JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Sharafat Ali,Haider Ali,Syedul Hasnain Bakhtiar,Sajjad Ali,Muhammad Zahid,Ahmed Ismail,Pir Muhammad Ismail,Amir Zada,Imran Khan,Huahai Shen,Rizwan Ullah,Habib Khan,Mohamed Bououdina,Xiaoqiang Wu,Fazal Raziq,Liang Qiao
The construction of extremely dispersed redox-heterojunctions is a critical step toward improving of photocatalytic activity. Nonetheless, electron transfer faces momentous hurdles at the interfaces of these redox-heterojunction, mainly as a result of the considerable gap and potential-barrier between them. To address this obstacle, a bifunctional phosphate was deliberately introduced as an electron-bridge into the Cu 2 O/CeO 2 redox-heterojunction system, aiming to necessitate a potential-barrier, establish a photoelectron transport route to improve the surface catalysis, and serve as a catalyst stabilizer , leading to improved dispersion of Cu 2 O on the CeO 2 surface. The resultant intricately dispersed and optimized redox-heterojunction showcased an unparalleled advancement in apparent quantum efficiency (AQE), attaining an approximate value of 1.41 % at 420 nm during the photocatalytic CO 2 reduction. The experimental findings established a conspicuous association between the substantial increase in AQE and the diminished interfacial migration resistance, heightened dispersion, and abundance of more active-sites, all accredited to phosphate-modulation in the redox-heterojunction. The work emphasizes the significant importance of phosphate in bridging the conduction and valence bands of semiconductors, leading to enhanced photocarrier separation efficiency and improved molecular dispersion.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2023
·
IF 8.7
Xingyuan Wang,Jiamin Qi,Hengxi Zhu,Jiancheng Wang,Heping Zeng,Bin Li,Si Yan
The aluminum industry is facing severe economic and environmental problems due to increasing carbon emissions and growing stockpiles of red mud (RM). RM is a strongly alkaline, high-emission solid waste from the alumina industry with potential for CO 2 sequestration. However, the effectiveness of RM carbon sequestration is poor, and the mechanism behind it is not well understood. In this study, the effect of microwave and tube furnace activation of RM on CO 2 sequestration in alumina was first investigated at different temperatures. The result showed that the CO 2 sequestration capacity of unmodified RM (URM) was only 14.35 mg/g at ambient temperature and pressure, and the CO 2 sequestration capacity could be increased to 52.89 mg/g after high-temperature activation and modification. Besides, high-temperature activation and modification will effectively improve the carbon sequestration capacity of RM. The carbonized RM was characterized by FT-IR, SEM, XRD , laser particle size, TG-DSC, and pH measurements. In addition, the mechanism of RM capturing CO 2 was also proposed, which shows that CO 2 was finally sequestered in the RM as CaCO 3 . The change in particle size distribution and the mineral phase in the RM indicated that high-temperature activation modification positively affects the application of RM to the sequestration of CO 2 . This study can provide a promising technology for the low-carbon and green development of the aluminum industry, as well as achieving the waste treatment and utilization objective.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yi Liu,Shuangjiang Li,Ying Chen,Mengrui Li,Zewen Chen,Tianding Hu,Lan Shi,Manoj Pudukudy,Shaoyun Shan,Yunfei Zhi
The development of highly efficient and metal- and halogen-free heterogeneous catalysts for the chemical conversion of CO 2 to cyclic carbonates plays a critical role in the reduction of greenhouse gas emissions. Herein, two melamine-based organic polymers namely UM-OP and AM-OP with abundant N sites and –NH- groups were synthesized by a facile method and their activity for cycloaddition of CO 2 with epoxides was investigated. The structural analysis shows that the UM-OP and AM-OP catalysts were composed of specially designed urea and amide group linkages, respectively. UM-OP and AM-OP are metal-free, halogen-free, and can efficiently catalyze CO 2 cycloaddition under solvent-free and cocatalyst-free conditions. Moreover, the UM-OP catalyst exhibited higher catalytic activity than AM-OP, good structural stability, recyclability, separability from the products, and shown high activity to a series of epoxides. The density functional theory (DFT) calculations revealed the activation of epoxides by –NH- groups and CO 2 by N sites in the samples, respectively, and N sites can also act as nucleophiles to realize ring opening of epoxides. Combining the results of experiments and calculations, it was further found that the double –NH- (urea group) is more efficient than single –NH- (amide group) to activate the epoxides. This paper reveals the mechanism of N sites and –NH- groups synergistically catalyzing the CO 2 cycloaddition, and further supports the theory that N atoms acts as nucleophile for ring opening, providing a reference for the design of metal- and halogen-free heterogeneous catalysts.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Zhipeng Liu,Chang Liu,Jiawei Zhang,Suhua Mao,Xiao Liang,Hanlin Hu,Xiaoxi Huang
