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Experiment study on the correlation between the CO
 2
 adsorption capacity and electrical resistivity of coal with temperature effect

The main objective of this study is to investigate the relationship between the CO2 adsorption capacity and electrical resistivity of coal. The H‐Sorb 2600 high pressure gas adsorption analyzer is used to measure the CO2 sorption capacity in the temperature range of 25–55°C for anthracite coal. In addition, the TH2811D LCR meter is used to examine the electrical resistivity of raw coal samples and coal briquettes from 15°C to 65°C. The results indicate that there is a critical pressure threshold depending on the coal types and the pattern of changes in CO2 adsorption capacity changes when this threshold is exceeded. The electrical resistivity of raw coal samples decreases linearly and then slightly decreases at temperatures above 45°C and the electrical resistivity decreases approximately linearly from 15°C to 65°C for the coal briquettes due to lower compactness compared with the raw coal samples. The CO2 adsorption capacity has a power function with the electrical conductivity of the raw coal samples and coal briquettes. The power exponent of the power function is related to the porosity of coal. The results of the experiments indicate that it is effective to estimate the CO2 adsorption capacity of coal from the electrical conductivity. © 2019 Society of Chemical Industry and John Wiley & Sons, Ltd.