JOURNAL OF CATALYSIS
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2019
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IF 7.723
Jiaxuan Fan,Lingxiang Cheng,Yanan Liu,Yufei He,Yanfei Wang,Dianqing Li,Junting Feng
Photocatalytic reduction of CO 2 with H 2 O into CH 4 is a promising way to realize solar energy utilization and CO 2 conversion, in which the key issue is how to enhance and couple CO 2 reduction as well as H 2 O oxidation. In this work, we precisely fabricated a binary functional photocatalyst by loading Au@Pd nanoparticles onto V O -rich TiO 2 through a surfactant-free deposition-reduction method, whose fine structure was confirmed by aberration-corrected HAADF-STEM, EELS, EPR and XPS. Combining photocatalytic performance with a series of in situ FTIR measurements, we clarified the role of metallic sites and semiconductor support in coupling CO 2 reduction and H 2 O oxidation. Specifically, H 2 O oxidation process was facilitated by the V O -rich TiO 2 to contribute more protons, followed by the activation of CO 2 and protons primarily by the metallic Au@Pd sites to form the surface bounded Au@Pd-CO 2 − and Au@Pd-H species. By adjusting the ratio of Au@Pd nanoparticles and V O concentration to manipulate the Au@Pd-CO 2 − /Au@Pd-H ratio, CH 4 yield of 26.32 μmol/(g·h) and selectivity of electron toward CH 4 of 96% can be observed with minimal concomitant H 2 generation. These findings could open a feasible and universal route to enhance the photocatalytic efficiency of CO 2 conversion.
研究领域:
材料科学
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环境科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
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2022
·Vol. 57
·期 28
·13632-13646
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IF 4.682
Zhu Wenhao,Wu Zhenxu,Wang Peng,Liu Tianyi,Guo Min,Ji Jiansong,He Mingfeng,Wang Haifeng,Zhang Peibiao
Within brain tissue engineering, stem cell implantation assisted by biodegradable injectable scaffolds is a crucial method. However, implanted scaffolds, especially microcarriers, may translocate due to the fluidity of the materials. Therefore, the development of an MRI contrast enhancement microcarrier, which could noninvasively trace the location of the implant in vivo, is necessary to guide the evaluation of treatment prognosis. In this study, GdPO 4 ·H 2 O nanoparticles were utilized as the dispersed phase to endow PLGA microcarriers with T1-weighted MRI contrast ability. By adjusting the dispersed phase of Gd compound nanoparticle in PLGA Matrix, a cross-comparison experiment between MRI contrast enhancement imaging and biocompatibility was conducted, and 0.8% Gd was found to be the most suitable rate for preparing nano-composites. Moreover, 0.8% Gd/PLGA microcarriers were suspension-cultured with stem cells in vitro and implanted into traumatic brain injury rats in vivo. Excellent cytocompatibility and enhancement of the T1 phase of MRI were confirmed. This work created a T1-weighted MRI contrast-enhanced microcarrier, which provides a clinical noninvasive tracing cell scaffold for brain tissue engineering.
研究领域:
生物医学工程
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干细胞研究
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医学影像
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神经科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2023
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IF 2.6
Fangyan Xiang,Chunhuan Luo,Qingquan Su
As a novel working pair to replace CaCl2/H2O and LiNO3/H2O for open absorption heat pumps, LiNO3-DEG/H2O with a mass ratio of 1:4 was further researched on the basis of the overall assessment of the vapor pressure and crystallization temperature. The crystallization temperature, vapor pressure, density, viscosity, and specific heat capacity of the working pair were measured with mass fractions from 0.70 to 0.90. The vapor pressure, density, viscosity, and specific heat capacity were measured from 293.15 to 373.15 K. Regression equations for the experimental values were obtained by a least-squares method. The results showed that the vapor pressures of LiNO3-DEG/H2O with a mass fraction of 0.80 were very close to that of LiNO3/H2O with a mass fraction of 0.50, and the vapor pressures of LiNO3-DEG/H2O with a mass fraction of 0.85 were also very close to that of CaCl2/H2O with a mass fraction of 0.45. Crystallization temperatures of LiNO3-DEG/H2O with a mass fraction from 0.70 to 0.90 were lower than 243 K. Corrosion weight loss values of carbon steel, stainless steel, and copper in an atmosphere of air for LiNO3-DEG/H2O were 1.17 × 10–4, 0.35 × 10–4, and 0.33 × 10–4 g/(cm–2·m–1), respectively, which were much smaller than those for LiNO3/H2O and CaCl2/H2O.
