Catalysts
·
2023
·Vol. 13
·期 5
·800
·
IF 3.9
Zhong Xie,Jinpei Hei,Lei Cheng,Jing Li,Xiaojie Yin,Sugang Meng
CO2hydrogenation to methanol was conducted using a set of activated carbon-supported Cu/ZnO/Al2O3catalysts (CCZA) prepared by an incipient wetness impregnation approach. The effect of the Cu/Al ratio on the physicochemical properties of the catalysts, as well as their catalytic performance, were investigated. As Cu/Al ratio increased, the metallic Cu surface area displayed a reducing trend from 6.88 to 4.18 m2∙gcat−1, while the CO2adsorption capacity exhibited an increasing trend. Meanwhile, aluminum content will have an important effect on the catalysts’ reducibility and, thus, on their catalytic performance. The CCZA-2.7-de catalyst demonstrated the highest selectivity to methanol at 83.75% due to the excellent distribution and synergistic effect of copper and zinc. Although the CO2conversion of CCZA-2.2-de and CCZA-3.5-de exceeded 10%, the CH3OH selectivity was less than 60%, which may be attributed to the larger particle sizes of ZnO and poor interactions in Cu–Zn. The present study offers a novel approach to increase the number of active sites, optimize the activated carbon-aided Cu/ZnO/Al2O3catalyst’s composition, and finally elucidate the mechanism for CO2hydrogenation to methanol.Keywords:CO2hydrogenation;CuO/ZnO/Al2O3catalyst;methanol synthesis;carbon-supported catalyst;thermocatalysis
研究领域:
催化
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化学工程
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环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Bosen Lei,Ge Wang,Caiyong Li,Qikui Fan,Zhimao Yang,Yong Li,Cheng Zhou,Chuncai Kong
Complex preparation process and long annealing time of high-entropy metal oxide (HEO) limit its extensive application as microwave absorber at civil and military fields. Herein, a rapid synthesis method of mesocarbon microbeads (MCMB)-loaded spinel structure (FeCoCrNiMnCu)O is studied via plasma flow. In the presence of extreme plasma heating rate, a nanoscale high-entropy phase can be formed while modifying the surface activity of carbon. Simultaneously, due to the short synthesis time, gaseous conversion of carbon under high temperature aerobic conditions is avoided. By appending of carbon, the dual-media absorber exhibits better absorption performance with a maximum peak (-44.7 dB), which achieves over 90 % absorption in 11.2–15.5 GHz with a thickness of only 1.9 mm. Interestingly, the real and imaginary parts of complex permittivity increase remarkably. The former change is attributed to the expansion of heterogeneous hole carrier region and the latter dues to the interfacial polarization of the strongly coupled interface. The increase of dielectric loss and conductance loss leads to great improvement of microwave absorption. Our study injects new vitality into the preparation of HEO for advanced applications and the as-prepared HEOM is promised to be high-efficient microwave absorber based on robust stability and excellent absorbing performance.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
PHYSICS AND CHEMISTRY OF LIQUIDS
·
2024
·
IF 1.2
Shuting Wang,Xueli Zhou,Qingyuan Song,Yuhuan Chen,Fang Yang
In this work, the densities of CO2-loaded and unloaded alkanolamine (1) + N, N-dimethylacetamide (DMAC) (2) mixtures were determined at temperature of (288.15 to 323.15) K and 101 kPa. The alkanolamines were primary amines, 3-amino-1-propanol (3A1P) and 1-amino-2-propanol (1A2P), and tertiary amine, 3-dimethylamino-1-propanol (3DMA1P). There CO2-unloaded 3A1P/1A2P/3DMA1P + DMAC binary systems with the whole concentration and two CO2-loaded 3A1P/1A2P + DMAC systems with alkanolamine mass fraction of (0.2, 0.3 and 0.4) were investigated. Based on the density values of CO2-unloaded binary systems, the thermal expansion coefficient (αp), excess molar volume (VmE), and apparent molar volume (Vφ,i) were calculated and discussed in terms of intermolecular interactions and spatial structure. The VmE values were positive under the studied conditions and increased with the temperature, and the maximum followed the decreasing order of 1A2P + DMAC > 3DMA1P + DMAC > 3A1P + DMAC. Additionally, the VmE data were well fitted with the Redlich-Kister equation with a small standard deviation (σ ≤ 0.024). For the CO2-loaded systems, the density values were correlated with temperature and concentration using different empirical equations, and the average relative deviations (ARD%) were less than 0.299%.
