Frontiers of Chemical Science and Engineering
·
2017
·Vol. 11
·期 4
·564-574
·
IF 1.712
Song Baodong,Li Yongqiang,Cao Gang,Sun Zhenhai,Han Xu
In the transformation of methanol to gasoline (MTG), the selectivity to gasoline and the aromatic content in the produced gasoline are important factors. The catalytic activities of steam-treated and non-steam-treated nano-scale H-ZSM-5 (NHZ5) catalysts impregnated with Ag(I), Zn(II) or P(V) have been investigated in a continuous flow fixed bed reactor. The NH 3 -TPD results showed that after impregnation, the Ag/NHZ5, Zn/NHZ5 and P/NHZ5 catalysts contained comparatively more strong, medium-strong and weak acid sites, respectively. Treatment with steam decreased the number of acid sites in all the catalysts, but the pore volumes in the catalysts were larger which improved carbon deposition resistance resulting in prolonged lifetimes. After 6 h of MTG reaction, the selectivity to gasoline for the steam-treated catalysts,
\(Ag_{H_2 O} /NHZ5\) , \(Zn_{H_2 O} /NHZ5\) and \(P_{H_2 O} /NHZ5\) were 70.5, 68.4 and 68.7 wt-%, respectively, whereas their respective aromatic contents in the produced gasoline were 61.9, 55.4 and 39.0 wt-%. Thus \(P_{H_2 O} /NHZ5\) is the most promising catalyst for MTG applications which can meet the China IV gasoline standard that the amount of aromatics in gasoline should be less than 48 wt-%.
✓ 已验证
DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2011
·Vol. 13
·期 12
·6661-6672
·
IF 3.253
Zhou Qiang,Fu Ming-Lai,Yuan Bao-Ling,Cui Hao-Jie,Shi Jian-Wen
The semiconductor quantum dots (QDs) can be very efficient to tune the response of photocatalyst of TiO 2 to visible light. In this study, CdS QDs formed in situ with about 8 nm have been successfully deposited onto the surfaces of TiO 2 nanotubes (TNTs) to form TNTs/CdS QDs nanocomposites by use of a simple bifunctional organic linker, thiolactic acid. The diffuse reflectance spectroscopy (DRS) spectra of as prepared samples showed that the absorption edge of the TNTs/CdS composite is extended to visible range, with absorption edge at 530 nm. The photocatalytic activity and stability of TNTs/CdS were also evaluated for the photodegradation of rhodamine B. The results showed that when TNTs/CdS QDs was used, photocatalytic degradation of RhB under visible light irradiation reached 91.6%, higher than 45.4 and 30.5% for P25 and TNTs, respectively. This study indicated that the TNTs/CdS QDs nanocomposites were superior catalysts for photodegradation under visible light irradiation compared with TNTs and P25 samples, which may find wide application as a powerful photocatalyst in environmental field.
✓ 已验证
DOI
高影响因子
MICROCHIMICA ACTA
·
2016
·Vol. 184
·期 2
·483-489
·
IF 4.831
Wang Junjie,Wang Yu,Cui Min,Xu Shenghao,Luo Xiliang
An electrochemical sensor for H 2 O 2 was developed based on electrochemically deposited Prussian blue (PB) nanoparticles doped poly(3,4-ethylenedioxythiophene) (PEDOT). The PEDOT/PB composite was composed of PEDOT wrapped PB nanoparticles, where the conducting polymer PEDOT not only protected the PB particles to warrant high stability, but also connected them to enhance the electron transfer. Owing to the excellent conductivity of PEDOT and unique electrocatalytic activity of PB, the PEDOT/PB modified electrode exhibited good catalytic activity toward the electrochemical reduction of H 2 O 2 , and was used for the detection of H 2 O 2 in concentrations ranging from 0.5 to 839 μM, with a detection limit of 0.16 μM. Moreover, the sensor also demonstrated excellent reproducibility, selectivity and long-term stability, showing great promise for the fabrication of electrochemical sensors and H 2 O 2 related biosensors.
An electrochemical non-enzymatic sensor for hydrogen peroxide with excellent stability was developed. It is based on conducting polymer PEDOT doped with Prussian blue nanoparticles.
