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Published on: April 10, 2018
Revealing the Dynamic Behavior of Active Sites on Acid-Functionalized CeO2 Catalysts for NO Reduction
Pan Zhang1, Aling Chen1, Tianwei Lan1
1International Joint Laboratory of Catalytic Chemistry, State Key Laboratory of Advanced Special Steel, College of Sciences, Shanghai University, No.99 Shangda Road, Shanghai 200444, P. R. China.
Abstract:
Unraveling the dynamics of the active sites upon CeO2-based catalysts in selective catalytic reduction of nitrogen oxides by ammonia (NH3-SCR) is challenging. In this work, we prepared tungsten-acidified and sulfated CeO2 catalysts and used operando spectroscopy to reveal the dynamics of acid sites and redox sites on catalysts during NH3-SCR reaction. We found that both Lewis and Brønsted acid sites are needed to participate in the catalytic reaction. Notably, Brønsted acid sites are the main active sites after a tungsten-acidified or sulfated treatment, and the change of Brønsted acid sites significantly affects the NO removal. Moreover, acid functionalization promotes the cerium species cycle between Ce4+ and Ce3+ for the NO reduction. This work is critical to deeply understanding the natural properties of active sites, and it also provides new insights into the mechanism for NH3-SCR over CeO2-based catalysts.
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