Sustainable Energy & Fuels
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2020
·Vol. 4
·期 9
·4694-4703
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IF 5.503
Zhewen Ma,Qiuyu Zhang,Subrata Panda,Wen Zhu,Fengzhan Sun,Darvaish Khan,Jinjian Dong,Wenjiang Ding,Jianxin Zou
Nano-confinement (NC) of Mg/MgH2 in suitable host materials is a promising strategy for simultaneously tuning the thermodynamics and kinetics of Mg-based hydride materials. In the present study, the fabrication of multifunctional host materials for NC of MgH2 was firstly attempted with the aim of improving the hydrogen sorption properties of MgH2. The NC of MgH2 in the mesoporous structure of a Ni-based metal–organic-framework (denoted as MgH2@Ni-MOF) was successfully conducted via a combination of solvothermal method and wet impregnation method followed by hydrogenation at relatively lower temperatures. Structural inspections through X-ray diffraction and high resolution transmission electron microscopy demonstrate the in situ formation of Mg2NiH4 around the MgH2 nanocrystals (∼3 nm), due to the reaction between Ni ions from the Ni-MOF and Mg ions from the dibutyl-magnesium (MgBu2) precursor in a hydrogen atmosphere. Hydrogen sorption tests reveal that the thermodynamics (−65.7 ± 2.1 and 69.7 ± 2.7 kJ mol−1 H2 for ab-/desorption, respectively) and kinetics (41.5 ± 3.7 and 144.7 ± 7.8 kJ mol−1 H2 for ab-/desorption, respectively) of Mg/MgH2 in the MgH2@Ni-MOF composite have been significantly improved. Meanwhile, the Ni-MOF scaffold acts as an “aggregation blocker” to impede the growth and agglomeration of Mg/MgH2 nanocrystals during hydriding/dehydriding cycles, leading to outstanding hydrogen cycling stability. The improvement in thermodynamics and kinetics of MgH2@Ni-MOF has been attributed to the synergistic “nanosize effect” of nanoconfined Mg/MgH2 and catalytic effects from in situ formed Mg2Ni/Mg2NiH4.
研究领域:
材料科学
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化学
·
能源存储
✓ 已验证
DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 5
·2472-2482
·
IF 3.119
Jie Meng,Fan Fang,Nengjie Feng,Hui Wan,Guofeng Guan
To improve the catalytic activity when utilizing metal oxides for the combustion of VOCs, Mn/Al-SBA-15 catalysts have been successfully synthesized through an emerging wetness impregnation technique involving Mn(NO3)2 on Al-SBA-15, which has been directly prepared from attapulgite by a hydrothermal method. Compared to Mn/SBA-15, which is prepared with TEOS as its silicon source, all the as-prepared Mn/Al-SBA-15 catalysts demonstrated enhanced catalytic performance in the oxidation of toluene. From this research, the 8% Mn/Al-SBA-15 catalyst presented the best catalytic performance, due to the high efficiency resulting from the high chemical valence of Mn4+. When the concentration of toluene was 2000 ppm, and the space velocity was 60 000 mL (g h)−1, 8% Mn/Al-SBA-15 could effectively reduce the T50 and T90 values of toluene to 201 and 278 °C, respectively; while the 8% Mn/SBA-15 catalyst could reduce the T50 and T90 values of toluene to 223 and 298 °C, respectively. A systematic investigation has been conducted to reveal the synergistic effects of Al doping and manganese loading on the enhanced catalytic performance. The experiments showed impressive results, demonstrating that Al doping can not only increase the surface acidity of SBA-15, but it can also be beneficial for achieving a uniform dispersion of MnOx on the surface and in the pores of Al-SBA-15, resulting in the enhancement of the catalytic performance.
研究领域:
环境科学
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催化
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化学工程
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2022
·
IF 6.449
Xiao-Man Wang,Ya-Nan Zeng,Li-Qun Jiang,Yi-Tong Wang,Jun-Guo Li,Le-Le Kang,Rui Ji,Di Gao,Fu-Ping Wang,Qing Yu,Ya-Jun Wang,Ai-Min Ji,Zhen Fang
Highly stable catalysts were prepared by wet impregnation of blast furnace dust (BFD) in Na 2 CO 3 ·H 2 O, Na 2 CO 3 ·10H 2 O, NaHCO 3 and Na 2 CrO 4 solution and subsequent calcination at 300–600 °C. At low temperature of 65 °C for 2 h with methanol/oil molar ratio of 15/1, high biodiesel yield of 100 wt% was obtained with for both Na 2 CO 3 ·H 2 O@BFD 300 and Na 2 CO 3 ·H 2 O@BFD 400 catalyst (impregnating with Na 2 CO 3 ·H 2 O solution and calcining at 300 and 400 °C) at 7 wt% for the first use. Na 2 CO 3 ·H 2 O@BFD 300 catalyst exhibited outstanding stability and recyclability with biodiesel yield of 100 wt% at the fifth use (93 wt% at the twelfth use) owing to the formation of stable and active nanocomponents of NaFeO 2 (32.42 nm) and magnetic nanocomponent of Fe 3 O 4 (size of 3.14 nm and magnetization of 6.16 Am 2 /kg). This study finds a solution to use solid waste for the green production of biodiesel.