研究领域:
化学工程
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热力学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
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2024
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IF 5.1
Changhong Zhou,Rui Ling,Menglei Wang,Chao Yang,Wentao Qi
Syngas , a mixture of H 2 and CO with adjustable compositional ratios, can be directly produced via H 2 O/CO 2 co-electrolysis in solid oxide electrolysis cells (SOECs). In this study, We have developed a strategy to enhance the catalytic activity of titanate perovskite cathodes by constructing active metal-oxide interfaces through the in-situ growth of Ni x Cu 1-x alloy nanocatalysts (x = 0, 0.25, 0.5, 0.75 and 1) on LST matrix. The evenly distribution of Ni x Cu 1-x alloy nanoparticles (∼30 nm) on the LST substrate has been confirmed through a serious of characterization techniques, including XRD , XPS, SEM and TEM. Specifically, the LSTNi 0.75 Cu 0.25 cathode demonstrated an optimal synergistic effect , achieving high efficiency in the co-electrolysis of H 2 O/CO 2 to syngas. Under an applied voltage of 1.6 V at 800 °C, the syngas production rate reaches 5.43H 2 and 3.48 CO ml min −1 cm −2 with ∼96 % Faradaic efficiency. Furthermore, the composition of the produced syngas can be finely tuned in a broad range from 0.8 to 3.5 b y simply adjusting the inlet gas composition (H 2 O/CO 2 ratio) and the operating temperature. The LSTNi 0.75 Cu 0.25 cathode, when subjected to continuous H 2 O/CO 2 co-electrolysis for 100 h, exhibited remarkable stability, attributing to the robust and active nature of the metal-oxide interfaces.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
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2024
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IF 5.6
Shengdi Tai,Chengjian Zhang,Shuaibo Shi,Kang Yang,Shaolong Han,Jinyu Wu,Shishen Zhang,Kun Zhang
The increasing demands in fields of anti-counterfeiting, fluorescence analysis, clinical therapy and LED illumination are urgently eager for more excellent optically switchable luminescent materials with the stable and multimodal fluorescence in single-component matrix. Herein, the lanthanide-disalicylaldehyde coordination hybrid H 2 Q j4 /Tb x Eu y is proposed as an efficient luminescent matrix to connect terbium sensibilization with ESIPT (excited-state intramolecular proton transfer) effects, and three multi-emission hybrids are finally designed and synthesized by regulating Tb 3+ and Eu 3+ ratios. Surprisingly, the H 2 Q j4 /Tb 0.91 Eu 0.09 shows the excitation wavelength-dependent luminescence in solution which originates from two energy transfer ways of terbium sensibilization effect. It exhibits green and red lights under the 369 and 394 nm UV lamp, respectively. Three hybrids are further used as lab-on-a-molecule fluorescent probes to perform multianalyte detection for various solvents by selected fluorescent sensing channels. By means of PCA (principal component analysis) and HCA (hierarchical cluster analysis), all of them can successfully detect and discriminate17 common solvents, especially the H 2 O and D 2 O. Moreover, the H 2 Q j4 /Tb 0.91 Eu 0.09 also shows the wide linear responses of H 2 O content in D 2 O, discrimination of two-component solvent mixtures , hygroscopicity evaluation of D 2 O and information encryption which will advance the progress of multimodal luminescent materials and multianalyte chemosensors .
研究领域:
材料科学
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光学
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分析化学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2020
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IF 2.369
Rui-Zhi Cui,Wu Li,Ya-Ping Dong,Jun Li
The solubilities in the thermodynamic phase equilibria of the LiBr–NaBr–KBr–H2O system and its two subsystems LiBr–NaBr–H2O and LiBr–KBr–H2O at 298.15 K were investigated experimentally by the isothermal solution equilibrium method. Relevant stable-phase diagrams were plotted based on the experimental results. Using Pitzer’s solution model, nonreported mixing parameters ΨLi,Na,Br and ΨLi,K,Br were acquired and the solubilities of three systems were also predicted at 298.15 K. The results show that good agreement was obtained between calculated and experimental values.
