Journal of Environmental Chemical Engineering
·
2024
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IF 7.4
Xiaocong Qin,Qi Xue,Changluo Su,Yuan Dang,Xiaoqin Sun,Yuanzhen Zhou
Catalytic oxidation is an efficient method for mitigating toluene emissions, but enhancing catalytic performance for toluene oxidation remains a challenge. To enhance the oxidation capacity of catalysts, appropriate morphology and composition adjustments are required. Herein, the porous CeO 2 -Co 3 O 4 hybrid nanosheets (CeO 2 -Co 3 O 4 HNSs) have been designed and prepared by the hydrothermal method . Compared with single composition CeO 2 and Co 3 O 4 , the CeO 2 -Co 3 O 4 HNSs exhibit superior performance, achieving a remarkable 90% toluene conversion at a reaction temperature of 215°C with a space velocity of 36,000 mL/(h·g). Their enhanced activity can be attributed to the unique morphology and multi-component synergistic effect. The introduction of Co can significantly increase the content of oxygen vacancy and optimize the electronic structure, which can enhance the formation of surface-active oxygen and accelerate the cycle of the Ce 3+ /Ce 4+ redox pair. This work establishes a promising avenue for treating volatile organic compounds in exhaust emissions.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Wei Fang,Jinghuan Chen,Xiangyuan Zhou,Jianjun Chen,Zhiping Ye,Junhua Li
In this work, a core–shell structured CeO2@Co3O4 catalyst was successfully prepared by using a zeolitic imidazolate framework-based material as a sacrificial template. The structure, morphology, and physicochemical characteristics of these materials were investigated by X-ray diffraction, N2 sorption, Fourier transform infrared spectroscopy, Raman spectroscopy, field emission scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, temperature-programmed desorption, and temperature-programmed reduction studies. Compared with pure Co3O4 and CeO2, the CeO2@Co3O4 sample displayed superior catalytic performance (T90 = 225 °C) toward toluene oxidation. Results demonstrated that the CeO2@Co3O4 sample exhibited a core–shell structure, with hierarchically wrinkled surfaces. This unique structure, especially the interface between the core and the shell, endowed the CeO2@Co3O4 catalyst with better activity. In addition, there was a synergistic effect between cerium and cobalt oxides in the core–shell bimetallic sample, which was responsible for the improved performance of the material. Moreover, surface-active oxygen species involved and played a significant role in toluene oxidation.
研究领域:
催化材料
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环境科学
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材料化学
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DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
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2024
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IF 2.6
Xiao Mi,Hui Xinyu,Yang Songyi,Du Xinyue,Gao Xiaofan,Song Zhuoyuan,Zhang Weixi,Xiao Meng
Supercapacitor (SC) electrodes with excellent capacity and multiplicity performance have been in demand for a long time. In this paper, CeO 2 /Co 3 O 4 nanorod arrays were firstly synthesized by hydrothermal method and thermal treatments, and then NiCo 2 S 4 were successfully wrapped around CeO 2 /Co 3 O 4 nanorod arrays by electrodeposition. On the one hand, the CeO 2 /Co 3 O 4 nanorod arrays acted as a core layer to provide a scaffold for the continuous and stable conductivity of the electrochemical reaction, while on the other hand, the NiCo 2 S 4 played an important role in increasing the capacity due to their high conductivity. The electrochemical properties of NiCo 2 S 4 @ CeO 2 /Co 3 O 4 electrode materials were remarkable improvement due to the synergistic and complementary effect. The area capacitance of the prepared NiCo 2 S 4 @ CeO 2 /Co 3 O 4 nanorod arrays was 1576.67 mF cm −2 with a current density of 1 mA cm −2 . And the intrinsic and transfer resistances of the composites were 0.816 Ω and 0.064 Ω. Meanwhile, the asymmetrical supercapacitors exhibited excellent energy density (0.074 mWh cm −2 ) with the power density of 0.805 mW cm −2 . The capacitive retention rate after 5000 cycles was 93.25%. This study demonstrates that the 3D core–shell structure of NiCo 2 S 4 @ CeO 2 /Co 3 O 4 nanorod arrays has a good practical application potential in supercapacitor devices.
