TETRAHEDRON
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2017
·
IF 2.651
Cuiling Wang,Jiaxu Yan,Mo Du,Joseph A. Burlison,Chi Li,Yanni Sun,Danqing Zhao,Jianli Liu
One step synthesis of the natural product indirubin by reductive coupling of isatin with KBH 4 is described and a possible mechanism for the reaction is proposed. Eleven indirubin derivatives were obtained easily from the corresponding substituted isatin.
研究领域:
有机化学
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药物化学
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产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2020
·Vol. 31
·期 13
·134003
·
IF 3.551
Yuantao Pei,Liqiong Wang,Liang Huang,Yuetong Hu,Quanli Jia,Haijun Zhang,Shaowei Zhang
ISOBAM-104-stabilized Ni2+ colloidal catalysts were synthesized through a facile method and used for hydrogen generation from hydrolysis of potassium borohydride (KBH4). Ni nanoparticles (NPs) were formed as the active phase during the catalytic process. Ultraviolet–visible spectrophotometry (UV–vis) and transmission electron microscopy were employed to characterize the structure and particle size of the as-formed Ni NPs. The results suggested that the catalytic activity of Ni2+ colloidal catalyst increased with the decreased size of as-formed Ni NPs, which is consistent with the results of density functional theory calculation. The highest catalytic activity of the catalyst can be 12400 ml-H2 min−1 g-Ni−1, which was even higher than that of noble Pt or Pd colloidal catalysts prepared using identical methods and catalytic conditions. According to the Arrhenius method, the ISOBAM-104-stabilized Ni2+ colloidal catalysts showed low activation energies of about 41.3 kJ mol−1 for the hydrogen generation from hydrolysis basic KBH4 solution.
研究领域:
化学
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材料科学
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能源科学
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DOI
高影响因子
NANOTECHNOLOGY
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2017
·Vol. 29
·期 4
·044002
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IF 3.44
Liang Huang,Chengpeng Jiao,Liqiong Wang,Zili Huang,Feng Liang,Simin Liu,Yuhua Wang,Haijun Zhang,Shaowei Zhang
ISOBAM-104 protected Rh/Ag bimetallic nanoparticles (NPs) with average diameter less than 3.0 nm were synthesized by a co-reduction method. Ultraviolet–visible spectroscopy, transmission electron microscopy (TEM), high-resolution TEM and x-ray photoelectron spectroscopy (XPS) were employed to characterize the structure, particle size, and electronic structure of the prepared bimetallic NPs. The catalytic activities of prepared bimetallic NPs for hydrogen generation from hydrolysis of a basic KBH4 solution were evaluated in detail. The results indicated that as-prepared Rh/Ag bimetallic NPs showed a higher catalytic activity than corresponding monometallic NPs. Among all the monometallic NPs and bimetallic NPs, Rh80Ag20 bimetallic NPs exhibited the highest catalytic activity with a value of 6010 mol-H2·h−1·mol-catalyst−1 at pH = 12 and 303 K. The high catalytic activities of Rh/Ag bimetallic NPs could be attributed to presence of negatively charged Rh atoms and positively charged Ag atoms, which is supported by the results of XPS and density functional theory calculation. Based on the kinetic study, the apparent activation energy for the hydrolysis reaction of the basic KBH4 solution catalyzed by Rh80Ag20 bimetallic NPs was about 47.0 ± 3.9 kJ mol−1.
研究领域:
材料科学
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催化化学
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纳米技术
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Zhiyu Wei,Lu Fan,Aji Egu,Haiyu Fan,Yuhan Liang
CNTs-Cu x O prepared by impregnation was used with KBH 4 to reduce NO 3 – -N as the first step. CNTs-Cu x O was characterized by SEM, EDS-mapping, TEM, XRD and XPS . The NO 3 – -N reduction batch experiment showed that 100% of NO 3 – -N removal efficiency was achieved in < 10 min with the initial pH of 3.0, 5.0 and 7.0, NO 3 – -N concentration of 30 mg(N)/L, CNTs- Cu x O dosage of 3 g/L and KBH 4 concentration of 3 mmol/L. At the initial pH of 9.0, NO 3 – -N was completely removed in 15 min. The main product of the first step reaction was NO 2 – -N, which was accumulated in the solution and rapidly reduced to N 2 by NH 2 SO 3 H as the second step. The reusability of CNTs-Cu x O was evaluated and the experiment result showed that 96% of NO 3 – -N removal efficiency was achieved in 10 min after CNTs-Cu x O was reused for 5 cycles of reaction. Moreover, the Cu 2+ dissolution was kept monitored for the reaction system, and the analysis result showed that there was no Cu 2+ leaching for all cycles of reutilization.
