(639c) Facile Induction of Mesoporosity within Crystalline Metal-Oxides By Hydrogen Peroxide Treatment

Authors: 
Colon, J., Rutgers, The State University of New Jersey
Ruckodanov, D., Rutgers, The State University of New Jersey
Landers, J. M., Edgewood Chemical Biological Center
Neimark, A., Rutgers, The State University of New Jersey
Metal-oxides are widely used in several applications such as water purification, photo-catalysis, chemical warfare agent (CWA) decomposition, given that they are relatively easy to synthesize and cost-effective. Within the CWA decomposition field, metal-oxides are particularly effective, as they have the ability to hydrolyze CWA and CWA-surrogates, such as phosphor-organic and mustard agents into non-toxic products. Crystalline metal-oxides typically exhibit low surface area. This means that their catalytic activity relies mostly on surface interactions. Surface chemistry within metal-oxides play an important role into the adsorption and consequent decomposition of CWA. Therefore, incorporating mesoporosity within metal-oxides can significantly enhance transport, accessibility of reactive sites, adsorption capacity, thus improving their overall catalytic activity. Crystalline zinc, cerium and zirconium oxides were synthesized by typical sol-gel techniques and were found to be non-porous. Nitrogen adsorption experiments demonstrate that adding crystalline metal-oxides into a solution of hydrogen peroxide facilitates the formation of mesopores. X-ray photoelectron spectroscopy (XPS) data suggest that one important factor in the formation of mesopores is due to the removal of lattice-bound water molecules from crystalline metal-oxides.