JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2026
·Vol. 71
·期 9
·3749-3760
·
IF 2.4
Zhuang Ziyu,Zhang Manman,Li Dongdong,Gao Dandan,Feng Haitao
The phase equilibria of ternary systems
phenylboronic
acid (C 6 H 5 B(OH) 2 ) + KCl/RbCl/CsCl
+ H 2 O were investigated at 298.15 and 348.15 K using
a direct
isothermal dissolution equilibrium method with mannitol-NaOH titration.
Solid phases were characterized by Schreinemakers’ wet method,
XRD, Raman, IR, and TG-DSC. No new adducts were detected, in contrast
to the stable adduct 2H 3 BO 3 ·3CsCl formed
in the H 3 BO 3 + CsCl + H 2 O system.
All three systems are of the simple eutectic type, with two solubility
branches and one invariant point. C 6 H 5 B(OH) 2 exerts a weak salting-in effect on the chlorides, independent
of temperature. Conversely, the chlorides salt out C 6 H 5 B(OH) 2 following the order CsCl < RbCl < KCl,
an effect that increases with temperature. This pattern differs from
H 3 BO 3 -alkali chloride systems (salting-in) but
resembles H 3 BO 3 -alkaline earth chloride systems
(salting-out). The salting-out is attributed to salt-induced reduction
of water activity, which disrupts the hydration layer of the solute
and promotes its dehydration condensation to triphenyl boroxine. From
a crystallographic viewpoint, the layered structure of H 3 BO 3 provides suitable sites for Cs + , whereas
the three-dimensional network of C 6 H 5 B(OH) 2 does not. This structural insight suggests that the layered
1,4- and 1,3-benzenediboronic acids may form similar adducts with
Cs + , warranting further investigation.
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RSC Advances
·
2015
·Vol. 6
·期 4
·3235-3242
·
IF 3.84
Jun Hu,Yue Ding,Haidong Zhang,Peng Wu,Xiaohong Li
At near ambient temperature, Ru nanoparticles entrapped in ordered mesoporous carbons (OMCs) CMK-3 show superior efficiency in the green reduction process of nitrobenzene and its derivatives with hydrazine monohydrate as a hydrogen donor using water as solvent. The Ru/CMK-3 catalyst exhibited much higher activity than a commercial Ru/C catalyst purchased from Alfa Aesar toward the reduction of nitrobenzene with hydrazine monohydrate under the same conditions. The interaction of Ru nanoparticles with CMK-3 and the mesoporous structure of CMK-3 OMCs might play important roles in determining the catalytic performance of the Ru/CMK-3 catalyst. In addition, the catalytic performance of the Ru/CMK-3 catalyst for the reduction of nitrobenzene was also compared using different hydrogen sources. Hydrazine monohydrate was found to be suitable as a hydrogen donor for the reduction of nitrobenzene and its derivatives. Compared with those obtained in the reduction of nitrobenzenes using 4.0 MPa hydrogen, the catalytic activity of the Ru/CMK-3 catalyst obtained using hydrazine monohydrate as hydrogen donor was much higher in most cases.
研究领域:
催化化学
·
材料化学
·
绿色化学
·
纳米材料
·
有机合成
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Polymers
·
2019
·Vol. 11
·期 12
·2121
·
IF 3.164
Yulong Jin,Liang Chen,Xing Guo,Linfeng Xu,Zhihua Zhu,Zhen Liu,Ruihua Cheng,Boping Liu
A complexed initiating system AlCl3·phenetole/TiCl4·H2O was prepared by simply compounding AlCl3/phenetole and TiCl4/H2O and used for cationic polymerization of isobutylene. It was found AlCl3·phenetole/TiCl4·H2O exhibited activities 1.2–3 times higher than those of AlCl3/phenetole, and more than an order of magnitude higher than those of TiCl4/H2O, which indicated a notable synergistic effect produced in the complexed system. In addition, due to the higher activity of AlCl3·phenetole/TiCl4·H2O, lower coinitiator concentration and polymerization temperature, as well as higher monomer concentration were more favored for this complexed initiating system to produce polyisobutylene (PIB) with reasonable molecular weight (Mw) and molecular weight distribution (MWD). Furthermore, high molecular weight polyisobutylene (HPIB) with Mw= 1–3 × 105g·mol−1could be successfully produced by the complexed catalyst system at Tp= −60 to −40 °C. As a whole, the high activity as well as the simple preparation procedures of the complexed initiating system offer us a unique approach for the production of HPIB with improved efficiency.
