CO 2 adsorbent pellets produced from pine sawdust: Effect of coal tar pitch addition

Abstract

The main drawbacks of developing carbon adsorbents from pine sawdust, an abundant biomass feedstock, are the low carbon yield of the process and the poor mechanical properties of the resulting carbons. In an attempt to overcome these limitations, the effect of the addition of coal tar pitch was assessed. Adsorbent pellets were produced from pine sawdust and coal tar pitch by activation with CO 2 . The preparation process was optimized by using as decision variables the carbon yield and the adsorption performance of the adsorbents in conditions representative of post-combustion capture applications (10% CO 2 at atmospheric pressure and at 50 °C). Subjecting the composite pellets to a pre-oxidation treatment with air increased the carbon yield of the production process, and also improved the adsorption kinetics and capacity of the final adsorbents. The prepared adsorbents present a high carbon yield, a superior mechanical resistance and a competitive adsorption performance.

The preparation of activated carbon discs from tar pitch and coal powder for adsorption of CO 2 , CH 4 and N 2

“…As the temperature is increased further during foaming and carbonization reactions occur, the remaining pitch components begin to solidify and form solid carbon walls around the bubbles [6,40,41]. The pore macropore structures observed in the ACDs are consistent with structures of foams derived from pitch and other precursors that have been reported [20,25,34]. We propose that the coal filler particles have two main mechanistic roles during the low-…”

“…A wide range of precursors have been reported for carbon foam synthesis including coal [5][6][7] , coke [8,9] , pitch [6,[10][11][12][13][14][15] , polymer [16][17][18][19] and biomass [20][21][22][23] . Of these materials, bituminous tar pitch and coal tar pitch are some of the most commonly used carbon precursors because pitch is already used in more-conventional activated carbon production processes, low cost pitch is widely available from the petrochemicals industry, and pitch has a high carbon content [24].…”

Sustainable coffee‐based CO2 adsorbents: toward a greener production via hydrothermal carbonization

“…CO 2 capture capacities of the pellet‐shaped coffee‐based activated carbons were estimated in conditions representative of post‐combustion capture (50°C and low partial pressure of CO 2 ) by means of a thermogravimetric analyzer TGA/DSC1 STARe System from Mettler Toledo following the procedure described elsewhere . The CO 2 capture capacity experiments were performed as shown in Fig.…”

Separation of CO2 in a Solid Waste Management Incineration Facility Using Activated Carbon Derived from Pine Sawdust

“…The carbon adsorbent pellets were produced from pine sawdust alone (IH3) and from blends of pine sawdust and coal tar pitch (IH2). The preparation process is thoroughly described in a previous work [23]. Further characterization of the samples was carried out in order to assess the microporous structure of the activated carbons.…”