FUEL
·
2024
·
IF 6.7
Zhige Zhang,Guican Bi,Shenglong Zhang,Tao Tan,Jun Xie
The use of biogas as renewable raw material to produce syngas（H 2 /CO ≈ 2）suitable for direct synthesis of methanol has attracted wide attention, but designing promising catalysts with high activity and stability remains a challenge. The catalytic systems used for this process usually have the characteristics of poor stability and easy carbon deposition. Here, Based on the Ce redox cycle and the strong metal-support interaction (SMSI), we designed and synthesized a series of Ni catalysts (denoted as Ni/CeMgO x /BN) with BN interfacial constraints. The abundant oxygen vacancy of reaction-induced Ce redox cycle endows Ni/CeMgO x /BN with excellent carbon resistance, because the ability to activate CO 2 /H 2 O is significantly enhanced. The CO 2 /H 2 O activation and carbon elimination mechanism were comprehensively characterized by in situ H 2 -TPR/CO 2 /H 2 O-TPSR, in situ CH 4 -TPSR/CO 2 /H 2 O-TPO, and FTIR, etc. Ascribed to the appropriate basicity of CeMgO x , homogeneous Ni dispersion, and strong interaction between Ni ultra-small nano particles (NPs) and CeMgO x /BN, Ni/CeMgO x /BN exhibit higher CO 2 /H 2 O adsorption/activation, higher CH 4 activation/dissociation, compared with another samples, which facilitate the formation of active oxygen species and intermediate coke removal, thus enhance the resistance to coke deposition and sintering. At 750 °C, Ni/CeMgO x /BN exhibit satisfying catalytic activity (CH 4 /CO 2 conversation 92 %/52 %) and superior stability (100 h) with negligible deactivation rates.
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高影响因子
CELLULOSE
·
2019
·Vol. 26
·期 4
·2729-2741
·
IF 3.917
Zheng Chenmin,Wen Sili,Teng Ziling,Ye Chunlu,Chen Qiaoling,Zhuang Yuanhong,Zhang Guoguang,Cai Jie,Fei Peng
Abstract In this study, H 2 Ti 2 O 5 ·H 2 O nanotubes (TNTs) prepared through hydrothermal synthesis and TiO 2 used as a raw material were deposited on the surface of bamboo fibre materials through a layer-by-layer (LBL) self-assembly technique to reduce flammability. Scanning electron microscopy indicated that the TNTs were successfully loaded onto the bamboo surface, and their content was dependent on the number of assembled bilayers. Cone calorimetry results showed that the flame retardant performance of the coated bamboo fibre materials improved significantly. As the number of the assembled bilayers increased, performance was further enhanced. When the number of TNTs bilayers was 9, the time to ignition of the bamboo fibre materials was extended from 29.5 s for raw bamboo fibre (RBF) materials to 36.8 s for LBL9. The average heat release rate, total heat release and peak specific extinction area of the fibre materials decreased from 55.67 MJ/m 2 (RBF) to 35.28 MJ/m 2 (LBL9), and their fire performance index increased from 0.123 m 2 s/kW (RBF) to 0.161 m 2 s/kW (LBL9). Differential scanning calorimetry and thermogravimetry results demonstrated that the thermal oxidation and decomposition temperatures of bamboo fibre materials increased from 241.4 °C and 217 °C (RBF) to 311.3 °C and 274 °C (LBL9), respectively. Graphical abstract
研究领域:
材料科学
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纳米技术
·
燃烧学
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高影响因子
TALANTA
·
2017
·
IF 4.162
Fei Wang,Fan Yang,Yang Tian,Jiawei Liu,Jiwei Shen,Quan Bai
A stoichiometric displacement model for retention (SDM-R) of small solutes and proteins based on hydrophilic interaction chromatography (HILIC) was presented. A linear equation that related the logarithm of the capacity factor of the solute to the logarithm of the concentration of water in the mobile phase was derived. The stoichiometric displacement parameters, Z (the number of water molecules required to displace a solute from ligands) and lg I (containing a number of constants that relate to the affinity of solute to the ligands) could be obtained from the slope and the intercept of the linear plots of lg k' vs. lg[H 2 O]. The retention behaviors and retention mechanism of 15 kinds of small solutes and 6 kinds of proteins on 5 kinds HILIC columns with different ligands were investigated with SDM-R in typical range of water concentration in mobile phase. A good linear relationship between lg k' and lg[H 2 O] demonstrated that the most rational retention mechanism of solute in HILIC was a stoichiometric displacement process between solute and solvent molecules with water as displacing agents, which was not only valid for small solutes, but also could be used to explain the retention mechanism of biopolymers in HILIC. Comparing with the partition and adsorption models in HILIC, SDM-R was superior to them.
