Article ID Journal Published Year Pages File Type
61854 Journal of Catalysis 2010 9 Pages PDF
Abstract

A series of CuOx/WOx–ZrO2 catalysts were synthesized by impregnating different amounts of copper on the coprecipitated WOx–ZrO2 support and were characterized by XRD, BET, XPS, NH3/NO chemisorption, NH3-TPO and NH3-SCR activity measurements. A wide temperature range (200–320 °C) in which NO conversion exceeds 80% is achieved on the 10 wt.% CuOx/WOx–ZrO2 catalyst. The activity and selectivity of the catalysts for ammonia oxidation and NH3-SCR reaction are determined by the strength and amount of Lewis acid sites and Brønsted acid sites, which are adjusted by the formation of WOx–ZrO2 solid solutions and the addition of copper oxides. Two different reaction routes, “ammonia–NO2 route” at low temperatures (<200 °C) and “amine–NO/NO2” at high temperatures (>250 °C), are presented for SCR reaction over CuOx/WOx–ZrO2 catalysts.

Graphical abstractTwo NH3-SCR mechanisms on CuOx/WOx–ZrO2 catalysts: “ammonia–NO2 route” (<200 °C) and “amine–NO/NO2 route” (>250 °C) related with Lewis and Brønsted acid sites.Figure optionsDownload full-size imageDownload high-quality image (88 K)Download as PowerPoint slide

Related Topics
Physical Sciences and Engineering Chemical Engineering Catalysis
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