FUEL
·
2016
·
IF 3.611
Ting Liu,Changyong Man,Xin Guo,Chuguang Zheng
Experiments were conducted in a bench-scale fixed bed reactor with α-Fe 2 O 3 and γ-Fe 2 O 3 samples to investigate the mechanism of Hg 0 oxidation in the presence of HCl at 80–680 °C respectively. HCl is one of the main impurities in coal-derived fuel gas and its contribution to Hg 0 removal is complex and necessary to research. The experimental results showed that the Hg 0 removal mechanism with HCl could probably be divided into three stages based on the reaction temperature. At low temperature, the Eley–Rideal mechanism with HCl pre-adsorption was the most probable Hg 0 oxidation pathway. As the temperature increased more than 280 °C, Hg 0 removal efficiency differs significantly on α-Fe 2 O 3 and γ-Fe 2 O 3 , and the most suitable mechanism was Langmuir–Hinshelwood. With the increasing temperature to 680 °C, the homogeneous reaction between HCl and Hg 0 as well as Langmuir–Hinshelwood are responsible for the transformation of Hg 0 . We also discovered that the reaction time played a significant impact on the Hg 0 removal at low temperature, and caused the secondary mercury removal efficiency owing to the probable product of FeCl 3 . Additionally, HBr was adopted to compare with HCl, which obviously enhanced the Hg 0 oxidation on α-Fe 2 O 3 .
研究领域:
环境科学
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化学工程
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DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 59
·54377-54381
·
IF 3.289
Dingyi Wang,Shengmei Guo,Rongxing Zhang,Sen Lin,Zhaohua Yan
An efficient procedure for the formation of C–S bonds via C–H functionalization was developed for the synthesis of aryl sulfides in good to excellent yields using TBAI–HBr system promoted direct sulfenylation of various compounds, such as phenols, pyrazolones, indoles and related heteroarenes. Low cost and widely available arylsulfonyl chlorides were used as the sulfur source to provide various sulfur-containing compounds. The characteristic of the present protocol is convenient, green, highly efficient with a wide-application and short reaction time.
研究领域:
有机化学
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合成化学
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DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2023
·
IF 4.1
Fengling Wang,Sen Jin,Yaqiong Du,Qixun Xia,Libo Wang,Aiguo Zhou
Mo 2 C T x is a novel co-catalyst to enhance the photocatalytic performance of CdS for H 2 production. The surface of Mo 2 C T x is usually terminated by fluorine anion because it is generally made by the etching of fluoride-containing solution. Here we report, a novel method to prepare highly pure MXene with Br termination by the etching of pure HBr at 220 °C for 3 d, or the HBr solution mixed with LiBr, NaBr, KBr or NH 4 Br at 180 °C for 24 h. The pure HBr etching needs higher temperature and longer time to make pure Mo 2 C T x , however, which result lager interlayer space and more active sites. All the Mo 2 C T x samples show high co-catalytic performance to enhance the photocatalytic performance of CdS for H 2 production. The H 2 production rate of CdS combined with HBr etched sample was 17,566 μmol g −1 h −1 , similar with the sampled combined with traditionally HF etched sample. This is the first report to prepare MXene by etching of Br containing solution. The Mo 2 C T x made by this method is terminated by Br/O without F, and show excellent co-catalytic properties.
研究领域:
材料科学
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化学
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催化
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纳米技术
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2023
·
IF 6.2
Jianghua Xu,Jianping Xu,Shaobo Shi,Weihao Bian,Jing Chen,Songyao Gao,Xue Zhou,Lina Kong,Xiaosong Zhang,Lan Li
Non-toxic, stable Cs 3 Bi 2 Br 9 halide perovskite films prepared using a one-step solution method have become the active layer of resistive switching memory. Here, we control the nucleation and growth of Cs 3 Bi 2 Br 9 perovskite by introducing an appropriate amount of HBr to adjust the supersaturation of the perovskite precursor solution, thus improving the film formation quality and optimizing the device performance. The memory prepared for this film has a significant bipolar resistive behavior with a high switching ratio of 10 5 , a cycle time of 300 and a retention time of 10 4 s. In addition, the current transient response of the device under pulsed voltage is investigated. By different the pulse voltage parameters (pulse amplitude, duration and time interval) to study the variation of the device current value, the term "TJUT" is finally encoded and decoded using different the number of pulses and repetitions.