研究领域:
物理化学
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热力学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
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IF 9.965
Minghu Zhao,Jiuhu Zhao,Ran Ding,Rongshu Zhu,Haiyan Li,Zhi Li,Jingwen Zhang,Yongji Zhu,Huiying Li
The existence of sulfur dioxide and water vapor in the flue gas generated from waste-to-energy stations could lead to catalyst deactivation , which has adverse effects on NO x removal. It is thus particularly important to study the reaction mechanism of catalyst resistance to poisoning. Herein, we report the mechanism of In-Co 3 O 4 -Ga 2 O 3 /H-Beta catalyst to SO 2 and H 2 O resistance in the selective catalytic reduction (SCR) of NO x by CH 4 . The catalyst could achieve 74.6% NO x removal efficiency in the presence of 100 ppm SO 2 and 5% H 2 O. In this catalyst, Co 3 O 4 is attributed to enhancing the reversible poisoning of SO 2 and CH 4 activation and increasing the number of Brønsted acid sites by decomposing H 2 O. However, the InO + active center was still eroded by a small amount of water vapor, leading to a reduction in NO x removal efficiency. The addition of Ga 2 O 3 primarily provided an important intermediate NO 2 for CH 4 -SCR reaction and reduced the aggregates of Co 3 O 4 to increase the exposure of indium sites, and could reduce a part of SO 2 to S 2− . This study provides a good candidate for preparing catalysts with superior resistance towards SO 2 and H 2 O for CH 4 -SCR.
研究领域:
环境科学
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催化化学
✓ 已验证
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2021
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IF 6.064
Bichun Huang,Hansun Fang,Huajun Huang,Meijuan Lu,Chenglong Yu
A one-pot synthetic method was used to prepare copper (Cu)-modified manganese (Mn)-rich MnSAPO-34 catalysts, which were then used for NO x removal from stationary-source flue gas. The addition of Cu to these Mn-rich MnSAPO-34 catalysts significantly enhanced their low temperature (LT) selective catalytic reduction (SCR) activity and H 2 O resistance. The Mn 0.4 Cu 0.05 SAPO-34 catalysts demonstrated excellent LT NH 3 -SCR activity, with NO x removal being >90% from 160 to 300 °C. In addition, Mn 0.4 Cu 0.05 SAPO-34 catalysts exhibited high H 2 O resistance. This excellent performance was ascribed to strong synergistic effects between Mn 4+ and isolated Cu 2+ species in Mn 0.4 Cu 0.05 SAPO-34 catalysts, leading to suitable redox ability. The results of in situ FT-IR analysis indicated that LT-SCR reactions mainly proceeded by an Eley–Rideal reaction pathway at 200 °C in Cu-modified manganese-rich MnSAPO-34 catalysts. Thus, Mn 0.4 Cu 0.05 SAPO-34 was considered as a promising candidate for NO x removal from flue gas of stationary sources at low temperatures.
研究领域:
环境科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2017
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IF 3.387
Tao Xu,Yun Wang,Xiaofang Zhou,Xiaoli Zheng,Qun Xu,Zhimin Chen,Yumei Ren,Bo Yan
The recombination of photo-induced charges is one of the main issues to limit the large-scale applications in photocatalysis and photoelectrocatalysis. To improve the charge separation, we fabricate a novel type II 2D ultrathin TiO 2 /WO 3 ·H 2 O heterostructures with the assistance of supercritical CO 2 (SC CO 2 ) in this work. The as-fabricated heterostructures possess high photocatalytic activity for the degradation of methyl orange(MO) and high photocurrent response under simulated solar light (AM 1.5). For the TiO 2 /WO 3 ·H 2 O heterostructures, the MO solution could be degraded by 95.5% in 150 min, and the photocurrent density reaches to 6.5 μA cm −2 , exhibiting a significant enhancement compared with pure TiO 2 and WO 3 ·H 2 O nanosheets .