研究领域:
分析化学
·
生物化学
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高影响因子
ACS Applied Energy Materials
·
2026
·
IF 5.5
Xiaoling Peng,Ying Luo,Jiawei Xue,Farzaneh Arabpour Roghabadi,Qiang Wang,Zheng Wang,Hong He
Visible-light-driven CO2 reduction coupled with H2O oxidation is an attractive route toward artificial photosynthesis; however, its realization is often limited by inefficient charge separation in a CO2-reduction photocatalyst, sluggish interfacial charge transfer in Z-scheme systems, and insufficient CO2 activation. Herein, we report a visible-light-driven Z-scheme system in which CoOx−Ag dual-cocatalyst-modified Bi4TaO8Cl0.9Br0.1 served as the CO2-reduction photocatalyst, surface-treated WO3 as the H2O-oxidation photocatalyst, and I−/IO3− as the redox mediator. The CoOx−Ag dual cocatalysts play distinct yet cooperative roles in the Z-scheme architecture. CoOx preferentially extracts photogenerated holes and accelerates mediator oxidation, thereby promoting charge separation in Bi4TaO8Cl0.9Br0.1 and facilitating inter-photocatalyst charge transfer, whereas Ag acts as an electron-enrichment center that enhances CO2 adsorption and activation and promotes the formation of the key *COOH intermediate for selective CO production. Owing to this synergistic regulation of charge transfer and surface reaction kinetics, the optimized Z-scheme system achieved selective CO2 reduction to CO with near 100% selectivity and synchronous O2 evolution in a near-stoichiometric ratio relative to CO under visible-light irradiation. This work offers a dual-cocatalyst design strategy for efficient visible-light-driven Z-scheme CO2 reduction coupled with H2O oxidation.
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高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Pengkai Jin,Liu Yang,Zhongyi Sheng,Xinyue Chu,Dianhui Chen
An indium and copper-doped mordenite catalyst (InCu/MOR) was prepared and tested as a potential catalyst for high temperature NH 3 selective catalytic reduction (NH 3 -SCR) of NO x in the gas turbine . The InCu/MOR catalyst exhibited excellent catalytic activity (over 83 % NO x conversion) in the presence of 5 % H 2 O and 100 ppm SO 2 above 550 °C. A series of characterization (XRD, Py-TR, XPS, NH 3 -TPD, H 2 -TPR and in-situ DRIFTS) were applied to analyze the catalyst. The obtained results showed that the addition of indium promoted the formation of isolated Cu 2+ and more Brønsted acid sites, which could improve the tolerance to sulfur dioxide and inhibit the occurrence of high temperature ammonia oxidation side reactions. Meanwhile, the ammonia on InO + /In 2 O 3 sites was activated and reacted with the nitrate/nitrite species on the catalyst surface to form nitroammonium (NH 4 NO 3 /NH 4 NO 2 ), which was a short lived intermediate for NH 3 -SCR. The superior catalytic performance of InCu/MOR could attribute to these comprehensive effects.
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高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
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2021
·
IF 3.178
Qi-Chao Yang,Dong-Fang Qiu,Yuan-Lin Dang,Zhan-Ping Qiao,Zhi-wei Xu
Two equilibrium diagrams of the ternary system (CsX + MnX 2 + H 2 O, X = Cl, Br) at 298.15 K are reported in this paper. Each system has two double salts (CsMnX 3 ·2H 2 O and Cs 2 MnX 4 ·2H 2 O X = Cl, Br) in it and the elements of all double salts in phase diagrams are confirmed by Schreinemaker method. Equilibrium phase diagrams show that the chloride double salts are congruently soluble compounds in water, however that the bromide double salts are incongruently soluble compounds in water. All the double salts are characterized by titrimetric analysis, powder X-ray diffraction, thermogravimetric and differential thermalanalysis. The enthalpies of formation of these double salts are first calculated by measuring their enthalpies of dissolution.
