Post 75 o C O 2 protocol no large Fe x O y par�cles are seen from EDXS and limited Fe clusters from HAADF-STEM (Figure , Figure ). No significant change from the pris�ne TAP 900@Fe structure is observed a�er 20 o C O 2 and Ar protocols, (Figure ); however, a�er 75 o C O 2 protocol a denser par�cle structure is observed (Figure ).