Au/MnOx/3DOM SiO2: Highly active catalysts for toluene oxidation

Huanggen Yang; Jiguang Deng; Shaohua Xie; Yang Jiang; Hongxing Dai; Chak Tong Au

doi:10.1016/j.apcata.2015.09.043

Au/MnO_x/3DOM SiO₂: Highly active catalysts for toluene oxidation

Huanggen Yang
, Jiguang Deng^*
, Shaohua Xie
, Yang Jiang
, Hongxing Dai
, Chak Tong Au

^*Corresponding author for this work

Department of Chemistry

Research output: Contribution to journal › Journal article › peer-review

39 Citations (Scopus)

Abstract

Three-dimensionally ordered macro-/mesoporous silica (3DOM SiO₂)-supported manganese oxide and gold nanocatalysts (yAu/zMnO_x/3DOM SiO₂, y = 0-0.95 wt%; z = 2.7-15.4 wt% (weight percentage of Mn₂O₃)) were prepared using the polymethyl methacrylate-templating, incipient wetness impregnation, and polyvinyl alcohol-protected reduction methods, respectively. It is shown that the yAu/zMnO_x/3DOM SiO₂ samples displayed a high-quality 3DOM architecture with macropores (180-200 nm in diameter) and mesopores (4-6 nm in diameter) and a surface area of 220-318 m²/g. MnO_x nanoparticles (NPs) with a size of 18.7-25.7 nm were dispersed on the surface of 3DOM SiO₂, and Au NPs with a size of 3.6-3.8 nm were uniformly dispersed on the surface of zMnO_x/3DOM SiO₂. The 0.93Au/11.2MnO_x/3DOM SiO₂ sample performed the best (the temperature required for achieving a 90% toluene conversion was 255 °C at space velocity = 20,000 mL/(g h)) for toluene oxidation. It is concluded that the higher oxygen adspecies concentration, better low-temperature reducibility, and stronger interaction between Au and MnO_x NPs as well as the unique bimodal porous structure were responsible for the good catalytic performance of 0.93Au/11.2MnO_x/3DOM SiO₂.

Original language	English
Pages (from-to)	139-148
Number of pages	10
Journal	Applied Catalysis A: General
Volume	507
DOIs	https://doi.org/10.1016/j.apcata.2015.09.043
Publication status	Published - 25 Oct 2015

User-Defined Keywords

3DOM SiO-supported gold nanoparticle
3DOM SiO-supported manganese oxide and gold nanoparticle
Three-dimensionally ordered macro-/mesoporous
Toluene oxidation

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10.1016/j.apcata.2015.09.043

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@article{a371270c6100428e852d9ac38268249b,

title = "Au/MnOx/3DOM SiO2: Highly active catalysts for toluene oxidation",

abstract = "Three-dimensionally ordered macro-/mesoporous silica (3DOM SiO2)-supported manganese oxide and gold nanocatalysts (yAu/zMnOx/3DOM SiO2, y = 0-0.95 wt\%; z = 2.7-15.4 wt\% (weight percentage of Mn2O3)) were prepared using the polymethyl methacrylate-templating, incipient wetness impregnation, and polyvinyl alcohol-protected reduction methods, respectively. It is shown that the yAu/zMnOx/3DOM SiO2 samples displayed a high-quality 3DOM architecture with macropores (180-200 nm in diameter) and mesopores (4-6 nm in diameter) and a surface area of 220-318 m2/g. MnOx nanoparticles (NPs) with a size of 18.7-25.7 nm were dispersed on the surface of 3DOM SiO2, and Au NPs with a size of 3.6-3.8 nm were uniformly dispersed on the surface of zMnOx/3DOM SiO2. The 0.93Au/11.2MnOx/3DOM SiO2 sample performed the best (the temperature required for achieving a 90\% toluene conversion was 255 °C at space velocity = 20,000 mL/(g h)) for toluene oxidation. It is concluded that the higher oxygen adspecies concentration, better low-temperature reducibility, and stronger interaction between Au and MnOx NPs as well as the unique bimodal porous structure were responsible for the good catalytic performance of 0.93Au/11.2MnOx/3DOM SiO2.",

keywords = "3DOM SiO-supported gold nanoparticle, 3DOM SiO-supported manganese oxide and gold nanoparticle, Three-dimensionally ordered macro-/mesoporous, Toluene oxidation",

author = "Huanggen Yang and Jiguang Deng and Shaohua Xie and Yang Jiang and Hongxing Dai and Au, \{Chak Tong\}",

note = "Funding Information: This work was supported by the NSF of China (21377008), National High Technology Research and Development Program (“863” Program) of China (2015AA034603), Foundation on the Creative Research Team Construction Promotion Project of Beijing Municipal Institutions, and Scientific Research Base Construction–Science and Technology Creation Platform–National Materials Research Base Construction. ",

year = "2015",

month = oct,

day = "25",

doi = "10.1016/j.apcata.2015.09.043",

language = "English",

volume = "507",

pages = "139--148",

journal = "Applied Catalysis A: General",

issn = "0926-860X",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - Au/MnOx/3DOM SiO2

