ENERGY & FUELS
·
2023
·
IF 5.3
Bin Kang,Runduo Zhang,Mengfei Guo,Xiaonan Guo,Zhaoying Di,Ying Wei,Jingbo Jia
In this study, series of Co/zeolites with diverse microporous structures were prepared and applied for N2O catalytic decomposition. The corresponding activities followed the order Co/Beta > Co/Mordenite > Co/ZSM-5 > Co/MCM-49 > Co/ZSM-23 > Co/ZSM-35 > Co/SSZ-13, while the yield of NO2 byproduct followed the order Co/ZSM-23 > Co/ZSM-35 > Co/MCM-49 > Co/Mordenite > Co/ZSM-5 > Co/Beta > Co/SSZ-13. Under conditions of 30 vol % N2O and GHSV = 30 000 h–1, the best performing sample (Co/beta) achieved a remarkable N2O conversion of 99.6% at 450 °C. In addition, the formation of NO2 byproduct was significantly inhibited with the corresponding concentration varying from 1063 ppm for Co/ZSM-23 to 82 ppm for Co/Beta. Physicochemical characterization of these as-prepared catalysts was performed including XRD, BET, H2-TPR, NH3-TPD, XPS, UV-vis-DRS, and it was found that zeolites with higher dimensionally porous apertures (3D) and larger pore sizes (12-membered ring, 12-MR) were conducive to introducing Co ions onto the zeolite framework through the pore channels and further locating them on ion-exchange sites to form active centers (Co2+). Furthermore, molecular dynamics simulation demonstrated that the higher pore dimensions and larger pore sizes are more beneficial for the N2O diffusion inside the pores and channels of zeolites and promote N2O decomposition.
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
THIN SOLID FILMS
·
2023
·
IF 2.1
Xinkuai He,Ruqing Guo,Qingtian Zou,Jingjing Yang,Zhousi Hu,Luye Wu
The co-deposition behavior of Co +2 and Fe +2 in ethylene glycol (EG) are investigated using cyclic voltammetry (CV) techniques. These results imply that Co +2 species can accelerate the Co-Fe co-deposition, while Fe +2 can inhibit the reduction of Co +2 . Moreover, the two effects can be improved as Co +2 or Fe +2 concentration increases. Microstructural and compositional characteristics of the samples show that Co-Fe deposits with various Fe content can be obtained from anhydrous FeCl 2 and CoCl 2 in EG. Scanning electron microscopy imaging of the surfaces of these Co-Fe alloy coatings shows that they present a dense structure with spherical “nodules”, the size of which is related to the Fe content. The electrocatalytic activity for hydrogen evolution reaction (HER) on the Co-Fe coatings is also investigated. These results indicate that its electrocatalytic activity can be improved as Fe contents increase from 2.2 to 9.8 wt.% and the Co-Fe alloy with 9.8 wt.% Fe exhibits the high electrocatalytic activity for HER with an overpotential of 124 mV at 10 mA cm −2 in 1 M KOH.
研究领域:
电化学
·
材料科学
·
催化
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Lingfei Luo,Huimin Yang,Xiang Li,Kechen Zhou,Lu Tang,Huiyu Su,Liyan Chen,Chaofan Ma,Xiaoxia Wang,Dawen Zeng
The inert gas adsorption of outer oxygen atoms is becoming an important factor limiting the gas sensing activity of two-dimensional MoO 3 nanoflowers, which makes it necessary to modify the surface activity of MoO 3 nanoflowers. For a long time, the unique activity of Co atoms has attracted much attention in gas sensing. In this work, Co metal sites were introduced into MoO 3 defective nanoflowers (MoO 3 DNFs) by doping, which further improved the H 2 S gas sensing performance of MoO 3 DNFs. Based on H 2 S gas sensing experiment, the relationship between Co doping amount and gas sensing performance was constructed, and the optimal Co doping ratio was obtained. Finally, the adsorption reaction process of H 2 S gas molecules on MoO 3 -Co DNFs was simulated by DFT calculation, and the activation effect of Co metal sites on outer oxygen atoms was revealed.
