High-Energy Ball Milling-Assisted Synthesis of Small-Particle Cu-ZK-5 Zeolites and Study on Its NH3-SCR Performance
Zhang Zongzheng1,2, An Sufeng2, Wang Xuehai2, Li Yingxia1, Wu Dengfeng1, Cheng Daojian1
1. College of Chemical Engineering, Beijing University of Chemical Technology, Beijing Key Laboratory of Intelligent Design and Manufacturing for Hydrogen Energy Materials, Beijing 100029, China;
2. SINOPEC (Dalian) Research Institute of Petroleum and Petrochemicals Company Limited, Dalian 116045, China
Abstract： Ammonia selective catalytic reduction (NH3-SCR) is regarded as an effective technology for the removal of nitrogen oxides (NOx) from both stationary and mobile sources. Cu-ZK-5 zeolites have received extensive attention due to their advantages such as excellent SCR activity, high N2 selectivity and hydrothermal stability. However, in the preparation process of Cu-ZK-5 zeolites, problems such as long preparation cycle and large particle size caused by the slow growth of ZK-5 zeolite seeds are often encountered. Therefore, it is of great significance to develop an efficient and rapid synthesis method for ZK-5 zeolites. The ZK-5 zeolite with small particle size (1.2 μm) was rapidly synthesized by the high-energy ball milling assisted solvothermal method, and then the Cu-ZK-5 zeolite was prepared by the liquid-phase ion exchange method. Compared with the traditional preparation process, the synthesis time of Cu-ZK-5 zeolite had been significantly shortened. The influences of crystallization temperature, pressure and crystallization time on the synthesis of ZK-5 zeolite were explored. When the crystallization temperature was 140 ℃ and the crystallization pressure was 1.29 MPa, the synthesized Cu-ZK-5-BM zeolite catalyst exhibited excellent wide-temperature NH3-SCR denitrification activity. Under the conditions of high altitude, high speed and water vapor, within the range of 200 ℃ to 550 ℃, the denitrification rate reached over 98%. The research results of this paper provided new ideas for developing rapid and efficient synthesis strategies of small-particle zeolite catalysts, and could also be extended to the green synthesis of other small-pore zeolites.
Zhang Zongzheng,An Sufeng,Wang Xuehai et al. High-Energy Ball Milling-Assisted Synthesis of Small-Particle Cu-ZK-5 Zeolites and Study on Its NH3-SCR Performance[J]. Chemical Reaction Engineering and Technology, 2026, 42(4): 332-340.
