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Self-Exfoliated Synthesis of Transition Metal Phosphate Nanolayers for Selective Aerobic Oxidation of Ethyl Lactate to Ethyl Pyruvate

[Image: see text] Two-dimensional (2D) transition metal nanosheets are promising catalysts because of the enhanced exposure of the active species compared to their 3D counterparts. Here, we report a simple, scalable, and reproducible strategy to prepare 2D phosphate nanosheets by forming a layered s...

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Autores principales: Zhang, Wei, Oulego, Paula, Sharma, Sandeep K., Yang, Xiu-Lin, Li, Lain-Jong, Rothenberg, Gadi, Shiju, N. Raveendran
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2020
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7493282/
https://www.ncbi.nlm.nih.gov/pubmed/32953234
http://dx.doi.org/10.1021/acscatal.9b04452
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author Zhang, Wei
Oulego, Paula
Sharma, Sandeep K.
Yang, Xiu-Lin
Li, Lain-Jong
Rothenberg, Gadi
Shiju, N. Raveendran
author_facet Zhang, Wei
Oulego, Paula
Sharma, Sandeep K.
Yang, Xiu-Lin
Li, Lain-Jong
Rothenberg, Gadi
Shiju, N. Raveendran
author_sort Zhang, Wei
collection PubMed
description [Image: see text] Two-dimensional (2D) transition metal nanosheets are promising catalysts because of the enhanced exposure of the active species compared to their 3D counterparts. Here, we report a simple, scalable, and reproducible strategy to prepare 2D phosphate nanosheets by forming a layered structure in situ from phytic acid (PTA) and transition metal precursors. Controlled combustion of the organic groups of PTA results in interlayer carbon, which keeps the layers apart during the formation of phosphate, and the removal of this carbon results in ultrathin nanosheets with controllable layers. Applying this concept to vanadyl phosphate synthesis, we show that the method yields 2D ultrathin nanosheets of the orthorhombic β-form, exposing abundant V(4+)/V(5+) redox sites and oxygen vacancies. We demonstrate the high catalytic activity of this material in the vapor-phase aerobic oxidation of ethyl lactate to ethyl pyruvate. Importantly, these β-VOPO(4) compounds do not get hydrated, thereby reducing the competing hydrolysis reaction by water byproducts. The result has superior selectivity to ethyl pyruvate compared to analogous vanadyl phosphates. The catalysts are highly stable, maintaining a steady-state conversion of ∼90% (with >80% selectivity) for at least 80 h on stream. This “self-exfoliated” synthesis protocol opens opportunities for preparing structurally diverse metal phosphates for catalysis and other applications.
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spelling pubmed-74932822020-09-16 Self-Exfoliated Synthesis of Transition Metal Phosphate Nanolayers for Selective Aerobic Oxidation of Ethyl Lactate to Ethyl Pyruvate Zhang, Wei Oulego, Paula Sharma, Sandeep K. Yang, Xiu-Lin Li, Lain-Jong Rothenberg, Gadi Shiju, N. Raveendran ACS Catal [Image: see text] Two-dimensional (2D) transition metal nanosheets are promising catalysts because of the enhanced exposure of the active species compared to their 3D counterparts. Here, we report a simple, scalable, and reproducible strategy to prepare 2D phosphate nanosheets by forming a layered structure in situ from phytic acid (PTA) and transition metal precursors. Controlled combustion of the organic groups of PTA results in interlayer carbon, which keeps the layers apart during the formation of phosphate, and the removal of this carbon results in ultrathin nanosheets with controllable layers. Applying this concept to vanadyl phosphate synthesis, we show that the method yields 2D ultrathin nanosheets of the orthorhombic β-form, exposing abundant V(4+)/V(5+) redox sites and oxygen vacancies. We demonstrate the high catalytic activity of this material in the vapor-phase aerobic oxidation of ethyl lactate to ethyl pyruvate. Importantly, these β-VOPO(4) compounds do not get hydrated, thereby reducing the competing hydrolysis reaction by water byproducts. The result has superior selectivity to ethyl pyruvate compared to analogous vanadyl phosphates. The catalysts are highly stable, maintaining a steady-state conversion of ∼90% (with >80% selectivity) for at least 80 h on stream. This “self-exfoliated” synthesis protocol opens opportunities for preparing structurally diverse metal phosphates for catalysis and other applications. American Chemical Society 2020-02-19 2020-04-03 /pmc/articles/PMC7493282/ /pubmed/32953234 http://dx.doi.org/10.1021/acscatal.9b04452 Text en Copyright © 2020 American Chemical Society This is an open access article published under a Creative Commons Non-Commercial No Derivative Works (CC-BY-NC-ND) Attribution License (http://pubs.acs.org/page/policy/authorchoice_ccbyncnd_termsofuse.html) , which permits copying and redistribution of the article, and creation of adaptations, all for non-commercial purposes.
spellingShingle Zhang, Wei
Oulego, Paula
Sharma, Sandeep K.
Yang, Xiu-Lin
Li, Lain-Jong
Rothenberg, Gadi
Shiju, N. Raveendran
Self-Exfoliated Synthesis of Transition Metal Phosphate Nanolayers for Selective Aerobic Oxidation of Ethyl Lactate to Ethyl Pyruvate
title Self-Exfoliated Synthesis of Transition Metal Phosphate Nanolayers for Selective Aerobic Oxidation of Ethyl Lactate to Ethyl Pyruvate
title_full Self-Exfoliated Synthesis of Transition Metal Phosphate Nanolayers for Selective Aerobic Oxidation of Ethyl Lactate to Ethyl Pyruvate
title_fullStr Self-Exfoliated Synthesis of Transition Metal Phosphate Nanolayers for Selective Aerobic Oxidation of Ethyl Lactate to Ethyl Pyruvate
title_full_unstemmed Self-Exfoliated Synthesis of Transition Metal Phosphate Nanolayers for Selective Aerobic Oxidation of Ethyl Lactate to Ethyl Pyruvate
title_short Self-Exfoliated Synthesis of Transition Metal Phosphate Nanolayers for Selective Aerobic Oxidation of Ethyl Lactate to Ethyl Pyruvate
title_sort self-exfoliated synthesis of transition metal phosphate nanolayers for selective aerobic oxidation of ethyl lactate to ethyl pyruvate
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7493282/
https://www.ncbi.nlm.nih.gov/pubmed/32953234
http://dx.doi.org/10.1021/acscatal.9b04452
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