研究领域:
材料科学
·
传感器技术
·
表面化学
·
纳米结构材料
·
气体检测
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Xuanting He,Jihan Lu,Jiaxiang Liu,Zixuan Wu,Boyu Li,Zhong Chen,Wenquan Tao,Zhuo Li
Effectively addressing crude oil spills remains a global challenge due to its high viscosity and limited flow characteristics. In this study, we successfully prepared a modified sponge (PCP@MS) by embedding the photothermal material of Co-HHTP and coating the melamine sponge (MS) with low-surface-energy polydimethylsiloxane (PDMS). The PCP@MS exhibited outstanding hydrophobicity with WCA of 160.2° and high oil absorption capacity of 59–107 g/g. The PCP@MS showed high separation efficiency of 99.2% for various oil-water mixtures, along with notable self-cleaning properties and mechanical stability. The internal micro-nano hierarchical structure on the sponge surface significantly enhanced light absorption, synergizing with the photo-thermal conversion properties of Co-HHTP, enabled PCP@MS to achieve a surface temperature of 109.2 °C under 1.0 solar light within 300 s. With the aid of solar radiation, PCP@MS is able to heat up quickly and successfully lowering the viscosity of the surrounding crude oil, resulting in an oil recovery rate of 8.76 g/min. Density functional theory (DFT) calculation results revealed that Co-HHTP featured a zero-gap band structure, rendering advantageous electronic properties for full-wavelength light absorption. This in situ solar-heated absorbent design is poised to advance the practical application of viscous oil spill cleanup and recovery.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL PHYSICS LETTERS
·
2022
·
IF 2.719
Peng Yong,Sheng Wang,Xu Zhang,Haibo Pan,Shuifa Shen
Shape controlled preparation and doping are important means to improve the gas sensitivity of metal oxide semiconductor materials. In this work, pure and Co-doped In 2 O 3 porous hollow hexagonal cylinders were successfully prepared using metal–organic frameworks (MOFs) MIL-68(In) as self-sacrificial template. The size of the MIL-68(In) hexagonal cylinder is uniform, and the In 2 O 3 obtained after pyrolysis better inherits the shape of the MIL-68(In), but becomes hollow, and the cylinder surfaces are porous. The product has a large specific surface area (46.52 m 2 /g), and the doping of Co significantly increases the oxygen vacancy of the material. The Co-doped sample obtained by pyrolysis at 500℃ has excellent gas sensing performances to ethanol gas, its sensitivity to 100 ppm ethanol gas at 210 ℃ is 14.6, response/recovery time is 21 s and 107 s, and the sensing selectivity to ethanol is also good.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
Scientific Reports
·
2015
·Vol. 5
·期 1
·1-8
·
IF 5.578
Niu Xiaoyu,Zhao Tieying,Yuan Fulong,Zhu Yujun
The hollow CuO@SiO 2 spheres with a mean diameter of 240 nm and a thin shell layer of about 30 nm in thickness was synthesized using an inorganic SiO 2 shell coating on the surface of Cu@C composite that was prepared by a two-step hydrothermal method. The obtained hollow CuO@SiO 2 spheres were characterized by ICP-AES, nitrogen adsorption-desorption, SEM, TEM, XRD, H 2 -TPR, CO-TPR, CO-TPD and NO-TPD. The results revealed that the hollow CuO@SiO 2 spheres consist of CuO uniformly inserted into SiO 2 layer. The CuO@SiO 2 sample exhibits particular catalytic activities for CO oxidation and NO + CO reactions compared with CuO supported on SiO 2 (CuO/SiO 2 ). The higher catalytic activity is attributed to the special hollow shell structure that possesses much more highly dispersed CuO nanocluster that can be easy toward the CO and NO adsorption and the oxidation of CO on its surface.