T2 - Highly active catalysts for toluene oxidation

AU - Yang, Huanggen

AU - Deng, Jiguang

AU - Xie, Shaohua

AU - Jiang, Yang

AU - Dai, Hongxing

AU - Au, Chak Tong

N1 - Funding Information: This work was supported by the NSF of China (21377008), National High Technology Research and Development Program (“863” Program) of China (2015AA034603), Foundation on the Creative Research Team Construction Promotion Project of Beijing Municipal Institutions, and Scientific Research Base Construction–Science and Technology Creation Platform–National Materials Research Base Construction.

PY - 2015/10/25

Y1 - 2015/10/25

N2 - Three-dimensionally ordered macro-/mesoporous silica (3DOM SiO2)-supported manganese oxide and gold nanocatalysts (yAu/zMnOx/3DOM SiO2, y = 0-0.95 wt%; z = 2.7-15.4 wt% (weight percentage of Mn2O3)) were prepared using the polymethyl methacrylate-templating, incipient wetness impregnation, and polyvinyl alcohol-protected reduction methods, respectively. It is shown that the yAu/zMnOx/3DOM SiO2 samples displayed a high-quality 3DOM architecture with macropores (180-200 nm in diameter) and mesopores (4-6 nm in diameter) and a surface area of 220-318 m2/g. MnOx nanoparticles (NPs) with a size of 18.7-25.7 nm were dispersed on the surface of 3DOM SiO2, and Au NPs with a size of 3.6-3.8 nm were uniformly dispersed on the surface of zMnOx/3DOM SiO2. The 0.93Au/11.2MnOx/3DOM SiO2 sample performed the best (the temperature required for achieving a 90% toluene conversion was 255 °C at space velocity = 20,000 mL/(g h)) for toluene oxidation. It is concluded that the higher oxygen adspecies concentration, better low-temperature reducibility, and stronger interaction between Au and MnOx NPs as well as the unique bimodal porous structure were responsible for the good catalytic performance of 0.93Au/11.2MnOx/3DOM SiO2.

AB - Three-dimensionally ordered macro-/mesoporous silica (3DOM SiO2)-supported manganese oxide and gold nanocatalysts (yAu/zMnOx/3DOM SiO2, y = 0-0.95 wt%; z = 2.7-15.4 wt% (weight percentage of Mn2O3)) were prepared using the polymethyl methacrylate-templating, incipient wetness impregnation, and polyvinyl alcohol-protected reduction methods, respectively. It is shown that the yAu/zMnOx/3DOM SiO2 samples displayed a high-quality 3DOM architecture with macropores (180-200 nm in diameter) and mesopores (4-6 nm in diameter) and a surface area of 220-318 m2/g. MnOx nanoparticles (NPs) with a size of 18.7-25.7 nm were dispersed on the surface of 3DOM SiO2, and Au NPs with a size of 3.6-3.8 nm were uniformly dispersed on the surface of zMnOx/3DOM SiO2. The 0.93Au/11.2MnOx/3DOM SiO2 sample performed the best (the temperature required for achieving a 90% toluene conversion was 255 °C at space velocity = 20,000 mL/(g h)) for toluene oxidation. It is concluded that the higher oxygen adspecies concentration, better low-temperature reducibility, and stronger interaction between Au and MnOx NPs as well as the unique bimodal porous structure were responsible for the good catalytic performance of 0.93Au/11.2MnOx/3DOM SiO2.

KW - 3DOM SiO-supported gold nanoparticle

KW - 3DOM SiO-supported manganese oxide and gold nanoparticle

KW - Three-dimensionally ordered macro-/mesoporous

KW - Toluene oxidation

UR - https://www.scopus.com/pages/publications/84944039613

U2 - 10.1016/j.apcata.2015.09.043

DO - 10.1016/j.apcata.2015.09.043

M3 - Journal article

AN - SCOPUS:84944039613

SN - 0926-860X

VL - 507

SP - 139

EP - 148

JO - Applied Catalysis A: General

JF - Applied Catalysis A: General

ER -

Au/MnO_x/3DOM SiO₂: Highly active catalysts for toluene oxidation

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