研究领域:
高分子化学
·
材料科学
·
催化
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CHEMICAL ENGINEERING SCIENCE
·
2026
·
IF 5.1
Zhenpan Chen,Huibin Liu,Jie Cai,Gexing Meng,Liqin Zeng,Cen Zhang,Fangfang Zhao,Kuiyi You,He’an Luo
Chemical looping technology offers promising opportunities for converting CO 2 /H 2 O to high value-added products (e.g., CO, H 2 , and C 2 H 2 ) by using well designed metal oxides as oxygen carriers. Herein, the calcium oxide (CaO) was used as oxygen carrier to synthesize acetylene (C 2 H 2 ) from inorganic carbon material (e.g., active carbon (AC)) and H 2 O via chemical looping route, which is constituted by two basic steps: solid-phase synthesis of calcium carbide (CaC 2 ) (redox reaction) and C 2 H 2 production (metathesis reaction). To further enhance the energy utilization efficiency of this chemical looping process, transition metal oxides (ZrO 2 , La 2 O 3 , and Y 2 O 3 )-based catalysts were used to promote the solid-phase redox reaction between CaO and carbon reactants. Compared with blank test, 5 wt% cubic Y 2 O 3 as a catalyst that added into CaO-AC mixture can further increase the CaO conversion by ∼40% under optimal conditions and the onset solid-phase reaction temperature between CaO and AC decreases to ∼1620 °C. This catalytic effect is ascribed to the enhanced chemical reaction at the solid–solid interface of CaO and AC reactants and promoted ionic conductivity (e.g., Ca 2+ , O 2– conduction) of the bulk after adding Y 2 O 3 catalyst, leading to a decreased average apparent activation energy ( E a ) (∼909 kJ mol −1 ) of CaC 2 formation. Our work demonstrates that constructing of catalytic solid-phase reaction system by adding selected transition metal oxides as catalysts can effectively reduce the E a of solid-phase CaC 2 synthesis and enhance the overall efficiency of chemical looping synthesis of C 2 H 2 , which sheds light to synthesize organic compounds from inorganic materials in large scale.
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JOURNAL OF CHEMICAL THERMODYNAMICS
·
2023
·
IF 2.6
Xiaomeng Liu,Mengying Chen,Guoyuan Xiong,Yafei Guo,Lingzong Meng,Tianlong Deng
The phase equilibria of the ternary system at 298.15 and 338.15 K were investigated by the isothermal dissolution equilibrium and wet-reside solid phase (Schreinemarkers rule) methods. The solubilities and the physicochemical properties containing density and refractive index were obtained experimentally. Then, the phase diagrams and the diagrams of physicochemical properties against the composition in the ternary system at two temperatures were proposed. The phase diagrams of this system at two temperatures contain two invariant points, three solubility curves, and three crystallized regions corresponding to NaNO 3 , RbNO 3 and double salt NaRb 2 (NO 3 ) 3 . According to the phase diagrams at 298.15 and 338.15 K, a novel separation process of RbNO 3 from the mixture solution of NaNO 3 was established for the first time, and the separation rate of RbNO 3 in the mixed solution reached 43.75% in a single yield. This work provides an efficient and reliable RbNO 3 green recovery method from the eluent solution of NaNO 3 efficiently.