Layered materials have been investigated in many different catalytic reactions due to their excellent functionalities. In particular, understanding the anisotropic properties of layered materials is important for the design of more efficient catalysts. Herein, SnS 2 nanoflakes with abundant edge sites (E-SnS 2 ) were synthesized and their catalytic properties towards the electrochemical CO 2 reduction reaction (CO 2 RR) were studied. Combining experimental data and computational analysis, we found that the edge sites of SnS 2 are more active for CO 2 to formate conversion compared with the basal sites. Moreover, a CO 2 reduction intermediates triggered activation mechanism at the edge sites is proposed, the formation of sulfur vacancies at the edges would generate more active sites for CO 2 RR. The as-synthesized E-SnS 2 shows high selectivity, activity and robust stability for at least 12 h in a flow cell under a current density of − 200 mA·cm -2 . This work may provide a new perspective on rational catalyst design for CO 2 RR.
✓ 已验证
产品关联
DOI
高影响因子
ENERGY
·
2023
·
IF 9
Run Qi,Zhaohao Li,Hongyuan Zhang,Hongming Fu,Heng Zhang,Dan Gao,Haiping Chen
Membrane absorption is a promising CO 2 capture technology, which is limited by the high cost of membrane materials. Coal fly ash (CFA)-based ceramic membrane as an alternative material for membrane modules can effectively reduce the preparation cost. In this study, CFA-based ceramic membrane with superhydrophobic properties is prepared by depositing SiO 2 nanoparticles and grafting 1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane (POTS). Characters including pore size distribution, porosity and N 2 flux of superhydrophobic membrane are performed. The superhydrophobic modified ceramic membrane is applied to CO 2 capture experiments using ethanolamine (MEA) solution as the absorbent. The result shows that the contact angle of the modified ceramic membrane reaches 155.0°, which significantly improves the anti-wetting properties of the membrane surface . The CO 2 capture experiment demonstrates a maximum capture efficiency of 97.45% and a mass transfer rate of 21.17 mol/(m 2 ·h). In addition, the superhydrophobic modified ceramic membrane exhibits excellent thermal and chemical stability, sustaining high performance even after 8 h of continuous operation. This study provides the theoretical and empirical foundation for the application of CFA-based superhydrophobic ceramic membranes in CO 2 capture.
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2023
·Vol. 15
·期 19
·3886
·
IF 5
Xin Chen,Yiqiang Li,Xiaoguang Sun,Zheyu Liu,Jianbin Liu,Shun Liu
CO2flooding is a favorable technical means for the efficient development of low-permeability reservoirs, and it can also contribute to the realization of net-zero CO2emissions. However, due to the unfavorable viscosity ratio and gravity overriding effect, CO2channeling will inevitably occur, seriously affecting its storage and displacement effects. This paper conducts a systematic study on the application of polymer-assisted CO2flooding in low-permeability reservoirs. Firstly, the polymer agent suitable for low-permeability reservoirs is optimized through the viscosity-increasing, rheological, and temperature- and salt-resistant properties of the solution. Then, the injectivity performance, resistance-increasing ability, and profile-improving effect of the polymer solution were evaluated through core experiments, and the optimum concentration was optimized. Finally, the enhanced oil recovery (EOR) effects of polymer-assisted and water-assisted CO2flooding were compared. The results show that the temperature-resistant polymer surfactant (TRPS) has a certain viscosity-increasing performance, good temperature resistance performance, and can react with CO2to increase the solution viscosity significantly. Meanwhile, TRPS has good injection performance and resistance-increasing effect. The resistance increasing factor (ηandη′) of TRPS-assisted CO2flooding increases with increased permeability, the concentration of TRPS solution, and injection rounds. Consideringη′ and the profile improvement effect comprehensively, the application concentration of TRPS should be 1000 mg/L. The EOR effect of TRPS-assisted CO2flooding is 8.21% higher than that of water-assisted CO2flooding. The main effective period is in the first and second rounds, and the best injection round is three. The research content of this paper can provide data support for the field application of polymer-assisted CO2flooding in low-permeability reservoirs.
