ACS Applied Nano Materials
·
2025
·
IF 5.5
Juanjuan Yang,Dandan Shao
CO2 to methanol is considered a promising method for CO2 conversion and utilization, yet achieving desirable selectivity remains a significant challenge. Herein, efficient CO2 hydrogenation to methanol is achieved by synthesizing Co0.7ZnO with abundant oxygen vacancies (Ov) through the incorporation of a portion of Co into nanoscale ZnO. By tuning the molar ratio of Co/(Co+Zn) in CoxZnO to increase the Ov content to 71%, CO2 adsorption and activation to form formate (COOH*) are enhanced, thereby reducing the CO selectivity. The efficiency of the hydrogenation of CO2 to methanol was optimized with Co0.7ZnO, which exhibited an impressive methanol formation rate of 2.1 mmol/(g h) and a selectivity of up to 96.7%. The unique structure of incorporating partial Co into nanoscale ZnO to increase the level of Ov not only reduces the level of CO selectivity but also inhibits methane formation, thereby contributing to the high methanol selectivity. This study presents an innovative strategic design through partial doping, which is essential for controlling the selectivity of target products in the CO2 hydrogenation.
研究领域:
化学工程
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材料科学
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环境科学
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产品关联
DOI
高影响因子
Engineering
·
2021
·
IF 7.553
Xinyu Cao,Tiancheng Pu,Bar Mosevitzky Lis,Israel E. Wachs,Chong Peng,Minghui Zhu,Yongkang Hu
Reductive pretreatment is an important step for activating supported metal catalysts but has received little attention. In this study, reconstruction of the supported nickel catalyst was found to be sensitive to pretreatment conditions. In contrast to the traditional activation procedure in hydrogen, activating the catalyst in syngas created supported Ni nanoparticles with a polycrystalline structure containing an abundance of grain boundaries. The unique post-activation catalyst structure offered enhanced CO adsorption and an improved CO methanation rate. The current strategy to tune the catalyst structure via manipulating the activation conditions can potentially guide the rational design of other supported metal catalysts.
研究领域:
催化化学
·
材料科学
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DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2024
·
IF 10.8
Aiyong Wang,Jiajia Ding,Mingqi Li,Peiyao Song,Zhiyuan Zhao,Yanglong Guo,Yun Guo,Li Wang,Qiguang Dai,Wangcheng Zhan
Short carbon chain alkanes, as typical volatile organic compounds (VOCs), have molecular structural stability and low molecular polarity, leading to an enormous challenge in the catalytic oxidation of propane. Although Ru-based catalysts exhibit a surprisingly high activity for the catalytic oxidation of propane to CO2 and H2O, active RuOx species are partially oxidized and sintered during the oxidation reaction, leading to a decrease in catalytic activity and significantly inhibiting their application in industrial processes. Herein, the Ru/Ce@Co catalyst is synthesized with a specific structure, in which cerium dioxide is dispersed in a thin layer on the surface of Co3O4, and Ru nanoparticles fall preferentially on cerium oxide with high dispersity. Compared with the Ru/CeO2 and Ru/Co3O4 catalysts, the Ru/Ce@Co catalyst demonstrates excellent catalytic activity and stability for the oxidation of propane, even under severe operating conditions, such as recycling reaction, high space velocity, a certain degree of moisture, and high temperature. Benefiting from this particular structure, the Ru/Ce@Co (5:95) catalyst with more Ce3+ species leads to the Ru species being anchored more firmly on the CeO2 surface with a low-valent state and has a strong potential for adsorption and activation of propane and oxygen, which is beneficial for RuOx species with high activity and stability. This work provides a novel strategy for designing high-efficiency Ru-based catalysts for the catalytic combustion of short carbon alkanes.
