Hierarchical hollow nickel silicate microflowers for selective oxidation of styrene

Liu, Jiangyong; Chen, Tingting; Jian, Panming; Wang, Lixia

doi:10.1016/j.jcis.2019.06.042

Cited by 24 publications

(11 citation statements)

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“…For all of the samples, the presence of hysteresis loops indicates their mesoporous character . Based on these N 2 sorption isotherms, the surface areas ( S BET ), pore volumes ( V p ), and mean pore diameters ( D p ) can be determined by applying the Brunauer–Emmett–Teller (BET) and Barrett–Joyner–Halenda (BJH) methods . As listed in Table , the S BET values of the series of binary oxides locate between those of pure Co 3 O 4 (11.3 m 2 g –1 ) and CeO 2 (58.5 m 2 g –1 ), which can be due to the decreased Co 3 O 4 particle size and the generation of interfaces by the cooperation of CeO 2 .…”

Section: Resultsmentioning

confidence: 99%

“…36 Based on these N 2 sorption isotherms, the surface areas (S BET ), pore volumes (V p ), and mean pore diameters (D p ) can be determined by applying the Brunauer−Emmett−Teller (BET) and Barrett−Joyner−Halenda (BJH) methods. 37 As listed in Table 1, the S BET values of the series of binary oxides locate between those of pure Co 3 O 4 (11.3 m 2 g −1 ) and CeO 2 (58.5 m 2 g −1 ), which can be due to 35 Further information about the Co 3 O 4 −CeO 2 interaction and the surface chemistry of the samples can be analyzed by the XPS technique. 38,39 As presented in Figure 5a, for all of the CeO 2 /Co 3 O 4 catalysts, only three elements Ce, Co, and O can be identified.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

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CeO₂ Nanoparticle-Decorated Co₃O₄ Microspheres for Selective Oxidation of Ethylbenzene with Molecular Oxygen under Solvent- and Additive-Free Conditions

Liu

Meng

Jian

et al. 2020

ACS Sustainable Chem. Eng.

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An ideal catalytic process for the selective oxidation of hydrocarbons should employ an efficient, recyclable, and cost-effective catalyst under solvent- and additive-free conditions with molecular oxygen as the only oxidant. This is an important goal in the catalysis community and remains a significant challenge. In this respect, we report the facile construction of a series of uniform CeO2 nanoparticle-decorated Co3O4 microspheres (CeO2/Co3O4) for the selective ethylbenzene oxidation reaction by molecular oxygen. Among the catalysts with various CeO2 loading levels, CeO2/Co3O4-3 (5 wt % loading of CeO2) obtained by careful composition modulation exhibits the optimum reaction performance, with ethylbenzene conversion of 73.4% accompanied by a selectivity of 78.5% to acetophenone. The yield of acetophenone can achieve 57.6%, while the reaction rate can reach up to 401.3 mmol gcat –1 h–1. In addition, CeO2/Co3O4-3 presents robust stability and good recycling performance. The tailored CeO2/Co3O4-3 catalyst is superior to the reported catalysts, and it is the state-of-the-art catalyst under the current challenging reaction system. Experimental evidence and mechanism analysis suggest that the interface synergy featured with −Ce–OV–Co– active sites derived from the intimate connection between the two oxides is the dominant contributor in boosting the catalytic performance. This work can reinvigorate research into the exploitation of catalysts for the sustainable and green catalytic oxidation of ethylbenzene and beyond.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Experimental Sectionmentioning

confidence: 99%

CeO₂ Nanoparticle-Decorated Co₃O₄ Microspheres for Selective Oxidation of Ethylbenzene with Molecular Oxygen under Solvent- and Additive-Free Conditions

Liu

Meng

Jian

et al. 2020

ACS Sustainable Chem. Eng.

