POWDER TECHNOLOGY
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2022
·
IF 5.64
Jie Yin,Jun Zhang,Li Lv,Hui Zhong
Heterogeneous condensation preconditioning technology has generated broad interest in removing fine particles from coal-fired flue gas due to its economic and environmental advantages. Here, a flow cloud chamber was used to study the effect of 0%–90% CO 2 concentrations on the growth performance of insoluble fine particles with different operational conditions. The results suggest that a higher CO 2 concentration in the particle growth environment is detrimental to the fine particles growth. The higher the CO 2 concentration, the worse the growth performance. The adverse effect of CO 2 on the growth performance decreases with the increase of growth time and the increase of supersaturation caused by temperature, and does not change significantly with the increasing particle concentration.
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Nano Research
·
2024
·Vol. 17
·期 9
·7945-7956
·
IF 9.5
Li Ting,Zhang Zhen-Yu,Luo De-Cun,Xu Bo-Yu,Zhang Rong-Jiang,Yao Ji-Long,Li Dan,Xie Tao
Solar-driven photo-thermal catalytic CO 2 methanation reaction is a promising technology to alleviate the problems posed by greenhouse gases emissions. However, designing advanced photo-thermal catalysts remains a research challenge for CO 2 methanation reaction. In this work, a series of ABO 3 (A = lanthanide, B = transition metal) perovskite catalysts with Ce-substituted LaNiO 3 (La 1− x Ce x NiO 3 , x = 0, 0.2, 0.5, 0.8, 1) were synthesized for CO 2 methanation. The La 0.2 Ce 0.8 NiO 3 exhibited the highest CH 4 formation rate of 258.9 mmol·g −1 ·h cat −1 , CO 2 conversion of 55.4% and 97.2% CH 4 selectivity at 300 °C with the light intensity of 2.9 W·cm −2 . Then the catalysts were thoroughly analyzed by physicochemical structure and optical properties characterizations. The partial substitution of the A-site provided more active sites for the adsorption and activation of CO 2 /H 2 . The sources of the active sites were considered to be the oxygen vacancies (O v ) created by lattice distortions due to different species of ions (La 3+ , Ce 4+ , Ce 3+ ) and exsolved Ni 0 by H 2 reduction. The catalysts have excellent light absorption absorbance and low electron–hole (e − /h + ) recombination rate, which greatly contribute to the excellent performance in photo-thermal synergistic catalysis (PTC) CO 2 methanation. The results of in situ irradiated electron paramagnetic resonance spectrometer (ISI-EPR) and ISI-X-ray photoelectron spectroscopy (XPS) indicated that the aggregation of unpaired electrons near the defects and Ni metal (from La and Ce ions to O v and Ni 0 ) accelerated adsorption and activation of CO 2 /H 2 . At last, the catalyst properties and structure were correlated with the proposed reaction mechanism from the in situ diffuse reflection infrared Fourier transform spectrum (DRIFTS) measurements. The in situ precipitation of the B-site enhanced the dispersion of Ni, while its enriched photoelectrons upon illumination further promote hydrogen dissociation. More H* spillover accelerated the rate-determining step (RDS) of HCOO* hydrogenation. This work provides the theoretical basis for the development of catalysts and industrial application.
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iScience
·
2022
·
IF 6.107
Yuqi Zou,Chao Liu,Zhihe Ren,Yuqi Zhang,Zichang Liu,Yinsheng Xu,Chong Hou,Lvyun Yang,Sheng Liang,Guangming Tao
A small-scale delivery medium for CO 2 laser energy with stable performance, flexibility, and high-strength is crucial in extreme laser processing environments, especially for minimally invasive surgery in high-humidity, twisty and narrow channels. Here, flexible and robust multimaterial infrared fibers made of selenium-based chalcogenide glasses and thermoplastic polymer were developed with a low loss of 7.18 dB/m at 10.6 μm. The resulting fibers were capable of stably delivering single-mode CO 2 laser with 0.42 W average power. Moreover, to achieve precise control over the fibers in the practical clinical environment, customized co-polymers of polyphenylene sulfone resin and polyvinylidene fluoride were used as the fiber built-in jackets. Consequently, the fibers exhibited hydrophobicity, thermostability, high tensile strength, and low bending stiffness. The results demonstrated that the fibers can be used to deliver CO 2 laser energy for fabric cutting and bio-tissues ablation, making them attractive for CO 2 laser material processing and minimally invasive laser surgery.