✓ 已验证
DOI
高影响因子
Journal of the Iranian Chemical Society
·
2015
·Vol. 12
·期 12
·2149-2159
·
IF 1.087
Wu Kai-Fei,Jiang Fen,Bai Xian-Li,Mo Shao-Yin,Qin Gui-Fang,Feng Yu
The reactions of a semirigid carboxylic ligand 5-(Pyridin-3-yl)isophthalic acid(H 2 pyip) with Mn(CH 3 COO) 2 /Zn(NO 3 ) 2 /Pb(NO 3 ) 2 afforded three new complexes: [Mn(pyip)(H 2 O) 2 ] n ( 1 ), [Zn(pyip)(H 2 O) 2 ] n ( 2 ), and [Pb(pyip)] n ( 3 ). Their structures have been determined by single-crystal X-ray diffraction analyses and further characterized by elemental analyses, IR spectra, powder X-ray diffraction (PXRD), and thermogravimetric (TG) analyses. X-ray structure analysis reveals that complexes 1-2 showed identical 3D supramolecular architecture that just connect different metal centers. They all crystallize in hexagonal space group P6(5) and exhibit the same coordination mode. One of the H 2 pyip adopts bidentate chelate coordination mode, and the other coordinate carboxylate oxygen atom adopts the single dentate-bridging mode. Complex 3 adopts different coordination modes crystallized in monoclinic space group P2(1)/c compared to 1-2, combined bidentate chelate and chelating–bridging tetradentate coordination modes. A noticeable point in this paper is that compounds 1-3 exhibit preferable catalytic properties on degradation of Rhodamine B (RhB). Moreover, the luminescent properties were investigated.
✓ 已验证
DOI
高影响因子
JOURNAL OF POROUS MATERIALS
·
2015
·Vol. 23
·期 2
·301-310
·
IF 1.108
Ye Wei,Zhao Binxia,Gao Han,Huang Jiajun,Zhang Xiaoli
Fe,Zn,Al-pillared montmorillonite (Mt) were prepared by ion exchange reaction. Effect of the Fe/Zn molar ratio in Fe,Zn,Al-pillaring solution on the structural properties of Fe,Zn,Al-Mt was examined. Characterization studies were performed by N 2 -adsorption/desorption, ICP, FTIR, DR UV–Vis spectroscopy and XRD. The interlayer space, specific surface and volume of micropores of pillared-Mt was 18.8 Å, 157 m 2 g −1 and 0.114 cm 3 g −1 respectively. Besides, the catalytic performance of Fe,Zn,Al-Mt was analyzed through wet peroxide oxidation of Orange II under mild experimental condition. The results indicated that the catalytic performance of Fe,Zn,Al-Mt was affected by the Fe/Zn molar ratio as following pattern: the obtained pillared solids with lower Fe/Zn molar ratios exhibited better catalytic performance and less iron leaching during the reaction. Moreover, the introduction of zinc into Mt shortened the induction time of reaction and improved the catalytic behaviour. Throughout this work, the chemical oxygen demand removal of OII was 77.1 % after the solution treated by Fe,Zn,Al(3/7)-Mt (defined as the Fe/Zn molar ratio of 3/7 in the pillaring solution) catalyst at temperature of 60 °C and atmospheric pressure of 1 atm.
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2013
·Vol. 17
·期 10
·2595-2602
·
IF 2.279
Wang Li,Qi Wei,Su Rongxin,He Zhimin
A novel electrochemical platform based on ZnS-doped graphene (GR-ZnS) nanocomposites was developed to achieve the direct electron transfer between hemoglobin (Hb) and the modified electrode. GR-ZnS nanocomposites were synthesized via noncovalent functionalization of pristine graphene (GR) by 1-aminopyrene and subsequent in situ synthesis of ZnS nanoparticles on the GR surface. During this process, the intrinsic electronic properties of GR could be efficiently protected. The as-prepared GR-ZnS nanocomposites were characterized and identified by means of transmission electron microscopy and energy dispersive X-ray spectrometer analysis, indicating the uniform formation of ZnS nanoparticles on the surface of GR. Fourier transform infrared spectra spectroscopic results confirmed that Hb remained its native structure in the nanocomposite material. The GR-ZnS nanocomposites could efficiently promote the direct electron transfer between Hb and electrode with the electron transfer rate constant ( k
s ) of 3.42 s −1 . The modified electrode was then used for the determination of H 2 O 2 based on the electrocatalytic activity of Hb towards H 2 O 2 , which exhibited a linear range from 10 to 250 μM with a detection limit of 1.12 μM. The proposed method to fabricate GR-based hybrid nanomaterials would have a great potential for applications in various fields such as electrochemical sensing, catalytic reaction, and super capacitors.
