Solution combustion derived oxygen vacancy-rich Co<sub>3</sub>O<sub>4</sub> catalysts for catalytic formaldehyde oxidation at room temperature

Mu, Baolin; Zhang, Xianjuan; Zhang, Yexin; Lu, Peng; Hao, Jianyuan; Zhang, Jian

doi:10.1039/d2ra00783e

Cited by 8 publications

(6 citation statements)

References 31 publications

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“…Co 3 O 4 nanoparticles were prepared based on a previously reported method. , Co (NO 3 ) 2 ·6H 2 O was first placed in a quartz boat and calcined at 500 °C at a heating rate of 5 °C min –1 for 5 h in a muffle. The resultant Co 3 O 4 (about 30 nm) was then used as a carrier to load Ru by the impregnation method.…”

Section: Experimental Sectionmentioning

confidence: 99%

Coproduction of Glyceric Acid and Glycolic Acid from Biomass-Based Sugars over a Ru/Co₃O₄ Catalyst

Liu,

Zhou,

Wang

et al. 2024

ACS Catal.

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α-Hydroxyl acid production from biomass has emerged as a promising approach for biomass valorization but remains a long-standing challenge due to limited productivity. Herein, we established an innovative strategy for the coproduction of glyceric and glycolic acids from pentose feedstocks. Ru/Co 3 O 4 catalyst, possessing tunable Ru n+ /Ru 0 ratio and abundant oxygen vacancy, was found to promote the total yield of glyceric acid and glycolic acid (up to 65.9 C-mol % with a ∼1:1 molar ratio based on the initial carbon in the feedstock, the highest value among the state-of-the-art advances) at a mild temperature (70 °C). The results of the isotopic tracing experiments confirmed that xylose underwent C2−C3 cleavage, yielding glyceraldehyde and glycolaldehyde intermediates, which could be oxidized to produce glyceric acid and glycolic acid, respectively. In combination with density functional theory (DFT) calculations, it was revealed that Ru n+ and Ru 0 with an appropriate Ru n+ /Ru 0 ratio, in addition to oxygen vacancies, made a pronounced cooperative contribution to achieve complicated cascade reactions. Ru n+ was proven to be more favorable for xylose adsorption via the interaction with the −C�O, thereby accelerating the ring-opening reaction and C2−C3 cleavage, while Ru 0 , together with oxygen vacancies, mainly contributed to the activation of O 2 to produce active oxygen species that facilitated the immediate oxidation of intermediates. The results of this work may provide useful insights into catalyst design and potential directions to maximize carbon utilization in biomass valorization.

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Section: Experimental Sectionmentioning

confidence: 99%

Coproduction of Glyceric Acid and Glycolic Acid from Biomass-Based Sugars over a Ru/Co₃O₄ Catalyst

Liu,

Zhou,

Wang

et al. 2024

ACS Catal.

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“…The catalysts featured a porous network structure with abundant oxygen vacancies and nanopores, enhancing catalytic performance. [22] Han et al successfully synthesized Co 3 O 4 catalysts from metal-organic frameworks (MOFs), showcasing a large specific surface area, high redox capacity, abundant active centers, and substantial adsorbed oxygen. This led to exemplary toluene combustion performance.…”

Section: Structure Constructionmentioning

confidence: 99%

Co₃O₄‐Based Catalysts for the Low‐Temperature Catalytic Oxidation of VOCs

Xiao,

Zhao,

et al. 2024

ChemCatChem

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Volatile organic compounds (VOCs) are a significant source of environmental pollution, posing threats to human safety. With growing concerns about environmental degradation, catalytic oxidation technology emerges as a paramount and widely adopted approach for VOCs elimination, renowned for its operational simplicity, energy efficiency, and environmental friendliness. As a representative transition metal catalyst, cobalt‐based catalysts have garnered widespread use in VOCs catalytic oxidation due to their costeffectiveness, versatility, and distinctive physicochemical properties. This paper provides a detailed exposition of the construction strategies and structure‐activity relationship of Co3O4‐based catalysts in VOCs oxidation reaction, encompassing both monometallic Co3O4 and multimetallic cobalt‐based catalysts. Furthermore, it offers a comprehensive summary and discussion of the latest research progress concerning Co3O4‐based catalysts in practical applications. Concluding with a meticulous analysis, the paper addresses the technical challenges inherent in developing Co3O4‐based catalysts for VOCs degradation. Additionally, it proposes research directions aimed at overcoming these challenges, contributing to the ongoing discourse on environmental sustainability.

