Metals or metal compounds with a high chemical affinity for the heteroatoms in the carbons. They are distributed as fine particles within the carbon materials to be graphitized.
Note:
Iron and iron compounds are most frequently used as @P04941@ inhibitors when @P04941@ is related to sulfur.
Source:
PAC, 1995, 67, 473. 'Recommended terminology for the description of carbon as a solid (IUPAC Recommendations 1995)' on page 502 (https://doi.org/10.1351/pac199567030473)