JOURNAL OF BIOTECHNOLOGY
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2017
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IF 2.599
Chun-Xia Jiang,Yu-Cai He,Gang-Gang Chong,Jun-Hua Di,Ya-Jie Tang,Cui-Luan Ma
Sugarcane bagasse (SCB) is an abundant, renewable and inexpensive agricultural byproduct for the production of biofuel and other biobased products. To effectively saccharify SCB with cellulases, combination with dilute alkali salts Na 2 SO 3 /Na 3 PO 4 (0.4% Na 3 PO 4 , 0.03% Na 2 SO 3 ) at 7.5% sulfidity and hot water (DASHW) in “one-pot” pretreatment media by autoclaving at 110 °C for 40 min was attempted to pretreat SCB in this study. Furthermore, FT-IR, XRD and SEM were employed to characterize the changes in the cellulose structural characteristics (porosity, morphology, and crystallinity) of the pretreated Na 2 SO 3 /Na 3 PO 4 -SCB solid residue, which indicated that combination pretreatment could effectively remove lignin and hemicellulose for enhancing enzymatic saccharification. After 72 h, the reducing sugars and glucose from the enzymatic in situ hydrolysis of 50 g/L Na 2 SO 3 /Na 3 PO 4 -SCB in dilute Na 2 SO 3 /Na 3 PO 4 (0.27% Na 3 PO 4 , 0.02% Na 2 SO 3 ) media were obtained at 33.8 and 21.8 g/L, respectively. Finally, the SCB-hydrolysates containing 20 g/L glucose were used for ethanol fermentation in the presence of dilute alkali salts. After 48 h, the ethanol yield was 0.42 g ethanol/g glucose, which represents 82.1% of the theoretical yield. In conclusion, this study provided an effective pretreatment strategy for enhancing SCB’s saccharification, which has potential application of other lignocellulosic materials.
研究领域:
生物工程
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可再生能源
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2023
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IF 2.6
Hongxia Li,Lijiang Guo,Lu Luo,Zongying Zhou
The solid–liquid phase behavior of the NaF–Na3PO4–H2O ternary system and its binary subsystems NaF–H2O and Na3PO4–H2O at 308.15, 323.15, and 348.15 K has been measured by the isothermal dissolution equilibrium (IDE) method. Compared with the measured solid–liquid phase behavior data, the previously reported results have been evaluated and the unreasonability has been discussed. The phase diagrams at the investigated temperatures for this ternary system are drawn according to the measured solid–liquid phase behavior and the corresponding wet solid and liquid-wet solid–solid lines. From the phase diagrams, it is found that at a given temperature, there are three types of equilibrium solid phases, NaF(s), double salt 2Na3PO4·NaF·19H2O(s), and Na3PO4·12H2O(s) in the ternary system. Accordingly, there are two cosaturated points for NaF(s) and double salt 2Na3PO4·NaF·19H2O(s), double salt 2Na3PO4·NaF·19H2O(s) and Na3PO4·12H2O(s), respectively. The comparison of phase diagrams at different temperatures suggests that, with the rise of temperature, the double salt crystal region became a little bit larger, and correspondingly, the crystal regions of pure salt (NaF(s) and Na3PO4·12H2O(s)) became smaller, which is not beneficial to the separation of fluoride and phosphate. This indicates that the fluoride and phosphate separation process should be at lower temperatures.
研究领域:
化学
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材料科学
✓ 已验证
DOI
高影响因子
FUEL
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2024
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IF 6.7
Faraz Ahmad,Yueli Wen,Muhammad Zeeshan,Bin Wang,Awais Ashraf,Bai Hui,Zheng Cui,Chengda Li,Samia Kausar,Wei Huang
The balance of acid-base property is crucial for the catalytic performance of Side-Chain Alkylation of Toluene with Methanol (SATM). In this work, Na 3 PO 4 modified NaX catalysts with suitable middle base strength and feasible acid-base center distance were prepared by direct solvent-evaporation and exhibited the best styrene selectivity of 45.4 % and the total yield of side chain alkylation products of 71.7 %, respectively at methanol conversion up to 99.9 % in NaX-P (0.075) . Notably, the selectivity exhibits surprising stability in the evaluated 15 days, which might owe to the uniform dispersion of active species and constant acid base property. Combined the comprehensive characterizations of solid-state NMR, FTIR, SEM, and XPS, etc., with Density Functional Theory (DFT) calculation results, it is revealed that O-1264 are affected mostly by loading Na + or both of Na + and PO 4 3- , which exhibits the least adsorption energy and the highest electronic cloud density in the four kinds of oxygen atoms according to the calculated Bader charge. Therefore, the structure S4 (O-1264) was considered to be the most stable and meet the basicity requirements for SATM.