研究领域:
催化
·
可再生能源
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2019
·
IF 4.507
Junmei Liang,Zhenyi Zhang,Kejing Wu,Yanchun Shi,Weihua Pu,Mingde Yang,Yulong Wu
In this study, a novel carbon nanotube (CNT)-supported CuCo catalyst was successfully synthesized by wet impregnation. Experimental and theoretical results on catalytic deoxygenation of stearic acid , a model compound of microalgal bio-oil, revealed that the CuCo catalyst can effectively inhibit cracking reactions and promote production of diesel-like hydrocarbons. CuCo particles in the pores of CNTs were conducive to conversion of stearic acid to long-chain alkanes, featuring a high selectivity of 94.82% at 100% conversion. CuCo catalyst in oxidation state underwent fast in-situ reduction at the beginning of deoxygenation reaction, and its catalytic performance was comparable to that of reduced CuCo catalyst. The improved catalytic conversion of stearic acid to diesel-like hydrocarbons can be achieved at a high ratio of Cu 0 /(Cu + +Cu 0 ) and lattice Co atoms. In addition, the reduced H 2 pressure and amounts of catalysts show potential for large-scale industrial applications.
研究领域:
化学工程
·
催化
·
可再生能源
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Xilong Wang,Qinghua Zhang,Hechun Jiang,Yadong Li,Hongwei Zhu,Lirong Zheng,Lin Gu,Han-Pu Liang
Pt-based intermetallic alloys with high activity and stability are promising for accelerating the cathodic oxygen reduction reaction (ORR) and large-scale application of proton exchange membrane fuel cells. So far, facile synthesis of Pt-based alloys in less time is desirable but still challenging. Herein, based on the traditional wet impregnation method, facile in situ reduction of H2PtCl6 and alloying with a hybrid nanostructure mainly doped with Fe single atoms as well as small amounts of Fe-based nanoparticles and oxides were developed to fabricate highly dispersed PtFe nanoparticles loaded on a mesoporous Fe–N–C support. Alloying of Pt derived from H2PtCl6 with various iron-based species existing in forms of single-atom, metallic, and oxide states was confirmed by systematic characterization, and the Fe content in the support is important for PtFe alloy formation, and the corresponding electrochemical performance promotion has been identified. The as-synthesized best-performance PtFe/Meso-PDA-5 catalyst delivered a high potential of 0.925 V at a current density of 3 mA cm–2 and achieved a high mass activity of 497.5 mA mgPt–1 at 0.9 V for the ORR in 0.1 M HClO4. More importantly, only 17.9% mass activity loss was observed after 10k potential cycles of the accelerated deterioration test. The present work provides a strategy for facile synthesis of Pt-based alloy nanomaterials for ORR catalysis and highlights the importance of supports in alloy formation.
研究领域:
材料科学
·
电化学
·
催化
·
能源材料
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Zhijie Jiang,Xutang Liu,Wei Zhao,Fei Wang,Mingyu Cui,Linyang Dong,Chong Liang,Dingkai Wang,Shuiyuan Fu
Photocatalysis, a sustainable development strategy, employed to produce value-added chemicals from lignin, has attracted much attention due to its low energy consumption and mild reaction conditions. Carbon quantum dots (CQDs) and tungsten oxide (WO 3 ) composite photocatalysts (CQDs/WO 3 ) were prepared by ultrasonic assisted wet impregnation method in this study. The CQDs/WO 3 nanosheets exhibit good optical properties and satisfactory performance of lignin depolymerization. Characterization results embody that the addition of CQDs significantly changes the morphology of WO 3 . Compared with bulk pure WO 3 , CQDs/WO 3 becomes a nanosheet structure in the size of ∼ 200 nm. Furthermore, CQDs can absorb photogenerated electrons as well as reduce the recombination of photogenerated electrons and holes. The strong oxidizing ability of n -type semiconductor WO 3 enables it to effectively break the typical bonds like C-O or C-C near polar functional groups in lignin. Due to this ingenious design, dealkaline lignin conversion was up to 34.21% as well as the highest yields of vanillin and vanillic acid in the form of lignin were 24.74 mg/g and 8.02 mg/g in 2 h at room temperature, visible light illumination and air atmosphere, respectively. And optimized CQDs/WO 3 also had satisfactory effects on three natural lignin (grass lignin, pine lignin and birch lignin), which proved its universality. Electron spin resonance experiments and mechanism investigation demonstrated that ·O 2 - and ·OH play a weighty role in photocatalytic depolymerization of lignin. This study provides a new gambit for converting lignin to high value-added chemicals (vanillin and vanillic acid) over modified WO 3 .