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Catalysis Science & Technology
·
2020
·Vol. 10
·期 24
·8437-8444
·
IF 5.721
Xiaomei Yang,Liuyong Wang,Tianliang Lu,Beibei Gao,Yunlai Su,Lipeng Zhou
Hydrothermally synthesized Sn-Beta is an excellent catalyst for the conversion of sugars to alkyl lactates. However, its catalytic performance is highly dependent on the synthesis parameters. In this work, the effects of the synthesis parameters such as the water amount of the synthesis gel and the crystallization time on the synthesis and properties and catalytic performance of Sn-Beta in the conversion of glucose to methyl lactate (MLA) were investigated. The crystallization rate was accelerated remarkably by reducing the water amount of the synthesis gel. With the aid of the Si-Beta seed, Sn-Beta was almost fully-crystallized after one day with nH2O/nSiO2 of 4.5, but seven days were needed with nH2O/nSiO2 of 7.5. However, Sn-Beta synthesized with nH2O/nSiO2 of 4.5 has more extraframework SnO2 due to the fast formation of the *BEA structure and the slow incorporation of Sn4+ into the framework sites, which resulted in the lower activity of MLA formation. More Sn4+ species were incorporated into the framework sites and thus more Lewis acid sites were generated with increasing crystallization time. At the same time, the ratio of open to closed Sn sites (RO/C) increased, which led to the decrease in the activity of MLA formation and due to that, the open Sn site with a proximal silanol is unfavorable for the conversion of glucose to MLA. During recycling study, it is surprisingly found that the yield of MLA increased gradually over the fully-crystallized Sn-Beta catalyst. Characterization results of the recovered catalyst from the eighth run indicate that the structure was preserved well, but the value of RO/C reduced due to the change of the state and microenvironment of Sn species.
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ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
·
2020
·Vol. 646
·期 20
·1688-1695
·
IF 1.24
Shuangsheng Cheng,YuanDong Wu,Dajiang Mei,Shaoguo Wen,Thomas Doert
Four alkali metal bismuth sulfates, NaBi(SO 4 ) 2 · H 2 O ( 1 ) and ABi(SO 4 ) 2 [A = K ( 2 ), Rb ( 3 ), Cs ( 4 )], were successfully synthesized by hydrothermal methods. The crystal structure of 1 features a three-dimensional tunnel framework constructed by BiO 9 tri-capped trigonal prisms and SO 4 tetrahedra interconnected via common corners and edges. Compound 2 exhibits a two-dimensional 2 ∞ [Bi(SO 4 ) 2 ] – double-layered structure, assembled by one-dimensional 1 ∞ [BiS(1)O 4 ] + chains which are linked via S(2)O 4 2– tetrahedra. The isostructural compounds 3 and 4 possess a two-dimensional layered structure, and the layers being composed by BiO 8 square antiprism and SO 4 tetrahedra. The alkali metal cations are located between the layers or in the tunnels of the structures, respectively. The differences in the crystal structures of the title compounds can mainly be attributed to the different sizes of the alkali metal cations and their different coordination environments. Thermogravimetric analysis evidence that compound 1 losses one equivalent of water at 120 °C whereas the anhydrous compounds 2 – 4 are stable up to about 450, 575, and 578 °C, respectively. The solid-state UV/Vis/NIR diffuse reflectance spectra indicate bandgaps of approximately 4.48, 4.43, 3.98, and 3.96 eV for compounds 1 – 4 , respectively.
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高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2020
·
IF 2.888
Kaiyu Zhao,Kangrui Sun,Yafei Guo,Lingzong Meng,Tianlong Deng
The isopiestic equilibria for the systems {Li 2 B 4 O 5 (OH) 4 + H 2 O}, {LiB 5 O 6 (OH) 4 + H 2 O} and {Li 2 B 4 O 5 (OH) 4 + LiB 5 O 6 (OH) 4 + H 2 O} at 288.15 K and ambient pressure were measured by the isopiestic method using a modified gravimetric isopiestic apparatus. The water activities and osmotic coefficients were determined based on the sodium chloride standard reference solution. On the basis of Pitzer model, an extended Pitzer model was developed to describe the thermodynamic properties of the aqueous systems containing different forms of lithium borates, then the Pitzer single salt parameters β (0) , β (1) , β (2) and C ϕ for the binary systems {Li 2 B 4 O 5 (OH) 4 + H 2 O} and {(LiB 5 O 6 (OH) 4 + H 2 O} and mixing ion-interaction parameters θ B 4 O 5 OH 4 , B 5 O 6 OH 4 and ψ Li , B 4 O 5 OH 4 , B 5 O 6 OH 4 for the ternary system {Li 2 B 4 O 5 (OH) 4 + LiB 5 O 6 (OH) 4 + H 2 O} were fitted with the experimental osmotic coefficients using the Fortran 97 program. Meanwhile, the water activities were calculated by the Pitzer parameters, and the good agreement between the calculated water activities and experimental results of this ternary system indicated that the Pitzer parameters obtained in this work were reliable.
