Plasma Processes and Polymers
·
2016
·Vol. 14
·期 6
·1600076
·
IF 2.713
Danhua Mei,Bryony Ashford,Ya-Ling He,Xin Tu
In this study, plasma-catalytic reforming of simulated biogas for the production of value-added fuels and chemicals (e.g., H 2 ) has been carried out in a coaxial dielectric barrier discharge (DBD) plasma reactor. The influence of four Ni catalysts (Ni/γ-Al 2 O 3 , Ni/MgO, Ni/SiO 2 , and Ni/TiO 2 ) on the plasma-catalytic biogas reforming has been investigated in terms of the conversion of reactants, the yield and selectivity of target products, the carbon deposition on the catalysts, and the energy efficiency of the plasma-catalytic process. The use of plasma combined with these Ni catalysts enhanced the performance of the biogas reforming. A maximum CO 2 conversion of 26.2% and CH 4 conversion of 44.1% were achieved when using the Ni/γ-Al 2 O 3 catalyst at a specific energy density (SED) of 72 kJ l −1 . Compared to other Ni catalysts, placing the Ni/γ-Al 2 O 3 catalyst in the DBD produced more syngas and C 3 C 4 hydrocarbons, but less C 2 H 6 . The lowest energy cost (EC) for biogas conversion and syngas production, as well as the highest energy efficiency and fuel production efficiency (FPE), were achieved when using the Ni/γ-Al 2 O 3 catalyst in the plasma process. The Ni/γ-Al 2 O 3 catalyst also showed the lowest surface carbon deposition of 3.8%, after catalysing the plasma biogas reforming process for 150 min at a SED of 60 kJ l −1 . Compared to other Ni catalysts, the enhanced performance of the Ni/γ-Al 2 O 3 catalyst can be attributed to its higher specific surface area, higher reducibility and more, stronger basic sites on the catalyst surface.
研究领域:
能源科学
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催化化学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2020
·
IF 5.278
Manoj Pudukudy,Zahira Yaakob,Khaleeda Mhd Syahri,Qingming Jia,Shaoyun Shan
A set of Fe/ZrO 2 catalysts were successfully synthesized by a facile urea-assisted solid-state combustion method, and their catalytic test was evaluated for the thermal decomposition of undiluted-biogas into hydrogen-rich syngas and multiwalled carbon nanotubes (MWCNTs). The as-prepared catalysts were characterized by X-Ray diffraction (XRD), Scanning and Transmission electron microscopy (SEM and TEM), Nitrogen-physisorption, X-ray photoelectron spectroscopy and Temperature programmed reduction analyses. The iron was found in the form of hematite and metallic-iron in the fresh and reduced catalysts respectively. A suitable metal-support interaction due to the fine surface dispersion of iron species on ZrO 2 was observed in the catalysts. The N 2 -physisorption analysis indicated the reduced surface area of the catalysts after iron loading. However, it does not influence the catalytic efficiency since the metal amount and metal-support interaction was determined to play the main role. The Fe/ZrO 2 catalysts exhibited improved catalytic efficiency. With increasing the amount of iron and increasing the reaction temperature, the CH 4 and CO 2 conversions were increased significantly. A highest CH 4 and CO 2 conversions of 92% and 89% respectively, with an H 2 /CO ratio of ∼2.25 were obtained for the 50%Fe/ZrO 2 catalyst at 900 °C. The enhanced catalytic performance could be attributed to the fine-surface dispersion of iron-nanocrystals on ZrO 2 . Moreover, the MWCNTs were characterized by XRD, SEM, TEM and Raman analyses for their structural properties.
