Cationic detergents are cleaning agents or soaps that contain positively charged molecules. They are used to clean various surfaces by attracting dirt and grease, making it easier to remove them. Full definition
You might recognize batteries and fireworks as objects that can leak corrosive material, and therefore should not be consumed, (seriously, some dogs will really eat anything) but did you know that fabric sheets contain cationic detergents? (doorbellvet.com)
Once you have prevented further exposure to the potpourri oil, you should contact your veterinarian or an animal poison center and be ready to give the ingredients of the potpourri to determine if there are cationic detergents in the liquid, in addition to the essential oils. (cfa.org)
Many cleansers, and even fabric softeners and dryer sheets with cationic detergents are toxic to cats. (cat-lovers-only.com)