Preparation of microporous sorbents from cedar nutshells and hydrolytic lignin

Reactivity and porosity development during pyrolysis and physical activation in CO2 or steam of kraft and hydrolytic lignins

“…Depending on the process of isolation various types of lignin can be differentiated [2] and, although these can all be utilised in their natural state for different adsorption processes [3], their adsorption capacity is generally low [4]. On the other hand, pyrolysis under appropriate conditions can be used to convert them into high surface area activated carbons with considerably improved performance and a number of studies dealing with physical and chemical activation of lignin [5][6][7][8][9][10][11][12][13][14][15] have already been published and reviewed. However, little work has so far been reported on comparing the reactivity of different lignin sources during pyrolysis and subsequent activation nor of the influence that this has on the properties of the resulting activated carbons.…”

“…Kraft and hydrolytic lignin samples were chosen as they are obtained by different processes from different raw materials and available data indicates that there are some significant differences in their molar mass distributions and precise chemical structures [37,38]. Furthermore, very little work has so far been carried out with hydrolytic lignin in comparison to kraft lignins [7]. The study was restricted to physical activation as we have particular interest in materials, namely carbon molecular sieves (CMS), with micropore sizes in the range of 0.4-0.8 nm and which are used for separations involving O 2 , N 2 , CO 2 and CH 4 , for example [39][40][41][42].…”

Research the Possibility of Using Lignin and Сellolignin to Obtain Granulated Active Cаrbons

“…Исходный гидролизный лигнин характеризуется достаточно раз-витой пористой структурой и может быть экономически выгодным сырьем для получения активных углей, используемых для процессов очистки промышленных газообразных и жидких выбросов от различ-ных видов примесей, в частности от органических веществ [2][3][4][5][6][7][8].…”

Preparation of Different Carbon Materials by Thermochemical Conversion of Lignin

“…More recently, Baklanova et al (2003) analyzed the influence of the carbonization temperature with hydrolytic lignin. They optimized the experimental conditions to prepare microporous ACs, and they observed that carbonization temperatures of 600-700°C could be used for producing microporous char materials with a minimum average size of micropores.…”