TY - JOUR
T1 - Cerium-incorporated cage-type mesoporous KIT-6 materials
T2 - Synthesis, characterization and catalytic applications
AU - Prabhu, Azhagapillai
AU - Kumaresan, Loganathan
AU - Palanichamy, Muthaiahpillai
AU - Murugesan, Velayutham
N1 - Funding Information:
The authors acknowledge University Grants Commission (UGC), New Delhi for providing funds under special assistance-DRS programme and Department of Science and Technology (DST), New Delhi, under FIST programme for equipment facilities in the Department. One of the authors, L. Kumaresan is thankful to CSIR, New Delhi, for the award of a senior research fellow grant (SRF).
PY - 2010/2/1
Y1 - 2010/2/1
N2 - Ce-KIT-6 with Si/Ce = 5, 10, 20, 50, 100 and 150 mesoporous molecular sieves were successfully synthesized by a hydrothermal method. The synthesized materials were characterized extensively to understand the physico-chemical properties of the materials. The low-angle powder XRD patterns of calcined Ce-KIT-6 material showed a phase that can be indexed to cubic Ia3d. The UV-vis spectra of Ce-KIT-6 samples exhibited two distinct bands with maxima at 265 and 300 nm due to charge transfer to Ce3+ and Ce4+ respectively. Their intensity increased with increase in the Ce content of the samples. The BET surface area was found to be in the range of 668.4-836.9 m2/g. HR-TEM images revealed well-ordered cubic 3-D mesoporous channels. The catalytic activity was tested in the liquid phase oxidation of cyclohexane with hydrogen peroxide. Cyclohexanol was found to be the major product. Ce-KIT-6 (5) gave 74% cyclohexane conversion, which is higher than other catalysts. Ce4+ is suggested to activate hydrogen peroxide by coordination to oxidise cyclohexane.
AB - Ce-KIT-6 with Si/Ce = 5, 10, 20, 50, 100 and 150 mesoporous molecular sieves were successfully synthesized by a hydrothermal method. The synthesized materials were characterized extensively to understand the physico-chemical properties of the materials. The low-angle powder XRD patterns of calcined Ce-KIT-6 material showed a phase that can be indexed to cubic Ia3d. The UV-vis spectra of Ce-KIT-6 samples exhibited two distinct bands with maxima at 265 and 300 nm due to charge transfer to Ce3+ and Ce4+ respectively. Their intensity increased with increase in the Ce content of the samples. The BET surface area was found to be in the range of 668.4-836.9 m2/g. HR-TEM images revealed well-ordered cubic 3-D mesoporous channels. The catalytic activity was tested in the liquid phase oxidation of cyclohexane with hydrogen peroxide. Cyclohexanol was found to be the major product. Ce-KIT-6 (5) gave 74% cyclohexane conversion, which is higher than other catalysts. Ce4+ is suggested to activate hydrogen peroxide by coordination to oxidise cyclohexane.
KW - Cage-type materials
KW - Ce-KIT-6
KW - Cyclohexane
KW - Cyclohexanol
KW - Cyclohexanone
KW - Hydrogen peroxide
KW - Oxidation
UR - http://www.scopus.com/inward/record.url?scp=74049107237&partnerID=8YFLogxK
U2 - 10.1016/j.apcata.2009.11.016
DO - 10.1016/j.apcata.2009.11.016
M3 - Article
AN - SCOPUS:74049107237
SN - 0926-860X
VL - 374
SP - 11
EP - 17
JO - Applied Catalysis A: General
JF - Applied Catalysis A: General
IS - 1-2
ER -