INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2015
·
IF 2.587
Xia Zhang,Qiuxiang Yin,Wei Du,Junbo Gong,Ying Bao,Meijing Zhang,Baohong Hou,Hongxun Hao
The crystal structures of monohydrate and anhydrous substance were determined from the single crystals for the first time. The phase transformation between anhydrate and monohydrate of sodium dehydroacetate was in situ investigated by using Raman spectroscopy. The mechanism of the phase transformation was proposed. The results showed that the monohydrate crystalline phase of sodium dehydroacetate can transform to anhydrous phase through solid–solid transformation upon heating or solution-mediated phase transformation. From powder X-ray diffraction (PXRD) patterns and thermal gravimetric analysis (TGA) data, it was found that the anhydrous crystals obtained by these two methods are the same in structure. However, the scanning electron microscopy (SEM) results revealed that the surface of the anhydrous sodium dehydroacetate crystals obtained by high-temperature dehydration was much rougher than that obtained by solution-mediated phase transformation. Furthermore, the dynamic vapor sorption (DVS) results showed that the anhydrous crystals with rough surface had faster hydration rate than the anhydrous crystals with smooth surface when increasing humidity. The reasons behind these phenomena were discussed.
研究领域:
药物化学
·
晶体学
·
药剂学
·
材料科学
·
物理化学
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Chen Chen,Yu Liang,Qiong Tang,Dong Li,Lei Liu,Jinxiang Dong
The hydrogenolysis of glycerol to 1,3-propanediol has an important industrial value but remains a great challenge. Herein, a tungsten oxide hydrate (WO3·H2O) containing Brønsted acid sites and surface oxygen vacancies was in situ grown on the surface of alumina. The coordination chemistry of WO3 on the carrier contributes to the extremely dispersed platinum and the excellent acidic property, and much more Pt–O–W interfaces are created. The synthetic Pt/H–WO3/γ-Al2O3 catalyst exhibited much higher catalytic performance for glycerol hydrogenolysis than Pt/C–WO3/γ-Al2O3, in which C–WO3/γ-Al2O3 was routinely prepared by calcining the tungsten precursor (AMT) pre-impregnated on γ-Al2O3. The success for this strategy lies in the pre-control toward the state of WO3 on the support, and several characterization techniques were performed to reveal the structure–property relationship.
研究领域:
催化化学
·
材料化学
·
工业化学
·
应用化学
·
能源化学
✓ 已验证
DOI
高影响因子
Advanced Materials Interfaces
·
2020
·Vol. 7
·期 12
·2000010
·
IF 4.948
Puttaswamy Madhusudan,Run Shi,Bananakere Nanjegowda Chandrashekar,Shengling Xiang,Ankanahalli Shankaregowda Smitha,Weijun Wang,Haichao Zhang,Xian Zhang,Abbas Amini,Chun Cheng
Solar water splitting using semiconductor photocatalysts is considered to be one of the economical and significant techniques for hydrogen evolution. In this study, graphene–Zn x Cd 1− x S (ZCS) heterojunction is fabricated by hydrothermal method followed by simple photodeposition of ultrathin few layers of molybdenum sulfide (MoS 2 ) nanosheets. The results show that compared with pristine ZCS and 1 wt% graphene mixed ZCS photocatalysts, the 1 wt% graphene and 1 wt% MoS 2 photodeposited ZCS composited sample shows 39.5 mmol h −1 g −1 hydrogen production activity, which is 6.9 and 1.9 times significantly higher, respectively, with an apparent quantum yield of 53% at 420 nm visible light is recorded. The improved photocatalytic activity can be attributed to the formation of heterostructure interface between p-type MoS 2 nanosheets with n-type ZCS host, which allows for the faster transfer of the photogenerated electrons and thus significantly promotes the separation of photogenerated charge carriers.