研究领域:
材料科学
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电化学
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纳米技术
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能源存储
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
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IF 9.9
Huihui Shi,Peixin Yang,Lu Huang,Yali Wu,Duohuan Yu,Hangfei Wu,Yunhuai Zhang,Peng Xiao
The design and manufacture of high activity and thermal stability catalysts with minimal precious metal loading is essential for deep degradation of volatile organic compounds (VOCs). In this paper, a novel single-atom Pt-CeO 2 /Co 3 O 4 catalyst with ultra-low Pt loading capacity (0.06 wt%, denoted as 0.06Pt-SA) was fabricated via one-step co-precipitation method. The 0.06Pt-SA exhibited excellent toluene degradation activity of T 90 = 169 °C, matched with the nanoparticle Pt-supported CeO 2 /Co 3 O 4 catalyst with more than six times higher Pt loading (0.41 wt%, denoted as 0.41Pt-NP). Moreover, the ultra-long durability (toluene conversion remains 99% after 120 h stability test) and excellent toluene degradation ability in a wide space speed range of 0.06Pt-SA were superior to that of 0.41Pt-NP catalyst. The excellent performance was derived from the strong metal-support interaction (SMSI) between the single atomic Pt and the carrier, which induced more Pt 0 and Ce 3+ for oxygen activation and more Co 3+ for toluene removal. The in situ diffuse reflectance infrared spectroscopy (DRIFTS) experiments confirmed that the conversion of intermediates was accelerated in the reaction process, thereby promoting the toluene degradation. Our results should inspire the exploitation of noble single-atomic modification strategy for developing the low cost and high performance VOCs catalyst.
研究领域:
催化化学
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环境科学
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材料科学
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DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
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IF 9.9
Longwen Chen,Feng Liu,Xiaoqian Li,Qiuzhen Tao,Zhaoqin Huang,Qi Zuo,Yanwu Chen,Tan Li,Mingli Fu,Daiqi Ye
Metal oxide-oxide interface on supported catalyst has been rarely studied due to the complex interfacial structure and synthetic challenge. Herein, different Ag-supported CeO 2 /Co 3 O 4 samples with various covered-state of CeO 2 were prepared for catalytic soot oxidation. In comparison, catalytic activity was significantly improved by grafting CeO 2 on Co 3 O 4 , in which the best performing Ag/CoCe-2 exhibited remarkable catalytic performance towards soot oxidation with a T 50 of 290.5 ℃ under 10 % O 2 /N 2 . Catalyst characterization investigated by Scanning Electron Microscope (SEM), quasi in-situ X-ray Photoelectron Spectroscopy (XPS), in-situ Raman, etc. revealed that this outstanding promotion in catalytic activity can be principally ascribed to the formation of the CeO 2 /Co 3 O 4 interface. An appropriate CeO 2 dosage maximized the contact and interaction between Co 3 O 4 and CeO 2 , resulting in the largest CeO 2 /Co 3 O 4 interface featured with abundant generated superoxide species and activated surface lattice oxygen. Density functional theory (DFT) calculations were also carried out for the oxygen vacancy formation energy, Gibbs free energy, etc. In presence of the CeO 2 /Co 3 O 4 interface, a charge density redistribution around the adsorbed reactants at oxygen vacancies could be formed, owing to the efficient charge transfer enhanced by the electron-appealing effect. The change in electronic structure favored reducing the oxygen vacancy formation energy and boosting the lattice oxygen activation induced by the hybridized Co-O-Ce bonds, finally lowering the adsorption and activation barriers for reactive species and accelerating the reaction kinetics.
