I have taken BET for my carbon material the value is very low compared with other literatures I got only 33 m2/g surface for 850 degree pyrolysis sample, also I have chemically activated with KMnO4 before physical activation and after chemical and physical activation I have removed metals and other impurities with HCL... why am I getting very low surface area but I got co2 adsorption capcity 37 mg/g.
What is your starting material - you failed to mention what it is. What is the particle size, moisture and ash content of the starting material? What temperature did you pyrolyse at and for how long and in what sort of reactor? You have not provided enough information for an assessment or sensible response to be made, nor how you've measured the BET.
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