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“…In several works and adopting the same sacrificial strategy, synthesis of the nickel silicate was reported using SiO 2 spheres, similar to the scheme shown in Figure B . In most cases, a hollow nanocomposite (Ni NPs/SiO 2 ) can be obtained with ultrafine Ni NPs (∼3–10 nm) segregatively grown on SiO 2 support via reduction of the as‐synthesized nickel silicate shell in H 2 atmosphere.…”

Section: Transformation Of Stöber Silica Spheres To Hollow Nanocatalystsmentioning

confidence: 96%

“…In most cases, a hollow nanocomposite (Ni NPs/SiO 2 ) can be obtained with ultrafine Ni NPs (∼3–10 nm) segregatively grown on SiO 2 support via reduction of the as‐synthesized nickel silicate shell in H 2 atmosphere. Such Ni/SiO 2 nanocomposite was reported for high‐performance lithium storage, selective oxidation of styrene, CO 2 dry reforming of CH 4 (DRM reaction), and nitrobenzene hydrogenation . One can also coat an additional layer of mesoporous silica shell on the periphery of the nickel silicate hollow spheres prior to hydrogen‐reduction .…”

Section: Transformation Of Stöber Silica Spheres To Hollow Nanocatalystsmentioning

confidence: 99%

Transformation of Stöber Silica Spheres to Hollow Nanocatalysts

2020

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The discovery of silica spheres by Werner Stöber and his team (known as Stöber silica) has been instrumental to many technological fields such as hollow materials research. Recent research endeavors on (physical and chemical) transformation of Stöber silica have specifically opened up a new horizon in this domain, especially in catalysis science and catalyst technology. Deliberate introduction of working spaces into Stöber silica via such transformations is regarded as a meaningful methodology toward fabrication of highly confined hollow nanostructures in the form of “reactor‐like nanocatalysts” or “catalyst‐like nanoreactors”. More importantly, advanced catalytic devices with well‐defined size, shape, composition, and hollowness could be obtained by these viable approaches. Concerning the further research, the present minireview gives an overview on recent advances about the synthesis and applications of hollow nanocatalysts derived from Stöber silica spheres. Firstly, we will provide the gist of current status of hollow materials research. Secondly, applicable methods for transformation of Stöber silica spheres to hollow nanostructures and hollow nanocatalysts will be elaborated. The stability and durability of SiO2‐based hollow constructs will also be elucidated. Subsequently, research snapshots of Stöber SiO2‐derived hollow nanostructures and their applicability mainly for catalytic purposes, from our research group and literature, will be discussed. Our personal perspectives on promising research opportunities and challenges in this field will also be given at the end.

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“…Interestingly, the catalyst was utilized without calcination, which was always required in previously reported catalysts. [35][36][37] Au NCs were successfully synthesized in the pores of MSNs via wet chemical reduction of impregnated gold precursors. For this, amination of MSNs was carried out before introducing an Au precursor to facilitate electrostatic interaction between the MSNs and the added gold precursor ions.…”

Section: Tem Images Show a Uniform Distribution Of Monodisperse Ncs Wmentioning

confidence: 99%

Ligand-free gold nanoclusters confined in mesoporous silica nanoparticles for styrene epoxidation

et al. 2020

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Hierarchical hollow nickel silicate microflowers for selective oxidation of styrene

Cited by 24 publications

References 50 publications

CeO₂ Nanoparticle-Decorated Co₃O₄ Microspheres for Selective Oxidation of Ethylbenzene with Molecular Oxygen under Solvent- and Additive-Free Conditions

CeO₂ Nanoparticle-Decorated Co₃O₄ Microspheres for Selective Oxidation of Ethylbenzene with Molecular Oxygen under Solvent- and Additive-Free Conditions

Transformation of Stöber Silica Spheres to Hollow Nanocatalysts

Ligand-free gold nanoclusters confined in mesoporous silica nanoparticles for styrene epoxidation

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Hierarchical hollow nickel silicate microflowers for selective oxidation of styrene

Cited by 24 publications

References 50 publications

CeO2 Nanoparticle-Decorated Co3O4 Microspheres for Selective Oxidation of Ethylbenzene with Molecular Oxygen under Solvent- and Additive-Free Conditions

CeO2 Nanoparticle-Decorated Co3O4 Microspheres for Selective Oxidation of Ethylbenzene with Molecular Oxygen under Solvent- and Additive-Free Conditions

Transformation of Stöber Silica Spheres to Hollow Nanocatalysts

Ligand-free gold nanoclusters confined in mesoporous silica nanoparticles for styrene epoxidation

Contact Info

Product

Resources

About

CeO₂ Nanoparticle-Decorated Co₃O₄ Microspheres for Selective Oxidation of Ethylbenzene with Molecular Oxygen under Solvent- and Additive-Free Conditions

CeO₂ Nanoparticle-Decorated Co₃O₄ Microspheres for Selective Oxidation of Ethylbenzene with Molecular Oxygen under Solvent- and Additive-Free Conditions