# Science of charcoal activation **URL:** http://forum.driveonwood.com/t/science-of-charcoal-activation/4445 **Category:** Woodgas Science **Created:** [March 28, 2019, 10:23am UTC](http://forum.driveonwood.com/t/science-of-charcoal-activation/4445 "2019-03-28T10:23:03Z") **Posts on this page:** 1 **Showing post:** 14
### Author: ![madflower69](https://avatars.discourse-cdn.com/v2/letter/m/ebca7d/32.png) [@madflower69](http://forum.driveonwood.com/u/madflower69) #### Post date: [January 24, 2023, 10:04am UTC](http://forum.driveonwood.com/t/science-of-charcoal-activation/4445/14 "2023-01-24T10:04:09Z")
> [@KKubu](#): > > bulk adsorption storage or gas separation. It helps to know what gas or gases. I am assuming this is natural gas, and not a gas mask. I do not know how to do the math or if it is possible to get from say the iodine test to porosity in say angstroms. This might be closer to what you are looking for: [https://sci-hub.se/https://doi.org/10.1016/0008-6223(95)00128-X](https://sci-hub.se/https://doi.org/10.1016/0008-6223(95)00128-X) There might be something useful in this thread as well: > [@Is CaCl2 needed for activated charcoal?](http://forum.driveonwood.com/t/is-cacl2-needed-for-activated-charcoal/6824): > > I want to make charcoal for fuel but am interested in what it takes to make “activated charcoal”. In looking at a few sites, instructions include soaking in a CaCl2 (calcium chloride) solution. CaCl2 is a desiccant. I’m wondering about the purpose of the CaCl2. One site said to use either bleach or lemon juice if CaCl2 isn’t available. A chemist buddy used to make biochar through pyrolysis. He said char was hydrophobic to the point of being pretty much rot resistant. If the pyrolysis drives off… --- _[View the full topic](http://forum.driveonwood.com/t/science-of-charcoal-activation/4445)._