Journal of Cleaner Production
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2021
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IF 9.297
Yi-Tong Wang,Di Gao,Ya-Nan Zeng,Jun-Guo Li,Ai-Min Ji,Tian-Ji Liu,Shuang Cai,Wen-Jie Cong,Fu-Ping Wang,Qing Yu,Xiao-Man Wang,Zhen Fang
Solid catalyst (Na 2 CO 3 @EFD) was prepared by wet impregnation of electric furnace dust (EFD) in aqueous Na 2 CO 3 solution. It had high basicity and acidity of 0.34 and 0.16 mmol/g for biodiesel production. High biodiesel yield of 99.8 wt% from soybean oil was obtained under the optimized reaction conditions (by Central Composite Design) of 71 °C in 111.36 min with 5.4 wt% catalyst and methanol/oil molar ratio of 11.8/1. After 11 cycles, biodiesel yield still maintained at 90.8 wt% with catalyst recovery rate >90 wt% by magnetic separation of catalyst EFD powders (containing Fe 3 O 4 with magnetism of 59.1 Am 2 /kg). Pure Na 2 CO 3 particles presented poorer recyclability with lower biodiesel yield of 89.5 wt% even at the eighth cycle by centrifugal separation . Na 2 CO 3 @EFD catalyst had high activity and recyclability because: (i) EFD as support hosted nanoparticles of Na 2 CO 3 (30.3 nm) as main base site for transesterification ; (ii) porous EFD support provided acidic sites from metal oxides (e.g., ZnO and Al 2 O 3 ) for esterification; (iii) EFD adsorbed active components into its micropores to maintain high recyclability; and (iv) EFD magnetism from magnetic Fe 3 O 4 kept high efficient magnetic separation. Total metals in the blended biodiesel met the National Standard of China and heavy metals were lower than typical petrochemical diesel . The study gave a practical use of industrial solid waste for the green production of biodiesel.
研究领域:
化学工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Bin Meng,Erping Cao,Liwei Jia,Yuhua Zheng,Yanbin Cui
A variety of Cu-Fe oxide supported on Na 2 CO 3 -modified activated carbon (CuFeNaAC-X) catalysts were prepared via the impregnation and calcination methods and their desulfurization performance was evaluated at low-temperature. By optimizing the loading content of Cu-Fe, the sulfur capacity of the CuFeNaAC-5 reached a maximum of 430.09 mg/g, surpassing most activated carbon (AC) catalysts. EPR testing revealed that the loading of Cu-Fe oxide can activate oxygen to form superoxide radicals ( O 2 - ·), thereby promoting the catalytic oxidation of H 2 S. XPS testing revealed that upon loading of Cu-Fe oxide, the formation of FeOOH can facilitate the catalytic oxidation of H 2 S to sulfur (S) through a chain reaction. Combining EPR and XPS analyses, Na 2 CO 3 modification modulates the content of O 2 - ·, directing the formation of S and then significantly improving the catalyst’s desulfurization efficiency. Furthermore, CO 2 -TPD testing revealed that Na 2 CO 3 modification promotes the ionization of H 2 S to HS - , thereby enhancing the catalyst’s desulfurization performance. Based on the distribution of sulfur species in used catalysts, and the results of characterizations, a possible desulfurization mechanism of CuFeNaAC-X has been proposed.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
ENERGY
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2025
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IF 9.4
Da Cui,Peng Zhang,Shuang Wu,Hon Man Luk,Yixi Wu,Bin Liu,Shuo Pan,Jingru Bai,Qing Wang,Xuehua Zhang
Oil shale has garnered significant attention as a supplementary energy source to traditional fossil fuels. In this study, we investigated the catalytic hydrothermal liquefaction (HTL) of shale oil sludge using three catalysts (Fe, Na 2 CO 3 , Ni/Al 2 O 3 ) and three combinations in pairs. The hydrothermal oil (HTO) yield, energy recovery (ER), and conversion rate (CR) of organic matters were comprehensively analyzed under six catalyst conditions. Both Fe + Na 2 CO 3 and Fe + Ni/Al 2 O 3 paired catalyst combinations achieved similar HTO yields of 28.43 % and 28.13 % along with ER values of 56.19 % and 57.94 % respectively. Moreover, these two groups achieved remarkably high CR values of 81.88 % and 81.02 %, respectively. The HTO from the Fe + Ni/Al 2 O 3 combination has the highest H/C ratio and the lowest O/C ratio at 1.682 and 0.032, respectively. Elemental composition, Fourier transform infrared spectroscopy (FT-IR), and gas chromatography-mass spectrometry (GC-MS) analyses of HTO were conducted in this study. The HTO produced by using Fe + Ni/Al 2 O 3 exhibited the most ideal distillation distribution, with fractions below diesel accounting for up to 96.94 %. Based on the catalytic functions of Fe, Ni, and Al 2 O 3 , six potential synergistic mechanisms of Fe + Ni/Al 2 O 3 were summarized. These mechanisms highlighted Fe + Ni/Al 2 O 3 's roles in promoting compound conversion pathways in HTO, ultimately revealing the synergistic catalytic mechanism.
