CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2022
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IF 3.898
Xiaodong Yang,Na Yang,Ziqiang Gong,Feifei Peng,Bin Jiang,Yongli Sun,Luhong Zhang
In this paper, the superhydrophobic polyurethane sponge (SS-PU) was facilely fabricated by etching with Jones reagent to bind the nanoparticles of Ni-Co double layered oxides (LDOs) on the surface, and following modification with n -dodecyl mercaptan (DDT). This method provides a new strategy to fabricate superhydrophobic PU sponge with a water contact angle of 157° for absorbing oil with low cost and in large scale. It exhibits the strong absorption capacity and highly selective characteristic for various kinds of oils which can be recycled by simple squeezing. Besides, the as-prepared sponge can deal with the floating and underwater oils, indicating its application value in handling oil spills and domestic oily wastewater. The good self-cleaning ability shows the potential to clear the pollutants due to the ultra-low adhesion to water. Especially, the most important point is that the superhydrophobic sponge can continuously and effectively separate the oil/water mixture against the condition of turbulent disturbance by using our designed device system, which exhibit its good superhydrophobicity, strong stability. Furthermore, the SS-PU still maintained stable absorption performance after 150 cycle tests without losing capacity obviously, showing excellent durability in long-term operation and significant potential as an efficient absorbent in large-scale dispose of oily water.
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高影响因子
CRYSTENGCOMM
·
2022
·Vol. 24
·期 18
·3369-3379
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IF 3.756
Yang Xu,Xiaodong Hao,Xishuo Zhang,Tong Wang,Zhuangzhuang Hu,Yujiao Chen,Xinyi Feng,Wen Liu,Fangyuan Hao,Xingang Kong,Chaozheng He,Shufang Ma,Bingshe Xu
Oxygen vacancy (VO) engineering has proved to be an effective approach for improving the hydrogen evolution reaction (HER) performance of low-cost metal oxide electrocatalysts. Cerium dioxide (CeO2), an abundant rare-earth metal oxide, is famous for its easy formation of VO and high oxygen mobility, which is believed to be conducive to its application in electrocatalytic HER. Herein, this study reports a facile modification strategy using rGO as a conductive support for CeO2 nanocrystals and introducing the transition metal Ni as the active dopant, resulting in the construction of the Ni–rGO/CeO2 electrocatalyst. It is found that rGO decoration prevents the aggregation of CeO2 NCs and increases the VO concentration in the CeO2 nanocrystals as well, while the introduced Ni leads to further formation of VO and serves as the active site for the HER reaction. Thus, the Ni–rGO/CeO2 electrocatalyst shows relatively low overpotential, a low Tafel slope, and great stability for HER, which is attributed to the synergistic effect of rGO decoration and Ni doping. This kind of facile strategy is promising for the design of noble-metal-free and low-cost electrocatalysts by the functional modification of CeO2-based nanocatalysts.
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高影响因子
Green Energy & Environment
·
2022
·
IF 12.781
Ran Xi,Yiwei Tang,Richard Lee Smith,Xiaoning Liu,Le Liu,Xinhua Qi
Ni–Ru bimetallic porous carbon sphere (Ni–Ru@PCS) catalysts were synthesized via formaldehyde-assisted, metal-coordinated crosslinking sol–gel chemistry, in which biomass-derived tannic acid and F127 surfactant were used as carbon precursor and soft template, respectively, and Ni 2+ and Ru 3+ were used as cross-linkers. In the developed method, Ni–Ru particles became uniformly dispersed in the carbon skeleton due to strong coordination bonds between metal ions (Ni 2+ and Ru 3+ ) and tannic acid molecules and bimetal interactions. The as-synthesized Ni–Ru 10:1 @PCS catalyst with a loading Ni:Ru mole ratio of 10:1 was applied for the selective hydrogenation of glucose to sorbitol, and provided 99% glucose conversion with a sorbitol selectivity of 100% at 140 °C in 150 min reaction time and exhibited good stability and recyclability in which sorbitol yield remained at 98% after 4 cycles with little or no metal agglomeration. The catalyst was applied to glucose solutions as high as 20 wt% with 97% sorbitol yields being obtained at 140 °C in 20 h. The developed bimetallic porous carbon sphere catalysts take advantage of sustainably-derived materials in their structure and are applicable to related biomass conversion reactions.
