Small
·
2023
·
IF 13.3
Jiajin Lin,Shuaiqi Zhao,Jin Yang,Wei-Hsiang Huang,Chi-Liang Chen,Tingyu Chen,Yun Zhao,Guangxu Chen,Yongcai Qiu,Lin Gu
The development of catalysts with abundant active interfaces for superior low-temperature catalytic CO oxidation is critical to meet increasingly rigorous emission requirements, yet still challenging. Herein, this work reports a PtCo/CoO x /Al 2 O 3 catalyst with PtCo clusters and enriched Pt─O─Co interfaces induced by hydrogen spillover from the Pt sites and self-oxidation process in air, exhibiting excellent performance for CO oxidation at low temperatures and humid conditions. The combination of structural characterizations and in situ Fourier transform infrared spectroscopy reveals that the PtCo cluster effectively prevents CO saturation/poisoning on the Pt surface. Additionally, the presence of Pt─O─Co interfaces in the PtCo/CoO x /Al 2 O 3 catalyst provides a significant number of active sites for oxygen activation and ─OH formation. This facilitates efficient generation of CO 2 at ambient temperature by coupling with nearby adsorbed CO molecules, resulting in superior low-temperature activity and long-term stability for CO oxidation under humid conditions. This work provides a facile route toward rationalizing the design of catalysts with more active interfaces for superior low-temperature CO oxidation under humid conditions for practical applications.
研究领域:
催化
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材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Physical Chemistry C
·
2024
·
IF 3.3
Wenhao Xu,Yujie Cao,Binhang Wang,Zitao Zhang,Xiang Li,Libo Sun,Guangnan Liu,Yun Tang
Metal–metal oxide nanostructures have drawn increasing research attention due to their unique properties enabled by strong interfacial interactions. However, the synthesis of metal–metal oxide nanocomposites with well-controlled architectures such as the core@shell structure remains challenging. Additionally, introducing plasmonic metal can endow the nanomaterials with photoresponsive functions, offering opportunities for optical modulation of catalytic properties. In this work, we designed and fabricated an over-reduced Au@CoOx-Co core–shell nanostructure using an improved seed growth process involving carbonyl precursors. The Au core serves as an in situ catalyst facilitating the over-reduced CoOx-Co shells, and the strong interfacial interaction introduces abundant oxygen vacancies (OVs) to provide reactive sites. Meanwhile, the Au core generates excitons under light irradiation, which can significantly enhance the activation of peroxymonosulfate (PMS) for degrading fluorine-containing pollutants. This design synergistically integrates structural design, photoelectronic regulation, and catalytic enhancement, demonstrating a promising application in the future.
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
CARBON
·
2021
·
IF 9.594
Yuxiang Liu,Xuejun Xu,Sufan Zheng,Shangchun Lv,Hewen Li,Zhichun Si,Xiaodong Wu,Rui Ran,Duan Weng,Feiyu Kang
Aluminum-doped strontium titanate SrTiO 3 (Al), has been demonstrated as the suitable photocatalyst for overall water splitting. Noble metals, such as RhCrO x , are widely applied to accelerate the photocatalytic hydrogen evolution . Herein, Ni single atoms anchored on nitrogen-doped graphene (Ni SA-NG) are adopted to replace noble metal as hydrogen (H 2 ) evolution cocatalysts for SrTiO 3 (Al)/CoO x photocatalyst. The prepared Ni SA-NG/SrTiO 3 (Al)/CoO x photocatalyst exhibits remarkable activity for photocatalytic overall water splitting with the H 2 evolution rate of 498 μmol g −1 h −1 and oxygen (O 2 ) evolution rate of 230 μmol g −1 h −1 , respectively. Ni SA-NG not only improves the efficiency of photogenerated charge transfer and separation through the Ti–O–C bonds acting as the electron transfer freeway, but also provides highly active sites to accelerate the surface H 2 evolution rate. This research provides a valuable method to construct SrTiO 3 -based photocatalyst without noble metal cocatalysts.