研究领域:
催化化学
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材料科学
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环境工程
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产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 11
·1-10
·
IF 5.3
Yang Shuning,Tian Li,Feng Yongbo,Song Yujia,Li Ruidan,Guo Yanjia,Li Huiling,Li Chao,Lu Juan
A highly sensitive molecularly imprinted electrochemiluminescence (MIECL) sensor was developed for detecting rifampicin (RIF) based on luminol@Co-MOF. Co-MOF had a significant enhancement of ECL signaling in the luminol-O 2 system. Molecular imprinted polymers (MIPs) with the introduction of RIF provide new properties for the specific recognition of RIF. A noteworthy decrease in ECL intensity was observed with higher concentrations of RIF. Consequently, the ECL signal was controlled by RIF elution from and adsorption by the MIP, thus establishing a new method for RIF detection. Under optimal conditions, this sensor exhibited linear detection ranges of RIF between 1.0 × 10 −11 mol L −1 and 1.0 × 10 −6 mol L −1 , with a detection limit of 3.3 × 10 −12 mol L −1 ( S / N = 3). The recoveries ranged between 98.1 and 106.0% in fish samples. This method can be used as a sensitive and rapid method to detect RIF in real samples. Graphical
研究领域:
分析化学
·
药物检测
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产品关联
DOI
PubMed
高影响因子
Molecular Catalysis
·
2024
·
IF 3.9
Rui Lu,Jiaying Luo,Xuening Wang,An Chen,Yiwen Xie,Yang Xu,Tian Shang,Ruyan Li,Dongmei Jiang,Qingfeng Zhan
In this study, an efficient Co-doped Ag 3 PO 4 photocatalyst was prepared by the deposition method. Compared with Ag 3 PO 4 , the degradation efficiency of the optimal sample CAP-2 (the mole ratio of Co/Ag was 0.057 %) for MO (20 mgL −1 ) increased from 53.4 % to 95.0 % within 20 min, and the degradation efficiency for phenol (20 mgL −1 ) increased from 57.9 % to 91.8 % within 80 min. Moreover, the CAP-2 sample performed excellent mineralization ability and stable recycling capacity. Free radical capture experiments and electron spin resonance (ESR) measurements indicated that holes (h + ) and superoxide radicals (⋅O 2− ) were the main active radicals. Doping Co ions broadened the optical absorption, introduced impurity level to promote the separation of carriers, and generated additional ⋅O 2− owing to the mutual conversion of Co 3+ and Co 2+ , thus considerably improving Ag 3 PO 4 photocatalytic performance. This work provides a new reference for doping metal ions modified semiconductor photocatalysts to efficiently degrade organic pollutants.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Siwen Gong,Gangqiang Zhu,Xiaoqian Xie,Fei Rao,Lujun Zhu,Yurong An,Xianjin Shi,Yu Huang,Peng Liu,Mirabbos Hojamberdiev
A novel interface of MnO 2 with CuO with multivalent conversion is fabricated by the deposition-precipitation method for low-temperature and efficient CO oxidation. It is found that the temperature for CO thermal-catalytic oxidation to reach a complete conversion significantly decreases to 105 °C for the CuO/MnO 2 . A combination of experimental and theoretical studies demonstrates the successful formation of the CuO/MnO 2 interface, inducing a pronounced effect that promotes CO oxidation. The CuO/MnO 2 interface leads to the formation of Cu-O-Mn, a superior redox system with multivalent conversion (Cu + + Mn 4+ ↔ Cu 2+ + Mn 3+ , Cu + + Mn 3+ ↔ Cu 2+ + Mn 2+ ), abundant active sites, excellent ability to activate O 2 , the rapid oxygen transfer, and more suitable adsorption energy for O 2 , CO, and CO 2 . These characteristics are advantageous to Cu x O-Mn x O y for achieving a 100 % removal of CO at a lower temperature. Furthermore, the computational study reveals that the CO oxidation process follows two mechanistic pathways (Eley-Rideal (E-R) and Mars-van Krevelen (M-K)), indicating that there is no competitive adsorption of CO and O 2 on the CuO/MnO 2 . This study shows that the interface created between suitable metal oxides can improve the catalytic performance and provides new perspective for catalyst design and performance enhancement mechanisms.
