Iron-modified MCM-48 mesoporous Mo- lecular sieves

摘要

MCM-48 mesoporous molecular sieves contain- ing iron(Ⅲ) were obtained using a direct sol- gel rout followed by removal of the cetyltrim- ethylammonium hydroxide template before calcinations. UV-visible, ESR, and XANES spectrosopies show that iron mostly occupies tetrahedral sites of the siliceous walls. The formation of oxide nanoclusters in the channels is favored in the presence of the organic tem- plate molecules during calcinations.