Catalysts
·
2019
·Vol. 9
·期 8
·682
·
IF 3.444
Wenjie Sun,Xiaomin Li,Chao Sun,Zhen Huang,Hualong Xu,Wei Shen
Metal organic frameworks (MOFs) have recently been used as precursors of the catalysts for the combustion of volatile organic compounds (VOCs). In the present work, three kinds of CeO2catalysts were successfully synthesized from Ce-MOF-808, Ce-BTC, and Ce-UiO-66, with specific topological structures and coordinate environments. Catalysts with small particle size, stacking mode, and structural defects could be created by pyrolysis of Ce-MOFs, which affects the activity in the toluene combustion significantly. Raman spectra, XPS, and OSC studies were performed to reveal the formation of defect sites. The thermal redox properties were determined by H2-TPR. Catalytic activity tests were conducted on the toluene combustion, and CeO2-MOF-808 showed the best catalytic performance (T90 = 278 °C) due to its having the largest specific surface area, abundant active surface oxygen species, and low-temperature reducibility.Keywords:Ce-MOF;cerium oxide;catalytic combustion of toluene;environmental catalysis;pyrolysis process
研究领域:
材料科学
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环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Lili Zhang,Chun Shi,Hailong Lu,Hongwei Li,Xiaofan Zhou,Zhiguo Wang,Jinxia Ma
The recyclability of heterogeneous catalysts directly affects their utilization efficiency, use cost, sustainability, and environmental issues. Herein, the flower-like ZnO-Cu nanoparticles with high interfacial reactivity were in-situ synthesized in the porous cellulose gel to obtain the ZnO-Cu/cellulose composite gel (ZnO-Cu/CCG) catalyst, which possesses superior recycling and reusing stability thanks to the bulk nature of the gel. The ZnO-Cu/CCG catalysts with tunable sheet-like and flower-like ZnO were fabricated by the dissolution of cellulose into zinc chloride (ZnCl 2 ) solvent and regeneration using different coagulating baths (water, ethanol, or isopropanol). The CCG prepared from isopropanol coagulation exhibited the highest specific surface area (291.6 m 2 /g) and porosity (92.3%). The various network structures of CCG provided different nucleation sites and growing spaces for controllable preparation of ZnO with tunable morphology. The complete removal of methyl orange (MO), Congo red (CR), and methylene blue (MB) required only 80 sec, 3 min, and 5 min, using flower-like ZnO-Cu/CCG catalysts prepared by isopropanol coagulating bath, the pseudo-first-order rate constant (k) is 2.8170 min −1 , 1.1330 min −1 , and 0.8506 min −1 , respectively, much higher than that of the ZnO-Cu powders. Furthermore, the catalytic reusability of ZnO-Cu/CCG can be investigated over 50 successive cycles, in which the catalytic efficiency did not decrease appreciably.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Jinjun Li,Xiaofei Lu,Feng Wu,Shaoli Qin,Zhixiong You
Structured catalysts and reactors have wide applications in environmental remediation and production of important energy-related chemicals. In thermal catalytic processes, external heater are often required to raise the temperature and ignite the reactions, which might lead to huge setups. Herein, we introduce a novel Joule-heat-ignition catalytic reactor. Using Fe-Cr-Al alloy as catalyst substrate, electric currents can pass directly through the substrate, generating Joule heat and bringing the catalysts to the target temperatures. Therefore, the setup can be simplified by omitting the additional heater; the heat produced inside the substrates can be transferred directly to the catalyst coat to achieve rapid ignition; and the reaction temperature can be flexibly controlled by adjusting the input power. In this work, we loaded manganese oxide catalyst onto an alloy wire and used it to build a Joule-heat-ignition reactor for the catalytic oxidation of carbon monoxide and toluene. The anodization pretreatment generated channels on the alloy surface, which effectively enhanced the catalyst loading. The use of alumina as a secondary support also favored catalyst loading and promoted catalyst dispersion. By adding proper amounts of zirconium, the mechanical stability of the catalyst layer increased. The Joule-heat-ignition catalytic system might provide some inspiration in related environmental catalysis.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2025
·
IF 6.7
Ping Zhang,Xinru Yang,Can Wang,Fuwei Sun,Haibo Liu,Tianhu Chen,Dong Chen,Ziyang Chu,Jin Zhang,Jian Huang,Fazhi Xie