研究领域:
环境科学
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材料科学
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化学工程
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DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2018
·
IF 1.686
Huaiwei Zhang,Jianbo Qi,Zhenguo Ji
Synergic effects of rare earth-magnesium based hydrides (LaH 3 -MgH 2 ) on thermal dehydrogenation of potassium borohydride (KBH 4 ) are discussed in the paper. Comparing to above 675 K for the LaH 3 -MgH 2 or KBH 4 , the dehydrogenation temperature can be decreased to 346 K for the composites (LaH 3 -MgH 2 -KBH 4 ). The apparent activation energy of desorption process for the mixture is also greatly reduced. On the other hand, the products in the temperature programmed desorption process are also illustrated.
研究领域:
材料化学
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无机化学
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能源材料
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储氢材料
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固态化学
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DOI
高影响因子
RSC Advances
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2017
·Vol. 7
·期 10
·5725-5732
·
IF 3.108
Baozhong Zhu,Fan Li,Yunlan Sun,Qichang Wang,Yuxin Wu,Zicheng Zhu
To develop the combustion characteristics of aluminum powder in steam, the ignition and combustion process of aluminum powder with different additives (KBH4, ammonium perchlorate (AP) and NaCl) addition at different levels were studied using a transparent pipe furnace. The temperature variation of these samples was measured using a thermocouple, and a high-speed camera was used to record combustion phenomenon. The solid combustion products of these samples with good characteristics were collected to analyze the microstructure and component. The results indicate that the ignition temperature of aluminum powder is decreased by adding these additives or increasing the content of the additive, whereas the maximum combustion temperature is different. When adding 3 wt% KBH4, the maximum combustion temperature reaches up to 1404 °C, which is higher than that of the original aluminum powder. However, upon addition of AP or NaCl the maximum combustion temperature decreases. Simultaneously, the combustion flame of aluminum powder with addition of KBH4 or AP is comparatively intense and bright, whereas the addition of NaCl reduces combustion intensity. The different influence mechanisms of additives on the ignition and combustion of aluminum powder are believed to be responsible for the experimental results.
研究领域:
材料科学
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燃烧学
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化学工程
✓ 已验证
DOI
高影响因子
Journal of CO2 Utilization
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2021
·
IF 7.132
Tianhao Wang,Yi Zhao,Huiru Zhang,Weitian Hui
Carbon dioxide (CO 2 ) emissions from the combustion of fossil fuels cause the intensification of greenhouse effect. Consequently, a new non-noble nanoalloy of Ni 0 , Cu 0 and Fe 0 was prepared for the production of formate (HCO 2 − ) from CO 2 in flue gas by hydride transfer reaction under atmospheric pressure and mild temperature in this work. Under the optimal reaction conditions obtained by experimental optimization, which were that catalyst dosage was 1 g·L -1 , KBH 4 concentration was 0.15 mol·L -1 , reaction temperature was 55 °C, solution pH was 9.5 and flow velocity of flue gas was 0.5 L min -1 , the CO 2 conversion efficiency (CCE) was achieved as 55.97 %. Due to the employment of nanoalloy of Ni 0 , Cu 0 and Fe 0 , the CCE was improved by about 25 % compared with that in non-catalytic conditions, and meanwhile, the KBH 4 dosage was reduced by around 45 %. Based on the catalyst properties before and after the reaction as well as the product detection, we put forward that the electrode potential differences among the ternary transition metals resulted in the improvement of catalyst surface activity to promote KBH 4 activation and the hydride transfer reaction for CO 2 . The work presented herein is conducive to the development of novel transition metal-based nanomaterials for CO 2 resource utilization in a low-energy way.
研究领域:
环境科学
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材料科学
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化学工程
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产品关联
DOI
高影响因子
Catalysts
·
2017
·Vol. 7
·期 4
·125
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IF 3.082
Liqiong Wang,Liang Huang,Chengpeng Jiao,Zili Huang,Feng Liang,Simin Liu,Yuhua Wang,Haijun Zhang
ISOBAM-104 protected Rh/Ni bimetallic nanoparticles (BNPs) of 3.1 nm in diameter were synthesized by a co-reduction method with a rapid injection of KBH4solution. The catalytic activities of as-prepared BNPs for hydrogen generation from hydrolysis of a basic KBH4solution were evaluated. Ultraviolet-visible spectrophotometry (UV-Vis), transmission electron microscopy (TEM), and high-resolution transmission electron microscopy (HRTEM) were employed to characterize the structure, particle size, and chemical composition of the resultant BNPs. Catalytic activities for hydrolysis of KBH4and catalytic kinetics of prepared BNPs were also investigated. It was shown that Rh/Ni BNPs displayed much higher catalytic activities than that of Rh or Ni monometallic nanoparticles (MNPs), and the prepared Rh10Ni90BNPs possessed the highest catalytic activities, with a value of 11,580 mol-H2·h−1·mol-Rh−1. The high catalytic activities of Rh/Ni BNPs could be attributed to the electron transfer effect between Rh and Ni atoms, which was confirmed by a density functional theory (DFT) calculation. The apparent activation energy for hydrogen generation of the prepared Rh10Ni90BNPs was about 47.2 ± 2.1 kJ/mol, according to a kinetic study.Keywords:Rh/Ni BNPs;hydrogen generation;catalytic activities;electron transfer effect
