Jump to main content
Jump to site search

Issue 34, 2016
Previous Article Next Article

Molybdena deposited on titania by equilibrium deposition filtration: structural evolution of oxo–molybdenum(vi) sites with temperature

Author affiliations

Abstract

The equilibrium deposition filtration (EDF) method, an advanced catalyst synthesis route that is based on a molecular level approach, can be used for tailoring the oxometallic phase deposited on a porous oxide support. Here, the EDF method is used for synthesizing (MoOx)n/TiO2 catalysts. In situ Raman spectroscopy in the temperature range of 25–450 °C, low temperature (77 K) EPR spectroscopy and DR-UV spectroscopy are used for studying the evolution of the structural configuration of oxo–MoVI species on TiO2 with increasing temperature as well as the influence of the supported (MoOx)n species on the photo-generation of electrons and holes of TiO2. This study concerns (MoOx)n/TiO2 samples in which the surface densities after calcination are 0.3, 2.6 and 3.9 Mo per nm2, thereby covering a very wide range of submonolayer coverage. The gradual heat treatment of the catalysts results in a transformation of the initially (prior to drying) deposited species and the pertinent species evolution at the nano-level is discussed by means of a number of mechanisms including anchoring, association, cleavage and surface diffusion.

Graphical abstract: Molybdena deposited on titania by equilibrium deposition filtration: structural evolution of oxo–molybdenum(vi) sites with temperature

Back to tab navigation

Supplementary files

Publication details

The article was received on 28 Jul 2016, accepted on 02 Aug 2016 and first published on 05 Aug 2016


Article type: Paper
DOI: 10.1039/C6CP05247A
Phys. Chem. Chem. Phys., 2016,18, 23980-23989

  •   Request permissions

    Molybdena deposited on titania by equilibrium deposition filtration: structural evolution of oxo–molybdenum(VI) sites with temperature

    G. Tsilomelekis, G. D. Panagiotou, P. Stathi, A. G. Kalampounias, K. Bourikas, C. Kordulis, Y. Deligiannakis, S. Boghosian and A. Lycourghiotis, Phys. Chem. Chem. Phys., 2016, 18, 23980
    DOI: 10.1039/C6CP05247A

Search articles by author

Spotlight

Advertisements