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ACS Sustainable Chemistry & Engineering
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2022
·
IF 9.224
Songlin Wang,Nan Jiang,Jiali Peng,Peng Yang,Chengxing Cui,Hongying Niu,Qiying Zhang,Jianji Wang
Diphenyl carbonate (DPC) has outstanding practical potential, especially as a key building block for the phosgene-free synthesis of polycarbonate (PC) in the chemical industry. The synthesis of DPC from CO2 has been investigated for decades, but exploring highly efficient catalytic systems is still challenging. Herein, an efficient catalytic system for the direct synthesis of DPC from CO2, phenol, and carbon tetrachloride was developed by using a ZnCl2/copper triflate (Cu(OTf)2) composite catalyst. For the first time, high yield and high selectivity were achieved for DPC synthesis under mild conditions, even at atmospheric pressure. Carefully designed control experiments and DFT studies indicated that the synergistic activation of Cu(OTf)2 and its anion complex with ZnCl2 for phenol and CO2 led to a remarkably improved catalytic activity through a Lewis acid-assisted catalysis. This study not only provides a new strategy for efficient preparation of DPC but also offers an effective pathway for better CO2 utilization.
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REACTIVE & FUNCTIONAL POLYMERS
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2020
·
IF 3.333
Liwei Sun,Jingyi Luo,Ming Gao,Shaokun Tang
Developing solid materials with high CO 2 adsorption capacity and catalytic activity has been a hotspot due to the greenhouse effect. In this work, bi-functionalized ionic liquid 1-vinyl-3-methoxyethyl imidazolium glycinate ([VMOEim][Gly]) was copolymerized with crosslinker divinylbenzene (DVB) to obtain bi-functionalized ionic liquid porous copolymers P( n DVB-[VMOEim][Gly]) and HP( n DVB-[VMOEim][Gly]). These copolymers possess loose stack of small particles or laminates, and they contain mesopores and a small number of micropores. For HP(0.6DVB-[VMOEim][Gly]), surface area reaches up to 508 m 2 ·g −1 and the initial decomposition temperature is about 180 °C. Then these porous copolymers were applied for CO 2 adsorption at 25 °C and cycloaddition reaction of CO 2 with epichlorohydrin under ambient pressure and cocatalyst-free condition. The maximum CO 2 capture capacity is 64.5 mg/g with HP(0.6DVB-[VMOEim][Gly]) as adsorbent. The effects of catalyst type, catalyst dosage, reaction time and temperature on the yield of cyclic carbonate were also investigated. The optimum conditions are 4 wt% of HP(0.6DVB-[VMOEim][Gly]) (based on the epichlorohydrin) as catalyst at 130 °C for 10 h, and the yield of 4-(chloromethyl)-1,3-dioxolan-2-one can reach 94%. Furthermore, the catalytic activity of HP(0.6DVB-[VMOEim][Gly]) maintains and the yield is 91% after five-cycle experiment. The mechanism of cycloaddition reaction was also discussed.
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Nano Energy
·
2020
·
IF 16.602
Jianhua Zhu,Jia Fan,Tianle Cheng,Mengyang Cao,Zhenhe Sun,Rui Zhou,Lu Huang,Dong Wang,Yanguang Li,Yingpeng Wu
Bilayer-Bi 12 O 17 Cl 2 nanosheets (BBNs), a kind of unusual stoichiometric bismuth oxychloride, with abundant oxygen vacancies (OVs) were synthesized by a simple but efficient hydrothermal method , and acted as the generalist material for Potassium-ion battery (PIB) anode and CO 2 reduction reaction. The BBNs with a thickness of ~1.5 nm offer a large electrode-electrolyte contact interface and a short path for K + diffusion. Importantly, the abundant OVs not only provide more active sites but also promote ionic transmission and electrical conductivity . As an anode for PIB, it provides a high initial discharge capacity (627.5 mA h g −1 at 500 mA g −1 ), high rate performance (420 mA h g −1 at 10 A g −1 ) and outstanding cycle performance (198 mA h g −1 after 1500 cycles at 10 A g −1 ). When evaluated as the electrocatalyst for CO 2 reduction, the BBNs exhibited an impressive activity, selectivity and stability ( J HCOO - = 11.5 mA/cm 2 at −0.89 V, Faradaic efficiency >92%, and durability for >12 h). Considering the easy preparation, low cost, and fast-kinetics, this promising strategy and associated opportunities demonstrate great potential for energy storage or electrocatalysts.