研究领域:
材料科学
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催化化学
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能源科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Zeyu Liu,Kefan Song,Bingqian Yang,Handan Qiao,Yawei Yu,Yi Wang,Xiulan Hu
The key to direct methanol fuel cells (DMFCs) is the anode catalyst for methanol oxidation reaction (MOR) which has good catalytic activity and stability. Pt@CoO x @N-C catalysts were synthesized by compounding Pt nanoparticles and CoO x with nitrogen-doped porous carbon (N-C). Pt nanoparticles were prepared by solution plasma technique. CoO x @N-C are derived from zeolitic-imidazolate-framework-67 (ZIF-67) by heat treatment at 700 °C. For MOR, Pt@CoO x @N-C exhibits an outstanding electrocatalytic performance (mass activity of 2400 mA mg Pt −1 ) and stability (70% remained after 300 cycles) under acidic condition, which owing to the synergistic effects among the Pt nanoparticles , CoO x and nitrogen-doped porous carbon. Pt@CoO x @N-C shows such mass activity superior to that of Pt/C (460 mA mg Pt −1 ) due to the fact that CoO can adsorb –OH in the solution and then assist Pt to oxidize the CO-like intermediates to CO 2 which improves the resistance to CO poisoning of Pt nanoparticles . Therefore, solution plasma method assisted with metal-organic frameworks have good development prospects on synthesis of highly efficient electrocatalysts .
研究领域:
材料科学
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化学工程
✓ 已验证
DOI
高影响因子
Catalysis Science & Technology
·
2022
·Vol. 12
·期 7
·2257-2264
·
IF 6.177
Fei Zhang,Chunzheng Wu,Shuibo Wang,Shiwei Wang,Tong Li,Laixi Zou,Hongbo Yu,Hongfeng Yin
Although supported Rh nanoparticles (NPs) are one of the best catalysts for the selective hydrogenation of phenol to cyclohexanol, they still suffer from poor selectivity problems. In this study, we promoted the selectivity of Rh NPs with CoOx through an in situ transformation of the bimetallic RhCo NPs on SiO2. Among the obtained Rh–CoOx/SiO2 catalysts, the one with a Co/Rh molar ratio of 1/3 exhibited the highest phenol conversion (i.e., 98.1%) and the highest selectivity to cyclohexanol (i.e., 99.4%). Our study showed that CoOx promoters modified the electronic states of Rh and created new active sites at their interface, which are beneficial to the activation of phenol and the desorption of cyclohexanol. Excessive coverage of Rh by CoOx, however, would cause deactivation due to the less exposure of the Rh–CoOx interface.
研究领域:
催化
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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
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Li Sun,Zhili Qiao,Yuan Zhi,Hua Zhang,Binlin Dou,Yuejin Shan,Weijia Huang
Bulk noble metal–semiconductor composites can be chosen as photocatalysts to carry out the flow degradation of 4-nitrophenol (4-NP) whereas their preparation is complex and uncontrollable. Here, bulk Au-Co-CoO x -CeO x @iron ball (Au/Co-CC@iron ball) is designed and prepared by a facile and controllable route without any toxic chemical. The bulk Au/Co-CC@iron ball shows excellent photocatalytic activity and reusability for the 4-NP degradation, which can be ascribed to the synergistic action of active components and foliated iron ball surface. Furthermore, the highly active Au/Co-CC@iron ball is used as packing material to construct a new-type of packed reactor, by which the flow degradation of 4-NP is successfully achieved. As-fabricated packed reactor and its tandem module exhibit superior photocatalytic performance for the flow degradation of 4-NP. Noteworthy, based on the tandem module with six reactors, the removal rate of 4-NP can reach up to 2750 µmol/h. Meanwhile, the reactor and its module display satisfactory operational stability and reusability in the flow degradation of 4-NP. Clearly, the provided route is effective for the preparation of bulk noble metal–semiconductor composites with exceptional performance, which can also be a prospective strategy to obtain bulk packing materials to serve for the flow degradation.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2021
·Vol. 11
·期 9
·3039-3046
·
IF 6.119
Yuxiang Liu,Xuejun Xu,Shangchun Lv,Hewen Li,Zhichun Si,Xiaodong Wu,Rui Ran,Duan Weng
Aluminium doped strontium titanate, SrTiO3(Al), is considered as the most promising candidate photocatalyst for water splitting; however, it suffers from fast recombination of photogenerated charges and little photocatalytic activity for overall water splitting. Precious metals, such as RhCrOx, are always needed as cocatalysts to enhance the photocatalytic performance. Herein, nitrogen doped graphene quantum dots (NGQDs) were prepared and applied as a hydrogen evolution reaction (HER) cocatalyst of SrTiO3(Al)/CoOx for photocatalytic overall water splitting. The designed NGQDs/SrTiO3(Al)/CoOx is highly active for overall water splitting achieving a H2 evolution rate of 18.8 μmol h−1 and an O2 evolution rate of 9.0 μmol h−1, respectively. The NGQDs and CoOx are dispersed on the different crystal facets of octagonal SrTiO3(Al), which is beneficial to the spatial separation of photogenerated electrons and holes. The strong interaction between NGQDs and SrTiO3(Al) via Ti–O–C chemical bonds enhances the charge transfer and separation. Moreover, the pyrrole N species within NGQD networks act as active sites for the hydrogen evolution reaction.
