| Summary: | In this study, we synthesized V<sub>2</sub>O<sub>5</sub>-WO<sub>3</sub>/TiO<sub>2</sub> catalysts with different crystallinities via one-sided and isotropic heating methods. We then investigated the effects of the catalysts’ crystallinity on their acidity, surface species, and catalytic performance through various analysis techniques and a fixed-bed reactor experiment. The isotropic heating method produced crystalline V<sub>2</sub>O<sub>5</sub> and WO<sub>3</sub>, increasing the availability of both Brønsted and Lewis acid sites, while the one-sided method produced amorphous V<sub>2</sub>O<sub>5</sub> and WO<sub>3</sub>. The crystalline structure of the two species significantly enhanced NO<sub>2</sub> formation, causing more rapid selective catalytic reduction (SCR) reactions and greater catalyst reducibility for NO<sub>X</sub> decomposition. This improved NO<sub>X</sub> removal efficiency and N<sub>2</sub> selectivity for a wider temperature range of 200 °C–450 °C. Additionally, the synthesized, crystalline catalysts exhibited good resistance to SO<sub>2</sub>, which is common in industrial flue gases. Through the results reported herein, this study may contribute to future studies on SCR catalysts and other catalyst systems.
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