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EUROPEAN POLYMER JOURNAL
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2020
·
IF 3.862
Xiaoyun Li,Junwei Wang,Maoqing Kang,Yuhua Zhao,Qifeng Li,Chen Liang
Carbon dioxide based amino-alcohol compound (CO 2 -AA) with both alcohol and amino units in the molecular was prepared by chemical fixation of CO 2 with 1, 4-butanediol diglycidyl ether and ethylenediamine, which was further used as chain extender to the preparation of waterborne polyurethanes (CO 2 -WPUs). Since the reacting activity of isocyanate groups in WPU prepolymer with NH 2 was much faster than that with OH, hydroxyl groups could be maintained in the system and strengthen the hydrogen bonding interaction in WPU endowing the materials with some special properties. Specifically, the unique structure of CO 2 -AA improved mechanical, water/solvents resistance and hydrolysis/oxidation resistance properties of CO 2 -WPUs. Mechanical properties of the CO 2 -WPUs changed slightly during immersion in water, 0.25% NaOH and 6.00% H 2 O 2 solution, while the WPUs prepared from typical chain extender ethylenediamine almost lost their mechanical properties after immersed in the solutions for 5 h. Moreover, the CO 2 -WPU films showed considerable thermal stability. The study suggested the novel CO 2 -AA might be a promising chain extender to improve the water/solvent resistance and hydrolysis/oxidation resistance of WPU.
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FUEL
·
2022
·
IF 8.035
Weiping Liao,Haoyi Lin,Mengdie Yin,Jiaxing Zhang,Zhiguo Zhu,Hongying Lü
The confinement of metal-based matrix such as clusters, particles and even isolated single atoms in zeolite framework was intensively reported, while it was highly untoward to realize this goal for non-metallic ions due to the mutually-exclusive electrostatic interaction between the zeolite framework with negative charges and non-metallic anions. Herein, confinement of iodide ions in Mg-Beta zeolites (I@Mg-Beta) was successfully accomplished via the methodology of structural reconstruction, whose physicochemical property, channel connectivity as well as the location of Mg 2+ and I - ions were investigated systematically. It was found that Mg 2+ ions were located in the zeolitic framework and I - ions were mainly confined in Mg-Beta zeolite via the electrostatic interaction with tetraethylammonium cations. The establishment of structure–function relationship in CO 2 cycloaddition reaction with epoxides indicated the presence of synergistic effect between framework Mg 2+ ions and confined I - ions. The immobilisation of halide ions onto a zeolite support enabled it the recoverable ability from reaction systems, giving rise to relatively stable reusability. The catalytic transformation of CO 2 cycloaddition with epoxides in this work was devoted to ameliorate environmental stress from anthropogenic greenhouse gases of CO 2 by means of elaborately constructing metallosilicate zeolite confined non-metallic catalysts with dual functions.
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FUEL
·
2016
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IF 3.611
Yingchao Hu,Wenqiang Liu,Hongqiang Chen,Zijian Zhou,Wenyu Wang,Jian Sun,Xinwei Yang,Xian Li,Minghou Xu
A screening of inert solid supports as metal skeletons of CaO-based sorbents was conducted in this work, aiming to provide the basis and guideline for the selection of inert solid refractories to produce high temperature CO 2 capture sorbent. We studied 12 different refractories including Al-, Ti-, Mn-, Mg-, Y-, Si-, La-, Zr-, Ce-, Nd-, Pr- and Yb-based supports, among which Yb and Pr are newly introduced ones. The sorbents were synthesized using the same wet-mixing method, by which the inert supports could be well dispersed among the ultra-fine active specie of CaO/CaCO 3 particles to fully play the role of frameworks for sintering resistance. The sorbents stabilized by these inert supports were also cyclically tested under the same conditions. Y- and Al-based supports were found to exhibit much superior cyclic performance than the other supports. Mn-, Mg-, La-, Yb- and Nd-based supports are also good candidates, whereas the other ones containing Ti-, Ce-, Zr-, Si- and Pr-based supports show less effectiveness. The melting point of the inert support and surface area of the synthetic sorbents are found to be the key factors to affect the sorbent performance.
