Home – Home – Jornals – Chemistry for Sustainable Development 2012 number 3

Effect of mechanical activation of the powder mixture 3Fe + Al on the structure of mechanocomposites and their evolution during self-propagating high-temperature synthesis was investigated. It was shown that substantial decrease of the temperatures of heat evolution start typical for thermal explosion and the critical temperature of thermal explosion of preliminarily activated mixtures is connected with the presence of regions with fine layered structure in agglomerates, while the heterophase character of synthesis products is due to relatively low maximal synthesis temperature. It was established that mechanical activation of the systems Fe–Al leads to a substantial increase in the catalytic activity of Fe₃Al intermetallide during methane conversion into synthesis gas, and also to an increase in the conversion degree of CH₄ and CO₂ to 93 and 91 %, respectively. In the case of the sample without mechanical activation, these parameters are only 15 and 53 % for CH₄ and CO₂, respectively.