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ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 28
·2301729
·
IF 19
Youyu Duan,Yang Wang,Weixuan Zhang,Jiangwei Zhang,Chaogang Ban,Danmei Yu,Kai Zhou,Jinjing Tang,Xu Zhang,Xiaodong Han,Liyong Gan,Xiaoping Tao,Xiaoyuan Zhou
Photocatalytic conversion of CO 2 into fuels using pure water as the proton source is of immense potential in simultaneously addressing the climate-change crisis and realizing a carbon-neutral economy. Single-atom photocatalysts with tunable local atomic configurations and unique electronic properties have exhibited outstanding catalytic performance in the past decade. However, given their single-site features they are usually only amenable to activations involving single molecules. For CO 2 photoreduction entailing complex activation and dissociation process, designing multiple active sites on a photocatalyst for both CO 2 reduction and H 2 O dissociation simultaneously is still a daunting challenge. Herein, it is precisely construct Cu single-atom centers and two-coordinated N vacancies as dual active sites on CN (Cu 1 /N 2C V-CN). Experimental and theoretical results show that Cu single-atom centers promote CO 2 chemisorption and activation via accumulating photogenerated electrons, and the N 2C V sites enhance the dissociation of H 2 O, thereby facilitating the conversion from COO* to COOH*. Benefiting from the dual-functional sites, the Cu 1 /N 2C V-CN exhibits a high selectivity (98.50%) and decent CO production rate of 11.12 µmol g −1 h −1 . An ingenious atomic-level design provides a platform for precisely integrating the modified catalyst with the deterministic identification of the electronic property during CO 2 photoreduction process.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2023
·
IF 2.6
Liwei Zhuang,Qinqin Hu,Shujing Wang,Ruyi Lin,Dan Li,Yong Ma,Lingzong Meng,Jiaoyu Peng
The solid–liquid phase equilibria of brine systems containing boric acid are the theoretical basis for the development of boric acid from brine resources. The phase equilibria of the systems NaCl–CaCl2–H3BO3–H2O and CaCl2–H3BO3–H2O at 323.15 K were investigated by the isothermal solution method. The phase diagram for the ternary system is composed of one co-saturation point, two univariant solubility curves, and two singe-salt crystallization fields of CaCl2·2H2O and H3BO3. The dry-salt phase diagram for the quaternary system consists of one invariant point, three univariant solubility curves, and three single-salt crystallization fields for NaCl, CaCl2·2H2O, and H3BO3. In the phase diagrams of the quaternary system at 298.15 and 323.15 K, the areas of sodium chloride and calcium chloride salt regions are enlarged, whereas the area of the H3BO3 region is diminished significantly with the increase of temperature. Using the Pitzer model, the lacking Pitzer parameters for H3BO3 were obtained by fitting the solubilities in the CaCl2–H3BO3–H2O system. The calculated solubilities with the Pitzer model were in accord with the experimental data.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2023
·
IF 2.6
Tingting Zhou,Xueli Huang,Baharguli Hadeerbieke,Fangning Yan,Xueying Wang,Qinglong Luo
The phase diagram can guide the comprehensive utilization of salt lake brine, particularly lithium extraction. In this paper, the study on phase equilibria of the quinary system Li+, Na+, K+, Mg2+//Cl––H2O saturated with NaCl·2H2O and its subsystem Li+, Na+, Mg2+//Cl––H2O at 258.15 K were carried out using the isothermal dissolution equilibrium method. Based on the experimental data, equilibrium diagrams for stable phases were plotted. For the equilibrium diagram of the quaternary system Li+, Na+, Mg2+//Cl––H2O at 258.15 K, there are two invariant points, five univariant curves, and four crystallization fields. The quinary system Li+, Na+, K+, Mg2+//Cl––H2O saturated with NaCl·2H2O at 258.15 K contains three invariant points, seven univariant curves, and five crystallization fields. Comparing the phase diagram of the system at 258.15 K to that at 298.15 K reveals that, except KCl, all crystallization zones have decreased, and LiCl·MgCl2·7H2O has the smallest crystallization zone compared to the other salts in the systems. This fundamental research could be valuable for promoting comprehensive utilization of the lithium-containing salt lake brine.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2022
·
IF 3.119
Xiaohui Song,Jinqiu Ma,Lingzong Meng,Tianlong Deng,Yafei Guo,Yong Ma,Dan Li
The solubilities, refractive indices, and pH values in the NaCl–Na2SO4–NaHCO3–H2O system at 323.15 K were determined by the isothermal solubility method. The dry-salt diagram of the system consists of three isothermal solubility curves saturated with two salts, one invariant point, and three crystallization regions of NaCl, Na2SO4, and NaHCO3. Two models were applied to predict the solubilities in the system based on the Pitzer model. Model I assumes that there is only one carbon species HCO3– in the solution. Model II supposes that there are three carbon species corresponding to HCO3–, CO32–, CO2(aq), and OH– in the solution. Both the computed solubilities with the two models were basically consistent with experimental results. The concentrations of HCO3–, CO32–, CO2(aq), and OH– were calculated by model II. The dominant form of carbon species is HCO3–, and the concentrations of CO32– and CO2(aq) in the sodium bicarbonate solution can be neglected. Model II can be used to describe the experimental pH values. The mean activity coefficients of NaCl, Na2SO4, and NaHCO3, osmotic coefficients, and water activities were also calculated with the Pitzer model.
