title: Size- and shape-controlled synthesis and catalytic performance of iron-aluminum mixed oxide nanoparticles for NOX and SO₂ removal with hydrogen peroxide.
abstract: 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) 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°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 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 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 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.
authors.affiliation: School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu 210094, PR China; Nanjing AIREP Environmental Protection Technology Co., Ltd., Nanjing, Jiangsu 210091, PR China.
authors.forename: Jie
authors.initials: J
authors.lastname: Ding
authors.affiliation: School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu 210094, PR China; Nanjing AIREP Environmental Protection Technology Co., Ltd., Nanjing, Jiangsu 210091, PR China. Electronic address: zq304@mail.njust.edu.cn.
authors.forename: Qin
authors.initials: Q
authors.lastname: Zhong
authors.affiliation: School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu 210094, PR China; Nanjing AIREP Environmental Protection Technology Co., Ltd., Nanjing, Jiangsu 210091, PR China.
authors.forename: Shule
authors.initials: S
authors.lastname: Zhang
authors.affiliation: School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu 210094, PR China; Nanjing AIREP Environmental Protection Technology Co., Ltd., Nanjing, Jiangsu 210091, PR China.
authors.forename: Wei
authors.initials: W
authors.lastname: Cai
mesh_terms: D000535:Aluminum / Q000737:chemistry*; D002384:Catalysis; D006861:Hydrogen Peroxide / Q000737:chemistry*; D017665:Hydroxyl Radical / Q000737:chemistry; D007501:Iron / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D009569:Nitric Oxide / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D013458:Sulfur Dioxide / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D010087:Oxides; D013458:Sulfur Dioxide; D009569:Nitric Oxide; D017665:Hydroxyl Radical; D006861:Hydrogen Peroxide; D000535:Aluminum; D007501:Iron
keywords: Denitrification; Desulfurization; Flue gas purification; Hydrogen peroxide; Iron–aluminum mixed oxide nanoparticles