Kinetic study of the selective reduction of nitric oxide over vanadia—tungsta—titania/sepiolite catalyst

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Abstract

A kinetic study of the reduction of nitric oxide by ammonia in the presence of oxygen on a novel catalyst prepared as a physical mixture of V2O5-WO3/TiO2 catalyst and a natural silicate (sepiolite) was carried out. The steady-state differential reactor data were fitted to several equations using a discriminating method based on physical and statistic criteria. The best fit was obtained from a model involving adsorption of ammonia and oxygen which react with nitric oxide from the gas phase following an Eley-Rideal mechanism. The equation considered for this model reproduces well the experimental results obtained in a differential regime. Important limitations by internal diffusion were determined when the reaction took place in an integral regime.

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Subject classification (UKÄ) – MANDATORY

  • Chemical Engineering

Keywords

  • AMMONIA, KINETICS, NITRIC OXIDE REDUCTION, SELECTIVE CATALYTIC, REDUCTION, SEPIOLITE, TITANIA, TUNGSTA, VANADIA
Original languageEnglish
Pages (from-to)117-131
JournalApplied Catalysis B: Environmental
Volume5
Issue number1-2
Publication statusPublished - 1994
Publication categoryResearch
Peer-reviewedYes