Non-destructive evaluation of an activated carbon using microwaves to determine residual life

作者：Mason A^*; Korostynska O; Wylie S; Al Shammaa A I

来源：Carbon, 2014, 67: 1-9.

DOI：10.1016/j.carbon.2012.06.034

This paper describes a novel technique for determining the residual life of activated carbon material through changes in response when placed inside a resonant cylindrical cavity excited at microwave frequencies. The technique has been validated through the co-ageing of two activated carbon batches at 40 degrees C and 80% relative humidity over a period of 7 months. Two regions in the microwave spectra, 7500 and 8595 MHz, have been identified to exhibit similar transmitted signal attenuation: 0.25 and 0.35 dBm/month, respectively. Breakthrough curve analysis using (CN)2, CNCl and HCN confirmed that the samples were indeed deteriorated over the experimental period. Since activated carbon derives its filtration properties from both porosity and impregnants contained in the structure, the results obtained here suggest that there is a strong correlation between the response of activated carbon at microwave frequencies and amount of time that the activated carbon is exposed to a humid atmosphere. As a result, it is possible to produce calibration curves which can be used to predict the residual life of the activated carbon material in real-time.

• 出版日期2014-2