XAFS analysis for niobium carbide particle growth on silica support during preparation process

摘要

SiO_2-supported NbC catalysts were prepared by using temperature-programmed reactions (TPR). XAFS analysis confirmed that Nb_2O_5 was reduced to NbO_2 in the first TPR stage and converted into NbC in the second TPR stage. Nb particles grew only in the second TPR stage. Formation of highly dispersed NbC particles on SiO_2 surfaces was achieved.