研究领域:
材料科学
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电子工程
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·
IF 10.7
Hao Dong,Xin Liu,Hu Wang,Zhilong Chen,Fenghua Li,Pengxiang Wang,Jie Fu,Yuchuan Shao
Achieving a lower detection limit is always crucial for X-ray detectors in medical imaging. Two-dimensional (2D) perovskites are superior candidate materials for X-ray detection due to their high bulk resistivity, excellent environmental stability, and negligible ion migration under high bias. However, the reported detection limit of 2D perovskite X-ray detectors still apparently lags behind that of their 3D analogues due to the difficulty in the growth of high-quality bulk 2D perovskite single crystals (SCs). Herein, we demonstrate an X-ray detector with an ultra-low detection limit based on high-quality bulk PEA2PbBr4 SCs grown in HBr solution for the first time. According to the solubility difference of reactants, a slowly varying nucleation curve for the precursor solution is designed to stabilize growth rate and reduce defect density during crystal growth. The fabricated Au/PEA2PbBr4/Au detector shows a low noise level of 10−5 nA Hz−1/2 and an ultra-low dark current drift of 6.6 × 10−7 pA cm−1 V−1 s−1. Together with a commendable hole lifetime of 2.76 μs and hole mobility-lifetime product of 5.8 × 10−4 cm2 V−1, the produced detector exhibits a high sensitivity of 2998 μC Gyair s−1 cm−2 and a record-low detection limit of 0.79 nGyair s−1. The current work would be beneficial for the development of next generation medical imaging.
研究领域:
材料科学
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医学成像
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产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2018
·
IF 3.141
Pei Xie,Kai Wang,Jisong Zhang,Yunpeng Hu,Guangsheng Luo
To obtain a high quality bromobutyl rubber product, a higher selectivity of brominated secondary allylic structure is necessary, but it is difficult to realize in traditional reaction devices. We developed a microreaction system and used microwater droplets as an extractant to in situ remove HBr, the catalyst of the isomerization side reaction, from the organic reacting solution to prevent converting brominated secondary allyl to brominated primary allyl and degradation of the polymer chain. The microreaction system contains two micromixers, including a membrane dispersion micromixer for dispersing microwater droplets in the butyl rubber solution and a cross-junction micromixer for blending butyl rubber and Br2 solutions. A volume adjustable delayed loop after the micromixers is used to carry out the reaction. The results show that 1 wt % water in the organic phase is satisfied to remove HBr, and 97% selectivity of brominated secondary allyl is successfully obtained under optimized operating conditions.
研究领域:
化学工程
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聚合物科学
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材料科学
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产品关联
DOI
高影响因子
TETRAHEDRON LETTERS
·
2018
·
IF 2.125
Rongxing Zhang,Shengzhou Jin,Yuanxing Wan,Sen Lin,Zhaohua Yan
A novel, efficient, and green protocol to construct C–S bond has been developed via HBr/H 2 O 2 -mediated sulfenylation of styrenes and 4-hydroxycoumarins leading to unsymmetrical sulfides. Various unsymmetrical sulfides were prepared in one step with moderate to good yields using environmentally-friendly H 2 O 2 as oxidant and HBr as catalyst. Based on the preliminary experimental results, a plausible reaction mechanism was proposed for HBr/H 2 O 2 -mediated formation of C–S bond with thiosulfates .
研究领域:
有机化学
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绿色化学
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DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2018
·
IF 3.141
Pei Xie,Kai Wang,Guangsheng Luo
The preparation of bromobutyl rubber (BIIR) faces two challenges, the high viscosity of the reaction system and the accumulation of generated HBr during the reaction, which result in lower productivity, higher energy consumption, and lower selectivity for BIIR-1. In this work, we developed an efficiently intensified technology using calcium stearate as the acid scavenger and a microreactor as the reaction platform. We successfully realized both high productivity and high selectivity for synthesizing high concentrations of bromobutyl rubber. The optimized results indicate that using predispersed calcium stearate in a butyl rubber (IIR) solution (xCa of about 0.8 wt %) as the acid scavenger could guarantee sufficiently high selectivity for BIIR-1 (w of almost 95%). A T-junction microreactor with slitlike microchannels is suitable for mixing a high-viscosity IIR solution and a Br2 solution. As the concentration of IIR increases from 10 wt % to 15 wt %, the conversion of IIR could increase by 13%, and the residence time could be shortened to less than 1 min. The utility of the reactants and the reaction efficiency have both been largely improved.