研究领域:
材料科学
·
催化化学
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DOI
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2025
·
IF 6.2
Yao Tong,Tianhua Yang,Jian Wang,Bingshuo Li,Haijun Zhang,Rundong Li
Hydrodeoxygenation (HDO) of lignin-derived phenolic compounds plays a crucial role in the production of renewable biofuels. In this regard, a series of different Co@NC catalysts were prepared with ZIF-67 as a sacrificial template by modulating the catalyst pyrolysis temperature and used for the catalytic hydrodeoxygenation of lignin-derived phenolic model compound 4-ethylphenol for the preparation of cyclohexanols/ cyclohexanes. The results showed that the low-temperature pyrolysis will retain a large number of CoO x compounds, which led to a high dispersion of Co. For Co@NC catalysts, the uniformly dispersed Co component facilitated the adsorption and transfer of hydrogen, and the exposed surface of the carrier promoted the adsorption of reactants. The pyrolysis temperature also played a crucial role in the differences in catalyst crystal surface, specific surface area, acid strength distribution and oxygen vacancies. Co@NC catalyst prepared at 600 °C has a stronger hydrogen absorption capacity, the largest specific surface area and a higher number of oxygen vacancies. Therefore, the Co@NC-600 catalyst showed the best HDO activity. Under the mild conditions (220 °C, 2.5 h and 3 MPa H 2 ), the conversion of 4-ethylphenol was close to 100 %, and the selectivities of 4-ethylcyclohexanol and ethylcyclohexane were 62.7 % and 10.8 %, respectively.
研究领域:
化学工程
·
能源科学
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产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2024
·Vol. 99
·期 4
·922-930
·
IF 2.8
Dingshuo Zhang,Heqian Zhang,Yue Li,Daolai Sun,Jianhua Lv
BACKGROUND Levulinic acid is an important platform chemical derivable from lignocellulosic biomass. In this work, the hydrogenolysis of levulinic acid to produce 1,4-pentanediol was performed over some Co-based non-noble catalysts. The relationship between the catalyst properties and the catalytic activity was investigated, and the effects of the reaction conditions on the catalytic activity were studied. RESULTS The Co/ZrO 2 catalyst prepared by a coprecipitation method showed a high catalytic performance in the hydrogenolysis of levulinic acid to form 1,4-pentanediol. The calcination of Co/ZrO 2 significantly affected the catalytic activity, and a high calcination temperature of 750 °C could promote the formation of 1,4-pentanediol. Meanwhile, the reduction of Co/ZrO 2 at 400 °C in an H 2 flow was beneficial for producing 1,4-pentanediol, and the Co species after the reduction existed as the forms of Co 2+ and Co 0 . A high H 2 pressure and a moderate reaction temperature of 200 °C were beneficial for producing 1,4-pentanediol, and a high 1,4-pentanediol selectivity of 85.6% with a complete conversion of levulinic acid was obtained over the Co/ZrO 2 catalyst at 200 °C under an H 2 pressure of 7 MPa. CONCLUSION The Co species in the 400 °C-reduced Co/ZrO 2 catalyst existed as the forms of Co 2+ and Co 0 . It was proposed that the synergistic effect of Co 2+ and Co 0 contributed to the effective formation of 1,4-pentanediol from levulinic acid. © 2024 Society of Chemical Industry (SCI).
研究领域:
化学工程
·
可再生能源
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产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2014
·Vol. 43
·期 26
·9968-9975
·
IF 4.097
Xiujuan Jiang,Li Long,Hailong Wang,Limei Chen,Xiaoming Liu
The CO-releasing behaviours of nine diiron carbonyl complexes (1–9) were examined via the substitution reaction of cysteamine (CysA), of which complex 4 was reported recently. These complexes fall into three categories, the diiron core bridged by two thiolates, a dithiolate and 1,8-naphthalene dithiolate. Our results reveal that the CO-releasing rates of these complexes are highly dependent on their structures. Complexes (2–4) bearing two monothiolates as their bridging linkage (“open” form) are more vulnerable to decomposition upon nucleophilic substitution reactions compared with complexes (6–9) that possess a dithiolate as their bridging linkage. When the bridging linkage lacks an electron-donating group (complex 1), the metal centre is less negatively charged as revealed by DFT calculation, and thus it exhibits fast substitution reaction with CysA to release CO. A linkage with conjugating nature (5) shows a similar effect because electron density on the metal centre decreases due to electron-density diverting from the metal centre into the naphthalene moiety. Kinetic analysis suggests that CO-releasing at the first stage of these complexes is a first-order reaction.
