Au/MnOx/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

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)139-148
Number of pages10
JournalApplied Catalysis A: General
Volume507
DOIs
Publication statusPublished - 25 Oct 2015

Scopus Subject Areas

  • Catalysis
  • Process Chemistry and Technology

User-Defined Keywords

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

Fingerprint

Dive into the research topics of 'Au/MnO<sub>x</sub>/3DOM SiO<sub>2</sub>: Highly active catalysts for toluene oxidation'. Together they form a unique fingerprint.

Cite this