ChemCatChem
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2023
·Vol. 15
·期 7
·e202201687
·
IF 4.5
Wenjing Xu,Yingying Cheng,Jing Hou,Peng Kang
Graphical Mesoporous TiO 2 spheres with large specific surface area were synthesized by a simple two-step method for the electrocatalytic reduction of oxalic acid. The maximum Faradaic efficiency for glycolic acid reached 73.9 % at −0.5 V at ambient temperature, exceeding most recently reported results. Reducing oxalic acid to glycolic acid electrochemically remains a significant challenge due to the high overpotential and low selectivity and stability. This study uses mesoporous TiO 2 spheres of anatase phase as catalysts to reduce oxalic acid to glycolic acid with low overpotential. The maximum Faradaic efficiency of glycolic acid reaches 73.9 % at −0.5 V vs RHE. The mesoporous structure not only increases the specific surface area, but also limits the escape of intermediate glyoxalic acid from the catalyst surface due to the space-limiting effect of the mesoporous channel, such that oxalic acid can be deeply reduced to glycolic acid. Moreover, a mechanism for oxalic acid reduction is proposed, and the Ti 3+ /Ti 4+ redox pair plays an important role in the reduction of oxalic acid.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
POLYHEDRON
·
2017
·
IF 1.926
Fugen Yuan,Zhanghai Gu,Li Li,Lin Sha
The reaction of Ce(O t Bu) 2 (NO 3 ) 2 , prepared in situ from (NH 4 ) 2 Ce(NO 3 ) 6 and t BuONa in a 1:4 M ratio in THF, and N -phenyldiethanolamine (C 6 H 5 )N(CH 2 CH 2 OH) 2 in a 1:1 M ratio led to a brown solution, to which 1,10-phenanthroline (phen) was added. Yellow crystals of Ce(NO 3 ) 3 (phen) 2 and red crystals of Ce 13 O 8 [(OCH 2 CH 2 ) 2 N(C 6 H 5 )] 18 ( 1 ) were produced respectively at 40 °C. Complex 1 is a novel polynuclear cerium(IV)-diolate compound with an 18 N-phenylaminediethanolate shell and a 13-nuclear cerium(IV)-oxo core. It catalyzed the polymerization of ε -caprolactone (CL) to produce PCL in very narrow molecular weight distribution.
研究领域:
无机化学
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材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2013
·
IF 3.473
Kuan Huang,Yong-Le Chen,Xiao-Min Zhang,Shuang Xia,You-Ting Wu,Xing-Bang Hu
Two new simple acid salt ionic liquids (ASILs), tetraethylammonium diglutarate ([N 2222 ][diglutarate]) and dimethylethanolammonium diglutarate ([DMEA][diglutarate]) were synthesized and the ASILs/sulfolane binary mixtures containing 40 wt% ASILs were prepared for SO 2 absorption in this work. The SO 2 absorption rate is found to be quite fast with an equilibrium time within 2 min, due to the low viscosity of the mixtures. The solubilities of SO 2 in the two binary mixtures were measured under the pressure range of 0–1 bar and the temperature range of 303.15–333.15 K and results demonstrate the binary mixtures could trap as much as 6.836–7.624 mol SO 2 /kg absorbents at 1 bar and 303.15 K. The solubilities are 0.826–0.954 mol SO 2 /kg absorbents at a pressure as low as 0.004 bar, which is important for capturing SO 2 from the flue gas with low content of SO 2 . Thermodynamic analysis based on a Reaction Equilibrium Thermodynamic Model (RETM) was used to calculate the Henry’s law constants, reaction equilibrium constants, chemical absorption capacity, physical absorption capacity and thermodynamic functions of SO 2 absorption in the mixtures. The calculated absorption enthalpy are −53.73 and −47.15 kJ/mol for the two binary mixtures, respectively. The ASILs/sulfolane binary mixtures are shown to be an attractive alternative to pure ILs to be applied in SO 2 absorption due to the large absorption capacity and low absorption enthalpy, as well as the fast absorption rate.