研究领域:
材料科学
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化学
·
纳米技术
·
光催化
✓ 已验证
DOI
高影响因子
ACS Applied Engineering Materials
·
2025
·
IF 3.5
Yazhou Shuang,Fang Wang,Weihao Zhao,Hongkang Wang,Zelin Ma,Jie Jian,Shiyuan Wang,Jiulong Wang,Longyang Li,Pengfei Guo,Qian Ye,Fei Xu,Hongqiang Wang
Vanadium oxide (VOx)-based catalysts for propane (C3H8) dehydrogenation (PDH) demonstrate excellent redox properties due to the multivalent property of vanadium; however, the unsatisfactory catalytic efficiency and recondite catalytic mechanisms seriously restrict their widespread applications. Herein, we proposed the doping of cobalt oxide (CoOx) species into VOx supported on alumina for simultaneously facilitating the catalytic performance in PDH with (oxidative) and without CO2 (nonoxidative). The CoOx-doped VOx species are uniformly impregnated onto alumina supports through a ligand-free wet chemical impregnation method, without any additives. The results show that the CoOx doping modulates the electronic interactions between VOx species, thus increasing the reductive capability of the catalyst and mitigating the competitive absorption of CO2 with C3H8. Consequently, superior catalytic performances are achieved in both nonoxidative and CO2-oxidative PDH reactions compared to pristine VOx species without CoOx doping. Otherwise, the dry reforming of C3H8 is significantly inhibited compared to pristine CoOx species without VOx doping. Notably, a higher and impressive conversion rate up to 55.5% for target products (C3H6) is achieved in nonoxidative PDH compared to CO2-oxidative PDH on the CoOx-doped VOx catalyst, indicative of the competitive adsorption between reactants (CO2 and C3H8) during the catalytic process. This study provides a forward-looking mechanism to establish separate reaction pathways for each reactant (CO2 and C3H8) to improve mass transfer, thereby enhancing the efficiency of CO2-oxidative PDH.
研究领域:
催化化学
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化学工程
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材料科学
·
能量转换
·
多相催化
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Huiyu Liang,Ke Xiao,Liyan Wei,Bo Yang,Gang Yu,Shubo Deng,Huabo Duan,Caizhen Zhu,Juying Li,Junmin Zhang
A novel CuO-CeO 2 -CoO x nanocatalyst was prepared for heterogeneous Fenton-like reaction to break the Ni 2+ -chelate into free Ni 2+ in electroless nickel plating wastewater, followed by separation of Ni 2+ in an insoluble form. The composite nanocatalysts prepared by co-precipitation method were characterized by XRD, TEM, and XPS, et al. Its catalytic activity as Fenton-like reagent was evaluated by the removal efficiency of Ni(II)-citrate after decomplexation and postprecipitation treatment. Subsequently, the effects of operating parameters on the decomplexation efficiency of the nanocatalysts were investigated including calcination temperature of catalysts, H 2 O 2 concentration, catalyst dosage, initial pH and reaction temperature. Under optimized condition, the Ni(II)-citrate complexes ( C 0 = 1.0 mM) achieved the complete decomplexation (>99.9%) within 60-min reaction using 0.3 g/L of CuO-CeO 2 -CoO x calcined at 450 °C and 75 mM of H 2 O 2 at pH 3.0 under 50 °C of reaction. Then, Ni 2+ after decomplexation could be completely removed by the subsequent precipitation at pH 11.0. In addition, the life test of CuO-CeO 2 -CoO x catalyst indicated that, after recycled 10 times, its activity for decomplexation of Ni(II)-citrate decreased no more than 8%. As a result, this new heterogeneous Fenton-like process is promising for decomplexation and purification of electroless nickel plating wastewater as a sludge reduction technology.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Ting Yang,Zheng Chen,Ziqing Wang,Jiayuan Yu,Changjiu Xia,Hongxia Liu,Lei Liu,Xinxin Peng,Yibin Luo,Xingtian Shu
