Hi Everyone,
I hope everyone is fine, I am currently doing pyrolysis of my sample for converting it into carbon, using tube furnace under argon atmosphere. There is no vacuum pump setup in my equipment to remove oxygen and other gases before argon gas purging. is it possible to create inert atmosphere using argon gas with out creating any vacuum inside the tube? because when I did my characterization i found oxide species in my converted sample and also at higher temperatures the carbon content is very less (heavy loss in my powder sample)
is there any strategies like controlling the flow rate _ L/min or other factors to attain Inert atmosphere.
I am eagerly waiting for you valuable response.
Thankyou
To create an inert argon atmosphere without vacuum, start with a high argon flow rate (5–10 L/min) to purge oxygen thoroughly, then maintain a steady moderate flow (1–3 L/min) during pyrolysis to keep positive pressure and prevent air ingress. Proper sealing and sufficient purge time are essential to minimize oxidation and carbon loss.
Dear Abdelhak Maghchiche,
Thankyou for your valuable answer, I will try that can you please suggest me simple and best way to determine the flowrate (eg. 5-10 L/min).
how to know that the gas covering the whole volume of tube or simply flowing without filling whole tube while flowing from inlet to outlet.
Dear T.Shanmuka Rao
If you follow the advice of Abdelhak Maghchiche and you still find oxide species, you may want to figure out whether anything in your pyrolysis process itself can generate oxide species (for example, N-O, S-O, or even some C-O species).
Dear Emanuel Cooper,
Thankyou for your response, yes my sample does contain Carboxyl groups in it. but i think when i heat it the C-O, C=O may break and replace with argon under flow. if you like to add some comment on this please guide me if i am wrong.
Dear Yousuf Jamal,
Thankyou for your suggestion. if will re-verify it.
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