TY - JOUR
T1 - Preparation of carbon-supported Pt catalysts covered with microporous silica layers using organosilanes
T2 - Sintering resistance and superior catalytic performance for cyclohexane dehydrogenation
AU - Nakagawa, Keizo
AU - Okayama, Tetsuya
AU - Tanimoto, Yusuke
AU - Sotowa, Ken Ichiro
AU - Sugiyama, Shigeru
AU - Moriga, Toshihiro
AU - Takenaka, Sakae
AU - Kishida, Masahiro
N1 - Funding Information:
This work was funded by a Grant-in-Aid for JST Research for Promoting Technological Seeds (2008) and a Grant-in-Aid for Young Scientists (B) (no. 22760599 ) for the Ministry of Education, Culture, Sports, Science and Technology of Japan to KN. The authors gratefully acknowledge Dr. M. Tagami and Mr. T. Ueki (Center for Technical Support, Institute of Technology and Science, The University of Tokushima) for their assistance with the TEM experiments.
PY - 2012/3/29
Y1 - 2012/3/29
N2 - Carbon black-supported Pt metal particles (Pt/CB) were covered with microporous silica layers using different organosilanes like methyltriethoxysilane (MTES) (SiO 2(MTES)/Pt/CB) and phenyltriethoxysilane (PhTES) (SiO 2(PhTES)/Pt/CB). Pt metal particles in Pt/CB covered with microporous silica layers were stable at high temperature up to 973 K in a hydrogen atmosphere, because the microporous silica layers that wrapped around the Pt metal particles essentially prevent particle sintering. Methyl or phenyl groups were introduced into the silica layers that covered the Pt metal particles using MTES or PhTES hydrolysis. Micropores were formed in the silica layers effectively after thermal treatment at 973 K. The microporous silica-coated Pt catalysts were used as model catalysts for the dehydrogenation of cyclohexane. The microporous silica-coated Pt catalysts with thermal treatment at 973 K exhibited a higher conversion of cyclohexane compared with Pt/CB. Especially, the SiO 2(PhTES)/Pt/CB catalysts showed relatively higher conversion of cyclohexane compared with the other silica-coated Pt catalysts even when the SiO 2 loading was high. Microporous silica layers with a larger micropore volume promoted the diffusion of cyclohexane during the catalytic reaction.
AB - Carbon black-supported Pt metal particles (Pt/CB) were covered with microporous silica layers using different organosilanes like methyltriethoxysilane (MTES) (SiO 2(MTES)/Pt/CB) and phenyltriethoxysilane (PhTES) (SiO 2(PhTES)/Pt/CB). Pt metal particles in Pt/CB covered with microporous silica layers were stable at high temperature up to 973 K in a hydrogen atmosphere, because the microporous silica layers that wrapped around the Pt metal particles essentially prevent particle sintering. Methyl or phenyl groups were introduced into the silica layers that covered the Pt metal particles using MTES or PhTES hydrolysis. Micropores were formed in the silica layers effectively after thermal treatment at 973 K. The microporous silica-coated Pt catalysts were used as model catalysts for the dehydrogenation of cyclohexane. The microporous silica-coated Pt catalysts with thermal treatment at 973 K exhibited a higher conversion of cyclohexane compared with Pt/CB. Especially, the SiO 2(PhTES)/Pt/CB catalysts showed relatively higher conversion of cyclohexane compared with the other silica-coated Pt catalysts even when the SiO 2 loading was high. Microporous silica layers with a larger micropore volume promoted the diffusion of cyclohexane during the catalytic reaction.
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U2 - 10.1016/j.apcata.2011.12.020
DO - 10.1016/j.apcata.2011.12.020
M3 - Article
AN - SCOPUS:84857920194
SN - 0926-860X
VL - 419-420
SP - 13
EP - 21
JO - Applied Catalysis A: General
JF - Applied Catalysis A: General
ER -