Experimental Study on Preparation and Operating Conditions over a Promising Monolithic Catalysts for NO_x Removal: MnO_x/TiO₂/Cordierite

Abstract:

The samples of MnO_x/TiO₂ catalysts supported on cordierite honeycomb ceramics were prepared by a sol-gel-impregnation method, and evaluated for low-temperature (353-473 K) selective catalytic reduction (SCR) of NO_x with NH₃. The influences of pretreatment on cordierite and catalyst dosage were investigated at first and optimized as follows: pickling for cordierite honeycomb ceramics with 1 mol/L HNO₃ for 3 h prior to loading procedure as well as the catalyst dosage of 3-5 wt.%. The activity results indicated that there was an optimum working condition for MnO_x/TiO₂/cordierite catalysts: NH₃/NO molar ratio=1.1, [O₂]=3 vol.%, GHSV=5514 h^-1, the highest activity of nearly 100% NO conversion could be obtained. As a comparison, the performances of commercialized vanadium-based honeycomb catalyst were also employed, which revealed the narrower scope of application of GHSV and the higher active temperature window. In conclusion, it turns out that the prepared MnO_x/TiO₂/cordierite catalysts are more applicable as a low-temperature SCR catalyst for NO_x removal in a more complicated application environment.

• Periodical: Materials Science Forum (Volume 898)
• Pages: 1905-1915
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.898.1905
• Online since: June 2017
• Authors: Kai Qi, Jun Lin Xie*, Feng Xiang Li, Feng He
• Keywords: MnO_x/TiO₂/Cordierite, Monolithic Catalysts, NH₃-SCR, Operating Conditions

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