研究领域:
能源化学
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催化科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHYSICAL CHEMISTRY B
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2023
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IF 3.3
Kai Guo,Xiaoya Liu,Ling Du,Yuling Lü,Xiaoming Luo,Xiao Ling
Electromagnetic synergy is a more effective physical method than a single AC electric field (ACEF) to enhance oil–water separation. However, the electrocoalescence behavior of droplets dispersed with salt ions in oil under the synergistic electromagnetic field (EMSF) still lacks research. Herein, the evolution coefficient of liquid bridge diameter (C1) characterizes the growth rate of the liquid bridge diameter, a series of Na2CO3-dispersed droplets with different ionic strengths were prepared, and C1 values of droplets under ACEF and EMSF were compared. Micro high-speed experiments revealed that C1 under ACEF is larger than C1 under EMSF. In particular, when σ = 100 μS·cm–1and E = 629.73 kV·m–1, C1 under the ACEF is 15% larger than C1 under EMSF. Additionally, the theory of ion enrichment is put forward, which explains the influence of salt ions on ζ potential and total surface potential in EMSF. This study provides guidance for designing high-performance devices by introducing electromagnetic synergy in water-in-oil emulsion treatment.
研究领域:
化学工程
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环境科学
✓ 已验证
DOI
高影响因子
Journal of Energy Storage
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2022
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IF 8.907
Yixiu Xin,Hongen Nian,Xiang Li,Beifeng Zhang,Xiaoling Tan,Jinhong Li,Yongquan Zhou
Structures of matrix channels are essential in the thermal performances of form-stable composite phase change material (fs-CPCM). As the special matrix in fs-CPCM, the expanded graphite (EG) has abundant pores and excellent thermal conduction channels, but it shows poor hydrophilia. In this study, the different dimensional NiCo 2 O 4 was selected to regulate controllably the microstructure of EG channels. Three kinds of NiCo 2 O 4 with one dimensional (1D) pine-needle-like, two dimensional (2D) honeycomb-like and three dimensional (3D) flower-like were used to modify EG (N-EG). A series of novel Na 2 CO 3 ·10H 2 O-Na 2 HPO 4 ·12H 2 O eutectic hydrated salt (EHS)/N-EG fs-CPCM with enhanced heat transfer and excellent thermal stability was developed. It was found that the 3D flower-like N-EG fs-CPCM possessed outstanding chemical compatibility, high latent heat (173.21 J/g), enhanced thermal conductivity (5.52 W/m·K), and great thermal reliability (−0.06 wt% weight loss). This work provides new insights that the matrix with 3D pore structures could be applied to encapsulate EHS, which is beneficial to obtain fs-CPCM with superior thermal properties.
研究领域:
材料科学
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热能工程
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复合材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2016
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IF 3.014
Yan Yuan,Junxiang Wang,Zongqian Hu,Haiping Lei,Donghua Tian,Shuqiang Jiao
A Prussian blue analogue, Na 2 Co 3 [Fe(CN) 6 ] 2 , has been fabricated by a facile co-precipitation method at room temperature as a potential cathode material for both lithium-ion and sodium-ion batteries. It found that the Na 2 Co 3 [Fe(CN) 6 ] 2 nanoparticles with a primary particle size of 30–40 nm have been synthesized, and exhibited an excellent electrochemical performance , including a long cycling behavior in lithium-ion batteries and a good rate performance in sodium-ion batteries. In lithium-ion batteries, the Na 2 Co 3 [Fe(CN) 6 ] 2 nanoparticles cathode can deliver an excellent cyclic performance with 73.0% retention of initial capacity after 50 cycles at 50 mA g −1 . Moreover, when Na 2 Co 3 [Fe(CN) 6 ] 2 is used as cathode material of sodium-ion batteries, it exhibits an outstanding rate performance exceeding 75.2% retention of initial capacity after 50 cycles at 200 mA g −1 . Therefore, the Na 2 Co 3 [Fe(CN) 6 ] 2 nanoparticles can be a potential cathode candidate for the application of lithium-ion and sodium-ion batteries due to its excellent electrochemical performance, easy preparation, low cost and environment benefits.
