X-Ray diffraction, F.t.i.r., scanning electron microscopy (SEM) and ionscattering spectroscopy (ISS) have been applied to characterize a series of Moo,-TiO, (anatase) samples prepared by the grafting and impregnation methods. The sample prepared with the grafting method exhibits good dispersion of MOO,, whereas the impregnation technique leads to a poorer dispersion of molybdena on the surface of titania. The poorer dispersion of MOO, is due to the clustering of molybdena when the MOO, loading does not exceed the theoretical monolayer coverage (6.3 wt % MOO,). At higher MOO, loading, crystals of MOO, of morphology different from pure MOO, crystals, appear. A possible explanation of this phenomenon is discussed.
ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract A series of MoO3-anatase catalysts are prepared by grafting and impregnation methods and characterized by XRD, FTIR, SEM, XPS, and ISS in order to determine the nature of MoO3 when the monolayer coverage is exceeded. It is established that well dispersed MoO3 can be obtained as a monolayer with the grafting method. The impregnation method leads to worse dispersion of MoO3 on the anatase surface due to clustering of molybdena. At MoO3 loadings higher than the theoretical monolayer coverage (6.3 wt.% MoO3) epitaxially grown MoO3 crystals appear and their epitaxial growth produces a specific morphology of the MoO3 crystals.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.