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“…This compound, akin to a typical cubic spinel structure, presents a face-centered cubic structure accumulation body, with Co 3+ residing at the core of octahedron and CO 2+ residing at the core of tetrahedron. Notably, Co 3 O 4 has a feeble Co–O bond [ 16 , 17 ], resulting in the facile migration of surface oxygen vacancy [ 18 ]. In addition, Co 3 O 4 exhibits a predisposition for oxygen vacancy production even at room temperature [ 3 , 19 , 20 , 21 , 22 , 23 ].…”

Section: Catalytic Oxidation Of Methane By Nano-co 3 ...mentioning

confidence: 99%

Recent Advances in Co3O4-Based Composites: Synthesis and Application in Combustion of Methane

et al. 2023

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In recent years, it has been found that adjusting the organizational structure of Co3O4 through solid solution and other methods can effectively improve its catalytic performance for the oxidation of low concentration methane. Its catalytic activity is close to that of metal Pd, which is expected to replace costly noble metal catalysts. Therefore, the in-depth research on the mechanism and methods of Co3O4 microstructure regulation has very important academic value and economic benefits. In this paper, we reviewed the catalytic oxidation mechanism, microstructure regulation mechanism, and methods of nano-Co3O4 on methane gas, which provides reference for the development of high-activity Co3O4-based methane combustion catalysts. Through literature investigation, it is found that the surface energy state of nano-Co3O4 can be adjusted by loading of noble metals, resulting in the reduction of Co–O bond strength, thus accelerating the formation of reactive oxygen species chemical bonds, and improving its catalytic effect. Secondly, the use of metal oxides and non-metallic oxide carriers helps to disperse and stabilize cobalt ions, improve the structural elasticity of Co3O4, and ultimately improve its catalytic performance. In addition, the performance of the catalyst can be improved by adjusting the microstructure of the composite catalyst and optimizing the preparation process. In this review, we summarize the catalytic mechanism and microstructure regulation of nano-Co3O4 and its composite catalysts (embedded with noble metals or combined with metallic and nonmetallic oxides) for methane combustion. Notably, this review delves into the substance of measures that can be used to improve the catalytic performance of Co3O4, highlighting the constructive role of components in composite catalysts that can improve the catalytic capacity of Co3O4. Firstly, the research status of Co3O4 composite catalyst is reviewed in this paper. It is hoped that relevant researchers can get inspiration from this paper and develop high-activity Co3O4-based methane combustion catalyst.

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Solution combustion derived oxygen vacancy-rich Co₃O₄ catalysts for catalytic formaldehyde oxidation at room temperature

Abstract: The rich oxygen vacancies in porous Co3O4 were generated in solution combustion, offering high room-temperature activity for formaldehyde oxidation.

Cited by 8 publications

References 31 publications

Coproduction of Glyceric Acid and Glycolic Acid from Biomass-Based Sugars over a Ru/Co₃O₄ Catalyst

Coproduction of Glyceric Acid and Glycolic Acid from Biomass-Based Sugars over a Ru/Co₃O₄ Catalyst

Co₃O₄‐Based Catalysts for the Low‐Temperature Catalytic Oxidation of VOCs

Recent Advances in Co3O4-Based Composites: Synthesis and Application in Combustion of Methane

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Solution combustion derived oxygen vacancy-rich Co3O4 catalysts for catalytic formaldehyde oxidation at room temperature

Abstract: The rich oxygen vacancies in porous Co3O4 were generated in solution combustion, offering high room-temperature activity for formaldehyde oxidation.

Cited by 8 publications

References 31 publications

Coproduction of Glyceric Acid and Glycolic Acid from Biomass-Based Sugars over a Ru/Co3O4 Catalyst

Coproduction of Glyceric Acid and Glycolic Acid from Biomass-Based Sugars over a Ru/Co3O4 Catalyst

Co3O4‐Based Catalysts for the Low‐Temperature Catalytic Oxidation of VOCs

Recent Advances in Co3O4-Based Composites: Synthesis and Application in Combustion of Methane

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Solution combustion derived oxygen vacancy-rich Co₃O₄ catalysts for catalytic formaldehyde oxidation at room temperature

Coproduction of Glyceric Acid and Glycolic Acid from Biomass-Based Sugars over a Ru/Co₃O₄ Catalyst

Coproduction of Glyceric Acid and Glycolic Acid from Biomass-Based Sugars over a Ru/Co₃O₄ Catalyst

Co₃O₄‐Based Catalysts for the Low‐Temperature Catalytic Oxidation of VOCs