Ultralow Loading of Silver Nanoparticles on Mn2O3 Nanowires Derived with Molten Salts: A High-Efficiency Catalyst for the Oxidative Removal of Toluene.

Using a mixture of NaNO3 and NaF as molten salt and MnSO4 and AgNO3 as metal precursors, 0.13 wt % Ag/Mn2O3 nanowires (0.13Ag/Mn2O3-ms) were fabricated after calcination at 420 °C for 2 h. Compared to the counterparts derived via the impregnation and poly(vinyl alcohol)-protected reduction routes as well as the bulk Mn2O3-supported silver catalyst, 0.13Ag/Mn2O3-ms exhibited a much higher catalytic activity for toluene oxidation. At a toluene/oxygen molar ratio of 1/400 and a space velocity of 40,000 mL/(g h), toluene could be completely oxidized into CO2 and H2O at 220 °C over the 0.13Ag/Mn2O3-ms catalyst. Furthermore, the toluene consumption rate per gram of noble metal over 0.13Ag/Mn2O3-ms was dozens of times as high as that over the supported Au or AuPd alloy catalysts reported in our previous works. It is concluded that the excellent catalytic activity of 0.13Ag/Mn2O3-ms was associated with its high dispersion of silver nanoparticles on the surface of Mn2O3 nanowires and good low-temperature reducibility. Due to high efficiency, good stability, low cost, and convenient preparation, 0.13Ag/Mn2O3-ms is a promising catalyst for the practical removal of volatile organic compounds.

[1]  D. Fino,et al.  Mesoporous manganese oxides prepared by solution combustion synthesis as catalysts for the total oxidation of VOCs , 2015 .

[2]  G. Guo,et al.  Au–Pd/3DOM Co3O4: Highly active and stable nanocatalysts for toluene oxidation , 2015 .

[3]  B. Su,et al.  Hierarchically nanostructured porous group Vb metal oxides from alkoxide precursors and their role in the catalytic remediation of VOCs , 2015 .

[4]  Yang Jiang,et al.  Au/Ce0.6Zr0.3Y0.1O2 Nanorods: Highly Active Catalysts for the Oxidation of Carbon Monoxide and Toluene , 2014 .

[5]  G. Guo,et al.  Preparation and high catalytic performance of Au/3DOM Mn2O3 for the oxidation of carbon monoxide and toluene. , 2014, Journal of hazardous materials.

[6]  Jiaguo Yu,et al.  Efficient removal of formaldehyde by nanosized gold on well-defined CeO₂ nanorods at room temperature. , 2014, Environmental science & technology.

[7]  Yang Jiang,et al.  Porous cube-aggregated Co3O4 microsphere-supported gold nanoparticles for oxidation of carbon monoxide and toluene. , 2014, ChemSusChem.

[8]  Changbin Zhang,et al.  Sodium-promoted Pd/TiO2 for catalytic oxidation of formaldehyde at ambient temperature. , 2014, Environmental science & technology.

[9]  Jinjun Li,et al.  Low-temperature removal of toluene and propanal over highly active mesoporous CuCeOx catalysts synthesized via a simple self-precipitation protocol , 2014 .

[10]  C. Au,et al.  Gold Supported on Iron Oxide Nanodisk as Efficient Catalyst for The Removal of Toluene , 2014 .

[11]  Yang Jiang,et al.  Mesoporous Co3O4-supported gold nanocatalysts: Highly active for the oxidation of carbon monoxide, benzene, toluene, and o-xylene , 2014 .

[12]  H. Arandiyan,et al.  Three-dimensionally ordered macroporous La0.6Sr0.4MnO3 with high surface areas: Active catalysts for the combustion of methane , 2013 .

[13]  Yang Jiang,et al.  Au/3DOM Co3O4: highly active nanocatalysts for the oxidation of carbon monoxide and toluene. , 2013, Nanoscale.

[14]  Hong He,et al.  Well-dispersed palladium supported on ordered mesoporous Co3O4 for catalytic oxidation of o-xylene ☆ , 2013 .

[15]  G. Guo,et al.  Au/3DOM La0.6Sr0.4MnO3: Highly active nanocatalysts for the oxidation of carbon monoxide and toluene , 2013 .

[16]  G. Guo,et al.  PMMA-templating generation and high catalytic performance of chain-like ordered macroporous LaMnO3 supported gold nanocatalysts for the oxidation of carbon monoxide and toluene , 2013 .

[17]  G. Guo,et al.  Au/3DOM LaCoO3: High-performance catalysts for the oxidation of carbon monoxide and toluene , 2013 .

[18]  Shuiyuan Cheng,et al.  Nanosized Au supported on three-dimensionally ordered mesoporous β-MnO2: Highly active catalysts for the low-temperature oxidation of carbon monoxide, benzene, and toluene , 2013 .

[19]  Q. Fu,et al.  The improved reactivity of manganese catalysts by Ag in catalytic oxidation of toluene , 2013 .

[20]  M. Flytzani-Stephanopoulos,et al.  Alkali-metal-promoted Pt/TiO2 opens a more efficient pathway to formaldehyde oxidation at ambient temperatures. , 2012, Angewandte Chemie.

[21]  L. Liotta,et al.  Supported gold catalysts for the total oxidation of volatile organic compounds , 2012 .

[22]  J. Hao,et al.  Catalytically active single-atom sites fabricated from silver particles. , 2012, Angewandte Chemie.

[23]  F. Wang,et al.  Manganese oxides with rod-, wire-, tube-, and flower-like morphologies: highly effective catalysts for the removal of toluene. , 2012, Environmental science & technology.

[24]  J. Figueiredo,et al.  Total oxidation of ethyl acetate, ethanol and toluene catalyzed by exotemplated manganese and cerium oxides loaded with gold , 2012 .

[25]  Donghui Wang,et al.  Investigation of formaldehyde oxidation over Co3O4-Ce2 and Au/Co3O4-CeO2 catalysts at room temperature: effective removal and determination of reaction mechanism. , 2011, Environmental science & technology.

[26]  Chunming Xu,et al.  Highly active catalysts of gold nanoparticles supported on three-dimensionally ordered macroporous LaFeO3 for soot oxidation. , 2011, Angewandte Chemie.

[27]  X. Jiao,et al.  Long single-crystalline α-Mn2O3 nanowires: facile synthesis and catalytic properties , 2010 .

[28]  G. Lu,et al.  Mesoporous Co3O4 and Au/Co3O4 catalysts for low-temperature oxidation of trace ethylene. , 2010, Journal of the American Chemical Society.

[29]  A. Boréave,et al.  La(1−x)SrxCo1−yFeyO3 perovskites prepared by sol–gel method: Characterization and relationships with catalytic properties for total oxidation of toluene , 2009 .

[30]  Hong He,et al.  Catalytic performance and mechanism of a Pt/TiO2 catalyst for the oxidation of formaldehyde at room temperature , 2006 .

[31]  Hong He,et al.  Perfect catalytic oxidation of formaldehyde over a Pt/TiO2 catalyst at room temperature , 2005 .

[32]  A. Bell,et al.  Structure and properties of oxidative dehydrogenation catalysts based on MoO3/Al2O3 , 2001 .