Self-Templating Synthesis of 3D Hierarchical NiCo<sub>2</sub>O<sub>4</sub>@NiO Nanocage from Hydrotalcites for Toluene Oxidation

Self-Templating Synthesis of 3D Hierarchical NiCo<sub>2</sub>O<sub>4</sub>@NiO Nanocage from Hydrotalcites for Toluene Oxidation

Rational design LDHs (layered double hydroxides) with 3D hierarchical hollow structures have generated widespread interest for catalytic oxidation due to the high complexity in shell architecture and composition. Herein, we reported a handy two-step method to construct a 3D hierarchical NiCo<sub&...

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Main Authors: Dongdong Wang, Shuangde Li, Yingchao Du, Xiaofeng Wu, Yunfa Chen
Format: Article
Language:English
Published: MDPI AG 2019-04-01
Series:Catalysts
Subjects:
hierarchical nanocage
high surface area
toluene oxidation
lattice defect
Online Access:https://www.mdpi.com/2073-4344/9/4/352
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spelling doaj-67e278c49c7a4c5cb19f156d1cf1793a2020-11-24T22:15:48ZengMDPI AGCatalysts2073-43442019-04-019435210.3390/catal9040352catal9040352Self-Templating Synthesis of 3D Hierarchical NiCo<sub>2</sub>O<sub>4</sub>@NiO Nanocage from Hydrotalcites for Toluene OxidationDongdong Wang0Shuangde Li1Yingchao Du2Xiaofeng Wu3Yunfa Chen4State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, ChinaState Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, ChinaState Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, ChinaState Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, ChinaState Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, ChinaRational design LDHs (layered double hydroxides) with 3D hierarchical hollow structures have generated widespread interest for catalytic oxidation due to the high complexity in shell architecture and composition. Herein, we reported a handy two-step method to construct a 3D hierarchical NiCo<sub>2</sub>O<sub>4</sub>/NiO nanocage. This synthetic strategy contains a partial in situ transformation of ZIF-67 (zeolitic imidazolate framework-67) into Co-NiLDH yolk-shelled structures following ethanol etching, and a structure-preserved transformation from Co-NiLDH@ZIF-67 to a biphase nanocage following calcination. CoNi-yh-T (varied reaction time and calcination temperature) nanocages were investigated systematically by Brunauer&#8211;Emmett&#8211;Teller (BET), X-ray photoelectron spectroscopy (XPS), H<sub>2</sub>- temperature-programmed reduction (TPR), NH<sub>3</sub>-temperature-programmed desorption (TPD) and studied for toluene oxidation. The CoNi-6h-350 sample showed much higher activity with 90% toluene conversion (T<sub>90</sub>) at 229 &#176;C at a high space velocity (SV = 60,000 mL g<sup>&#8722;1</sup> h<sup>&#8722;1</sup>) than other catalysts (T<sub>90</sub> &gt;240 &#176;C). Abundant surface high valence Co ions caused by the novel hierarchical nanostructures, together with adsorbed oxygen species and abundant medium-strength surface acid sites, played a key role for catalytic activities.https://www.mdpi.com/2073-4344/9/4/352hierarchical nanocagehigh surface areatoluene oxidationlattice defect
collection DOAJ
language English
format Article
sources DOAJ
author Dongdong Wang
Shuangde Li
Yingchao Du
Xiaofeng Wu
Yunfa Chen
spellingShingle Dongdong Wang
Shuangde Li
Yingchao Du
Xiaofeng Wu
Yunfa Chen
Self-Templating Synthesis of 3D Hierarchical NiCo<sub>2</sub>O<sub>4</sub>@NiO Nanocage from Hydrotalcites for Toluene Oxidation
Catalysts
hierarchical nanocage
high surface area
toluene oxidation
lattice defect
author_facet Dongdong Wang
Shuangde Li
Yingchao Du
Xiaofeng Wu
Yunfa Chen
author_sort Dongdong Wang
title Self-Templating Synthesis of 3D Hierarchical NiCo<sub>2</sub>O<sub>4</sub>@NiO Nanocage from Hydrotalcites for Toluene Oxidation
title_short Self-Templating Synthesis of 3D Hierarchical NiCo<sub>2</sub>O<sub>4</sub>@NiO Nanocage from Hydrotalcites for Toluene Oxidation
title_full Self-Templating Synthesis of 3D Hierarchical NiCo<sub>2</sub>O<sub>4</sub>@NiO Nanocage from Hydrotalcites for Toluene Oxidation
title_fullStr Self-Templating Synthesis of 3D Hierarchical NiCo<sub>2</sub>O<sub>4</sub>@NiO Nanocage from Hydrotalcites for Toluene Oxidation
title_full_unstemmed Self-Templating Synthesis of 3D Hierarchical NiCo<sub>2</sub>O<sub>4</sub>@NiO Nanocage from Hydrotalcites for Toluene Oxidation
title_sort self-templating synthesis of 3d hierarchical nico<sub>2</sub>o<sub>4</sub>@nio nanocage from hydrotalcites for toluene oxidation
publisher MDPI AG
series Catalysts
issn 2073-4344
publishDate 2019-04-01
description Rational design LDHs (layered double hydroxides) with 3D hierarchical hollow structures have generated widespread interest for catalytic oxidation due to the high complexity in shell architecture and composition. Herein, we reported a handy two-step method to construct a 3D hierarchical NiCo<sub>2</sub>O<sub>4</sub>/NiO nanocage. This synthetic strategy contains a partial in situ transformation of ZIF-67 (zeolitic imidazolate framework-67) into Co-NiLDH yolk-shelled structures following ethanol etching, and a structure-preserved transformation from Co-NiLDH@ZIF-67 to a biphase nanocage following calcination. CoNi-yh-T (varied reaction time and calcination temperature) nanocages were investigated systematically by Brunauer&#8211;Emmett&#8211;Teller (BET), X-ray photoelectron spectroscopy (XPS), H<sub>2</sub>- temperature-programmed reduction (TPR), NH<sub>3</sub>-temperature-programmed desorption (TPD) and studied for toluene oxidation. The CoNi-6h-350 sample showed much higher activity with 90% toluene conversion (T<sub>90</sub>) at 229 &#176;C at a high space velocity (SV = 60,000 mL g<sup>&#8722;1</sup> h<sup>&#8722;1</sup>) than other catalysts (T<sub>90</sub> &gt;240 &#176;C). Abundant surface high valence Co ions caused by the novel hierarchical nanostructures, together with adsorbed oxygen species and abundant medium-strength surface acid sites, played a key role for catalytic activities.
topic hierarchical nanocage
high surface area
toluene oxidation
lattice defect
url https://www.mdpi.com/2073-4344/9/4/352
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