研究领域:
催化化学
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材料科学
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理论化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
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2025
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IF 5.6
Mengmeng Yan,Zi-Ao Jin,Pengji Wang,Yaru Guo,Ya-Xia Yin,Sailong Xu
Transition metal layered oxides have emerged as promising cathodes for sodium-ion batteries (SIBs), yet suffer from sluggish kinetics and serious capacity attenuation due to surface side reactions, microcracks and surface residual alkalies. One effective improvement strategy typically by single surface coating is used to boost electrochemical performances. Here, a dual-surface-coated O3-NaNi 0.4 Fe 0.2 Mn 0.4 O 2 (NFM) cathode is prepared using the in-situ formed Na 3 PO 4 /P3-NFM during the thermal decomposition reaction of NH 4 H 2 PO 4 . The Na 3 PO 4 coating layer, formed by NH 4 H 2 PO 4 and the residual sodium species on the surface of O3-NFM, serves as a protective layer; while the P3-NFM, with layered structure anchored firmly on the O3-NFM surface, facilitates fast Na + diffusion kinetics. The Na 3 PO 4 /P3-NFM coatings rebuild the interface as a stable and fast path for Na + transport, enhance the interface stability, and restrain the adverse factors for interfacial side reactions, intragranular cracks and irreversible phase transformations. Consequently, the optimized cathode exhibits satisfactory rate capabilities (130.6 mAh g −1 at 1C and 90.0 mAh g −1 at 10C), and a favorable cyclability (75.6 % after 300 cycles at 1C), as well as an excellent air stability. These results promise a highly effective improvement strategy for boosting electrochemical performances of promising layered oxide cathodes for SIBs.
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2023
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IF 7.4
Jiayong Ni,Jiaqi Si,Tian Lan,Weidong Sun,Guofeng Zhao,Ye Liu,Yong Lu
The fluidized-bed reactor is a preferred option for the design of an intrinsic-safety oxidative coupling of methane (OCM) process, because it permits such strongly exothermic reaction to proceed isothermally. However, the widely studied Mn-Na 2 WO 4 /SiO 2 catalyst cannot meet the requirements of the fluidized-bed reaction. Ground-breaking fluid catalyst coupling high activity/selectivity with good anti-agglomeration and high attrition resistance represents a grand challenge. Herein, we report an Mn 2 O 3 -Na 3 PO 4 /TiO 2 catalyst (280–355 μm) for the fluidized-bed OCM process, achieving 28.5% CH 4 conversion with 70.1% C 2 -C 3 selectivity at 760 °C for a feed gas of CH 4 /O 2 of 5/1 while remaining unchanged within 16 h test. This catalyst shows significant fluidization behavior under OCM reaction conditions. It is found that TiO 2 nanorods tangle up with each other to form an interpenetrating nano-structure thereby inducing strong mechanical strength and robustness with a low attrition index of only 2.8%. Moreover, high melting-point Na 3 PO 4 and use of TiO 2 support impart the catalyst to good anti-agglomeration because of eradication of formation of the sticky Na 2 Si 2 O 5 and molten Na 2 WO 4 (main cause for agglomeration) encountered in the Mn-Na 2 WO 4 /SiO 2 .
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
DESALINATION
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2014
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IF 3.96
Xiuzhen Wei,Songxue Wang,Yingying Shi,Hai Xiang,Jinyuan Chen,Baoku Zhu
A positively charged composite nanofiltration (NF) hollow fiber membrane was prepared by interfacial polymerization with polyethyleneimine (PEI) and trimesoyl chloride (TMC) as the reactive monomers . The preparation conditions were optimized, and a relatively simple preparation process was developed. In the optimized preparation process, Na 3 PO 4 is not needed and the heat-treatment process can be omitted, which saves operation time and reduces cost. The surface morphology and chemical structure of the resulting composite NF membrane were characterized by scanning electron microscopy (SEM), attenuated total reflectance-Fourier transform infrared (ATR-FTIR), and X-ray photoelectron spectroscopy (XPS). Pure water flux , contact angle, molecular weight cut-off (MWCO) and surface zeta potential of the composite NF membrane were also evaluated. The rejection of the NF membrane for MgCl 2 (1 g/L aqueous solution at 0.4 MPa) was above 97.0%, and the permeate flux was approximately 35.3 L/m 2 h. Furthermore, the NF membrane also showed excellent rejection performance for different dye molecules. The rejections of the NF membrane to brilliant blue KN-R, cationic red X-GTL, acid red B, rhodamine B and cationic gold yellow X-GL were 99.9%, 99.8%, 98.8%, 97.5% and 96.7%, respectively.
研究领域:
膜科学
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纳米技术
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材料科学
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水处理
✓ 已验证
产品关联
DOI
高影响因子
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