✓ 已验证
DOI
PubMed
高影响因子
FUEL
·
2023
·
IF 7.4
Peng Li,Senlin Zhang,Zhourong Xiao,Hui Zhang,Fei Ye,Jianmin Gu,Jidong Wang,Guozhu Li,Desong Wang
Catalytic reduction of CO 2 to high value-added chemicals such as methane is crucial in the development of renewable energy and waste disposal. Photo-thermal CO 2 methanation has been received great attention, because the synergistic effect of photo and thermal lead to efficient CO 2 reduction at low temperature. Herein, we reported the synthesis of Ni nanoparticles (NPs) supported on TiO 2 (Ni-TiO 2 ) derived from MIL-125 (Ti-MOFs) for photo-thermal CO 2 methanation. The nanoparticle sizes and electron densities of metallic Ni, defects and chemical properties, photo-thermal and photo-electric characteristics of the catalysts have been systematically characterized by XRD, TEM, CO 2 /H 2 -TPD, XPS, photoluminescence and photocurrent. For the Ni-TiO 2 , the conversion of CO 2 was 56 % under the full spectrum irradiation (1200 mW/cm 2 ) at 325 °C, which was about 1.8 times of that without light irradiation. The selectivity of methane nearly 99 % with a production rate was 95.7 mmol/(g cat ∙h), which was about 2.7 times of that without light irradiation. Meanwhile, the catalysts showed excellent stability without any activity decay during the four cycles testing (32 h). The main reasons for the high catalytic performance for photo-thermal CO 2 methanation were attributed to the uniform distribution of Ni NPs with synergistic effect of large specific surface area of TiO 2 with abundant moderate strength alkaline sites. In addition, good photo-thermal and photo-electric conversion ability make the catalysts possess more photo-generated charge carriers and reduce its recombination.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Xiaochen Xiang,Jiao Wang,Qinglong Ru,Sumin Li,Ke Zhao,Yifei Zhu,Zhenpan Chen,Liangliang Liu,Guangqin Gu,Yu Jia,Bao Zhang,Gang Cheng,Zuliang Du
As the single electron transfer of CO 2 to CO 2 − ions is the critical step in the CO 2 activation, it is very important to develop appropriate strategies to construct efficient catalytic systems. Herein, we constructed a coupled catalytic system consisting of mechanical-energy-driven triboelectric plasma and indium oxide rich in oxygen vacancies to achieve CO 2 reduction to CO at room temperature and atmospheric pressure. At the discharge distance of 0.6 mm, the indium oxide with more oxygen vacancies exhibited an optimal catalytic activity of 0.20 mmol·g −1 ·h −1 for CO evolution rate, and the conversion efficiency from electrical to chemical energy was 10.8 %. Electron paramagnetic resonance experiments showed that a large amount of CO 2 − ions were generated in the triboelectric plasma. The introduction of oxygen vacancies could increase the density of states near the Fermi level of indium oxide catalysts, stabilize highly active CO 2 − ions, and reduce the energy barrier of CO 2 − decomposition.
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Zhihong Xu,Yunxi Han,Jiuyi Sun,Meng Xu,Wenli Zhao,Qingfa Wang
Electrochemical CO 2 reduction (ECR) to C 2+ products is an efficient method to accomplish intermittent energy storage and CO 2 utilization. Developing high-selectivity electrocatalysts for C 2+ products, especially C 2+ alcohols, have attracted more attention but still remains a major challenge. Here, three kinds of short nanotube (<100 nm), long nanotube (>100 nm), and long nanotube-assembled hollow sphere CuSiO 3 catalysts with different confined space are fabricated for boosting the ECR to produce C 2+ products selectivity. Long CuSiO 3 nanotubes exhibit a higher yield of C 2+ alcohols (26.8 %) and more satisfactory Faraday efficiency (FE) of 69.5 % for C 2+ products than short nanotubes and nanotube-assembled hollow spheres. The confinement effect of long CuSiO 3 nanotubes is conducive to promoting the dimerization of the key reaction intermediate (*CO), inhibiting the diffusion of protons and the side-reaction hydrogen evolution reaction (HER). The formed Cu 0 /Cu + interfaces in CuSiO 3 nanotubes promote the dimerization reactions of adsorbed *CO. The synergistic effect of nanotubes confinement and Cu 0 /Cu + interfaces facilitate the C C coupling reaction to C 2+ products via ECR.