研究领域:
材料科学
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电化学
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能源存储
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无机化学
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纳米材料
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
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2025
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IF 17.7
Lihong Tan,Xinhe Wu,Jiachao Xu,Mahmoud Sayed,Guohong Wang
The construction of crystalline/amorphous g-C 3 N 4 homojunctions presents a versatile strategy to obtain all-organic homojunction photocatalysts with better interface matching and lower interface charge carrier movement resistance for optimized photocatalytic activity. However, the process entails a complex multi-step workup, which compromises its feasibility. To overcome this challenge, this work provided an innovative Na 2 CO 3 -induced crystallinity modulation strategy to construct a Na-doped crystalline/amorphous g-C 3 N 4 S-scheme homojunction photocatalyst in a single step. The approach involves the initial pre-assembling of melamine and cyanuric acid molecules, and subsequent introduction of Na 2 CO 3 before the calcination. Na 2 CO 3 plays key roles to induce in-situ crystallinity modulation during the calcination and as a source for Na-doping. The prepared g-C 3 N 4 S-scheme homojunction photocatalyst demonstrated a prominent H 2 O 2 -production rate of 444.6 μmol·L –1 ·h –1 , which is 6.1-fold higher than that of bulk g-C 3 N 4 . The enhanced activity was attributed to the synergistic effect of charge carrier separation induced by the S-scheme homojunction system, and the optimized interfacial H 2 O 2 generation kinetics. The latter was fostered by the Na-doping. This study provides an innovative approach for the one-step construction of g-C 3 N 4 S-scheme homojunction and its integration in photocatalytic applications.
研究领域:
材料科学
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光催化
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无机化学
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能量转换
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
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2025
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IF 7.2
Qiuping Li,Shaopeng Gu,Liang Yu,Jingmeng Dong,Zerong Duan
Chromium (Cr) slag, a byproduct of steelmaking, is an important recyclable secondary resource. The preparation of Na 2 CrO 4 from Cr slag has the potential to enhance the economic value of the slags and address environmental challenges linked to Cr(VI). This study investigated the heating processes of Cr slag without and with 30 wt.% Na 2 CO 3 under different atmospheres (air and argon) from 30 ℃ to 1400 ℃. The results showed that 30 wt.% Na 2 CO 3 reacted with Cr 2 O 3 and FeCrO 4 , starting to form Na 2 CrO 4 at 915 ℃ in air. When the heating temperature exceeded 1200 °C, Na 2 CrO 4 started to volatilize, which can be collected. Conversely, heating Cr slag with Na 2 CO 3 in argon generated NaCrO 2 without Cr volatilization. This research proposed a green one-step and cost-effective method for Na 2 CrO 4 preparation: Cr slag heated with 30 wt.% Na 2 CO 3 in air to 1400 ℃. It can use the residual heat from steelmaking, contributing to the recovery and utilization of secondary resources.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Qiuping Li,Shaopeng Gu,Liang Yu,Funian Han,Jingmeng Dong
A method to separate vanadium (V) and chromium (Cr) from vanadium-chromium (V-Cr) slag was developed to treat the hazardous substances effectively. This approach was achieved by heating V-Cr slag with Na 2 CO 3 in air within a temperature range of 30 °C to 1400 °C. Through TG-DSC, XRD, SEM-EDS and XPS tests, the results showed that Na 2 CO 3 reacted with V compounds at lower temperatures, producing NaVO 2 and Na 3 VO 4 . At the high-temperature stage, Na 2 CO 3 reacted with Cr compounds, resulting in Na 2 CrO 4 and Cr 2 O 3 formation on the slag surface. As the temperature exceeded 1200 °C, volatiles (Na 2 CrO 4 , NaCrO 2 , and other Cr compounds) were generated from the residuals and collected by condensation to separate V and Cr. This method provides a novel strategy for eco-friendly resource utilization of V-Cr slag, which is highly efficient, minimizes hazardous wastes, and can be further promoted in the industry.