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2023
·
IF 22.1
Lingxiang Huang,Yue Ma,Mufan Niu,Shenyong Ren,Qiaoxia Guo,Chunming Xu,Baojian Shen
Dry reforming reaction of greenhouse gas CH 4 and CO 2 was studied over Ni-Fe bimetallic catalyst, in which the composite support of C12A7-O 2- in MCM-41 was used. The isotope 13 CH 4 /D 2 O tracing experiment showed CO mainly comes from 13 CHx oxidation reaction and DH comes from CHx and D 2 O reaction, exhibiting lattice oxygen promotes CH X oxidation and water accelerate methane conversion. XPS and TPSR-MS studies exhibited the existence of lattice oxygen in catalysts produces a little H 2 O to facilitate a lower starting point at the reaction temperature. On-line MS investigation found that the trace water addition in the system accelerated the adsorption of CO 2 on support and promoted methane dissociation, the H 2 signal appears later than CO, indicating the oxidation reaction of CHx occurs after the dissociation of CO 2 . Besides, TG analysis tells us the H 2 O may consume Cα on the catalyst in time during the reaction process to remove carbon deposition.
研究领域:
化学工程
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催化科学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2023
·
IF 7.4
Jiale Gu,Huan Li,Wencai Peng,Di Zhu,Jiajia Chen,Shengjie Luo,Siming Liu,Wenxiang Zhao,Youqing Wu,Sheng Huang,Shiyong Wu
The hydrogenation properties of dibenzyl ether (an oxygenated model compound of lignite) via the water–gas shift reaction (WGSR) were studied in a subcritical CO-H 2 O system. The result showed during the hydrogenation process, the C-O bond was broken, and the fragments of dibenzyl ether were stabilized by the hydrogen generated by WGSR, generating benzene, toluene, benzyl alcohol and benzaldehyde. The presence of excess water inhibited the hydrogen transfer, largely reducing the conversion of dibenzyl ether. However, the inhibition effect was substantially reduced when the reaction environment reached the critical temperature and subcritical pressure of water. The hydrogen and deuterium generated by H 2 O and D 2 O via WGSR were utilized to label and analyze the hydrogenation position of the product, respectively. The results showed that the hydrogen generated by WGSR was added to the methylene after the break of dibenzyl ether, and this hydrogen appeared on the benzene ring structure via hydrogen transfer. The bond dissociation energy and energy required for the hydrogenation process of dibenzyl ether under aqueous condition were calculated by utilizing density functional theory (DFT). First, hydrides (H − ) are formed by the WGSR under alkaline conditions. Then, the formation energy (140.81 kJ/mol) of hydrides and the energy (15.54 kJ/mol) of hydrides attacking the dibenzyl ether to form the transition state were lower than the bond dissociation energy (259.26 kJ/mol) of the dibenzyl ether. That is, the hydrogenation of dibenzyl ether via WGSR prefers to be a nucleophilic reaction rather than a pyrolysis reaction. In the coal liquefaction process, the hydrides produced by WGSR under the catalysis of alkali is conducive to the hydrocracking of oxygen containing functional groups.
研究领域:
化学工程
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能源科学
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催化反应
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
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IF 2.5
Junying Fu,Min Lu,Kejing Fang,Pengmei Lv,Zuhong Xiong
Biodiesel, a renewable liquid fuel, is undergoing eco-transition in catalyst research and development. Calcium oxide (CaO) was a widely studied heterogeneous catalyst due to its considerable activity. However, the poor stability of CaO during storage in air, especially by CO2 and H2O poisoning, presents a challenge. This research successfully developed a high-activity CaO/La2O3 catalyst for biodiesel production with CaO nanoparticles well-dispersed on the La oxide support (Ca/La=0.12). Under mild reaction conditions, a fatty acid methyl esters (FAMEs) yield of 96.9% was achieved. After exposure to air for two weeks, the CaO/La2O3 (Ca/La=0.12) catalyst absorbed 49% less CO2 and 91% less water than pure CaO and keeps 71.4% of the original activity. Thermogravimetric and in-situ Fourier Transform Infrared Spectroscopy analysis reveal that CO2 and H2O will preferentially be captured by La oxides and keep the supported CaO active sites safe. DFT calculations confirmed that CO2 and H2O adsorption on CaO terrace sites became an unfavoured process due to lattice compression of CaO nanoparticles on La2O3, which imparts the CO2/H2O-proof property to CaO/La2O3 catalyst. Methanol adsorption, dissociation, and migration pathways on CaO/La2O3 that produce active methoxy anions at Ca-La interfaces were identified as key steps in achieving efficient catalytic reactions.
研究领域:
化学工程
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催化材料
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可再生能源
✓ 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）