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
·
2023
·
IF 5.3
Jinrui Zhang,Xiaoqiong Wang,Shixun Chen,Haorui Liu,Shuixia Chen
The adsorption capacity of a solid amine adsorbent for CO2 adsorption is often limited by the number of amino groups on the adsorbent surface. In this paper, a kind of ultrafine solid amine fiber (PSN) was prepared by direct electrospinning of polyethylenimine blends, which could provide plentiful amino groups on the fiber surface without further modification and would improve the CO2 adsorption capacity and amino utilization efficiency of the fibrous adsorbent. The effects of the adsorbent structure on the CO2 adsorption performance of PSN was investigated. The results indicated that the fibrous structure and higher outer surface area of PSN can greatly improve its adsorption capacity and adsorption rate for CO2. Under the simulated flue gas conditions (90% N2/10% CO2) at 25 °C, the CO2 adsorption capacity of PSN fiber is 2.10 mmol/g, and its CO2 adsorption capacity could reach 4.98 mmol/g at 75 °C. The diameter of the fiber obviously affects the CO2 adsorption behavior of the solid amine adsorbents; an increase of the fiber diameter would result in the decrease of the adsorption capacity of the adsorbents. PSN has good regeneration stability, and its CO2 adsorption performance remained almost unchanged after a number of regeneration cycles.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2023
·
IF 3.8
Dongxue Xiang,Feng Niu,Jing Ji,Junhui Liang,Huayu Chen,Laishun Qin,Yuexiang Huang,Da Chen
Lead halide perovskites (LHPs) quantum dots (QDs) has been deemed as a promising material for photocatalytic conversion (e.g., CO 2 reduction or water splitting) due to their remarkable photoelectrical properties. However, the severe carrier recombination and low charge transfer efficiency largely restrain their photocatalytic performance. Herein, a series of graphene supported dual-phase perovskite QDs photocatalysts were designed by a facile hot-injection strategy for highly efficient photocatalytic CO 2 reduction. Catalytic results showed that under a 5 W white LED irradiation, the CsPbBr 3 /Cs 4 PbBr 6 @G 5% composite with 5 wt% graphene loading exhibited an optimum CO yield of 18.76 μmol g −1 with a selectivity of 52.99% towards the product of CO for photocatalytic CO 2 reduction. The enhanced photocatalytic CO 2 reduction performance over the composites compared with that of CsPbBr 3 , Cs 4 PbBr 6 and CsPbBr 3 /Cs 4 PbBr 6 QDs could be ascribed to the type-I heterojunction structure and graphene support as the electron acceptor in the composite, which could stepwise accelerate the charge separation, suppresses recombination process, and provide more active sites for CO 2 adsorption and reaction. This work would bring new insight in designing novel efficient perovskite-based catalysts for photocatalytic CO 2 transformation.
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2017
·
IF 2.843
Junjie Zhu,Linbo Wu,Zhiyang Bu,Suyun Jie,Bo-Geng Li
Porous cross-linked polymers containing pendant triazole groups were synthesized from glycidyl methacrylate (GMA) in the presence of divinylbenzene via high internal phase emulsion (HIPE) templating method followed by functionalization with sodium 3-amino-1,2,4-triazole (ATANa). They were characterized with FTIR, SEM, BET, and mercury intrusion and assessed as CO2 adsorbents. With interconnected hierarchical porous structure and abundant triazole groups which absorbed CO2 chemically in 1:1 stoichiometry, the adsorbents exhibited high CO2 adsorption capacity (3.6 mmol g–1, at 25 °C and 1 atm) and rate, and good CO2/N2 selectivity (∼30). The adsorbents also displayed easy CO2 desorption with medium desorption heat (58 kJ/mol CO2), acceptable moisture endurance, and excellent recyclability. The results suggest that these functionalized porous polymers are potential adsorbents for CO2 capture.
✓ 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）