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CO2 adsorbent pellets produced from pine sawdust: Effect of coal tar pitch addition

AuthorsGonzález Plaza, Marta ; Durán Vera, Inés ; Rubiera González, Fernando ; Pevida García, Covadonga
CO2 capture
Issue DateFeb-2015
CitationApplied Energy 144: 182-192 (2015)
AbstractThe 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 CO2. 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% CO2 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.
Publisher version (URL)http://dx.doi.org/10.1016/j.apenergy.2014.12.090
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