds from air. Due to rather low oxidation temperatures, these materials are prone to ignition which causes safety problems in industrial practice. This study aims at identifying the physical and chemical properties of the carbon materials which control the process of oxidation and ignition. For that purpose, the point of initial oxidation (PIO) and self ignition temperature (SIT) were measured and compared for a wide variety of ACs, produced from diverse raw materials by physical or chemical activation. The set of temperature data was correlated to the physical properties and chemical composition of the materials by using a multiple linear regression approach to point out the most influent variables. These ones were shown to be connected to the organization of the graphitic structure, analysed from high resolution transmission electron microscopy (HRTEM), the presence of the functional oxygen groups on the carbon surface and the mineral content. The analysis enabled to explain the deviations observed between the different types of materials regarding their oxy-reactivity.