研究领域:
化学热力学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2024
·
IF 4.1
Ying Xie,Xijie Cheng,Wei Yang,Chenyu Yan,Shengji Wu
Ammonia synthesis via electrocatalytic reduction of nitrate is a promising approach for green ammonia production. However, this process limited by multiple reaction pathways and NO 3 − adsorption over electrocatalyst surface. Herein, copper-iron bimetallic catalysts with different atom ratios of Cu/Fe (Cu/Fe = 10/0, 7/3, 5/5, 3/7 and 0/10) and activated carbon as supporter (CuFeO x /AC) were synthesized through hydrothermal co-precipitation method for catalytic reduction of nitrate. Synergistic effects between the Cu and Fe were observed in the copper-iron bimetallic catalysts and an appropriate atom proportion of Cu/Fe was benefit to accelerate the adsorption and electrocatalytic kinetics of nitrate reduction to *NO 2 and *NO 2 hydrogenation to·NH 3 through electron redistribution. The catalyst of 7Cu3FeO x /AC presented the best catalytic performance in nitrogen electroreduction reaction for ammonia synthesis, with an NH 3 yield rate of 2091 μg h −1 mg cat −1 and a faradaic efficiency of 76 % at −0.8 V vs. reversible hydrogen electrode. The 7Cu3FeO x /AC also exhibited excellent cycle ability and long-term durability whose NH 3 yield rates maintained as high as 1476 and 2326 μg h −1 mg cat −1 after 9 cycles and 10 h durability measurement, respectively. The nitrate reduction behavior over 7Cu3FeO x /AC proceeded with a series of deoxygenation reactions as follows: NO 3 − → *NO 3 → *NO 2 → *NO → *NOH → *NH 2 OH →·NH 3 . With the above excellent properties, the 7Cu3FeO x /AC may prove to be a promising electrocatalyst for ammonia synthesis via nitrogen electroreduction reaction.
研究领域:
化学工程
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材料科学
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环境科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2018
·
IF 4.229
Jiaqin Chen,Min Hu,Mei Ming,Caili Xu,Yi Wang,Yun Zhang,Jiangtao Wu,Daojiang Gao,Jian Bi,Guangyin Fan
Hydrogen generation from the hydrolysis of ammonia borane (AB) over heterogeneous catalysts is essential for practical applications. Herein, efficient hydrogen evolution from AB hydrolysis over the carbon-supported Rh nanoparticles synthesized with sodium citrate (Rh/C-SC) was achieved at 25 °C. The turnover frequency value of Rh/C-SC was 336 mol H 2 (mol Rh min) −1 , whereas that of Rh/C catalyst only yielded a value of 134 mol H 2 (mol Rh min) −1 . The improvement of the catalytic performance of Rh/C-SC catalyst could be attributed to the small Rh particles with highly active surface areas, which were prepared by using sodium citrate as the stabilizing agent. This result indicates that sodium citrate can be applied as a useful stabilizing agent for synthesizing active metal nanoparticles , thus highly promoting the practical application of AB system for fuel cells.
研究领域:
化学
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材料科学
·
能源研究
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2025
·
IF 6.5
Weidong Liu,Jianguo Liu
Benzylamine production from the hydrogenation of nitrile is attractive, but most of the catalysts are complicated and costly. In this paper, a simple synthesis of self-nitrogen-doped carbon-supported nickel biobased sustainable catalyst (Ni-JKS-600) for benzylamine hydrogenation with benzonitrile has been reported. The catalyst has high specific surface area, abundant micro-mesoporous structure and nickel hydrogenation active site. By optimizing the reaction conditions, a mild reaction condition (120 ℃, 2 MPa H 2 , 3 h) was determined, and it was found that the solvent had a significant effect on the selectivity of benzylamine, and the selectivity of benzylamine could reach 97.08 % when ammonia methanol was used as the solvent. Ni-JKS-600 catalyst is superior to precious metal catalysts (Ru, Pt, Ir, Pd) in aniline selectivity, and is comparable to Raney nickel catalyst, which shows its potential application in industrial production of amines. The catalyst uses cheap and widely available chitin as carbon and nitrogen source, and has the characteristics of green economy with simple preparation method and low cost. It is expected to replace precious metal catalyst for efficient production of benzylamine in the future.