Disulfide is an important organic reagent and synthetic intermediate that is widely used in organic synthesis, polymers, and other fields, but its synthesis still suffers from many environmental pollution and economic problems. Here, we present an environmentally friendly and efficient base-free aerobic oxidative thiol coupling catalyzed by heterogeneous CoOx nanoclusters entrapped in hierarchical silicalite-1 zeolite, synthesized by combining silane pore expansion and metal coordination methods under hydrothermal conditions. It is confirmed that open hierarchical channels favor mass diffusion, and the chemical valence of Co species in CoOx/h-S-1-H is +2, which is different from that of Co3O4 particles in CoOx/h-S-1-I. CoOx nanoclusters, are strongly fixed in the channels of silicalite-1 zeolite via Co−O−Si bonds, which is of great importance for the high catalytic activity in both symmetrical and unsymmetrical oxidative thiol coupling reactions. After recycling experiments four times, the CoOx/h-S-1-H used has almost the same chemical state and the same distribution of Co(II) species as the fresh catalysts. Based on DFT calculations and inhibition experiments, the oxidative coupling of thiols undergoes a free radical mechanism in which Co(III) causes RS−H cleavage into RS· and H· species. Subsequently, two RS· radicals are coupled to disulfides, while H· radicals react with the O species to form H2O molecules. This work not only provides guidance on catalyst design and parameter optimization for oxidative thiol coupling but also advances the understanding of the aerobic oxidation mechanism.
研究领域:
催化
·
材料科学
·
有机化学
·
环境化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Jinchuan Chen,Zhe Han,Chuanqiang Sun,Feng Yang,Yujing Zhang,Huajie Xu,Chuntai Liu,Changyu Shen
It is a significant challenge to develop a fast carbon fiber (CF) surface modification method, especially for the high strength electromagnetic wave (EMW) absorption materials. Herein, magnetic CoO x nanoparticles are successfully synthesized and uniformly assembled on CF surface with high oxygen-containing groups by rapid ambient microwave carbon thermal shock (MCTS). The presence of oxygen defect sites on CF surface promotes CoO x nanoparticles nucleation. The number of oxygen defects and the types of magnetic nanoparticles on the CF surface effectively adjust the surface chemical activity and the electromagnetic properties of CF, which is conducive to improving the EMW absorption performance and interface compatibility of the CoOx nanoparticles modified CF reinforced polyamide 6 (CO@CF/PA6) composites. Compared with CO@CF-0 s/PA6, the tensile strength and modulus of [email protected] s/PA6 composite are increased by 18.1 % and 18.6 %, respectively. It also displays a minimum reflection loss value (−59.9 dB) at a thinner thickness of 1.9 mm while the maximum effective absorption bandwidth reaches 5.02 GHz with a thickness of 1.8 mm. Its radar cross-section values exhibit less than −10 dBm 2 at all tested detection angles. This rapid MCTS shows great potential for large-scale production of CF modification with low-cost, efficient and environmentally friendly process.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Jinming Feng,Jincheng Mu,Qiong Peng,Yang Xiao,Baojun Liu
Cobalt-based oxides have attracted extensive attention in heterogeneous catalytic peroxymonosulfate (PMS) activation towards emerging pollutants degradation, while the improvement of their catalytic performance is still a severe challenge. Herein, a CoO x ultrathin nanosheet composed of in situ interfacial Co 3 O 4 and CoO (CoO x -Ar-350) was synthesized and employed in PMS activation for micro-contaminates removal. The catalyst shows 100 % bisphenol A (BPA) conversion within 2 min ([BPA] = 20 mg/L, [Catalyst] = 20 mg/L, [PMS] = 200 mg/L) with a remarkable reaction rate of 2.69 min −1 , which is 3.84 and 2.66 times of pure Co 3 O 4 and CoO, respectively. Characterization and theoretical calculation results indicates that the interfacial synergy between Co 3 O 4 and CoO could modulate the adsorption behavior and enhance the electron acceptance of PMS, which boosts the breaking of O-O bonds and the generation of reactive oxygen species (ROS) and thereby the pollutant removal efficiency. The ROS quenching and capture experiments demonstrate that the enhanced OH and 1 O 2 play significant contribution during the degradation process. This work provides a novel in situ interfacial engineering for the development of highly efficient catalyst and reveals the activity enhancement mechanism for PMS activation.
研究领域:
环境科学
·
催化
·
水处理
✓ 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）