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高影响因子
FUEL
·
2022
·
IF 8.035
Yunzhu Wang,Songshan Zhu,Jichang Lu,Jiangping Liu,Yi Zhao,Sufang He,Yuhui Zhao,Huihui Lu,Yongming Luo
In this manuscript, the relationship between metal-support interaction and the catalytic performance for hydrogen production from steam reforming of glycerol (GSR) over Ni-Al 2 O 3 based catalysts was studied. Pure core–shell structured Ni@Al 2 O 3 and supported Ni/Al 2 O 3 with a fixed medium-sized nickel particle were synthesized without the other additional components to eliminate the influence of other factors. And then the nickel-alumina interaction of Ni@Al 2 O 3 was tuned precisely and the regulatory mechanism of nickel-alumina interaction on catalytic activity was elaborated. The strong nickel-alumina interaction over Ni/Al 2 O 3 and Ni@Al 2 O 3 with high calcination temperature resulted in the formation of NiAl 2 O 4 , which was unfavorable to the reduction of nickel species to obtain the more active nickel. Consequently, the poor catalytic performance was caused. The moderate nickel-alumina interaction of Ni@Al 2 O 3 promoted the exposure of the maximum area of active nickel and obtained higher turnover frequency (TOF). Thus, Ni@Al 2 O 3 showed the high catalytic performance in GSR. Additionally, metal-support interaction affected the morphology and growth mechanism of coke deposition. For Ni@Al 2 O 3 with moderate nickel-alumina interaction, the formation of carbon deposition followed the ‘tip-growth’ pattern, and the filamentous coke was mainly formed on catalysts. Conversely, ‘base-growth’ pattern was followed on Ni/Al 2 O 3 with strong nickel-alumina interaction to form mainly encapsulated coke. The research findings of the regulatory role of interaction between nickel and alumina on catalytic performance will provide valuable guidelines for designing effective GSR catalysts.
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高影响因子
RENEWABLE ENERGY
·
2022
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IF 8.634
Feng Lin,Yulong Ma,Yonggang Sun,Zhi Song,Xiuqin Men,Yuhua Wu,Yingbo Zhu,Tingting Gao,Yudan Zhong
The catalytic upgrading of renewable lignin to value-added transportation fuels and chemicals is considered as the best solution to environmental and energy-related issues, however, such conversions are challenging. In this study, a new type of two-dimensional (2D) nanosheet catalyst, Ni/HZ5-NS (50 nm), was synthesized and used to catalyze the selective hydrodeoxygenation of a lignin model compound, 4-ethylguaiacol, to prepare renewable fuel precursors (C 8 –C 16 alkanes). The Ni/HZ5-NS catalyzed conversion of 4-ethylguaiacol to ethyl-cycloalkane reached 100%, and the product selectivity was greater than 95%. The microenvironment of the Ni species in Ni/HZ5-NS was regulated by HZ5-NS. The catalytic activity of Ni/HZ5-NS was twice than that of the traditional Ni/HZ5 catalyst. The high catalytic activity of Ni/HZ5-NS can be attributed to the synergy between the electron-rich Ni and the acidic sites on HZ5-NS but more importantly to the 2D nanosheet structure, which reduces the mass transfer resistance of the system and facilitates molecular diffusion. The application of Ni/HZ5-NS to catalyze C–O bond cleavage was extended to other lignin-derived aromatic ring compounds, and the conversion was found to reach 100%. Importantly cycloalkanes could be obtained with high selectivity. Therefore, this study will be useful for extracting alternative sources of valuable fuel precursors from biomass.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Shichao Zhang,Wenbin Chen,Junju Mu,Jianyu Han,Chaofeng Zhang,Zhuyan Gao,Jian Zhang,Yehong Wang,Feng Wang
Rapid kinetic adsorption and long-term cyclic stability are two of the major obstacles to the industrialization of solid amine adsorbents. The morphology and dispersibility of the organic amine in the pore structure of the support can strongly affect the adsorption rate and stability of CO 2 . In this work, we propose a strategy that enhances the dispersion and stability of tetraethylene pentamine (TEPA) via anchoring TEPA with single site Ni(II) in the pore of the commercial mesoporous silica gel (SG). The microscopic morphology and dynamic behavior of TEPA molecules in the adsorbents preparation process were explored by molecular dynamics simulation, which proved that the dispersibility of anchored TEPA in the porous structure has been improved, resulting in enhanced mass transfer and increased kinetic adsorption rate. The anchored Ni-TEPA/SG adsorbents exhibit a 37.5% faster kinetic adsorption rate than TEPA/SG adsorbents at 30 wt% TEPA loading, and the time required to reach 90% of maximum adsorption capacity is shortened by 6 times. Besides, the CO 2 adsorption performance of the optimized Ni-TEPA/SG adsorbent remains unchanged after 20 cycles, consolidating the potential of our proposed strategy in improving the kinetic adsorption rate and cyclic stability of solid amine adsorbents as well as promoting its industrialization.