研究领域:
催化化学
·
绿色化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2019
·
IF 2.29
Kun Fu,Pan Zhang,Dong Fu
The viscosities ( η ) of CO 2 -loaded 3-(dimethylamino)propan-1-ol (3DMA1P) aqueous solutions, CO 2 -unloaded and CO 2 -loaded 2-(ethylamino)ethanol (EAE)- 3DMA1P aqueous solutions were measured by using the NDJ-5S rotational viscometer . The temperature ranged from 303.2 K to 323.2 K. The mass fractions of 3DMA1P and EAE ranged from 0.3 to 0.5 and 0.01 to 0.03 respectively. The Weiland equation was used to model the viscosity and the calculated results agreed well with the experimental results. The effects of mass fractions of amines ( w ), temperature ( T ) and CO 2 loading ( α ) on viscosity were demonstrated on the basis of experiments and calculations.
研究领域:
化学工程
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
Chemistry-An Asian Journal
·
2020
·Vol. 15
·期 14
·2153-2159
·
IF 4.056
Zhihong Zhuang,Yicheng Zhang,Liang Hu,Hangjun Ying,Weiqiang Han
Graphical A thiol-assisted one-pot method by using 3-mercaptopropionic acid (MPA) to synthesize carbon-supported metal nanoparticles catalysts for efficient electrocatalytic reduction of carbon dioxide (CO 2 RR) has been reported. The synthesized Au−MPA/C catalyst achieves a FE CO of 96.2% with a CO current density of −11.4 mA/cm 2 , which is much higher than that over Au foil or MPA-free Au/C. The typical preparation route of carbon-supported metallic catalyst is complex and uneconomical. Herein, we reported a thiol-assisted one-pot method by using 3-mercaptopropionic acid (MPA) to synthesize carbon-supported metal nanoparticles catalysts for efficient electrocatalytic reduction of carbon dioxide (CO 2 RR). We found that the synthesized Au−MPA/C catalyst achieves a maximum CO faradaic efficiency (FE) of 96.2% with its partial current density of −11.4 mA/cm 2 , which is much higher than that over Au foil or MPA-free carbon-supported Au (Au/C). The performance improvement in CO 2 RR over the catalyst is probably derived from the good dispersion of Au nanoparticles and the surface modification of the catalyst caused by the specific interaction between Au nanoparticles and MPA. This thiol-assisted method can be also extended to synthesize Ag−MPA/C with enhanced CO 2 RR performance.
研究领域:
材料科学
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电化学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POWDER TECHNOLOGY
·
2020
·
IF 4.142
Jian-Rong Li,Feng-Kang Wang,Chi He,Cenyan Huang,Hang Xiao
A series of carbon-supported Cu Co oxide catalysts (Cu-Co/C) were prepared via the combination methods of impregnation and pyrolysis using Co-doped Cu-based metal organic framework (Cu 3 (BTC) 2 ·3H 2 O, Cu-BTC) precursor. Physicochemical properties of prepared catalysts were characterized by using various technologies and toluene was chosen as the probe molecule to evaluate their catalytic performance. Results revealed that the successive calcination in Ar and air was conducive to the formation of 3D porous carbon matrix and homogeneous elemental dispersion. The Cu-Co/C catalysts with spinel structure exhibited higher catalytic activity than that of Cu-500/C material. Moreover, CuCo 0.5 /C material exhibited superior catalytic durability and water resistance in catalytic oxidation of toluene. The excellent catalytic performance of CuCo 0.5 /C was mainly related to large specific surface area, high amounts of surface chemisorbed active oxygen and high ratio of Co 2+ /Co 3+ .
