There are a few products that are used for this. Here's a couple. I think it's something that should be done, but I'm sure some would disagree.
I don't think these will reverse any aging from acid that's already happened, just prevent more.
https://www.gaylord.com/Preservation...n-Spray/p/PT22
https://archival.com/deacid.html
https://www.unitedmfrs.com/Archival_Mist_p/5372.htm