研究领域:
冶金学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2018
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IF 6.434
Xiaolei Ye,Shenghui Guo,Wenwen Qu,Li Yang,Tu Hu,Shengming Xu,Libo Zhang,Bingguo Liu,Zimu Zhang
The exploration of the dielectric properties of waste hydrodesulfurization catalysts has important guiding significance for the development of microwave heat treatment of waste hydrodesulfurization catalysts for the recovery of valuable metals. The resonant cavity perturbation technique was used to measure the dielectric properties of waste catalyst and the mixture of waste catalyst and Na 2 CO 3 during roasting from room temperature to 700 °C at 2450 MHz. The heating properties of the waste catalyst and mixture of waste catalyst and Na 2 CO 3 were determined in the microwave field. The results show that the waste catalyst and the mixture of waste catalyst and Na 2 CO 3 exhibit strong microwave response capability, and the dielectric constant, dielectric loss factor, and dielectric loss tangent increase with increasing temperature; from 20 to 300 °C, the waste catalyst and the mixture of waste catalyst and Na 2 CO 3 heated at a slower rate, while the material heated rapidly from 300 to 700 °C. In addition, the mechanism of microwave action has been proposed based on the study of dielectric properties and heating properties in the microwave field.
研究领域:
材料科学
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环境工程
✓ 已验证
DOI
高影响因子
FUEL
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2020
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IF 5.578
Yue Yu,Lei Shi,Jianjun Guo,Xin Li,Wenbing Yang,Zhigang Zhang,Guangwen Xu
Soluble strong bases such as NaOH or CH 3 ONa were industrially applied in production of multiple carbonates via the transesterification route. However, the catalytic efficiency decreased significantly after recycling and insoluble solids were formed, leading to a complicated and non-eco-friendly manufacture process. In this study, the influence of Na-based soluble basic catalysts (C 4 H 9 ONa, C 2 H 5 ONa, CH 3 ONa, NaOH, Na 2 CO 3 , and NaHCO 3 ) structures, amounts, reusability, reaction atmospheres, and different reactants treatment were systematically studied for in-depth understanding the deactivated processes and mechanism. The results indicated dimethyl carbonate (DMC) was responsible for the deactivation and with decreasing the pK b (alkalinity coefficient) value, the alkali strength, nucleophilicity, and catalyst efficiency increased. The properties of fresh, DMC-treated and recycled NaOH or CH 3 ONa samples were characterized by means of XRD, FT-IR, Raman, TG, and SEM. Nearly all the characterizations proved that the final deactivation species was Na 2 CO 3 after long-time treatment or recycle. A possible deactivation mechanism of soluble bases during the transesterification process was proposed. The presence of trace H 2 O was the induction of CH 3 ONa deactivation, whereas the interaction between DMC and NaOH led to the formation of Na 2 CO 3 . This finding will contribute to the development of strategies to design homogeneous catalysts with high activity and stability for carbonate transesterification.
研究领域:
化学工程
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
Research
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2018
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IF 0
Jianchao Sun,Yong Lu,Hao Yang,Mo Han,Lianyi Shao,Jun Chen
Na-CO 2 batteries have attracted significant attentions due to their high energy density and effective utilization of greenhouse gas CO 2 . However, all reported Na-CO 2 batteries employ excessive preloaded metal Na, which will lead to safety issues such as dendrite formation and short circuit. In addition, the charging mechanism of reported Na-CO 2 batteries is not very clear. Here we report the Na-CO 2 batteries, starting from the cathode of cheap Na 2 CO 3 and multiwalled carbon nanotubes (CNTs). Due to the effective electron transfer and high reactivity, the decomposition of Na 2 CO 3 and CNTs could take place under 3.8 V. The charging mechanism of 2Na 2 CO 3 + C → 4Na + 3CO 2 without any side reactions is revealed by in/ex situ techniques such as Raman, gas chromatograph, and optical microscope. Dendrite-free Na can quantitatively deposit on the Super P/Al anode because of large specific surface area and low nucleation barrier of the anode for Na plating. The batteries could deliver an energy density of 183 Wh kg −1 (based on the whole mass of the pouch-type batteries, 4 g) with stable cycling performance. This work reveals that safe rechargeable Na-CO 2 batteries could be constructed by cheap Na 2 CO 3 and multiwalled carbon nanotubes.
研究领域:
储能
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电化学
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材料科学
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可持续能源
✓ 已验证
DOI
危险品化学品经营许可证（带存储）