Toluene Oxidation in the Absence and Presence of CO, CO2, Water and H2 over ZrO2-Based Gasification Gas Clean-Up Catalysts

Research output: Contribution to journalArticle


Research units

  • VTT Technical Research Centre of Finland


Gasification of biomass is an environmentally friendly way to produce electricity and syngas when combined with effective gas cleaning. ZrO2-based catalysts have been proven to remove undesired tar molecules when a convenient amount of oxygen is added. However, high activity in the tar oxidation is not the only requirement for the catalyst performance. The valuable gasification gas components, such as CO and H-2, must be protected while passing the complex gasification gas over the catalyst. Oxidation of toluene as a tar model compound was addressed by applying temperature-programmed surface reaction (TPSR) experiments with continuous feed of toluene, oxygen and one main gasification gas component (CO, CO2, H-2 or water) over pure and doped zirconias. The most water tolerant catalyst was pure ZrO2 and the least was SiO2-ZrO2. A new indicator called 'Preferentiality' was introduced and it expresses in one single quantity how well the catalyst is performing in tar conversion while protecting the valuable components of the gas. At 600 degrees C, the highest preferentiality of toluene oxidation over both CO and H-2 oxidation was achieved over pure ZrO2.


Original languageEnglish
Pages (from-to)1663-1670
Number of pages8
Issue number4
Publication statusPublished - 1 Feb 2017
MoE publication typeA1 Journal article-refereed

    Research areas

  • Effect of main gasification gas components, Gasification gas cleaning, Toluene oxidation, Zirconia, MONOCLINIC ZIRCONIA, SURFACE SITES, TEMPERATURE, INSIGHTS, REMOVAL, OXYGEN

ID: 16797959