研究领域:
催化化学
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材料科学
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能源工程
✓ 已验证
产品关联
DOI
高影响因子
PROCESS BIOCHEMISTRY
·
2020
·
IF 2.952
Jintong Zhang,Lan Wang,Hongzhang Chen
The periodic low-frequency force can improve mixing efficiency and reduce water constraint, thus intensifying the high solids enzymatic hydrolysis . However, the availability of intensification methods for the periodic force with different frequencies needs to be studied. The periodic high-frequency vibration with rigid spheres added as another intensification method was proposed to shorten the time of water constraint and improve efficiency. Within this study, glucan and xylan conversions in periodic high-frequency vibration with rigid spheres added enzymatic hydrolysis (PVEH) increased by 8.3%-35% and 5.0%-33.5%, respectively, with solid loading increasing from 15% to 25%, compared with those in static state enzymatic hydrolysis (SEH). The physical properties variations of substrate indirectly proved the higher efficiency of PVEH. Based on the change regularity of constrained water release, PVEH was divided into three stages. The effects of micromixing and macromixing in three stages were analyzed. Additionally, the efficiency of high solids enzymatic hydrolysis can be enhanced by using proper intensification methods in different stages.
研究领域:
生物工程
·
酶学
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Ying Liu,Rentao Xu,Xiaolong Gong,Cheng Yao,Shunlong Pan
The increased discharge of organoarsenic to natural waters, brings significant risks to ecosystems and human health. It is curial to rapidly transform organoarsenic to harmless arsenate (As(V)) before conventional coagulation-sedimentation treatment. In this study, the roxarsone (ROX) was destroyed to form As(V) with almost 100 % transformation rate and reaction rate of 0.43 min −1 via the CoFe 2 O 4 /peracetic acid (PAA) system. Specifically, PAA was primarily activated to form singlet oxygen ( 1 O 2 ) and organic radicals (R-O·) by Co(II)/Co(III) redox cycle existed on the CoFe 2 O 4 surface, the presence of iron (Fe) in the CoFe 2 O 4 facilitated the transformation of Co(III) to Co(II), and then that reactive oxygen species (ROS) was employed to mineralize ROX. The presence of common anions, and natural organic matters (NOM) hardly inhibit the degradation of ROX. Furthermore, the catalytic efficiency of CoFe 2 O 4 /PAA system remained above 94 % after five cycles. These findings suggest that the CoFe 2 O 4 /PAA system is a promising technique for enhanced arsenic decontamination.
研究领域:
环境科学
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毒理学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Shikun Tong,Kele Yan,Jianbo Zhang,Zhiyuan Wang
Hydrate and wax phase transitions are typical flow risks during oil and gas development. The wax on hydrate formation was systematically studied based on dual-scale experimental platform. The sensitivity analysis on hydrate growth illustrates that the wax inhibits hydrate growth and the maximum reduction of hydrate growth rate is 79.6 % in waxy emulsions, and the wax on hydrate conversion ratio decreased the most by 27.2 %. The promoting effect of water content, subcooling, and stirring rate on hydrate growth increased by more than 10 times, 2 times, and 7 times, respectively. The droplet size first decreases and then increases as the wax concentration increases in emulsions. The mechanism of hydrate growth in waxy emulsions considers bidirectional growth and pores renewal of hydrate particles, and the mean error of the prediction model is 8.4 %. This work provides data basis and theoretical foundation for flow assurance management in oil and gas filed.
研究领域:
石油工程
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化学工程
✓ 已验证
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
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2014
·
IF 3.019
Dong-Can Lv,Yun-Quan Liu,Shui-Rong Li,Yue-Yuan Ye,Duo Wang
In this work, direct production of heavier hydrocarbons from biomass-derived xylitol by reduction with hydroiodic acid (HI) in the presence of phosphorous acid (H 3 PO 3 ) was studied. The effects of the feed ratio of raw materials, mixing intensity, and reaction time on catalytic performance were investigated by experiments. It was found that the molar ratio of xylitol/HI and H 2 O/HI had significant effects on the conversion of xylitol and yield of hydrocarbons. A maximum yield of 80.3% for hydrocarbons was achieved at a xylitol/HI/H 3 PO 3 /H 2 O molar ratio of 0.4:1:2:12, a mixing intensity of 800 rpm, and a reaction time of 12 h. High performance liquid chromatography (HPLC) and gas chromatograph/mass spectrometer (GC/MS) were used to determine the amount of xylitol and to analyze the composition of hydrocarbon products, respectively. The hydrocarbons obtained are mainly C 10 and C 15 hydrocarbons with aromatic rings , which have a high heating value of 43 kJ/g, making them suitable for diesel or/and jet fuel substitutes.