研究领域:
材料化学
·
光催化
·
能源科学
·
纳米材料
·
半导体物理
·
可持续能源
·
表面科学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2018
·
IF 11.698
Yi Liu,Yuliu Liu,Yi Zhang
Aqueous-phase hydrogenation of glucose to lower diols (ethylene glycol (EG), 1, 2-propylene glycol (PG), and butanediol (BDO)) over bi-functional Ru-W supported catalysts was investigated in a continuous-flow fixed-bed reactor. A variety of catalysts based on different supports including mesoporous SiO 2 , activated carbon (AC), carbon nanofibers (CNFs), and bulk WO 3 were compared and examined by N 2 physisorption, H 2 chemisorption, XRD, TEM, ICP, H 2 -TPR, in-situ / ex-situ XPS, NH 3 -TPD, and Raman spectra. The results indicate that the lower diols yield is highly dependent on the synergistic effect of Ru metal sites and WO x acid sites, in other words, strongly depending on the competitive reactions of the glucose. Abundant W 4+ and Ru° sites on Ru-W/SiO 2 catalysts with large specific surface area effectively catalyze the selective cleavage of the C C bonds in glucose and subsequent hydrogenation to lower diols, resulting in 100% glucose conversion as well as highest diols selectivity (87.3%) over 50 h reaction at 478 K and 4 MPa H 2 . Meanwhile, the Ru/WO 3 with much lower surface area forms more W 5+ species, which is advantageous to producing more EG products (55.9%) at the same reaction conditions.
研究领域:
催化化学
·
生物质转化
·
绿色化学
·
多相催化
·
能源化工
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Yudi Niu,Xing Qian,Chong Xu,Hongyu Liu,Weimin Wu,Linxi Hou
A series of porous cubic nanomaterials have been prepared through a facile one-step selenylation process, in which Cu-Ni-Co, Ni-Co and Cu-Co Prussian-blue analog nanocubes transformed to Cu-Ni-CoSe x , Ni-CoSe x and Cu-CoSe x nanocubes, respectively. Among these samples, the quaternary porous nanocubes (Cu-Ni-CoSe x ) proved to be the excellent bifunctional electrocatalysts in dye-sensitized solar cells and hydrogen evolution reactions. Under the standard irradiation, Cu-Ni-CoSe x nanocubes exhibited a high power conversion efficiency of 9.74% in solar cells, which was much superior than that of Pt (8.19%). Cu-Ni-CoSe x nanocubes also delivered superb hydrogen evolution performance in terms of a low overpotential (50.2 mV) under the current density of 10 mA cm −2 and a low Tafel slope (49.6 mV dec −1 ) in alkaline medium. The outstanding characteristics of Cu-Ni-CoSe x nanocubes were benefited from their uniform sizes, porous morphologies, high surface area, low charge transfer resistances and good synergies among multiple elements.
研究领域:
材料化学
·
电化学
·
纳米能源材料
·
可再生能源
·
催化化学
·
太阳能转换
✓ 已验证
DOI
高影响因子
ANALYST
·
2019
·Vol. 144
·期 8
·2716-2724
·
IF 4.019
Zunfu Hu,Yongheng Yin,Qingyun Liu,Xiuwen Zheng
The rapid and sensitive detection of H2O2 is of great importance for a series of industries. In this work, surface-modified FePt nanoparticles were loaded into metal–organic frameworks (MOFs, MIL-101(Fe)) in a facile in situ way and the resulting material (FePt@MOFs NCs) acted as a high efficient colorimetric detection agent. The as-prepared FePt@MOFs NCs possess a well-defined octahedron shape and high stability in water. Via the oxidation reaction of the chromogenic substrate 4,4′-bi-2,6-xylidine, the obtained FePt@MOFs NCs were proved to possess prominent peroxidase-mimic activity. Under the most favorable conditions, the linear range for H2O2 detection was 40 μM to 800 μM and the detection limit was 18.9 μM. Furthermore, FePt@MOFs NCs were successfully applied to the detection of H2O2 in real samples such as fruit juice. The developed colorimetric sensing platform is expected to have potential for the exact detection of H2O2 for the food, mining and bio-pharmaceutical industries, due to its high stability, sensitivity, rapidness and easy preparation.
研究领域:
分析化学
·
纳米生物技术
·
食品分析
·
环境监测
·
生物传感
·
材料科学
·
分子诊断
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 37
·17809-17816
·
IF 3.925
Binyao Liu,Longgang Yan,Jinyu Wen,Xiaotian Liu,Feng Duan,Bi Jia,Xiaoyan Liu,Gaili Ke,Huichao He,Yong Zhou
Relative to the traditional homogeneous Fenton process, the heterogeneous photo-Fenton system has superiorities in terms of the cost, pH range of application, and environmental compatibility for the degradation of organic pollutants. For the development of an effective heterogeneous photo-Fenton system, the most important part is the photocatalyst that can produce H2O2 and further activate it into free radicals (˙OH, ˙O2−). Here, composites of FeOOH and resorcinol–formaldehyde resin (RFS) were prepared by coupling an FeOOH thin layer on the surface of RFS nanospheres, and the resultant composites were investigated as photocatalysts for the construction of a heterogeneous photo-Fenton system. In the FeOOH/RFS composite-based system, H2O2 can be produced via the reduction of dissolved oxygen through RFS nanosphere photocatalysis under visible-light irradiation. Meanwhile, the Fe3+ of FeOOH can be partially reduced to Fe2+ by the photogenerated electrons of the FeOOH/RFS composites. Through the reaction of H2O2 with Fe2+, ˙OH is continuously produced to initiate the effective degradation of rhodamine B (RhB) and dimethyl phthalate (DMP). Our work presents an efficient heterogeneous photo-Fenton system to achieve the degradation of organic pollutants, which could inspire the development of a similar photo-Fenton system for environmental protection.