The bimetallic synergistic effect plays a significant role in enhancing the efficiency of antibiotics degradation via hydrogen peroxide (H 2 O 2 ) activation. In this study, the degradation of sulfamethazine sodium (SMT) by H 2 O 2 was comprehensively explored in a system where Cu(II) and Co(II) ions synergistically activate H 2 O 2 in the presence of calcite. The Cu(II)/Co(II)/calcite/H 2 O 2 system using only 1.0 mg/L of Cu(II), exhibits excellent oxidation capacity, enabling complete removal of SMT within 1 h (0.085 min −1 ). This rate is 4.5 and 23.5 times higher than those observed in the Cu(II)/calcite/H 2 O 2 (0.019 min −1 ) and Co(II)/calcite/H 2 O 2 systems (0.0036 min −1 ), respectively. According to scavenger experiments, ESR captures test, and chemical probe experiments, it is determined that Cu(III) primarily contributes to SMT degradation, rather than hydroxyl radicals (·OH), singlet oxygen ( 1 O 2 ), and high valent cobalt-oxo species [e.g. Co(IV)]. The introduction of Co(II) promotes the formation of Cu(III) by accelerating the oxidation of Cu(II). Furthermore, the degradation pathways for SMT are elucidated through UPLC-ESI-MS/MS analysis, and variations in toxicity are rigorously assessed using the ECOSAR program. In summary, this study reveals the highly effective synergistic activation of H 2 O 2 by Cu(II) and Co(II) in the presence of calcite, offering new insights into the comprehensive utilization of calcite in environmental catalysis, particularly for addressing the pollution caused by coexisting heavy metals and antibiotics.
研究领域:
环境科学
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化学工程
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催化
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水污染控制
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高级氧化工艺
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Yisha Zheng,Shuoling Lei,Wenjie Guo,Wenlong Xiang,Yanmei Chen,Yanhui Zhang
The high toxicity and persistence of nitroaromatic pollutants pose a serious threat to aquatic ecosystems. In this study, inert SiO 2 was employed as an "inactive enhancer" to construct core-shell MIL-125-NH 2 @ZIF-67/SiO 2 (M@Z/SiO 2 ) heterogeneous MOF catalysts via an epitaxial-wet impregnation method, enabling the efficient reduction of p -nitrophenol ( p -NP) under ambient temperature and pressure. Although SiO 2 itself lacks catalytic activity, the micro-mesoporous network it forms effectively disperses Co active sites and prevents their aggregation. The conversion rate of p -NP increased from 92.5% to 98.4% within 6 min and retained 98% activity after three consecutive cycles. Moreover, the catalyst exhibited excellent stability across a wide pH range (3-11) and in various anionic environments. Mechanistic studies revealed that the interfacial electron transfer between ZIF-67 and MIL-125-NH 2 significantly reduces the activation energy barrier of NaBH 4 . Additionally, the incorporation of SiO 2 not only enhances the mechanical stability of the composite but also optimizes pore structure and substrate mass transfer by modulating surface hydrophilicity. This work provides valuable insights for the precise design of MOF-on-MOF heterostructures and the synergistic engineering of interfacial and surface properties in environmental catalytic materials.
研究领域:
环境科学
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催化
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材料化学
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纳米技术
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2024
·Vol. 14
·期 10
·687
·
IF 3.8
Na Zhang,Yudong Huo,Chun Pei,Ying Zhang,Lijie Xu,Lu Gan
Percarbonate (SPC) as a promising substitute for liquid H2O2has many advantages in the application of in situ chemical oxidation (ISCO). Developing efficient, cost effective and environmentally friendly catalysts for SPC activation plays the key role in promoting the development of SPC-based ISCO. Herein, the walnut shell biomass was combined with ferric nitrate for the catalytic synthesis of Fe3C@biochar composite (Fe3C@WSB), which demonstrated high efficiency in activating SPC for the removal of diclofenac (DCF). The Fe3C showed average crystallite size of 32.6 nm and the composite Fe3C@WSB demonstrated strong adsorptivity. The prepared Fe3C@WSB could activate both SPC and H2O2with high efficiency at ca. pH 3 with extremely low leaching of iron, while in a weak acidic condition, higher efficiency of DCF removal was obtained in the Fe3C@WSB/SPC process than in the Fe3C@WSB/H2O2process. Moreover, the Fe3C@WSB/SPC and Fe3C@WSB/H2O2processes did not show significant differences when supplied with varying amounts of catalyst or oxidant, but the Fe3C@WSB/SPC process exhibited stronger capability in dealing with relatively highly concentrated DCF solution. Based on quenching experiments and electron spin resonance (ESR) analysis, heterogeneous activation of SPC was assumed as the dominant route for DCF degradation, and both the oxidation by radicals, including •OH, •O2−and CO3•−, combined with electron transfer pathway contributed to DCF degradation in the Fe3C@WSB/SPC process. The cycling experiment results also revealed the stability of Fe3C@WSB. This work may cast some light on the development of efficient catalysts for the activation of SPC.