研究领域:
生物化学
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可再生能源
✓ 已验证
DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 20
·12035-12046
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IF 3.119
Jiahui Zhang,Ying Zhao,Zilu Tian,Jiufu Zhu,Zuosen Shi,Zhanchen Cui,Song Zhu
In this study, we evaluated bioinspired adhesive primers for durable adhesion between dentin and composite resins. N-3,4-Dihydroxyphenethyl methacrylamide (DMA) primer monomer (small bifunctional group molecules containing catechol and acrylic groups at opposite ends) was prepared to mimic the interaction between the catechol group and the mineral interface of marine mussels. The shear bonding strength, microleakage, degree of conversion, contact angle, and compatibility were tested. The shear bond strength was significantly improved, and microleakage was diminished after the application of the DMA primer. However, the degree of conversion was decreased. The wettability of the dentin was enhanced, and the DMA primer showed no negative influence on cell proliferation. The results of this study showed the possibility of using DMA primers in clinical practice. This may provide a new strategy for improving adhesion durability.
研究领域:
牙科学
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生物材料学
✓ 已验证
DOI
PubMed
高影响因子
Biomass Conversion and Biorefinery
·
2021
·Vol. 12
·期 8
·3503-3511
·
IF 4.987
Huang Xin,Xu Anbang,Bu Xinyuan,Huang Yong,Ran Jingyu
Levoglucosenone (LGO), derived from catalytic pyrolysis of cellulose, has shown its potential as a bio-renewable platform for the production of fine and commodity chemical. In this study, we report a biphasic system for conversion of LGO to 5-hydroxymethylfurfural (HMF) and levulinic acid (LA) with a substantial yield. The hydrolysis parameters, including single-biphasic phase, catalyst, temperature, and reaction time, were investigated on LGO conversion, respectively. The results showed that NaCl/H 2 O-MIBK biphasic system led to a profoundly increase of HMF selectivity by 37% compared to aqueous phase. An increase of acid site significantly enhanced LGO conversion and meanwhile promoted overreaction of HMF to LA and humins. Thus, HMF yield was observed firstly increased and then decreased with a maximum yield of 53.6% by using oxalic acid as a catalyst. The biphasic system effectively suppressed the humins formation and resulted in a maximum total HMF and LA yield of 86.7%.
研究领域:
化学工程
·
可再生资源利用
✓ 已验证
DOI
高影响因子
Catalysis Science & Technology
·
2022
·Vol. 12
·期 12
·3826-3835
·
IF 6.177
Zhenyu Cai,Fenglei Zhang,Sibing Yu,Zhipeng He,Xinjie Cao,Lei Zhang,Kai Huang
The efficient utilization of CO2 is currently a major concern, and the preparation of a catalyst with high CO2 conversion and product selectivity has become a matter of interest for researchers. Here, we report a series of transition metal-doped CO2 hydrogenation catalysts MFe2O4 (M = Zn, Cu, Ni, Co) with K residue prepared by using PBA as the precursor. The physicochemical properties of the catalysts were characterized by XRD, SEM, TEM, XPS, N2 adsorption and desorption, and H2-TPR, and the catalytic performance was tested. The test results showed that ZnFe2O4 had the highest CO2 conversion of 57.39% and the highest C5+ yield of 39.30% at 320 °C, 3 MPa, H2/CO2 = 3 : 1 and space velocity of 12 000 mL g−1 h−1. ZnFe2O4 showed no significant deactivation after 32 h of continuous operation, indicating its potential as an industrial catalyst.
