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In this study, we synthesized V 2 O 5 -WO 3 /TiO 2 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 2 O 5 and WO 3 , increasing the availability of both Brønsted and Lewis acid sites, while the one-sided method produced amorphous V 2 O 5 and WO 3 . The crystalline structure of the two species significantly enhanced NO 2 formation, causing more rapid selective catalytic reduction (SCR) reactions and greater catalyst reducibility for NO X decomposition. This improved NO X removal efficiency and N 2 selectivity for a wider temperature range of 200 °C-450 °C. Additionally, the synthesized, crystalline catalysts exhibited good resistance to SO 2 , 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.

Effect of Catalyst Crystallinity on V-Based Selective Catalytic Reduction with Ammonia