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Jing-Jing Luo,Ming-Shuai Sun,Boyuan Tang,Yan Zhou,Wen-Ting Chen,Wen-Qiang Gong,Song Han,Fei-Feng Mao,Zhang-Min Li,Duan-Jian Tao
Solvent-controlled hydrogenation of vanillin to 4-hydroxymethyl-2-methoxyphenol (HMP) or 2-methoxy-4-methylphenol (MMP) is an attractive topic in the field of bio-oil utilization. Herein, a nickel-based catalyst supported on a N-doped carbon material (Ni-N-C) was prepared by facile ball milling mixing and subsequent high-temperature calcination. The as-prepared Ni-N-C800 catalyst showed more than 99% MMP yield and good stability using pure H2O as a solvent under the given conditions. By using the mixed solvent H2O/ethyl acetate with a volume ratio of 1:5, the hydrogenation was conveniently tuned to produce the intermediate product HMP. Density functional theory (DFT) calculations further showed that the intermolecular forces of HMP interacting with ethyl acetate were much stronger than those interacting with H2O. Ethyl acetate could raise the energy barrier to keep vanillin hydrogenation in the intermediate HMP stage, and H2O reduced the energy barrier to accelerate the final product MMP formation.
研究领域:
催化化学
·
可再生资源利用
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 21
·14554-14564
·
IF 3.9
Zhong Xie,Jinpei Hei,Chuan Li,Xiaojie Yin,Fengyi Wu,Lei Cheng,Sugang Meng
An activated carbon-supported Cu/ZnO catalyst (CCZ-AE-ox) was successfully obtained by the ammonia evaporation method for the hydrogenation of carbon dioxide to methanol, and the surface properties of the catalyst post-calcination and reduction were investigated. Activated carbon facilitated the increased dispersion of the loaded metals, which promote the CO2 space-time yield (STY) of methanol and turnover frequency (TOF) on the active sites. Furthermore, the factors affecting the catalyst in the hydrogenation of CO2 to methanol were in-depth investigated. The larger surface area and higher CO2 adsorption capacity are found to make possible the main attributions of the superior activity of the CCZ-AE-ox catalyst.
研究领域:
催化
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化学工程
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Krishnamoorthy Rajavel,Xuecheng Yu,Pengli Zhu,Yougen Hu,Rong Sun,Chingping Wong
Defect-controlled exfoliation of few-layer transition-metal carbide (f-Ti3C2Tx) MXene was demonstrated by optimizing chemical etching conditions, and electromagnetic interference (EMI) shielding coatings were explored. The structural features such as layer morphology, lateral size, layer thickness, defect density, and mechanical stability of the exfoliated f-Ti3C2Tx were strongly dependent on exfoliation conditions. By selecting appropriate exfoliation conditions, moderate etching time leads to the formation of quality f-Ti3C2Tx with lesser defects, whereas longer etching time can break the layer structure and increase defect density, structural misalignment, and oxidative products of f-Ti3C2Tx. The resultant fabricated free-standing flexible f-Ti3C2Tx films exhibited electrical conductivity and electromagnetic interference (EMI) shielding effectiveness (SE) in the X-band of about 3669 ± 33 S/m and 31.97 dB, respectively, at a thickness of 6 μm. The large discrepancy in EMI SE performance between quality (31.97 dB) and defected (3.164 dB) f-Ti3C2Tx sheets is attributed to interconnections between f-Ti3C2Tx nanolaminates interrupted by defects and oxidative products, influencing EMI attenuation ability. Furthermore, the demonstrated solution-processable high-quality f-Ti3C2Tx inks are compatible and, when applied for EM barrier coating on various substrates, including paper, cellulose fabric, and PTFE membranes, exhibited significant EMI shielding performance. Moreover, controlling defects in f-Ti3C2Tx and assembly of heterogeneous disordered carbon-loaded TiO2–Ti3C2Tx ternary hybrid nanostructures from f-Ti3C2Tx by tuning etching conditions could play an enormous role in energy and environmental applications.
研究领域:
材料科学
·
电磁干扰屏蔽
·
纳米技术
·
涂层技术
✓ 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）