Cerium-incorporated cage-type mesoporous KIT-6 materials: Synthesis, characterization and catalytic applications

Azhagapillai Prabhu; Loganathan Kumaresan; Muthaiahpillai Palanichamy; Velayutham Murugesan

doi:10.1016/j.apcata.2009.11.016

Cerium-incorporated cage-type mesoporous KIT-6 materials: Synthesis, characterization and catalytic applications

Azhagapillai Prabhu
, Loganathan Kumaresan
, Muthaiahpillai Palanichamy
, Velayutham Murugesan

Anna University

Research output: Contribution to journal › Article › peer-review

33 Scopus citations

Abstract

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.

Original language	British English
Pages (from-to)	11-17
Number of pages	7
Journal	Applied Catalysis A: General
Volume	374
Issue number	1-2
DOIs	https://doi.org/10.1016/j.apcata.2009.11.016
State	Published - 1 Feb 2010

Keywords

Cage-type materials
Ce-KIT-6
Cyclohexane
Cyclohexanol
Cyclohexanone
Hydrogen peroxide
Oxidation

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title = "Cerium-incorporated cage-type mesoporous KIT-6 materials: Synthesis, characterization and catalytic applications",

abstract = "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.",

keywords = "Cage-type materials, Ce-KIT-6, Cyclohexane, Cyclohexanol, Cyclohexanone, Hydrogen peroxide, Oxidation",

author = "Azhagapillai Prabhu and Loganathan Kumaresan and Muthaiahpillai Palanichamy and Velayutham Murugesan",

note = "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).",

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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).

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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.

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KW - Cyclohexanol

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Cerium-incorporated cage-type mesoporous KIT-6 materials: Synthesis, characterization and catalytic applications

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Keywords

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