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高影响因子
CHEMISTRY OF MATERIALS
·
2021
·
IF 9.811
Da Chen,Shiqiang Hao,Liubing Fan,Yangwu Guo,Jiyong Yao,Christopher Wolverton,Mercouri G. Kanatzidis,Jing Zhao,Quanlin Liu
Recent discoveries in organic−inorganic metal halides reveal superior semiconducting and polarization properties. Herein, we report three organic–inorganic metal halides, (PBA)4BiBr7·H2O, (PBA)4BiI7·H2O, and (PBA)4InBr7·H2O [(PBA)+ = C6H5(CH2)4NH3+], with band gaps of ∼3.52, ∼2.29, and ∼4.05 eV, respectively. They possess zero-dimensional structures containing the inorganic octahedra [MX6]3– (M = Bi, In, X = Br, I) and unbound X– ions and crystallize in the C2 space group. (PBA)4BiI7·H2O shows a second-harmonic-generation (SHG) response in the infrared region, approximately 1.3 times that of AgGaS2; (PBA)4BiBr7·H2O and (PBA)4InBr7·H2O show SHG responses in the ultraviolet region, approximately 0.4 and 0.6 times that of KH2PO4, respectively. The large SHG responses are attributed to the synergistic contribution of the octahedral distortion of [MX6]3– (M = Bi, In, X = Br, I) and the ordered arrangement of the benzene ring-containing organic cation PBA+. Upon ultraviolet and visible-light excitations at room temperature, (PBA)4BiBr7·H2O, (PBA)4BiI7·H2O, and (PBA)4InBr7·H2O exhibit broad red-light luminescence with large Stokes shifts of 290, 237, and 360 nm, respectively, due to self-trapped exciton emission. All of these properties demonstrate that this series of metal halides are potential multifunctional optoelectronic materials.
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高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Xiaoyan Feng,Qiong Wu,Li Li,Ping Wang,Qiang Wang,Jun Liang
Simulating natural photosynthesis to convert CO 2 and H 2 O into fuels achieving overall reaction is a promising solution for addressing environmental problems and energy crises. Constructing an S-scheme catalyst of two or more catalytic sites with rapid electron transfer and strong redox capability may be an effective strategy for coupling photocatalytic CO 2 reduction and H 2 O oxidation. Here, an oxygen vacancies-rich S-scheme semiconductor photocatalyst composed of monoclinic lead chromate oxide (Pb 2 (CrO 4 )O) coupled with Mn 3 O 4 quantum dots (QDs) (Pb 2 (CrO 4 )O@Mn 3 O 4 QDs) are synthesized and tested for photoconversion of CO 2 with H 2 O under visible light. Through the integration of Pb 2 (CrO 4 )O with Mn 3 O 4 QDs, the photocatalytic C1-evolution rate on Pb 2 (CrO 4 )O@Mn 3 O 4 QDs is radically increased by 6.0 and 8.1 times, which is much faster than that of pristine Pb 2 (CrO 4 )O and Mn 3 O 4 . The origin of the greatly raised activity is revealed by advanced characterizations, and in situ X-ray photoelectron spectroscopy (XPS) confirms the electron transport pathway in Pb 2 (CrO 4 )O@Mn 3 O 4 QDs with light illumination, unveiling the efficient spatial separation/transfer of charge carriers in oxygen vacancies-rich Pb 2 (CrO 4 )O@Mn 3 O 4 QDs S-scheme heterojunction. Consequently, powerful photoelectrons and holes accumulate in the Mn 3 O 4 conduction band and Pb 2 (CrO 4 )O valence band, respectively, exhibiting prolonged long lifetimes and facilitating their involvement in CO 2 photoreduction and H 2 O photooxidation through altering the interfacial charge dynamics.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Bingyan Han,Yajun Chen,Qingdong Liu,Yuncong Gao,Jiao Wang,Haiyan Liu,Gaohong He
Aggregation-induced emission enhancement is one of the main methods for designing copper clusters (CuNCs) with high fluorescence intensity. In this study, H 2 O can rapidly construct stable hydrogen bonds with 2-thiobarbituric acid ligands of CuNCs, leading to denser aggregation between CuNCs. This process can occur at a level of intensity visible to the naked eye and can be completed within 30 s. As a result, the fluorescence turns to yellow with emission wavelength at 573 nm from red with emission wavelength at 638 nm, and the quantum yield has been increased to 50.03 %. The noticeable “turn on” phenomenon can be utilized for detecting alcohol content in low-alcohol liquor quality control. Additionally, bright luminous make Y-CuNCs can be employed for accurate identification of human latent fingerprints (LFPs), which can accurately identify the third level structure of the LFPs.
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