研究领域:
环境科学
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化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
WATER AIR AND SOIL POLLUTION
·
2025
·Vol. 236
·期 10
·1-13
·
IF 3
Li Yuan,Fan Jun,Huang Bingyao,Li Hongyan,Zhao Jie,Li Kai,Wang Fei
Removal of PH 3 from industrial gases have attracted extensive attention due to its high toxicity and catalyst poisoning characteristics. In this study, a series of copper-based support-free catalysts were synthesized by a facile method using different nitrogen and carbon sources. The 100% removal of PH 3 could reach 540 min in micro-oxygen environment by using the obtained catalyst. The X-ray diffractometer (XRD) and X-ray photoelectron spectroscopy (XPS) results exhibited that the formation of Cu 3 P was contributed to the deactivation of the catalysts, which was considered as active component for the decomposition of PH 3 . The PH 3 decomposition performance could achieve 99% under 450 ℃ with 90% yield of H 2 using the exhausted catalysts. This strategy is beneficial for the development of dephosphorization catalyst and provides a new route for the secondary use of exhausted catalysts. Graphical A facile strategy was employed for synthesize support-free catalysts for PH3 oxidation by using Cu(NO3)2 and different nitrogen resources or carbon resource. The performance were thoroughly compared. The exhausted catalyst was conducted in the PH3 catalytic dissociation reaction, where the conversion rate of PH3 could reach 99% with 90% hydrogen production under 450 ℃.
研究领域:
环境催化
·
材料科学
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工业气体净化
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 39
·17237-17245
·
IF 2.7
Abid Hussain,Yuhua Zheng,Qianyu Wang,Yanbin Cui
In this work, a series of high-entropy oxides (HEOs) was successfully prepared by the calcination of identical metal–organic framework (MOF) precursors. Thermal treatment above 400 °C led to the complete transformation of MOFs into HEOs. The performance of the obtained HEO catalysts in the removal of volatile organic compounds (VOCs) was studied with the catalytic oxidation of toluene as the probe reaction. The optimized Ce-HEO-400 catalyst showed impressive activity and stability over toluene catalytic oxidation, which resulted from the vast quantity of surface oxygen vacancies and the relatively variable metal valence. The T50 and T90 values of Ce-HEO-400 were 180 °C and 255 °C, respectively. Moreover, it also showed excellent stability for 120 h with a 98.5% toluene conversion rate at 260 °C. Combined with the characterizations of XRD, SEM, TEM, BET, H2-TPR, and XPS, it was found that the high dispersion of the active high-entropy structure and the synergistic effects of different metals are the key factors for improving the catalytic performance of the Ce-HEO-400 catalyst. This work not only presents a facile method for synthesizing HEO materials at low temperatures but also provides valuable technical support for the application of HEO catalysts in VOC removal. The findings of this study open up new possibilities for the development of efficient catalysts for the removal of VOCs.
研究领域:
材料科学
·
环境催化
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Chemistry
·
2024
·
IF 6.7
Zhi Jiang,DongXu Fang,Haolin Luo,Zheng Ye,Hua Li,Wenfeng Shangguan
Microwave-assisted catalysis is a promising technique for enhancing catalytic reactions through selective heating, potentially leading to improved reaction rates and energy efficiency. However, understanding the complex interactions between microwave absorption and catalytic performance in composite catalysts remains a challenge. In this study, Cobalt oxide(Co 3 O 4 )/silicon carbide(SiC) composite catalysts with varying SiC content were synthesized and characterized to investigate the relationship between their microwave absorption properties and catalytic performance. Quantitative analysis revealed that SiC and Co 3 O 4 absorb microwave energy through relaxation polarization and magnetic loss mechanisms, respectively. Increasing SiC content enhanced the dielectric and magnetic loss capabilities of the composites, with the Co 3 O 4 /SiC composite containing 10 wt% SiC (Co 3 O 4 /SiC-10) exhibiting a dielectric loss tangent of 3.87 and a minimum reflection loss of −35dB. However, higher SiC content decreased the surface chemically adsorbed oxygen, surface oxygen mobility, and benzene adsorption capacity, weakening the catalytic activity under conventional heating. The Co 3 O 4 /SiC-10 sample achieved a significantly better balance between microwave absorption and catalytic performance, significantly outperforming the original Co 3 O 4 sample under microwave irradiation. These founding establishes a quantitative research methodology that correlates dielectric loss tangent, reflection loss, and other crucial parameters with microwave absorption performance and further catalytic properties, providing insights for the rational design of catalysts that optimize both microwave absorption and catalytic activity.