研究领域:
化学工程
·
材料科学
·
环境科学
·
光化学
✓ 已验证
产品关联
DOI
高影响因子
BIOMASS & BIOENERGY
·
2022
·
IF 5.774
Wenlu Zhang,Chunrong Wang,Beining Luo,Peihang He,Lei Zhang,Guoqiang Wu
With the aim of developing efficient heterogeneous catalysts for production of clean biodiesel through the transesterification process, a novel Mo catalyst supported on the outer surface of ZSM-22 ( x Mo/ZSM-22) was developed and synthesized successfully with the wet impregnation method. The characterization results showed that the Mo(VI) oxide species were highly dispersed on the surface of catalysts under the Mo-loading not higher than 5%, and the aggregation of the MoO 3 nanoparticles were detected above the Mo-loading of 5%. Meanwhile, the maximum acid intensity was also exhibited in the 5Mo/ZSM-22 catalyst. As a result, the catalytic performance of Mo/ZSM-22 catalysts in the transesterification of waste cooking soybean oil (WCSO) was significantly improved compared with the untreated ZSM-22 catalyst. Especially, the 5Mo/ZSM-22 showed the good activity (X WCSO of 59.29%, S Biodiesel of 99.86%), which was mainly due to the well dispersed Mo species and the larger acidity. Additionally, the 5Mo/ZSM-22 catalyst exhibits good stability and the high biodiesel selectivity , and the fuel properties of the as-synthesized biodiesel meet ASTM D6751 standards. This work provides a useful synthesis strategy of transesterification catalysts for the preparation of biodiesel.
研究领域:
化学工程
·
催化
·
可再生能源
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2019
·
IF 3.173
Xin Chen,Jiabin Zhou,Tianlei Zhang,Lidan Ding
The Co/BiVO 4 composites were prepared by wet impregnation method and used to combine photocatalysis and sulfate radical-based oxidation processes for degradation of tetracycline hydrochloride. The effect factors including the mass percentage of cobalt and peroxymonosulfate (PMS) concentration were investigated in detail. The tetracycline hydrochloride solution with an initial concentration of 40 mg/L could be completely degraded within only 25 min in Co/BiVO 4 +Vis + PMS system. By cyclic degradation experiment, as-prepared Co/BiVO 4 composites had good reusability and stability. Free radicals quenching experiment indicated that SO 4 − and OH played an important role for degradation of tetracycline hydrochloride. We confirmed the redox cycle of Co 2+ /Co 3+ during the PMS activation process by X-ray photoelectron spectroscopy. Based on the above results, a possible enhanced reaction mechanism was proposed.
研究领域:
环境科学
·
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
H.I. Hamouda,H.M. Abdel-Ghafar,M.H.H. Mahmoud
Great attention has been paid to antimicrobial agents' development to face and control infection transmission of infectious diseases spreading. Decorated multi-walled carbon nanotubes (MWCNTs) with silver nanoparticles (Ag NPs) are useful substances with antibacterial potency that might be used for a wide range of medical applications and water disinfection to limit the spreading of infectious diseases. In this work, silver nanoparticles were loaded on the surface of MWCNTs via the wet-impregnation technique followed by thermal treatment at 450 °C for 4 h in an inert atmosphere . Different ratios of Ag NPs (0, 3, 6, 12 and 24) were loaded on the surface of MWCNTs. The synthesized Ag-MWCNTs nanocomposites were characterized by XRD, XPS, and TEM . The antibacterial efficacy of Ag-MWCNTs nanocomposites was tested towards different microbial strains (bacteria and fungus); P. aeruginosa , E. coli , B. subtilis , S. aureus , C. albicans , and A. niger, which proved the wide spectrum of Ag-MWCNTs. The synthesized nanocomposite showed a higher antimicrobial capability against gram-positive than gram-negative bacteria. Biological studies indicated a large inhibition zone for each bacterial strain that reaches 18.5 mm. SEM and fluorescent microscopy were tested to examine the structural disruption in the outer membranes after incubation with the antibacterial agent. The nanocomposite firmly agglutinated to the surface of the bacterial cells, leading to cells' wrapping, morphology deterioration, and cell death. The inhibition ability of Ag-MWCNTs nanocomposite with a broad spectrum of microorganisms provides exciting opportunities to enhance and maximize potable water disinfection and medical applications to control infectious diseases spreading.
研究领域:
纳米技术
·
材料科学
·
微生物学
·
生物医学工程
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）