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PublicationApplied Catalysis A: General
Year2011
Volume406
Pages34–42
International

Structural changes occurring at the surface of alumina-supported nanoscaled Mo-V-Nb-(Te)-O catalytic system during the selective oxidation of propane to acrylic acid

Authors:Ricardo López Medina, José Luis García Fierro, M. Olga Guerrero-Perez , Miguel A. Bañares
Groups of research:Spectroscopy and industrial catalysis, Sustainable Energy and Chemistry (EQS)

The effect of total coverage on alumina is evaluated for Mo5 V4 Nb1 /Al2 O3 catalysts by operando Raman- GC spectroscopy during reaction, demonstrating structural changes during reaction that do not occur during catalyst calcination. XRD detects show no appreciable change but Operando Raman-GC studies are sensitive to changes occurring in the nanometer scale, which modulate the performance during propane oxidation, delivering the structure–activity relationship for deactivation. Raman spectra confirm the formation of nanocrystalline MoO3-type structures during reaction up to 375C, accompanied by coke deposits, able to block the active sites, being detrimental for the acrylic acid formation. Three new catalysts were preparing by the addition of tellurium as dopant, in this case, the presence of MoO3 is not detected under reaction conditions, since the formation of a distorted rutile structure under reaction conditions is observed, and in this case acrylic acid is obtained as the main reaction product with a yield of ca. 25% at 400 C.

Keywords:Operando Raman Mo–V–Te–O Acrylic acid Structure–activity relationship Support-stabilized nanoparticle Nanostructured catalysts
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