Engineering zirconium-based UiO-66 for effective chemical conversion of -xylose to lactic acid in aqueous condition
Utilizing metal-organic frameworks (MOFs) as heterogeneous catalysts is an interesting and important application due to their well-controlled catalytic sites and well-defined porous structures. In this study we apply, for the first time, Zr-based UiO-66 for the catalytic hydrothermal conversion of d...
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Published in | Chemical communications (Cambridge, England) Vol. 56; no. 58; pp. 819 - 822 |
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Main Authors | , , , , , , , |
Format | Journal Article |
Language | English |
Published |
21.07.2020
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Online Access | Get full text |
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Abstract | Utilizing metal-organic frameworks (MOFs) as heterogeneous catalysts is an interesting and important application due to their well-controlled catalytic sites and well-defined porous structures. In this study we apply, for the first time, Zr-based UiO-66 for the catalytic hydrothermal conversion of
d
-xylose to lactic acid (LA). The reactions are catalyzed by the coordinatively unsaturated Zr
4+
, as Lewis acid sites, and the hydroxide ion (OH
−
) located at the defect sites. The catalytic performances of UiO-66 catalysts synthesized through a modulator-free approach (UiO-66) and an acetic acid modulator-assisted approach (UiO-66(AA)) are distinct due to the different concentrations of local defects. The UiO-66 catalyst possessing a higher defect concentration exhibits a superior LA yield of 1.17 mol from 1 mol of xylose. However, the UiO-66(AA) catalyst with higher crystallinity shows better selectivity for LA over furfural, a side product from the competitive pathway. The enhanced LA yield and excellent selectivity can be achieved by the removal of AA from UiO-66(AA) resulting in a novel MOF catalyst (UiO-66(AA)*) which provides more accessible catalytic sites with retained crystallinity. This work highlights that the structural engineering of MOF catalysts is crucial for the fine-tuning of their catalytic properties.
Local defects and crystallinity of UiO-66 were systematically engineered, yielding an effective catalyst for lactic acid production from
d
-xylose
via
a hydrothermal reaction. |
---|---|
AbstractList | Utilizing metal-organic frameworks (MOFs) as heterogeneous catalysts is an interesting and important application due to their well-controlled catalytic sites and well-defined porous structures. In this study we apply, for the first time, Zr-based UiO-66 for the catalytic hydrothermal conversion of
d
-xylose to lactic acid (LA). The reactions are catalyzed by the coordinatively unsaturated Zr
4+
, as Lewis acid sites, and the hydroxide ion (OH
−
) located at the defect sites. The catalytic performances of UiO-66 catalysts synthesized through a modulator-free approach (UiO-66) and an acetic acid modulator-assisted approach (UiO-66(AA)) are distinct due to the different concentrations of local defects. The UiO-66 catalyst possessing a higher defect concentration exhibits a superior LA yield of 1.17 mol from 1 mol of xylose. However, the UiO-66(AA) catalyst with higher crystallinity shows better selectivity for LA over furfural, a side product from the competitive pathway. The enhanced LA yield and excellent selectivity can be achieved by the removal of AA from UiO-66(AA) resulting in a novel MOF catalyst (UiO-66(AA)*) which provides more accessible catalytic sites with retained crystallinity. This work highlights that the structural engineering of MOF catalysts is crucial for the fine-tuning of their catalytic properties.
Local defects and crystallinity of UiO-66 were systematically engineered, yielding an effective catalyst for lactic acid production from
d
-xylose
via
a hydrothermal reaction. |
Author | Bureekaew, Sareeya Ponchai, Panyapat Siwaipram, Siwarut Faungnawakij, Kajornsak Adpakpang, Kanyaporn Thongratkaew, Sutarat Chaipojjana, Kawisa Wannapaiboon, Suttipong |
AuthorAffiliation | National Nanotechnology Center (NANOTEC) Research Network of NANOTEC-VISTEC on Nanotechnology for Energy School of Energy Science and Engineering Synchrotron Light Research Institute National Science and Technology Development Agency (NSTDA) Vidyasirimedhi Institute of Science and Technology |
AuthorAffiliation_xml | – name: Research Network of NANOTEC-VISTEC on Nanotechnology for Energy – name: National Science and Technology Development Agency (NSTDA) – name: Synchrotron Light Research Institute – name: School of Energy Science and Engineering – name: National Nanotechnology Center (NANOTEC) – name: Vidyasirimedhi Institute of Science and Technology |
Author_xml | – sequence: 1 givenname: Panyapat surname: Ponchai fullname: Ponchai, Panyapat – sequence: 2 givenname: Kanyaporn surname: Adpakpang fullname: Adpakpang, Kanyaporn – sequence: 3 givenname: Sutarat surname: Thongratkaew fullname: Thongratkaew, Sutarat – sequence: 4 givenname: Kawisa surname: Chaipojjana fullname: Chaipojjana, Kawisa – sequence: 5 givenname: Suttipong surname: Wannapaiboon fullname: Wannapaiboon, Suttipong – sequence: 6 givenname: Siwarut surname: Siwaipram fullname: Siwaipram, Siwarut – sequence: 7 givenname: Kajornsak surname: Faungnawakij fullname: Faungnawakij, Kajornsak – sequence: 8 givenname: Sareeya surname: Bureekaew fullname: Bureekaew, Sareeya |
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