研究领域:
材料科学
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催化化学
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环境科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF CATALYSIS
·
2024
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IF 6.5
Yuxi Meng,Shaomian Liu,Yixi Wang,Wenqing Xu,Jiajian Gao,Sansan Yu,Fabing Su,Tingyu Zhu
Selective catalytic reduction of NO using CO (CO-SCR) is a promising technology for the purification of NO in the flue gas. However, the presence of O 2 significantly inhibits the activity of the CO-SCR catalyst. Herein, we synthesize a hollow Mn-doped CeO 2 @Co 3 O 4 catalyst (Mn-CeO 2 @Co 3 O 4 ), which achieved 82% NO conversion, 100% CO conversion, and 78% N 2 selectivity under 5 vol% O 2 at 200 °C, superior to those of CeO 2 @Co 3 O 4 and Co 3 O 4 @CeO 2 catalysts. The characterization results indicate that the strong electronic interaction at the heterointerfaces between Co 3 O 4 and CeO 2 plays a crucial role in promoting selective adsorption of NO. Furthermore, the Mn doping into the Co 3 O 4 lattice of the catalyst facilitates the conversion of N 2 O intermediates, thereby enhancing the overall activity. This research provides a new strategy for the design and synthesis of CO-SCR catalysts.
研究领域:
催化
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环境科学
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材料科学
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产品关联
DOI
高影响因子
CHEMOSPHERE
·
2023
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IF 8.8
Xianhua Ji,Huiyu Liang,Sukai Hu,Bo Yang,Ke Xiao,Gang Yu
A novel CuO–CeO 2 –Co 3 O 4 nanocatalyst loaded on Al 2 O 3 ceramic composite membrane (CCM-S) was synthesized through spraying-calcination method, which can be beneficial to the engineering application of scattered granular catalyst. BET and FESEM-EDX testing revealed that CCM-S possessed a porous character with high BET surface area of 22.4 m 2 /g and flat modified surface with extremely fine particle aggregation. The CCM-S calcined above 500 °C presented excellent anti-dissolution effect due to the formation of crystals. XPS indicated that the composite nanocatalyst possessed the variable valence states, which were conducive to exert the catalytic effect of Fenton-like reaction. Subsequently, the effects of experimental parameters including fabricate method, calcination temperature, H 2 O 2 dosage, initial pH value, and CCM-S amount were further investigated considering the removal efficiency of Ni(II)-complex and COD after decomplexation and precipitation (pH = 10.5) treatment within 90 min. Under the optimal reaction condition, the residual Ni(II)-complex and Cu(II)-complex concentration from actual wastewater was all lower than 0.18 mg/L and 0.27 mg/L, respectively; meanwhile, the removal efficiency of COD was all higher than 50% in the mixed electroless plating effluent. Besides, the CCM-S could still maintain high catalytic activity after a six-cycle test, and the removal efficiency was slightly declined from 99.82% to 88.11%. These outcomes indicated that CCM-S/H 2 O 2 system was provided with a potential applicability on treatment of real chelated metal wastewater.
研究领域:
环境工程
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材料科学
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废水处理
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产品关联
DOI
PubMed
高影响因子
Small
·
2021
·Vol. 17
·期 43
·2101393
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IF 13.281
Shiyin Zhao,Yangke Long,Yiping Su,Shubin Wang,Zuotai Zhang,Xuanjun Zhang
Antibiotics discharge has been a critical issue as the abuse in clinical disease treatment and aquaculture industry. Advanced oxidation process (AOPs) is regarded as a promising approach to degrade organic pollutants from wastewater, however, the catalysts for AOPs always present low activities, and uncontrollable porosities, thus hindering their further wider applications. In this work, an aliovalent-substitution strategy is employed in metal-organic framework (MOF) precursors assembly, aiming to introduce Co(II/III) into Ce-O clusters which could modify the structure of the clusters, then change the crystallization, enlarge the surface area, and regulate the morphology. The introduction of Co(II/III) also enlarges the pore size for mass transfer and enriches the active sites for the production of sulfate radicals (SO 4 • − ) in MOF-derived catalysts, leading to excellent performance in antibiotics removal. Significantly, the CeO 2 •Co 3 O 4 nanoflowers could efficiently enhance the generation of sulfate radical SO 4 • − and promote the norfloxacin removal efficiency to 99% within 20 min. The CeO 2 •Co 3 O 4 nanoflowers also present remarkable universality toward various antibiotics and organic pollutants. The aliovalent-substitution strategy is anticipated to find wide use in the exploration of high-performance MOF-derived catalysts for various applications.
