Biochar characterization using gas adsorption

Characterizing the structural properties of biochar, (e.g., pore size, surface area, and, especially, the tortuous network of small pores), can be difficult using traditional adsorptives such as nitrogen (77 K). This report shows the limitations of nitrogen and illustrates the suitability of carbon dioxide (273 K) adsorption for accurate characterization.

It is crucial to understand the structural properties of biochars, such as surface area, pore size, and pore volume, to understand their effectiveness in applications such as carbon sequestration. Typically, biochars contain tortuous networks of small micropores, which makes their characterization via nitrogen (77 K) difficult. Alternatively, carbon dioxide (273 K), which can readily access the porous network, is recommended for the characterization. The limitations of nitrogen and characterization with carbon dioxide will be demonstrated in this report. All experiments were performed using an Anton Paar Nova Series instrument, although the concepts and analyses are also relevant for biochar characterization on the Autosorb Series.

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