Can someone tell me the appropriate temperature range for degassing modified Activated carbon powder before the BET analysis for specific surface area?
Usually about 300°C are sufficient for this treatment. However the most important thing to remember is that you do not exceed the decomposition temperature of a substance if you included in your surface modification.
When you made an BET analysis, you will graph in the abscissa [P/Po] and in the ordinate [Vads] Where:
P: Each one of the output pressures in the system, it means that, for example if you made the analysis using (N2) It will enter in the system whit a pressure A [Pa] and when it goes out of the system have a pressure B [Pb], where Pa>Pb. So, the pressure you will use to graph is Pb.
Po: Is the pressure of saturation, in the example, of the (N2), the pressure of saturation is at 77k or 350°C.
Vads: Is the adsorbed volume by the nitrogen.
You can made the analysis using (N2) or (CO2), and depending on what uses, you will have to implement a temperature.
Good Luck!
hello,
I belive that degassing tempertaure is a function of the solide material nature. some time it is neccassary to do an ATG test. I suggest that you read answers for previous questions.
https://www.researchgate.net/post/Can_anyone_explain_how_to_determine_degassing_temperature_for_the_preparation_of_a_material_for_BET_analysis
good luck
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