研究领域:
环境科学
·
化学工程
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产品关联
DOI
高影响因子
Molecular Catalysis
·
2024
·
IF 3.9
Menghan Guo,Jie Ding,Guojing Ji,Tian Xie,Huiwen Pang,Xiang Li,Qin Zhong
Ethyl glycolate (EGly) is a platform molecule in various fields, which has been widely applied for the production of various valuable chemicals. Despite being a traditional catalyst for the conversion of diethyl oxalate (DEO) to EGly, Ag/SiO 2 catalyst exhibits insufficient activity. The present study introduces a novel preparation method that couples H 2 O 2 reduction with deposition precipitation to augment the performance of the catalyst. Performance results show that Ag/SiO 2 catalyst prepared by the new method attains a DEO conversion of 95.6% and an EGly selectivity of 78.0%, showing respective improvements of 10.0 and 15.2% over excess impregnation-evaporating solvent method. Characterization results show that the average silver particles size of Ag/SiO 2 catalyst prepared by the new method is 6 nm, which is 1/2 of the excess impregnation-evaporation solvent method. Simultaneously, it contains a greater quantity of Ag 0 . The smaller and more uniform particles offer greater active site density, leading to enhanced DEO conversion. An increased presence of Ag 0 diminishes DEO overactivation and inhibits the dissociative adsorption of H 2 . Moreover, the amplified quantity of Ag 0 could be attributed to the reduced interfacial charge transport triggered by metal-support interactions (MSIs).
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
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Kaiyang Xu,Chenyue Zhang,Lu Yang,Yaowen Xu,Binwen Zeng,Qian Chen,Bowen Li,Yang Zhao,Zhipeng Yu,Haoliang Huang,Wenlong Wang,Lecheng Liang,Shuqin Song,Lifeng Liu
Hybrid water electrolysis represents apromising approach for energy-efficient hydrogen (H 2 ) production. Herein, a highly active and selective electrocatalyst is reported for formaldehyde oxidation reaction (FOR), comprised of electrochemically deoxygenated copper nanosheet arrays supported on copper foam (D O -Cu-NS/CF). Comprehensive in-situ and ex-situ characterization confirms the formation of a Cu-rich, defect-abundant surface during deoxygenation. Using solid paraformaldehyde (p-HCHO) as anodic feedstock, D O -Cu-NS/CF achieves remarkable current densities of 500 and 963.3 mA cm −2 at low potentials of merely 0.199 and 0.495 V versus RHE, respectively. Theoretical simulations demonstrate that p-HCHO exists primarily as methane diolate anions (MDA) in alkaline media, and the lattice distortion in D O -Cu-NS/CF significantly enhances MDA adsorption and oxidative dehydrogenation, leading to outstanding FOR performance. A membrane electrode assembly (MEA) utilizing D O -Cu-NS/CF as the anode enables efficient bipolar H 2 production at 0.7 V for 280 h with a current density up to 500 mA cm −2 . This work highlights the crucial role of lattice engineering inenhancing FOR activity and offers new insights into the electrooxidation process of p-HCHO. The D O -Cu-NS/CF electrode developed shows significant potential for use as a cost-effective anode for energy-saving, high-rate production of H 2 through hybrid water electrolysis.
研究领域:
电化学
·
能量转换
·
材料科学
·
纳米技术
·
催化
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Fengling Zheng,Jiang Gong,Hanqing Zhang,Weihan Shu,Xue Wang,Siqian Qin,Chuancai Zhang,Bin Dai
The Co-Ag x /TiO 2 catalysts with low mass content of Co and Ag were synthesized through the impregnation method and investigated for dimethyl oxalate (DMO) hydrogenation to methyl glycolate (MG). Remarkably, the Co-Ag 0.7 /TiO 2 catalyst with an Ag concentration of 0.7 wt%, exhibited an impressive yield of MG of ∼94.4 %, surpassing the yields of MG obtained with Co/TiO 2 (∼54 %) and Ag 0.7 /TiO 2 (∼69 %) catalysts. Various characterizations elucidated that the exceptional catalytic performance of Co-Ag 0.7 /TiO 2 can be ascribed to the synergy between Co and Ag, resulting in the formation of AgCoO 2 as high active site can improve the adsorption and activation of DMO and H 2 on catalyst surface. Additionally, the doping of a small amount of Ag regulated the contents of Lewis acidic and Brønsted acidic sites, leading to a high conversion of DMO and selectivity of MG. Furthermore, the excellent MG yield and long-term stability (at least 200 h) facilely obtained over our catalyst under mild reaction conditions guarantee a feasible prospect in the industrial application. This study not only unraveled the superior performance of the Co-Ag synergistic catalyst, but also carried significant implications for developing catalysts with low-content in DMO hydrogenation to MG.
研究领域:
催化
·
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
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