研究领域:
材料科学
·
环境催化
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2025
·
IF 11.3
Lupeng Han,Xiyang Wang,Fuli Wang,Yongjie Shen,Hengxiang Zhang,Weiwei Hu,Min Gao,Yimin A. Wu,Ming Xie,Jianfu Chen,Dengsong Zhang
Nowadays, it is challenging to achieve SO2-tolerant environmental catalysis for NOx reduction because of the thermodynamically favorable transformation of reactive sites to inactive sulfate species in the presence of SO2. Herein, we achieve enhanced low-temperature SO2-tolerant NOx reduction by manipulating the dynamic coordination environment of active sites. Engineered by coordination chemistry, SiO2-CeO2 composite oxides with a short-range ordered Ce–O–Si structure were elaborately constructed on a TiO2 support. A dynamic coordination environment of active sites is demonstrated from a Ce–O–Si local structure to a low-coordinated Ce-SO42– species in the presence of SO2. The low-coordinated Ce-SO42– species as new active sites maintain a high NO removal efficiency by preserving the good adsorption and activation capacity of NO and NH3 reactants. This work proposes a new notion to improve the SO2 resistance of catalysts by regulating the coordination environment of sulfated active sites, which is of significance for SO2-tolerant environmental catalysis in practical applications.
研究领域:
环境催化
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2025
·Vol. 26
·期 2
·677
·
IF 4.9
Yuhan Zhang,Guilong Peng,Yuting Yan,Xukun Meng,Wenwen Gong
The design of efficient advanced oxidation processes (AOPs) in the presence of bicarbonate has long attracted considerable attention in the field of environmental catalysis. In this study, sodium bicarbonate (NaHCO3) as one of the most abundant substances in actual water, was introduced to a NaClO/Ru(III) system to enhance the removal of acid orange 7(AO7). NaHCO3could significantly improve the removal efficiency of the Ru(III)/NaClO process in HCO3−at a pH range of 6.9–10.0. Ru(V)=O was identified as a dominant reactive species involved in the degradation of pollutants in the NaHCO3/NaClO/Ru(III) system. HCO3−interacts with Ru(III) to generate Ru(III)-HCO3−, which enhances the activation performance of Ru(III) under neutral or alkaline conditions. The removal of AO7 was significantly enhanced with increasing NaHCO3concentration, and the rate constant increased more than 2-fold to 4-fold as NaHCO3concentrations increased from 0 to 100 mM at pH 6.9 and 8.5. This study proposed a novel strategy to enhance the Ru(III)/NaClO process with environmentally friendly inorganic ligands and highlights its potential applications in the removal of pollutants.
研究领域:
环境催化
·
化学工程
·
水处理技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Fangyun Hu,Jianjun Chen,Yue Peng,Hua Song,Kezhi Li,Junhua Li
The catalytic oxidation of toluene has been investigated over pure CeO 2 hierarchical catalyst for the first time. The novel CeO 2 catalyst was prepared by a hydrothermal-driven assembly method. The structure of CeO 2 catalyst was consisted of nanowire self-assembled hierarchical microspheres. The new hierarchical CeO 2 catalyst showed much better catalytic activity than analogous nonporous catalyst by traditional hydrothermal method. The hierarchical CeO 2 catalyst could reach more than 90% toluene conversion even as low as 210 °C (T 90 ) under a high space velocity of 60,000 mL/(g·h). The high catalytic activities could be attributed to the large surface areas, in addition, the hierarchical porous structures provide more contents of surface oxygen vacancies for the dissociation of gaseous O 2 on the surface.
研究领域:
材料科学
·
环境催化
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）