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高影响因子
FUEL
·
2022
·
IF 8.035
Zidan Zou,Chun Chen,Zhi Hu,Yue Shen,Zhen Fu,Wenchao Li,Yunxia Zhang,Haimin Zhang,Huijun Zhao,Guozhong Wang
Silica is one of the most referenced materials for the preparation of heterogeneous metal catalysts. However, silica spheres with smooth surfaces have difficulty encapsulating active metals due to their small surface area and the presence of only a handful of silicon hydroxyl groups on the surface. In this work, the silica sphere has been first consciously transformed into a hierarchical SiO 2 @silicate structure, and then the core–shell hetero-structured SiO 2 @Ni/SiO 2 catalyst can be tactfully obtained by reducing treatment. The core–shell catalyst is composed of a rigid core (SiO 2 ) and a rough shell (Ni NPs highly disperse on nanosheet SiO 2 ), which are carefully verified by X-ray diffraction (XRD), transmission electron microscope (TEM), field scanning electron microscope (FESEM), H 2 -TPR/TPD and X-ray photoelectron spectroscopy (XPS). The derived SiO 2 @Ni/SiO 2 catalyst can selectively hydrogenate vanillin in the aqueous phase at near-room temperature (40 ℃) and low hydrogen pressure (2 MPa H 2 ), and the conversion of vanillin can be up to 99%. The preparation method of the SiO 2 @Ni/SiO 2 catalyst is simple and can be amplified to a large scale at a low price, thus can be adopted to convert bio-derived unsaturated compounds in an economical and eco-friendly way.
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高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2022
·
IF 4.889
He Han,Anfeng Zhang,Limin Ren,Xiaowa Nie,Min Liu,Yi Liu,Chuan Shi,Hong Yang,Chunshan Song,Xinwen Guo
Shape-selective alkylation of toluene with methanol is one of the most attractive promising synthetic routes to para -xylene. To date, modified ZSM-5 zeolites are considered to be one of the best candidate catalysts for this reaction. Although the para -selectivity could be tuned to approaching 100% by modification of the zeolite and optimization of reaction conditions, at present, there is still a lack of effective means to inhibit the rapid deactivation of the catalysts due to coke formation. In this work, a coke-resistant (Pt + Ni)/ZSM-5 zeolite with excellent stability for shape-selective alkylation of toluene with methanol to para -xylene is developed. The pore structure and acid properties of the zeolite are effectively tuned to ensure high para -selectivity. Meanwhile, the co-existence of Pt and Ni species in this catalyst plays the critical role in inhibiting coke formation, as the two species concurrently impede the formation of olefins, the main coking precursors, via two distinctive mechanisms.
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高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2023
·
IF 6.1
Qin Zhang,Lijiao Fan,Wenbin Liu,Yuming Xie,Jiangang Li,Guolin Huang
The core–shell structure UiO-66-NH 2 @Ni-MOF was prepared by in-diffusion growth of 2D Ni-MOF on UiO-66-NH 2 using PVP (polyvinylpyrrolidone) as a structural guide. It was applied to the adsorption of U(VI) in aqueous solution. The materials were characterized by powder X-ray diffraction (PXRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy dispersive spectrometer (EDS). The UiO-66-NH 2 @Ni-MOF adsorption to U(VI) was investigated experimentally. The study showed that the adsorption of U(VI) onto UiO-66-NH 2 @Ni-MOF was endothermic and spontaneous. At pH 5.00 and 308 K, the adsorption capacity was 581.40 mg/g according to Langmuir model. In addition, the adsorption process can be described by the pseudo-second-order kinetic model. The adsorption capacity was kept at 83.83% of its original one after five sorption–desorption cycles, a promising indication for repetitive usage.