研究领域:
材料化学
·
催化化学
·
纳米材料科学
·
环境催化
·
无机合成
✓ 已验证
DOI
高影响因子
Journal of Environmental Sciences
·
2025
·
IF 6.3
Menghe Lou,Li Xiang,Guo Nie,Xueqing Luo,Renna Li,Feng Bi,Xiaole Weng,Zhongbiao Wu
The removal of carbon monoxide (CO) from sintering flue gases remains a significant challenge in industrial gas purification, requiring efficient catalytic systems. This study explores the use of TiO 2 synthesized under supercritical conditions in copper-based catalysts for low-temperature CO oxidation. Experimental results showed enhanced catalytic activity, with complete CO conversion at 120°C, primarily due to a higher Cu⁺ concentration in the catalyst. Characterization techniques (XPS, EPR, CO-DRIFT) confirmed a substantial increase in the Cu⁺ ratio in Cu/sc-TiO 2 (78%) compared to Cu/TiO 2 (71%) before thermal treatment. Additionally, the Cu/sc-TiO 2 -A catalyst exhibited smaller particle size and better dispersion, which contributed to the elevated Cu⁺ ratio after preheating. Thermal treatment increased the Cu⁺ ratio by 11% in Cu/sc-TiO 2 -A, compared to just 3% in Cu/TiO 2 -A, leading to a final Cu⁺ ratio of 89%, which enhanced catalytic activity. DRIFT and TPSR analyses indicated that the Cu/sc-TiO 2 catalyst generated CO during heat treatment, creating a micro-reduction environment that optimized copper valence states and active sites. This study highlights the potential of continuous hydrothermal flow synthesis for modulating catalyst valence states in industrial applications.
研究领域:
材料科学
·
催化化学
·
环境工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL
·
2024
·
IF 6.7
Jia Shen,Chen Chen,Lichuan Song,Liding Zhong,Kai Shan,Yanglong Guo,Wangcheng Zhan,Yun Guo,Haifeng Wang,Li Wang
The anchoring effect between surface hydroxyls (–OH) and metal species has been extensively utilized to enhance catalyst stability. Nevertheless, few studies have investigated the impact of alloying process involving different types of –OH species. In this research, we discovered that the formation of the alloy particles Pt 3 Co was significantly influenced by the presence of distinct –OH species on Al 2 O 3 . Intriguingly, those Pt 3 Co alloy particles exclusively formed on α-Al 2 O 3 owing to the weak interaction between both Pt and Co species and the triply bridging hydroxyls (µ 3 -OH). In contrast, Pt and Co species were found to be separately dispersed on γ-Al 2 O 3 because of the strong anchoring effect of terminal hydroxyls (µ 1 -OH), especially for Co atoms. Density functional theory (DFT) calculations highlighted the difference in adsorption energies of the two metals on different hydroxyl groups, providing a theoretical rationale for the influence of hydroxyl groups on alloy formation. The presence of Pt 3 Co alloy resulted in a fourfold increase in the specific catalytic rate of Pt 3 Co/α-Al 2 O 3 in CO-PROX compared to Pt 3 Co/γ-Al 2 O 3 . Arguably for the first time, this study demonstrates the association between alloy formation and –OH groups, providing a unique perspective on the design of alloy catalysts.
研究领域:
催化化学
·
材料科学
·
理论计算化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2018
·Vol. 32
·期 12
·e4570
·
IF 3.581
Xiaobin Dong,Chaoyue Zhao,Qingxin Guan,Wei Li,Xiufang Xu
Industrial production of vinyl chloride through acetylene hydrochlorination is a dominating technique in coal-rich areas, but its development is severely restricted by the use of toxic mercury chloride (HgCl 2 ) catalyst. Inspired by the fact that doped carbon materials active in acetylene hydrochlorination often have good performance in the oxygen reduction reaction, a series of cobalt and nitrogen co-doped porous carbon catalysts prepared by pyrolysis of bimetallic ZIFs based on ZIF-8 and ZIF-67 under N 2 were applied in acetylene hydrochlorination. The catalytic activities of the co-doped catalysts varied with Co addition, and the highest acetylene conversion could be up to 83% with a space velocity of 2.6 ml g −1 min −1 at 220°C when a small amount of cobalt was introduced. Results of several characterizations confirmed the existence of Co–N x in the co-doped carbons, pointing out that this coordination structure makes the catalysts have better ability to adsorb and activate C 2 H 2 . Density functional theory calculation finally proved that C atom adjacent to the N atom in Co–N 4 structure is the primary active site in co-doped catalysts with high activity. We also conclude that the decreased N content caused by Co 2 N decomposition and the coordination structure change of Co–N x should be responsible for the gradually worsening performances of the carbon catalysts with further Co addition. Our study provides a new route for improving the performance of N-doped carbon material in acetylene hydrochlorination and thus enhances its potential for practical application.
