Article ID Journal Published Year Pages File Type
5420567 Solid State Nuclear Magnetic Resonance 2010 9 Pages PDF
Abstract
27Al MAS and 3QMAS NMR have been used to study Al2O3/TiO2 catalyst supports synthesized via excess-solution impregnation and surface sol-gel methods. Temperature and alumina loading level strongly affect chemical states of aluminum oxide species observed. Surface cations, Al(H2O)63+, a surface alumina monolayer, and disordered transitional aluminas (multilayers) and α-alumina, coexist on the TiO2 surface. Chemical shift and quadrupole coupling constants are reported for the major species identified in 3QMAS experiments. Gold particle catalysts prepared from supports calcined at 500 °C have optimum catalytic activity in CO oxidation, and smallest gold particle size for supports, which show maximum monolayer type octahedral alumina on the titania surface.
Related Topics
Physical Sciences and Engineering Chemistry Physical and Theoretical Chemistry
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