研究领域:
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
ORGANIC & BIOMOLECULAR CHEMISTRY
·
2016
·Vol. 14
·期 22
·5136-5140
·
IF 3.559
Dingyi Wang,Rongxing Zhang,Wei Ning,Zhaohua Yan,Sen Lin
An unprecedented method for the synthesis of β-alkoxy sulfides via a NaI/HBr-mediated three-component oxysulfenylation reaction of alkenes with arylsulfinic acids and alcohols is reported. Furthermore, I2-promoted oxysulfenylation of alkenes using sodium arylsulfinates instead of arylsulfinic acids to synthesise various β-alkoxy sulfides is also described.
研究领域:
有机化学
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合成化学
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DOI
PubMed
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 10
·6083-6092
·
IF 4.036
Xia Chen,Yongjie Li,Qiang Fu,Hongyun Qin,Junnan Lv,Kun Yang,Qicheng Zhang,Hui Zhang,Ming Wang
The use of large amounts of deleterious solvents in the synthesis of metal–organic frameworks (MOFs) is one of the important factors limiting their application in industry. Herein, we present a detailed study of the synthesis of UiO-66, which was conducted with hydrobromic (HBr) acid as a modulator for the first time, at a high concentration of precursor solution (ZrCl4 and H2BDC, both 0.2 mol L−1). Powder crystals with atypical cuboctahedron structure were obtained which indicated that the HBr acid modulator played roles by competitive coordination and deprotonation modulation, thereby controlling the processes of nucleation and crystal growth. The properties of the obtained materials were systematically characterized and compared with those of materials synthesized with hydrofluoric (HF) acid and hydrochloric (HCl) acid modulators. Despite the high concentration of defectivity, the UiO-66 material synthesized with the HBr acid additive has the characteristics of larger specific surface area, excellent thermal stability and higher porosity in the structure. Besides that, the present protocol has the advantages of high reaction mass efficiency (RME), and feasibility of scalable synthesis, providing a facile and sustainable route to diverse Zr-based MOFs.
研究领域:
材料科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
ACS Applied Electronic Materials
·
2020
·
IF 0
Xiaopeng Han,Xin Wang,Jianyong Feng,Huiting Huang,Zhi Zhu,Tao Yu,Zhaosheng Li,Zhigang Zou
It is important to prepare preferentially oriented films to enhance charge carrier transport in the optoelectronic device applications. For the promising optoelectronic material of CsPbBr3, obtaining its thin films with preferred crystal orientation is highly desirable yet challenging. Herein, (121)-oriented CsPbBr3 perovskite films were successfully obtained by using HBr as the additive for PbBr2 precursor solution in the two-step solution method. Detailed investigations indicate that microstructure tailoring of PbBr2 films via HBr additives plays a crucial role in achieving (121)-oriented CsPbBr3 films. Theoretical calculations and experimental measurements demonstrate high carrier mobility in (121)-oriented CsPbBr3 films, which accords well with photovoltaic tests that the (121)-oriented CsPbBr3 film shows short-circuit photocurrent density as much as 1.68 times than the (101)-oriented one. In comparison with the (101)-oriented CsPbBr3 solar cell, the champion power conversion efficiency of the (121)-oriented CsPbBr3 solar cell increases from 2.56 to 6.91% owing possibly to its higher coverage and carrier mobility. This work not only develops a pathway to prepare compact (121)-oriented CsPbBr3 films but also highlights the importance of crystal orientation engineering in perovskite films for high-performance optoelectronic devices.
研究领域:
材料科学
·
光电材料
·
可再生能源
✓ 已验证
DOI
危险品化学品经营许可证（带存储）