Figure shows the number of phosphate-containing oligomers, toluene, and cresol molecules formed from TCP at 500 K and 3 GPa on the three surfaces. On iron and iron carbide, the primary product of TCP decomposition is cresol, formed by P-O bond cleavage. Some toluene is also formed on these surfaces via C-O cleavage, but this occurs only after the formation of cresol. The number of oligomers formed is similar for all three surfaces. However, on iron oxide, phosphate-containing oligomers are the major product.