研究领域:
材料科学
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催化化学
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产品关联
DOI
高影响因子
ChemistrySelect
·
2023
·Vol. 8
·期 48
·e202303437
·
IF 2.1
Ms. Menghan Li,Xuan Luo,Tongming Su,Xinling Xie,Hongbing Ji,Zuzeng Qin
Graphical Preparation of NiZr/N-doped TiO 2 /Ti 3 C 2 catalyst for catalytic cinnamaldehyde (CAL) hydrogenation by KBH 4 reduction. N-doped TiO 2 on Ti 3 C 2 , and N-doping substituted O in the TiO 2 lattice to create oxygen vacancies on the surface, increase the surface acidity, and adsorb C=O bonds, which resulted in high cinnamaldehyde conversion and cinnamyl alcohol (COL) selectivity after reaction 8 h. An NiZr/N-doped TiO 2 /Ti 3 C 2 catalyst was prepared by KBH 4 reduction for cinnamaldehyde hydrogenation. Characterization results showed that the synthesis of N-doped TiO 2 on Ti 3 C 2 and the uniform dispersion of TiO 2 on the Ti 3 C 2 surface increased the specific surface area of NiZr/Ti 3 C 2 by 164.4 m 2 /g. N-doping at a level of 19.03 % was used to replace O in the TiO 2 lattice; the Ti−O−Ti peak in the XPS spectrum of the undoped catalyst was shifted by 0.3 eV in the spectrum of the doped catalyst; as a result, there was a 15.40 % increase in the number of surface oxygen vacancies of the NiZr/Ti 3 C 2 catalyst. The synthesis of N-doped TiO 2 on Ti 3 C 2 converted the moderately acidic sites of NiZr/Ti 3 C 2 to strong Lewis acid sites and increased the total number of acid sites by approximately 0.8-fold. The active Lewis acid sites on the surface of NiZr/N-doped TiO 2 /Ti 3 C 2 adsorbed only C=O bonds and inhibited the adsorption of C=C bonds, resulting in a high cinnamaldehyde conversion of 90.69 % and a cinnamyl alcohol selectivity of 91.87 %.
研究领域:
催化
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化学工程
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材料科学
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产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2017
·Vol. 19
·期 21
·2860-2869
·
IF 3.474
Xiaoli Yu,Qi Diao,Xiaokai Zhang,Yong-Ill Lee,Hong-Guo Liu
Hexagonal ultrathin nanoplates of basic lead carbonates were synthesized in aqueous lead acetate solution under ambient conditions. The sizes of the nanoplates were found to reach several hundreds of nanometers to micrometers, whereas the plate thickness was only several nanometers, corresponding to 3, 4, or 5 stacking layers along the c-axis. These nanoplates exhibited effective catalytic properties for the hydrogenation of nitroarenes, such as nitrobenzene, 4-nitroaniline, and 4-nitrophenol, and other organic dyes, such as methylene blue and methyl orange in aqueous solutions in the presence of KBH4. Pb nanoclusters were generated in situ during the catalytic process and were well dispersed on the surface of the nanoplates, leading to the formation of a zero-dimensional/two-dimensional (0D/2D) heterostructure. It was also found that the heterostructure exhibited different catalytic behaviors for the hydrogenation of the compounds mentioned above due to the different molecular structures and different adsorption and desorption abilities of the reactants and products. Such a heterostructure can be also anticipated to be an effective photocatalyst due to its strong UV-light absorption, the ultrathin characteristics of the highly crystalline nanoplates and the transfer abilities of the Pb nanoparticles.
研究领域:
材料科学
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催化
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纳米技术
·
化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Xingyu Zhan,Yunxiong Zeng,Zhilong Zhang,Yingchun Xia,Jingcai Xu,Bo Hong,Xinqing Wang
Antibiotic pollution has potential toxicities to living organisms and the ecological environment and draws great concern of researchers. Photocatalytic degradation of antibiotics by g-C 3 N 4 shows an unsatisfied activity due to the low utilization efficiency of photogenerated electrons and severe charge recombination. A main reason is the neglect of the utilization of electrons at the depth of the material surface. Herein, we report local microenvironment rearranged g-C 3 N 4 (V C, N -CN 6 ) with intrinsic gradient concentration nitrogen (V N ) and carbon vacancy (V C ) via KBH 4 etching followed by water oxidation, enabling a complete photocatalytic degradation (≥99.6%) of TC within 3 min under visible light. This photoactivity has a universality, and can completely visible-light photodegrade sulfadiazine and ciprofloxacin in a short time. Such an extraordinary activity is ascribed to cooperation between gradient V N modulating utilization of internal electron and V C enhancing reactive species generation. Additionally, photodegraded pathways, intermediates, and risks of TC photocatalytic degradation were elucidated by the HPLC-MS and quantitative structure-effect relationship mathematical model. This work enriches the toolbox to engineer the local microenvironment of photocatalysts to upgrade the utilization of internal photoexcited electrons and heighten TC photocatalytic degradation efficiency.
研究领域:
环境科学
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材料科学
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化学
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光化学
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催化
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）