研究领域:
化学工程
·
催化材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 15
·1-12
·
IF 2.8
Pan Yusong,Zhu Yuan,Wang Yuanqing,Huang Run,Pan Chengling
Based on the strong capability of transition metal ions for peroxymonosulfate (PMS) activation and highly affinity of MoS 2 towards PMS, thus decorating MoS 2 with transition metal ions would efficiently activate PMS for degradation of organic pollutants. In this work, Co/Fe co-doped MoS 2 catalyst were synthesized by simple chemical method. The prepared Co/Fe co-doped MoS 2 catalyst displayed excellent catalytic activity for organic pollutant degradation. The removal efficiency of RhB and MB is 99% in 6 min and 98% in 15 min under PMS system, respectively. Both the capture experiment and EPR results verified that 1 O 2 played an important role in the organic pollutant degradation process in PMS system. The catalytic mechanism revealed that the synergistic effect between Mo ion and Co/Fe ions is beneficial for boosting the catalytic properties of Co/Fe co-doped MoS 2 catalyst. The cycle experiments confirmed that Co/Fe co-doped MoS 2 possesses excellent chemical stability and re-usability.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Canyu Cui,Shihui Jiao,Wenwen Wang,Guangsheng Pang
It is essential to synthesize a versatile organic solvent/water separation material with excellent stability and durability. Superwetting materials, known for their multiple practical functionalities in everyday life and industrial production, have been receiving special concern for years. In this paper, the multifunctional superhydrophobic surface has been successfully prepared by coating polydimethylsiloxane (PDMS) onto three-dimensional nest-like Co-Ni layered double hydroxides (LDHs) using fabrics as a substrate (N Co-Ni LDHs/PDMS). The hierarchical nest-like structure of Co-Ni LDHs promotes the formation of abundant air cushions and enhances self-cleaning ability under liquid, which is beneficial to the efficient separation of organic solvent/water mixture. The results fabrics (superhydrophilic N Co-Ni LDHs and superhydrophobic N Co-Ni LDHs/PDMS) exhibit a high separation efficiency of 99.1 % and a flux of 11400 L m −2 h −1 for n-hexane, kerosene, cyclohexane, tetrachloroethylene and tetrachloromethane. The separation efficiency is above 99.0 % and flux is above 10200 L m −2 h −1 after 10 cycles of separation. The superhydrophobic N Co-Ni LDHs/PDMS can load 21 times its own weight and sail on water at a velocity of 60 cm s −1 . Additionally, the superhydrophobic fabrics display excellent chemical stability and mechanical durability. The as-fabricated fabrics are suitable for application in organic solvent/water separation.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 16
·3843
·
IF 4.2
Xinbao Li,Kai Sun,Ying Chen,Ye Yuan
As a widely used support, TiO2has often been combined with Pd to form highly sensitive gas-chromic materials. Herein, we prepared a series of Pd/TiO2catalysts with different Pd content (from 0.1 to 5 wt.%) by the impregnation method for their utilization in fast room-temperature CO detection. The detection was simply based on visible color change when the Pd/TiO2was exposed to CO. The sample with 1 wt.% Pd/TiO2presented an excellent CO gasochromic character, associated with a maximum chromatic aberration value of 90 before and after CO exposure. Systematic catalyst characterizations of XPS, FT-IR, CO-TPD, and N2adsorption–desorption and density functional theory calculations for the CO adsorption and charge transfer over the Pd and PdO surfaces were further carried out. It was found that the interaction between CO and the Pd surface was strong, associated with a large adsorption energy of −1.99 eV and charge transfer of 0.196e. The color change was caused by a reduction in Pd2+to metallic Pd0over the Pd/TiO2surface after CO exposure.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）