研究领域:
环境科学
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材料科学
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化学工程
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催化
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废水处理
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产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2026
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IF 17.2
Yue Zeng,Hongsheng Wang,Jing Xuan,Ping Xiao,Yaoyao Feng,Shuai Lyu,Junjiang Zhu
Although CeO 2 /Co 3 O 4 composites exhibit excellent catalytic performance in oxidation reactions, the atomic-scale origin of their interfacial interactions remains unclear. In this work, we compare two contrasting catalysts: Co 3 O 4 -supported Ce single atoms and Co 3 O 4 -supported CeO 2 nanoparticles. We reveal that these two forms of Ce promote catalytic performance through different mechanisms. Ce single atoms occupy the octahedral Co 3+ sites within the Co 3 O 4 structure, forming Ce 3+ -Vo-Co active sites and thereby induce local compressive strain and facilitate the formation of point-defective oxygen vacancies. More importantly, Ce 3+ acts as an electron donor, elevating the d -band center of Co and facilitating O 2 activation via enhanced electron transfer to O 2 antibonding orbitals. In contrast, the extensive interfacial contact between CeO 2 nanoparticles and Co 3 O 4 triggers ion migration, which subsequently generates defects or amorphous interfacial domains with high oxygen mobility. The configuration of interfacial defects is highly dependent on the size of CeO 2 nanoparticles. Catalytic tests for the liquid-phase aerobic oxidation of benzyl alcohol confirm the superior performance of the single-atom catalyst, which exhibits 1.5 times higher activity and a 27.7 kJ/mol lower activation energy than its CeO 2 nanoparticle counterpart. Our findings demonstrate that the interaction between Ce species and Co 3 O 4 is dominated by electronic effects when Ce is atomically dispersed, whereas interfacial reconstruction becomes predominant with increasing CeO 2 nanoparticles size.
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产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2026
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IF 21.1
Shan-Shan Liu,Huifen Fu,Shujian Li,Hongli Liu,Yichen Guo,Chen Zhao,Zhihua Wang
To precisely engineer the polymerization-deposition (PD) route of Fenton-like reactions for efficient phenols decontamination, this study developed a CeO 2 /Co 3 O 4 composite featuring abundant interfacial asymmetric oxygen vacancies (As-OVs), addressing ambiguous structure-activity relationship and unclear catalytic mechanism in PD route regulation. The catalytic behavior, peroxymonosulfate (PMS) activation pathway, phenols transformation mechanism and continuous operation performance were systematically investigated via experiments, characterization and theoretical calculation. Compared with symmetric oxygen vacancies (S-OVs) in Co 3 O 4 alone, As-OVs altered phenols oxidation from mineralization to PD route by anchoring PMS via terminal oxygen atoms rather than peroxide bond, avoiding O-O bond cleavage along with radical pathway, thus suppressing oxidant waste and enabling 100 % ETP-triggered PD route. At ultra-low PMS/BPA ratio (1.14), 79.7 % TOC removal was achieved, reducing PMS consumption to 4 % vs. mineralization pathway and enabling long-term continuous practical wastewater treatment. Experimental and theoretical calculation revealed that the unique PMS adsorption configuration, greater electron rearrangement tendency and enhanced phenoxyl radical adhesion around As-OVs facilitate efficient coupling to form crosslinked products on the catalyst, ensuring excellent structural and catalytic stability of OVs-CeO 2 /Co 3 O 4 . These findings deepen understanding of metal oxide-guided PD route via interfacial defect engineering, contributing to cost-efficiency and advancing high-performance, sustainable wastewater decontamination technologies with long-term operation.
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高影响因子
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