研究领域:
化学工程
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催化材料
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2023
·
IF 3.8
Jiaming Li,Youjian Yang,Wenju Tao,Zhaowen Wang,Jiangyu Yu,Jiaxin Yang,Zhibo Liu
As China's aluminum electrolysis industry expanded its production capacity, it produced a large amount of bath materials– cryolite based molten salt, which is not utilized fast enough and piled up in aluminum factories. It is of great significance to find a proper way to process the accumulated bath materials. Through the method introduced in this paper, aluminum fluoride can be produced from cryolite-based electrolyte and fed back into the aluminum electrolysis cell as a necessary additive. This method includes four steps: Calcination of crystalline aluminum nitrate with cryolite. Cryolite and crystalline aluminum nitrate are mixed and preheated. The main chemical reaction that occurs in this step will produce sodium nitrate (NaNO 3 ), β-aluminum fluoride (β-AlF 3 ), chiolite (Na 5 Al 3 F 14 ) and the aluminum hydroxyfluoride hydrate (AHF). After calcination, the products are washed with water to separate soluble NaNO 3 from the other products. The insoluble products obtained after washing are calcined with ammonium bifluoride to convert AHF into AlF 3 . The mixture obtained after preheating is then washed with an aqueous solution of aluminum salt (such as Al(NO 3 ) 3 ) to remove Na 5 Al 3 F 14 . Aluminum fluoride of high purity is obtained in the end. Calcination step is the most important among the four steps. The effects of calcination temperature (85 – 135 ℃) and molar ratio of crystalline aluminum nitrate to cryolite (0.5 – 2) on the conversion rate of cryolite were studied. The experimental results show that the highest conversion rate of cryolite can reach 97.03%. Through SEM, EDS , ICP and other analysis methods, it was found the final products contained more than 98.8 wt% aluminum fluoride and less than 0.4 wt% sodium, and the average particle size of aluminum fluoride is approximately 15 – 20 µm.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2024
·
IF 6.5
Yuxi Meng,Shaomian Liu,Yixi Wang,Wenqing Xu,Jiajian Gao,Sansan Yu,Fabing Su,Tingyu Zhu
Selective catalytic reduction of NO using CO (CO-SCR) is a promising technology for the purification of NO in the flue gas. However, the presence of O 2 significantly inhibits the activity of the CO-SCR catalyst. Herein, we synthesize a hollow Mn-doped CeO 2 @Co 3 O 4 catalyst (Mn-CeO 2 @Co 3 O 4 ), which achieved 82% NO conversion, 100% CO conversion, and 78% N 2 selectivity under 5 vol% O 2 at 200 °C, superior to those of CeO 2 @Co 3 O 4 and Co 3 O 4 @CeO 2 catalysts. The characterization results indicate that the strong electronic interaction at the heterointerfaces between Co 3 O 4 and CeO 2 plays a crucial role in promoting selective adsorption of NO. Furthermore, the Mn doping into the Co 3 O 4 lattice of the catalyst facilitates the conversion of N 2 O intermediates, thereby enhancing the overall activity. This research provides a new strategy for the design and synthesis of CO-SCR catalysts.
研究领域:
催化
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环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Kang Lu,Zuxian Liu,Yi Shen
Monitoring glucose concentration in blood is an effective method to assess health status, and value-added glucose conversion can contribute to sustainable development. This study reports the utilization of platinum-based alloys consisting of Pt, PtRh, and PtRhNi nanoparticles supported by graphene nanosheet (GNS) as bifunctional catalysts for the electrochemical detection and conversion of glucose. Electrochemical results showed that the PtRhNi/GNS exhibited a peak current density of 0.044 mA cm −2 , which was two and four times higher than that of Pt/GNS and PtRh/GNS, respectively. The electrochemical sensor prepared by PtRhNi/GNS demonstrated a linear detection range of 0.06–0.36 mM for glucose with a minimum detection limit of 18.9 μM, and exhibits good stability, reproducibility, and immunity to interference. PtRhNi/GNS exhibited the best catalytic activity for glucose, with 86.4 % conversion of glucose at 0.666 V vs. RHE. Glyoxalate was the dominant product with a selectivity of 93 %. Moreover, the product distribution could be enhanced by optimizing the applied potential and electrolysis time. This study provides a promising method for the effective detection and utilization of glucose.
研究领域:
生物化学
·
材料科学
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医学诊断
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）