研究领域:
环境化学
·
材料科学
·
催化化学
·
环境污染与控制
·
光催化
✓ 已验证
DOI
高影响因子
Nano Research
·
2023
·Vol. 17
·期 5
·3752-3760
·
IF 9.9
Chong Ben,Xu Baorong,Li He,Ou Honghui,Yang Guidong
The diffusion, adsorption/desorption behaviors of water molecules and hydrogen molecules are of great importance in heterogeneous photocatalytic hydrogen production. In the study of structure–property–performance relationships, nanoconfined space provides an ideal platform to promote mass diffusion and transfer due to their extraordinary properties that are different from the bulk systems. Herein, we designed and prepared a nanoconfined CdS@SiO 2 -NH 2 nanoreactor, whose shell is composed of amino-functionalized silica nanochannels, and encapsulates spherical CdS as a photocatalyst inside. Experimental and simulated results reveal that the amino-functionalized nanochannels promote water molecules’ and hydrogen molecules’ directional diffusion and transport. Water molecules are enriched in the nanocavity between the core and the shell, and promote the interfacial photocatalytic reaction. As a result, the maximized water enrichment and minimized hydrogen-occupied active sites enable photocatalyst with optimized mass transfer kinetics and localization electron distribution on the CdS surface, leading to superior hydrogen production performance with activity as high as 37.1 mmol·g −1 ·h −1 .
研究领域:
纳米技术
·
光催化
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
STRUCTURAL CHEMISTRY
·
2023
·Vol. 35
·期 3
·967-975
·
IF 1.7
Shen Zheng,Chen Jian,Ge Jilong,Cai Zhuoer,Hua Xiu-Ni,Sun Baiwang
Two pharmaceutical salts of paliperidone, namely, paliperidone benzoate (PLPT·BA) and paliperidone salicylate (PLPT·SA), were successfully synthesized using benzoic acid (BA) and salicylic acid (SA) as starting materials through a solvent evaporation method. Our study rectified the misidentification of PLPT·BA as a co-crystal in previous research by providing single-crystal structure data and further analysis. The salts’ structures were confirmed through ΔpKa calculations, single-crystal x-ray diffraction (SCXRD) analysis, powder x-ray diffraction (PXRD), and infrared (IR) spectroscopy, while their solubility was also evaluated. Moreover, significant enhancements in thermal stability were observed for both PLPT·BA and PLPT·SA, with increases of 39 K and 32 K, respectively, in their decomposition temperatures compared to pure PLPT. Additionally, intramolecular charge-assisted hydrogen bonds (N + –H···O) were found in both salts, which crystallized in the monoclinic system with the \(P\overline{1}\) P-1 (2) space group. Furthermore, solubility and dissolution rate experiments indicated slight improvements in their solubility and dissolution rate compared to PLPT. This pioneering research provides crucial data on the single-crystal structures and thermal properties of PLPT·BA and PLPT·SA, laying a foundation for further investigations into their potential applications in drug formulations and pharmacology and optimizing drug formulations for enhanced clinical efficacy.
