Study on the Synthesis of Cux-UZM-5 Catalysts and Their NH3-SCR DeNOx Performance
LI Rui, HE Xinyue, LYU Jiangang, YANG Weimin
State Key Laboratory of Green Chemical Engineering and Industrial Catalysis, SINOPEC Shanghai Research Institute of Petrochemical Technology Company Limited, Shanghai 201208, China
Abstract：UZM-5 molecular sieves were synthesized using the charge density mismatch (CDM) method, and a series of Cux-UZM-5 catalysts were prepared via copper ion exchange. Their catalytic performance in the selective catalytic reduction of NOx with ammonia (NH3-SCR) under simulated diesel exhaust conditions was systematically investigated. The results showed that NOx conversion efficiency increased with the copper exchange level. The Cu2.16-UZM-5 catalyst, with a copper loading of 2.16% (mass fraction), exhibited over 90% NOx conversion within the temperature range of 270-600? ℃, demonstrating excellent denitrification performance. Structural and surface analyses confirmed that Cu2+ was the main active species, effectively enhancing low-temperature activity. Additionally, the introduction of copper increased the number of Cu2+ sites and created new acid sites, further promoting the NH3-SCR reaction. Overall, Cux-UZM-5 catalysts showed promising potential for the application in NOx removal from diesel exhaust.
LI Rui,HE Xinyue,LYU Jiangang et al. Study on the Synthesis of Cux-UZM-5 Catalysts and Their NH3-SCR DeNOx Performance[J]. Chemical Reaction Engineering and Technology, 2025, 41(4): 457-465.
