A novel strategy for constructing mesoporous solid superbase catalysts: bimetallic Al-La oxides supported on SBA-15 modified with KFElectronic supplementary information (ESI) available. See DOI: 10.1039/c6cy02334g
Bimetallic Al-La oxides were conjointly precoated on SBA-15 prior to the introduction of potassium fluoride to achieve solid superbases at low temperature by a modified wetness impregnation method. This breaks the tradition of decomposition of KNO 3 at high temperature and gives rise to a new approa...
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Format | Journal Article |
Language | English |
Published |
07.02.2017
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Abstract | Bimetallic Al-La oxides were conjointly precoated on SBA-15 prior to the introduction of potassium fluoride to achieve solid superbases at low temperature by a modified wetness impregnation method. This breaks the tradition of decomposition of KNO
3
at high temperature and gives rise to a new approach to generating superbasic sites on SBA-15. The physico-chemical characteristics of the prepared KF/Al-La@SBA-15 materials were investigated using FT-IR, XRD, TG-DTG, N
2
adsorption-desorption, TEM, SEM-EDS, acid-base titration, Hammett indicators and CO
2
-TPD measurements. The results demonstrated that the addition of Al species promoted the dispersion behavior of La species inside the channels, and the bimetallic species could synergistically protect the mesoporous structures of SBA-15 against KF corrosion. With increasing Al content, KF/Al-La@SBA-15 exhibited a long-range ordering of the pores with relatively narrow pore size distribution as well as high specific surface area. The research results showed that the KF/Al-La@SBA-15 (0.4) catalyst possessed a total basicity up to 0.79 mmol g
−1
and superbasicity with a strength of 26.5. The catalytic activity of the prepared materials was evaluated in the ring-opening reaction of propylene oxide with methanol. Compared with the SBA-15 supported monometallic oxide (Al or La) catalysts, KF/Al-La@SBA-15 (0.4) exhibited the highest catalytic activity for the ring-opening reaction of propylene oxide with methanol. This is associated with the synergistic effects between Al and La species and the high dispersion of active components on the SBA-15 support.
Bimetallic Al-La oxides were conjointly precoated on SBA-15 prior to the introduction of potassium fluoride to achieve solid superbases at low temperature by a modified wetness impregnation method. |
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AbstractList | Bimetallic Al-La oxides were conjointly precoated on SBA-15 prior to the introduction of potassium fluoride to achieve solid superbases at low temperature by a modified wetness impregnation method. This breaks the tradition of decomposition of KNO
3
at high temperature and gives rise to a new approach to generating superbasic sites on SBA-15. The physico-chemical characteristics of the prepared KF/Al-La@SBA-15 materials were investigated using FT-IR, XRD, TG-DTG, N
2
adsorption-desorption, TEM, SEM-EDS, acid-base titration, Hammett indicators and CO
2
-TPD measurements. The results demonstrated that the addition of Al species promoted the dispersion behavior of La species inside the channels, and the bimetallic species could synergistically protect the mesoporous structures of SBA-15 against KF corrosion. With increasing Al content, KF/Al-La@SBA-15 exhibited a long-range ordering of the pores with relatively narrow pore size distribution as well as high specific surface area. The research results showed that the KF/Al-La@SBA-15 (0.4) catalyst possessed a total basicity up to 0.79 mmol g
−1
and superbasicity with a strength of 26.5. The catalytic activity of the prepared materials was evaluated in the ring-opening reaction of propylene oxide with methanol. Compared with the SBA-15 supported monometallic oxide (Al or La) catalysts, KF/Al-La@SBA-15 (0.4) exhibited the highest catalytic activity for the ring-opening reaction of propylene oxide with methanol. This is associated with the synergistic effects between Al and La species and the high dispersion of active components on the SBA-15 support.
Bimetallic Al-La oxides were conjointly precoated on SBA-15 prior to the introduction of potassium fluoride to achieve solid superbases at low temperature by a modified wetness impregnation method. |
Author | Liu, Ning Yu, Rongdong Pan, Langsheng Li, Meng Liu, Yuejin Li, Yongfei Li, Shanshan Wu, Zhimin |
AuthorAffiliation | School of Chemical Engineering University of Massachusetts Amherst Xiangtan University National & Local United Engineering Research Centre for Chemical Process Simulation and Intensification Department of Chemical Engineering |
AuthorAffiliation_xml | – name: Department of Chemical Engineering – name: University of Massachusetts Amherst – name: School of Chemical Engineering – name: National & Local United Engineering Research Centre for Chemical Process Simulation and Intensification – name: Xiangtan University |
Author_xml | – sequence: 1 givenname: Ning surname: Liu fullname: Liu, Ning – sequence: 2 givenname: Zhimin surname: Wu fullname: Wu, Zhimin – sequence: 3 givenname: Meng surname: Li fullname: Li, Meng – sequence: 4 givenname: Shanshan surname: Li fullname: Li, Shanshan – sequence: 5 givenname: Yongfei surname: Li fullname: Li, Yongfei – sequence: 6 givenname: Rongdong surname: Yu fullname: Yu, Rongdong – sequence: 7 givenname: Langsheng surname: Pan fullname: Pan, Langsheng – sequence: 8 givenname: Yuejin surname: Liu fullname: Liu, Yuejin |
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Title | A novel strategy for constructing mesoporous solid superbase catalysts: bimetallic Al-La oxides supported on SBA-15 modified with KFElectronic supplementary information (ESI) available. See DOI: 10.1039/c6cy02334g |
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