An interesting question , please have a look at following:

Preparation of perlite-based carbon dioxide absorbent by H He 1, L Wu, J Zhu, B Yu (DOI: 10.1016/0039-9140(94)80119-3 )

Abstract :A new highly efficient carbon dioxide absorbent consisting of sodium hydroxide, expanded perlite and acid-base indicator was prepared. The absorption efficiency, absorption capacity, flow resistance and color indication for the absorbent were tested and compared with some commercial products. The absorbent can reduce the carbon dioxide content in gases to 3.3 ppb (v/v) and absorbs not less than 35% of its weight of carbon dioxide. Besides its large capacity and sharp color indication, the absorbent has an outstanding advantage of small flow resistance in comparison with other commercial carbon dioxide absorbents.

Please look at the following below links which may help you in your analysis:

https://patents.google.com/patent/CN1032044C/en

Thanks

Anoop Kumar Srivastava Isam Eldin Hussein Elgailani So is that meaning that the perlite contains KOH or NaOH will absorb carbon dioxide? But perlite without any KOH or NaOH will not absorb carbon dioxide?

Yes it can absorb if it mixed with sodium hydroxide and it can absorb upto 35% of its weight.

Kiprotich Kiptum thanks for your answer, so from what I understand is that the perlite won't absorb CO2 as no NaOH contained inside.

you are right , Cha Chi Gan.....otherwise perlite is an inert material.....

Yeah of course

Dear Gan, you can take help from the article, “Preparation of perlite-based carbon dioxide absorbent”. It can give you a detail picture regarding your quries.

Yes