Zhang, Jie Huang, Zhiwei Du, Yueyao Sánchez-Ochoa, Francisco Wu, Xiaomin Jing, Guohua Identification of Active Sites over Fe<sub>2</sub>O<sub>3</sub>‑Based Architecture: The Promotion Effect of H<sub>2</sub>SO<sub>4</sub> Erosion Synthetic Protocol Knowledge of tuning the composition and structure of the active sites is crucial for understanding and improving the properties of catalysts. Here, we report that selective catalytic reduction (SCR) of NO<sub><i>x</i></sub> using ammonia over Fe<sub>2</sub>O<sub>3</sub> nanoparticle is boosted by a nanometric Fe<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub> shell, which is generated via a facile H<sub>2</sub>SO<sub>4</sub> erosion synthetic protocol. The Fe<sub>2</sub>O<sub>3</sub>–H<sub>2</sub>SO<sub>4</sub> erosion sample consists of a well-defined hexagon shape Fe<sub>2</sub>O<sub>3</sub> core and a 1 nm thin Fe<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub> shell formed by H<sub>2</sub>SO<sub>4</sub> erosion as evidenced by transmission electron microscopy measurements. A set of control experiments show that pure Fe<sub>2</sub>O<sub>3</sub> or Fe<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub> alone cannot fully account for the high catalytic performance of the Fe<sub>2</sub>O<sub>3</sub>–H<sub>2</sub>SO<sub>4</sub> erosion sample. By combining electron microscopy, activity measurement, surface area titration, and temperature-programmed desorption and surface reaction, we show that reactants are activated within a zone at the surface interface of Fe<sub>2</sub>O<sub>3</sub> and Fe<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub> on the as-prepared Fe<sub>2</sub>O<sub>3</sub>–H<sub>2</sub>SO<sub>4</sub> erosion sample. Fe 2 O 3;3 shell;4 erosion sample;SCR;hexagon shape Fe 2 O 3 core;transmission electron microscopy measurements;nanometric Fe 2;Fe 2;4 erosion;control experiments show;H 2;surface area titration;Fe 2 O 3 nanoparticle 2018-05-30
    https://acs.figshare.com/articles/journal_contribution/Identification_of_Active_Sites_over_Fe_sub_2_sub_O_sub_3_sub_Based_Architecture_The_Promotion_Effect_of_H_sub_2_sub_SO_sub_4_sub_Erosion_Synthetic_Protocol/6402524
10.1021/acsaem.8b00353.s001