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高影响因子
MOLECULES
·
2023
·Vol. 28
·期 15
·5683
·
IF 4.6
Yan Xiao,Nannan Zhan,Jie Li,Yuan Tan,Yunjie Ding
The catalytic upgrading of ethanol into butanol through the Guerbet coupling reaction has received increasing attention recently due to the sufficient supply of bioethanol and the versatile applications of butanol. In this work, four different supported Cu catalysts, i.e., Cu/Al2O3, Cu/NiO, Cu/Ni3AlOx, and Cu/Ni1AlOx(Ni2+/Al3+molar ratios of 3 and 1), were applied to investigate the catalytic performances for ethanol conversion. From the results, Ni-containing catalysts exhibit better reactivity; Al-containing catalysts exhibit better stability; but in terms of ethanol conversion, butanol selectivity, and catalyst stability, a corporative effect between Ni–Al catalytic systems can be clearly observed. Combined characterizations such as XRD, TEM, XPS, H2-TPR, and CO2/NH3-TPD were applied to analyze the properties of different catalysts. Based on the results, Cu species provide the active sites for ethanol dehydrogenation/hydrogenation, and the support derived from Ni–Al–LDH supplies appropriate acid–base sites for the aldol condensation, contributing to the high butanol selectivity. In addition, catalysts with strong reducibility (i.e., Cu/NiO) may be easily deconstructed during catalysis, leading to fast deactivation of the catalysts in the Guerbet coupling process.Keywords:copper catalyst;hydrotalcite;stability;ethanol;butanol
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PubMed
高影响因子
Nano Today
·
2023
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IF 17.4
Haoran Cheng,Yamin Pan,Wei Li,Chuntai Liu,Changyu Shen,Xianhu Liu,Caofen Pan
The appropriate multi-component strategies and ingenious microstructure design remain challenging for the development of multifunctional and high-performance electromagnetic wave absorbing materials. Here, magnetic Ni nanoparticles-anchored reduced graphene oxide (RGO)/Ti 3 C 2 T x MXene hybrids were successfully assembled on melamine foam (MF) via electrostatic self-assembly and hydrazine vapor reduction processes, achieving high-performance electromagnetic wave absorption and multifunctionality . Interestingly, the RGO/MXene/Ni-MF achieves high-performance microwave absorption with a minimum reflection loss value of − 61.3 dB and a maximum width effective absorption bandwidth (EAB) of 7.04 GHz. The superior electromagnetic wave absorption stems from a 3D dielectric/magnetic network with satisfactory impedance matching, dielectric/magnetic losses, interface/dipole polarization and multiple reflection scattering. Furthermore, the RGO/MXene/Ni-MF also revealed outstanding hydrophobicity , thermal insulation , infrared shielding and incombustibility. This work opens up novel prospects for developing lightweight, multifunctional microwave absorbers for practical applications.
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高影响因子
MOLECULES
·
2023
·Vol. 28
·期 12
·4604
·
IF 4.6
Li Zhang,Mengting Zhang,Pingping Yang,Yin Zhang,Junjie Fei,Yixi Xie
Rutin, as a biological flavonoid glycoside, has very important medicinal value. The accurate and rapid detection of rutin is of great significance. Herein, an ultrasensitive electrochemical rutin sensor based on β-cyclodextrin metal–organic framework/reduced graphene oxide (β-CD-Ni-MOF-74/rGO) was constructed. The obtained β-CD-Ni-MOF-74 was characterized by X-ray diffraction spectroscopy (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), and nitrogen adsorption and desorption. The β-CD-Ni-MOF-74/rGO presented good electrochemical properties benefiting from the large specific surface area and good adsorption enrichment effect of β-CD-Ni-MOF-74 and the good conductivity of rGO. Under optimal conditions for the detection of rutin, the β-CD-Ni-MOF-74/rGO/GCE showed a wider linear range (0.06–1.0 μM) and lower detection limit (LOD, 0.68 nM, (S/N = 3)). Furthermore, the sensor shows good accuracy and stability for the detection of rutin in actual samples.Keywords:electroanalysis;carbon materials;electrochemical reduction;modified electrode
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PubMed
高影响因子
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