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Electronic Materials Letters
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2024
·Vol. 20
·期 4
·459-473
·
IF 2.1
Tang Jing,Xu Hui,Chen Yong,Zhu Yuanqiang
Currently, transition metal tungstates are emerging as electroactive materials for supercapacitors due to their excellent electrical conductivity and electrochemical properties. Small amounts of transition metal ions doping can affect the physical and electrical properties of transition metal tungstates. In this study, Co ion-doped NiWO 4 amorphous composites (CNWO) were synthesized using a simple and effective hydrothermal method and utilized as the cathode material for supercapacitors. The structure and electrochemical properties of NiWO 4 and CNWO composites were investigated using various testing techniques. Specifically, when the cobalt ion doping amount is 10%, the corresponding CNWO-10 electrode material exhibits a specific capacitance of 804 F g −1 at 1 A g −1 , and at a current density of 10 A g −1 , the capacitance retention rate reaches 66.7%, demonstrating good rate performance. Additionally, an asymmetric supercapacitor device was constructed using CNWO-10 and activated carbon (AC) as positive and negative materials, respectively. Which could cycle reversibly under a potential window of 2.1 V. The device demonstrates a maximum specific capacitance of 76.5 F g −1 at 0.5 A g −1 , and a high energy density of 47 Wh kg −1 at a power density of 527 W kg −1 . Furthermore, 96% capacitance cycling stability is maintained after 5500 cycles at a trapezoidal current density. Moreover, the electrical conductivities of NiWO 4 and CNWO-10 samples are 9.01 × 10 –8 S m −1 and 8.93 × 10 –6 S m −1 , attributed to the Co ion-doping that can reduce the gap width of the forbidden band to enhance conductivity. These results suggest that CNWO composites can serve as promising high-capacity electrode materials for high-performance supercapacitors in alkaline electrolytes. Graphical Abstract
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JOURNAL OF MOLECULAR LIQUIDS
·
2022
·
IF 6.633
Imran Khan Swati,Qazi Sohaib,Hayat Khan,Mohammad Younas,Afshin Hosseini Monjezi,Jianxin Li,Mashallah Rezakazemi
Post-combustion carbon-capturing (PCC) is one of the technologies that has been expanded in recent years, to control greenhouse gas emissions. This work aims to explore the potential applications of polymeric hydrophobic membranes and green ionic liquids (ILs). Experiments were conducted on lab-scale flat sheet (FS) membrane contactors (MCs) where CO 2 was captured from a continuous feed mixture (CO 2 + N 2 ) with a recirculated-based aqueous solution of IL at a constant temperature of 298 K and with no pressure driving force. The effects of contact angle, liquid entry pressure (LEP), initial CO 2 concentration, and type of solvents and membrane material on the CO 2 capture efficiency and membrane wetting in the PCC process have been experimentally investigated and evaluated. Polytetrafluoroethylene (PTFE) has shown the most hydrophobic property with 6–17 O loss in the contact angle. Furthermore, 1-Methyl-3-octyl-imidazolium-tetrafluoroborate ([OMIM][BF 4 ]) and 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM][BF 6 ]) have exhibited only 5–8 % loss in LEP using PTFE membrane support. The CO 2 capture efficiency has been achieved as 80.8–99.8 % in different combinations of ILs and membrane support keeping all other variables constant. While increasing CO 2 concentration from 15 to 45 % vol., an increase of nearly three folds in the CO 2 mass transfer flux was observed. Combination of [OMIM][BF 4 ] and PTFE membrane witnessed good long-term stability with only 20 % loss in CO 2 capture efficiency in 480 min of continuous operation.
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CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Liju Bai,Shijian Lu,Qizheng Zhao,Linlin Chen,Yingjie Jiang,Chunxiao Jia,Siming Chen
Non-aqueous biphasic solvents, which combine the advantages of a non-aqueous absorbent and biphasic absorbent, have attracted increasing attention for CO 2 capture because of their great potential to reduce the energy consumption. This study proposed a non-aqueous N -ethylethanolamine (EMEA)/ N , N -diethylethanolamine (DEEA)-based liquid–liquid biphasic absorbent with p -xylene (PX) to replace 45–65 % of DEEA. The biphasic absorbent comprising 30 wt% EMEA + 5 wt% DEEA + 65 wt% PX (30E5D65P) had the best phase-change behaviour. In this absorbent, 98.8 % of the absorbed CO 2 was in the lower phase of the solvent, with a volume percentage of 35.1 %. This absorbent also showed the best CO 2 -desorption performance, with almost double the CO 2 -desorption amount and maximum CO 2 -desorption rate compared with those achieved using the 30 wt% EMEA + 70 wt% DEEA (30E70D) non-aqueous absorbent. The regeneration energy of 30E5D65P was 1.71 GJ∙t −1 CO 2 , which was reduced by 31 % and 55 % compared with that of the non-aqueous 30E70D absorbent and the aqueous 30 wt% monoethanolamine absorbent, respectively. 13 C NMR analysis and quantum chemical calculations showed that carbamate and PX have a better separation effect than that of EMEA and DEEA, owing to the presence of both polarity and hydrogen bonding. PX with low polarity was beneficial for the separation of carbamate. The carbamate interacted with (protonated) EMEA, (protonated) DEEA and carbamic acid through hydrogen bonds, resulting in the appearance of these components in the lower phase. The carbamate had no hydrogen bond self-aggregation, which may be the reason why there was no crystal precipitation.
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危险品化学品经营许可证（带存储）