Under construction,
http://bekbiochar.pbworks.com/Raw-Science:-Drying,-Torrefaction,-and-Pyrolysis
http://www.musketeer.ch/blackpowder/charcoal.html
Sustainable Biochar to Mitigate Global Climate Change. Published August 10, 2010
Dominic Woolf, James E. Amonette, F.Alayne Street-Perrott, Johannes Leymann, & Stephen Joseph
http://www.nature.com/ncomms/journal/v1/n5/full/ncomms1053.html
Process for Making Activated Carbon, G. W. Wallace: Patented August 16, 1927