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2019
·Vol. 48
·期 11
·7068-7075
·
IF 1.676
Li Shuhui,Zhou Ying,Cui Lijun,Ge Zhenhua,Feng Jing
In 2 O 3 (ZnO) k superlattice ceramics are promising oxide thermoelectric materials, as superlattice interfaces are effective in scattering phonons and filtering low-energy electrons to decrease thermal conductivity and improve the figure of merit ( ZT ) value. In this work, homologous compounds were prepared by solid-state reaction method using ZnO and In 2 O 3 as raw materials. Phase purity and crystal structure were characterized by x-ray diffraction, revealing that In 2 O 3 (ZnO) k crystallizes in an R3 m space group for odd k values and P6 3 /mmc for even k values. The study of thermoelectric (TE) properties showed that as k increased, the thickness of InO(ZnO)
+ 3
also increased, while the electrical conductivity, thermal conductivity, Seebeck coefficient, power factor and ZT value were all decreased. In 2 O 3 (ZnO) 3 samples obtained a maximum power factor of 651 μ W m −1 K −2 at 973 K, and also achieved a maximum ZT value of 0.24 at 973 K.
✓ 已验证
DOI
高影响因子
Journal of Superconductivity and Novel Magnetism
·
2024
·Vol. 37
·期 4
·667-675
·
IF 1.6
Wu Diandian,Liu Xiansong,Han Yuyan,Feng Shuangjiu,Lv Qingrong
A sample of Y 2.85 Ca 0.15 Sn 0.08 Ti 0.05 Mn 0.07 Fe 4.8 O 12 doped with four different ions was prepared using the solid method and a subsequent procedure. X-ray diffraction (XRD), energy-dispersive X-ray (EDX), and scanning electron microscope (SEM) were used to analyze the sample’s structural features, elemental distribution, and surface morphology. The study used the B-H magnetic characteristic analyzer and superconducting quantum interferometer magnetic performance measurement system to analyze the magnetic properties of Y 2.85 Ca 0.15 Sn 0.08 Ti 0.05 Mn 0.07 Fe 4.8 O 12 . The correlation becomes more surprising as the frequency increases, indicating a decrease in permeability when the magnetic field H reaches 200 A/m. Ion substitution leads to changes in magnetic crystal anisotropy, affecting permeability as the external magnetic field strength increases. We analyze the correlation between saturation magnetization and temperature in the 520–540 K range and explain the variation of saturation magnetization with temperature. The study shows that saturation magnetization decreases as temperature increases. This result suggests that saturation magnetization decreases as temperature increases. The increased super-exchange effect due to Ti and Mn occupying the (d) sites is much stronger than the reduced effect caused by Sn occupying the (a) sites. Therefore, the saturation magnetization of the Y 2.85 Ca 0.15 Sn 0.08 Ti 0.05 Mn 0.07 Fe 4.8 O 12 sample is higher than that of the undoped sample. The Curie temperature (Tc) of the Y 2.85 Ca 0.15 Sn 0.08 Ti 0.05 Mn 0.07 Fe 4.8 O 12 sample is lower than that of the undoped sample.
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2016
·Vol. 20
·期 8
·2331-2335
·
IF 2.327
Han Jin,Niu Yubin,Zhang Yan,Jiang Jian,Bao Shu-juan,Xu Maowen
Novel O3-type Na 0.8 Ni 0.6 Sb 0.4 O 2 is successfully fabricated via a solid-state method and further firstly used as cathode material for sodium-ion batteries (SIBs). The as-obtained material delivers a high capacity of ~107.3 mAh g −1 in the voltage range of 2–4.5 V with two discharge plateaus at 3.24 and 3.62 V, and exhibits a good capacity retention (98.5 mAh g −1 at the rate of 0.2 C after 100 cycles).
