The development of efficient carbon dioxide sequestration and utilization technologies is an indispensable aspect of a wide range of measures directed at reducing the negative effects of anthropogenic emissions on the environment. One route is its capture via physical adsorption and further conversion to methane in the Sabatier reaction. The sorption process can be carried out, among others, in fixed-bed adsorptive reactors, in which the packing is made up of adsorbent and catalyst particles. Proper structuring of such a hybrid bed can contribute to increasing the efficiency of both stages of the process. Of importance in this regard is, first of all, the proper management of heat transfer. This study examines the sorption step of the operation of an adsorptive reactor for CO2 sequestration and methanation using a one-dimensional non-isothermal model of a layered fixed bed. Numerical calculations for different configurations and different volume adsorbent to catalyst ratios were carried out to determine how the hybrid structure of the bed and the atypical thermal waves it induces affect the sorption process. The results obtained prove that proper tailoring of the bed can be an excellent tool to control the temperature profiles and thus the performance of the apparatus and possibly its optimization.

Forests may play important role in partial neutralization of CO2 emission. To maximize their potential it is unavoidable to divide them into forests that will be allowed to evolve toward natural state and forest predisposed for timber production, supplemented with forest plantations. Natural forests store almost twice more carbon in biomass and soil than managed forests, and carbon contained in wood from plantations and timber-producing forests will be frozen long time in wooden constructions. Gasification of wood debris instead of burning will allow for production of biocarbon that added to soil will residue there through decades, and will decrease necessary amount of artificial fertilizers, which production is an important source of carbon dioxide. Forests evolving to natural state will be less prone to fire and hurricanes, and will better protect biodiversity. Presented project is not contradictory to the project “The Forest Carbon Farms” of State Forests, but allows to reach better results in shorter time and likely at lower cost.