期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 283, 期 -, 页码 633-642出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2014.10.010
关键词
Iron-aluminum mixed oxide nanoparticles; Denitrification; Desulfurization; Hydrogen peroxide; Flue gas purification
资金
- National Natural Science Foundation of China [U1162119]
- Assembly Foundation of the Industry and Information Ministry of the People's Republic of China [543]
- Research and Innovation Plan for Postgraduates of Jiangsu Province [CXZZ13_0215]
- Research Fund for Scientific Research Project of Environmental Protection Department of Jiangsu Province [2013003, 201212]
- Industry-Academia Cooperation Innovation Fund Projects of Jiangsu Province [BY2012025]
- Scientific Research Project of Enviromental Protection Department of Jiangsu Province [201112]
A novel, simple, reproducible and low-cost strategy is introduced for the size- and shape-controlled synthesis of iron-aluminum mixed oxide nanoparticles (NIAO(x/y)). The as-synthesized NIAO(x/y) catalyze decomposition of H2O2 yielding highly reactive hydroxyl radicals ((OH)-O-center dot) for NOx and SO2 removal. 100% SO2 removal is achieved. NIAO(x/y) with Fe/Al molar ratio of 7/3 (NIAO(7/3)) shows the highest NOx removal of nearly 80% at >170 degrees C, whereas much lower NOx removal (<63%) is obtained for NIAO(3/7). The melting of aluminum oxides in NIAO(7/3) promotes the formation of lamellar products, thus improving the specific surface areas and mesoporous distribution, benefiting the production of (OH)-O-center dot radicals. Furthermore, the NIAO(7/3) leads to the minor increase of points of zero charges (PZC), apparent enhancement of FeOH content and high oxidizing ability of Fe(III), further improving the production of (OH)-O-center dot radicals. However, the NIAO(3/7) results in the formation of aluminum surface-enriched spherical particles, thus decreasing the surface atomic ratio,of iron oxides, decreasing (OH)-O-center dot radical production. More importantly, the generation of FeOAl causes the decline of active sites. Finally, the catalytic decomposition of H2O2 on NIAO(x/y) is proposed. And the well catalytic stability of NIAO(7/3) is obtained for evaluation of 30 h. (C) 2014 Elsevier B.V. All rights reserved.
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