✓ 已验证
DOI
高影响因子
JOURNAL OF POROUS MATERIALS
·
2020
·Vol. 28
·期 1
·109-116
·
IF 2.183
Du Yue,Zhou Lina,Liu Zhenhui,Yang Lun
Highly ordered three-dimensional (3DOM) macroporous polyoxometalate (POM)-based zirconia hybrids with relatively high surface area and interconnected pore structure have been fabricated by colloidal crystal template method. Owing to the evenly distributed POM active sites, large-scaled 3D ordered macroporous structure, and high porosity of as-synthesized POM-based ZrO 2 composite, it exhibits excellent extractive-oxidative desulfurization activity and recyclability. 500 ppm of dibenzothiophene (DBT) in the model fuel can be removed within 2 h under mild conditions and no obvious loss of catalytic activity even after 20 times. The oxidative reaction of DBT follows pseudo-first-order kinetics, corresponded to an Arrhenius activation energy of 61.1 kJ/mol.
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2018
·Vol. 47
·期 9
·5509-5517
·
IF 1.566
Wang Wenzhao,Chen Xiaoxiao,Zeng Xiangbin,Wu Shaoxiong,Zeng Yang,Hu Yishuo,Xu Sue,Zhou Guangtong,Cui Hongxing
Recently, great efforts have been devoted to study of molybdenum disulfide (MoS 2 ), particularly monolayer MoS 2 semiconductor thin films, due to its excellent electrical and optical properties. Direct growth of continuous monolayer MoS 2 films by ambient-pressure chemical vapor deposition is reported herein. Optical microscopy, Raman spectroscopy, photoluminescence spectra (PL), atomic force microscopy, x-ray photoelectron spectroscopy (XPS), and high-resolution transmission electronic microscopy were used to characterize the electronic and structural properties of the films, demonstrating that the MoS 2 films grown on silicon dioxide/silicon (SiO 2 /Si) substrate with spatial size on micron scale were high quality, single crystal, continuous, and monolayer. Raman and PL mapping were performed to confirm the uniformity of the monolayer MoS 2 films. The morphological variation of the MoS 2 films after different reaction times was observed by optical microscopy and scanning electron microscopy, revealing the growth process and thus helping to understand that the growth mechanism during synthesis of continuous large-area films depends on the distribution of the reactive intermediate molybdenum oxide (MoO 3− x ) due to its lower saturation vapor density. Back-gated transistors based on MoS 2 films were fabricated, exhibiting current on/off ratio of ∼ 10 4 and subthreshold swing (SS) of 0.44 V dec −1 . This work contributes to synthesis of large-area continuous films, thus paving the way for future scaled-up fabrication of MoS 2 electronic devices.
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2018
·Vol. 22
·期 12
·3947-3954
·
IF 2.509
Du Hai Yan,Liu Xiao Xiao,Ren Zhe,Liu Pan Pan
Poly(3,4-ethylenedioxythiophene) (PEDOT) has been electrochemically deposited on carbon paper (CP), stainless steel mesh (SSM), stainless steel (SS), and indium tin oxide (ITO) by unipolar-pulsed method. The surface morphology, micro-structure, and electrochemical capacitance for PEDOT/substrates were characterized by scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR), and electrochemical techniques. The electrochemical capacity measurements of the PEDOT/CP electrode in 0.5 M H 2 SO 4 shows high mass-specific capacitance of 126.24 F/g at a 1 mA/cm 2 , which is consistent with the specific capacitance of 126.75 F/g at 5 mV/s. Compared with PEDOT/SSM, PEDOT/SS, and PEDOT/ITO, PEDOT/CP electrode shows better capacitive performance, which presents good rate performance of 76.78% at 5 mA/cm 2 and charge-discharge stability with the capacitance retention rate of 80.57% for 5000 cycles. SEM result shows PEDOT maintained the spindle-like structure along with the threads of each carbon fiber, which are densely packed and randomly oriented forming the porous structure.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）