研究领域:
药物化学
·
晶体学
·
材料科学
·
药物研发
·
物理化学
✓ 已验证
DOI
高影响因子
Frontiers of Chemical Science and Engineering
·
2022
·Vol. 17
·期 2
·139-155
·
IF 4.803
Shi Haonan,Gu Xiaoyu,Shi Yinteng,Wang Dandan,Shu Sihao,Wang Zhongze,Chen Jixiang
Porous carbon-encapsulated Ni and Ni–Sn intermetallic compound catalysts were prepared by the one-pot extended Stöber method followed by carbonization and tested for in-situ hydrothermal deoxygenation of methyl palmitate with methanol as the hydrogen donor. During the catalyst preparation, Sn doping reduces the size of carbon spheres, and the formation of Ni–Sn intermetallic compounds restrain the graphitization, contributing to larger pore volume and pore diameter. Consequently, a more facile mass transfer occurs in carbon-encapsulated Ni-Sn intermetallic compound catalysts than in carbon-encapsulated Ni catalysts. During the in-situ hydrothermal deoxygenation, the synergism between Ni and Sn favors palmitic acid hydrogenation to a highly reactive hexadecanal that easily either decarbonylate to n -pentadecane or is hydrogenated to hexadecanol. At high reaction temperature, hexadecanol undergoes dehydrogenation-decarbonylation, generating n -pentadecane. Also, the C-C bond hydrolysis and methanation are suppressed on Ni-Sn intermetallic compounds, favorable for increasing the carbon yield and reducing the H 2 consumption. The n -pentadecane and n -hexadecane yields reached 88.1% and 92.8% on carbon-encapsulated Ni 3 Sn 2 intermetallic compound at 330 °C. After washing and H 2 reduction, the carbon-encapsulated Ni 3 Sn 2 intermetallic compound remains stable during three recycling cycles. This is ascribed to the carbon confinement that effectively suppresses the sintering and loss of metal particles under harsh hydrothermal conditions.
研究领域:
催化
·
化学工程
·
材料科学
·
能量转换
·
有机化学
✓ 已验证
DOI
高影响因子
Science Advances
·
2023
·Vol. 9
·期 3
·
IF 13.6
Chunhui Zhang,Zhe Xu,Nana Han,Ye Tian,Tanja Kallio,Cunming Yu,Lei Jiang
Hydrogen evolution reaction (HER), as an effective method to produce green hydrogen, is greatly impeded by inefficient mass transfer, i.e., bubble adhesion on electrode, bubble dispersion in the vicinity of electrode, and poor dissolved H2 diffusion, which results in blocked electrocatalytic area and large H2 concentration overpotential. Here, we report a superaerophilic/superaerophobic (SAL/SAB) cooperative electrode to efficiently promote bubble transfer by asymmetric Laplace pressure and accelerate dissolved H2 diffusion through reducing diffusion distance. Benefiting from the enhanced mass transfer, the overpotential for the SAL/SAB cooperative electrode at −10 mA cm−2 is only −19 mV, compared to −61 mV on the flat Pt electrode. By optimizing H2SO4 concentration, the SAL/SAB cooperative electrode can achieve ultrahigh current density (−1867 mA cm−2) at an overpotential of −500 mV. We can envision that the SAL/SAB cooperative strategy is an effective method to improve HER efficiency and stimulate the understanding of various gas-involved processes.
研究领域:
电化学
·
能量转换
·
材料科学
·
纳米技术
·
化学工程
✓ 已验证
DOI
高影响因子
ENERGY & FUELS
·
2017
·
IF 3.091
Shiwei Ma,Shiyi Chen,Ahsanullah Soomro,Wenguo Xiang
Fe2O3 is an excellent active metal oxide for chemical looping hydrogen generation (CLHG) with high conversion of CO to CO2 in the reduction stage, and high H2 mole fractions in the subsequent steam oxidation stage, especially for its low cost and abundance in nature. However, supports are generally used to improve its reactivity and stability and to eliminate its carbon deposition. In this paper, Fe-based oxygen carriers are prepared by a coprecipitation method with three supports, i.e., CeO2, ZrO2, and Al2O3. The reactivity, carbon deposition, redox stability, and sintering characteristics of the oxygen carriers are analyzed to investigate the effects of supports as well as the fundamental mechanism. The results show that the properties of the oxygen carriers highly rely on the support and its interaction with iron oxide. The oxygen carrier supported on Al2O3 exhibits poor reactivity and stability, and the oxygen carrier supported on ZrO2 leads to much carbon deposition, decreasing H2 purity, despite its high reactivity and stability. Nevertheless, the oxygen carrier supported on CeO2 demonstrates good reactivity and stability with no carbon deposition observed, and the reducible support CeO2 counteracts the negative effect originating from sintering and guarantees the reactivity and stability of Fe2O3/CeO2 due to its oxygen mobility property and the oxygen mobility enhancement originating from the formation of Fe–Ce solid solution and perovskite-type CeFeO3. Overall, the reducible CeO2 is a potential support to improve the redox characteristics of iron oxygen carrier in CLHG, and the Fe2O3/CeO2 exhibits the highest reactivity at 850 °C. In addition, all three oxygen carriers are characterized by scanning electron microscopy images, energy dispersive X-ray spectrometer analysis, and X-ray diffraction patterns before and after the redox cycles.
研究领域:
能源技术
·
材料科学
·
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）