研究领域:
化学
·
医学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Kexin Huang,Wanqing Zhang,Rajkumar Devasenathipathy,Zhongyun Yang,Xiaoxia Zhang,Xiaoqu Wang,Du-Hong Chen,Youjun Fan,Wei Chen
The economical, efficient and durable oxygen reduction catalysts facilitate the enhancement of electrochemical energy devices competitiveness towards widespread applications. In view of this, we provide an innovative sulfuration inducing method for the synthesis of ZnS and cobalt nanoparticles decorated N, S co-doped CNTs (ZnS/Co-NSCNTs) catalyst. S introduced into the zinc-based zeolitic imidazolate frameworks (ZIF-8) and cobalt-based zeolitic imidazolate frameworks (ZIF-67) precursors via pyrolysis , and induced the generation of ZnS/Co-NSCNTs have been confirmed by XRD , SEM, TEM, and XPS techniques . The key features including activity sites, transfer channels and adsorption energy back up the excellent electrocatalytic activity of the as-prepared ZnS/Co-NSCNTs towards oxygen reduction reactions (ORR). ZnS/Co-NSCNTs additionally exhibited a positive half-wave potential of 0.871 V (vs. RHE) with improved current density towards ORR. In alkaline medium , ZnS/Co-NSCNTs catalyst displayed a high tolerance towards methanol and an excellent long-term cycling stability. The observed onset potential for our prepared ZnS/Co-NSCNTs catalyst is analogous with the commercially available noble metal catalysts . Also, ZnS/Co-NSCNTs catalyst as a cathode in zinc-air battery displayed an enhanced electrochemical performance with a highly specific capacity of 750.1 mAh g −1 , outstanding cycling stability, and high rate behavior. This work provides a new approach for the construction of stable low-cost alternative air-cathode catalysts for other energy conversion and storage applications.
研究领域:
材料科学
·
电化学
·
能源存储与转换
✓ 已验证
DOI
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Yong Shi,Xin Lan Ma,Jin Suo Gao,Feng Yun Yu,Chun Yan Li,Wei Xiong,Li Ping Huang
The catalytic activity, adsorption and synergistic effect over bimetallic MOF derivatives with different dopant metal were systemically compared. A series of Me-Cu/TiO 2 (Me=Fe, Co, Ni) derived from bimetallic Me/Cu-BTC MOFs were fabricated via a sacrificing template method and applied for CO-SCR. Among the bimetallic catalysts, Fe-Cu/TiO 2 presented the best low-temperature of nearly 100% NO conversion from 150 °C to 350 °C with good NO selectivity. For Me-Cu/TiO 2 (Me=Fe, Co, Ni), the productions of crucial Cu + intermediate were determined to be 51.17%, 50.45%,49.4% by XPS, which were consistent with their catalytic activity results. The superior redox behavior of Fe-Cu/TiO 2 can be attributed to its higher Oβ / (Oα +Oβ) ratio of 32.90% and the higher Me 2+ / Me 3+ ratio of 1.79. In situ infrared analysis revealed that the Fe doping not only improved the formation and stability of nitrate species, but also enhanced the quantity of Lewis acid sites by forming Cu + -CO. Furthermore, a possible low-temperature Langmuir-Hinshelwood (L-H) mechanism over Me-Cu /TiO 2 (Me=Fe, Co, Ni) was proposed.
研究领域:
材料科学
·
环境催化
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Rui Gou,Yong Li,Qilong Chen,Sha Wang,Dan Sun,Changhua Li,Xianmin Gong,Yi He
Metal corrosion causes a lot of waste of resources, and the protection of metals from corrosion is becoming increasingly important. In this study, zeolite-imidazole (ZIF-67) was grown on the surface of Co-MOF for the first time by a one-step (complexation) method. 2-Mercaptobenzimidazole (MBI) was then loaded into the inner cavity of ZIF-67, resulting in the formation of a new composite material, Co-MOF@ZIF-67@MBI. The modified Co-MOF exhibits excellent interfacial compatibility with the water-based epoxy resin, and the Co-MOF@ZIF-67@MBI composite coating demonstrates robust anti-corrosion properties. Following a 60-day immersion period, the electrochemical experiment demonstrated that the corrosion resistance modulus of the Co-MOF@ZIF-67@MBI composite coating reached 10 8 Ω cm², indicating that the coating effectively enhanced the corrosion resistance of the coating and significantly extended the service life of the coating.
研究领域:
材料科学
·
腐蚀与防护
·
复合材料
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）