College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao, 266590, Shandong Province, China.
State Key Laboratory of Mining Disaster Prevention and Control Co-Found By Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao, 266590, China.
Environ Geochem Health. 2023 Jul;45(7):5357-5369. doi: 10.1007/s10653-023-01582-z. Epub 2023 May 3.
A series of Mn/γ-AlO, Mn-Cu/γ-AlO, Mn-Ce/γ-AlO and Mn-Ce-Cu/γ-AlO catalysts were prepared by equal volume impregnation. The denitrification effects of the different catalysts were studied by activity measurement, X-ray diffraction, Brunauer, Emmett, and Teller surface area tests, Scanning electron microscopy, H-temperature programmed reduction and Fourier-transform infrared spectroscopy. The experimental results show that Ce and Cu are added to a Mn/γ-AlO catalyst as bimetallic additives, which weakens the interaction between Mn and the carrier, improves the dispersion of MnO on the surface of the carrier, improves the specific surface area of the catalyst, and improves the reducibility. Mn-Ce-Cu/γ-AlO catalyst reaches a maximum conversion of 92% at 202 °C. Also, the addition of the auxiliary metals promotes the reaction mechanism to a certain extent, and the addition of Ce especially promotes the conversion of NO-NO, which is conducive to the production of intermediate products that promote the NH-SCR reaction.
采用等体积浸渍法制备了一系列 Mn/γ-AlO、Mn-Cu/γ-AlO、Mn-Ce/γ-AlO 和 Mn-Ce-Cu/γ-AlO 催化剂。通过活性测试、X 射线衍射、Brunauer-Emmett-Teller 比表面积测试、扫描电子显微镜、H2-程序升温还原和傅里叶变换红外光谱研究了不同催化剂的脱硝效果。实验结果表明，Ce 和 Cu 作为双金属添加剂添加到 Mn/γ-AlO 催化剂中，削弱了 Mn 与载体之间的相互作用，提高了 MnO 在载体表面的分散性，提高了催化剂的比表面积，提高了还原性能。Mn-Ce-Cu/γ-AlO 催化剂在 202°C 时达到了 92%的最大转化率。此外，辅助金属的添加在一定程度上促进了反应机制，Ce 的添加特别促进了 NO-NO 的转化，有利于产生促进 NH-SCR 反应的中间产物。
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