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 - http://www.scopus.com/inward/record.url?scp=84944039613&partnerID=8YFLogxK
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 -