文献类型：期刊文献

英文题名：Low-Temperature NH3-SCR over Pr-Modified Mn-Fe Oxides: Widened Activity Window and Enhanced SO2 and H2O Tolerance

作者：Zhang, Qiyao[1];Hu, Xu[1];Lei, Tiantian[1];Huang, Yongmin[1]

机构：[1]East China Univ Sci & Technol, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China

年份：2026

卷号：65

期号：19

起止页码：9893

外文期刊名：INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH

收录：;EI(收录号：20262120750764);WOS:【SCI-EXPANDED(收录号:WOS:001757684900001)】；

基金：This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors. We thank the Research Center for Analysis and Testing at East China University of Science and Technology (ECUST) for analytical assistance.

语种：英文

外文关键词：Binary alloys - Fits and tolerances - Fourier transform infrared spectroscopy - Iron oxides - Manganese compounds - Nitrogen oxides - Praseodymium - Praseodymium compounds - Scanning electron microscopy - Temperature - X ray diffraction

摘要：Pr-modified Mn-Fe mixed oxides were synthesized via a solvothermal method and systematically characterized (Brunauer-Emmett-Teller (BET), X-ray diffraction (XRD), Field emission scanning electron microscopy (FESEM), X-ray photoelectron spectroscopy (XPS), NH3-TPD, H-2-TPR, O-2-TPD, Py-IR, Raman spectroscopy, and in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS)). At a Pr/Mn molar ratio of 0.1, MnFePr0.1Ox achieved a high NOx conversion from 90 to 300 degrees C at GHSV = 50,000 h(-1)(>94%). MnFePr0.1Ox N-2 selectivity decreased from 98% at 90 degrees C to 72% at 270 degrees C, and it remained 6-10% higher than that of MnFe0.7Ox across the temperature range. Under 50 ppm of SO2 and 10 vol % H2O at 150 degrees C, MnFePr0.1Ox maintained high activity (>99%) for 10 h, while MnFe0.7Ox deactivated to 30%. The enhanced performance is attributed to the enrichment of Mn4+ and surface-adsorbed oxygen and a regulated acidity with redistributed acid-site characteristics. In situ DRIFTS revealed coexisting Langmuir-Hinshelwood and Eley-Rideal mechanisms. Pr incorporation further enhanced NOx adsorption and stabilized surface NH3 species, suggesting robust cooperative reactivity under SO2 and H2O exposure.