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Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Longfei Zhao,Xin Chen,Yuan Zhang,Zhupeng Ye,Yanwei Zeng
In this paper, controllable nucleation and growth of CdS nanodots on the (020)-featured WO 3 ·H 2 O nanoplates has been successfully accomplished to prepare CdS-WO 3 ·H 2 O heterojunction with high-quality interfacial contact through a slow release of Cd 2+ and S 2- from the gradual self-loop hydrolysis of cadmium acetate and thioacetamide. The chemical and structural characteristics of as-prepared samples before and after heat treatment are detailedly investigated by TG-DSC, XRD, Raman, XPS, FESEM and HRTEM, as well as their light absorption performance from UV-Vis DRS. The maximum average hydrogen production rate for CdS-WO 3 ·H 2 O reaches 2.15 mmol·g −1 ·h −1 under 300 W Xe lamp irradiation (λ > 420 nm) using lactic acid as sacrificial reagent, which is 8.27 and 2.72 times as much as CdS and CdS-WO 3 , respectively. According to band alignment, CdS-WO 3 ·H 2 O exhibits greater energy difference of Fermi level than CdS-WO 3 , and augmented photocatalytic performance should arise from efficient Z-scheme charge transfer mechanism under stronger built-in electric field, in which the conduction band electrons of WO 3 ·H 2 O and valence band holes of CdS are expected to effectively recombine at their interfacial zones, while the conduction band electrons of CdS and valence band holes of WO 3 ·H 2 O contribute to the reduction of H + and oxidation of lactic acid.
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CELLULOSE
·
2022
·Vol. 29
·期 4
·2257-2272
·
IF 6.123
Shi Ning,Zhu Yuju,Qin Bangzhi,Liu Ying,Zhang Hongyan,Huang Hongsheng,Liu Yunhua
A simple and efficient biphasic system comprising H 2 O, tetrahydrofuran (THF), cyclohexane (CHX) and Al 2 (SO 4 ) 3 was employed to convert cellulose into 5-hydroxymethylfurfural (HMF). The volume ratio of the organic phase to the aqueous phase (V org /V aque ), concentration of Al 2 (SO 4 ) 3 in the aqueous phase (C[Al 2 (SO 4 ) 3 ] aque ) and concentration of Al 2 (SO 4 ) 3 in the organic phase (C[Al 2 (SO 4 ) 3 ] org ) of the biphasic system played critical roles in the conversion of cellulose into HMF. In the biphasic systems with H 2 O/THF/Al 2 (SO 4 ) 3 of 4/18/0.4 and H 2 O/THF/CHX/Al 2 (SO 4 ) 3 of 3/16/3/0.4, > 80% of the added H 2 O was dissolved in the organic phase, whereas most of the added Al 2 (SO 4 ) 3 remained in the aqueous phase under the reaction temperature, jointly leading to high V org /V aque , high C[Al 2 (SO 4 ) 3 ] aque and low C[Al 2 (SO 4 ) 3 ] org in the biphasic system. All of these results yield the excellent performance of these biphasic systems in the conversion of cellulose into HMF. The addition of CHX into the biphasic system can decrease the solubility of Al 2 (SO 4 ) 3 in the organic phase, thus improving the stability of HMF in the reaction system. The influences of catalyst usage, reaction temperature and time, and cellulose/solvent ratio were all explored, and a high HMF yield of 71.2% was obtained in the H 2 O–THF–CHX biphasic system with an H 2 O/THF/CHX volume ratio of 3/16/3 under optimized conditions. Graphical abstract
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CATALYSIS LETTERS
·
2021
·Vol. 152
·期 9
·2688-2694
·
IF 3.186
Cai Mingzhong,Liu Rong,Xu Caifeng,Huang Bin
Pd(OAc) 2 /XPhos–SO 3 Na in a mixture of poly(ethylene glycol) (PEG-400) and water is shown to be a highly efficient catalyst for the cyanation of aryl chlorides with potassium ferrocyanide. The reaction proceeded smoothly at 100 or 120 ºC with K 2 CO 3 or KOAc as base, delivering a variety of aromatic nitriles in good to excellent yields. The isolation of the crude products is facilely performed by extraction with cyclohexane and more importantly, both expensive Pd(OAc) 2 and XPhos–SO 3 Na in PEG-400/H 2 O system could be easily recycled and reused at least six times without any apparent loss of catalytic efficiency. Graphical Abstract Palladium-catalyzed cyanation of aryl chlorides with potassium ferrocyanide leading to aryl nitriles by using Pd(OAc) 2 /XPhos–SO 3 Na/PEG-400/H 2 O as a highly efficient and recyclable catalytic system is described.
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