Article
Energy & Fuels
Jose Juan Segovia, Alejandro Moreau, Xavier Paredes, Teresa E. E. Fernandez-Vicente, David Vega-Maza, Maria Carmen Martin
Summary: The study presents measurements of the speed of sound of biogas mixtures from a biomethanation plant in Madrid. The experimental results were fitted using a virial-type equation and compared with reference equations for natural gas mixtures, showing good agreement. The findings highlight the reliability of these equations in predicting the thermodynamic behavior of biogas.
Article
Engineering, Environmental
L. Cano-Casanova, A. Amoros-Perez, M. Ouzzine, M. C. Roman-Martinez, M. A. Lillo-Rodenas
Summary: TiO2-C photocatalysts were prepared by hydrothermal synthesis using titanium tetraisopropoxide, saccharose and HCl of variable concentration. The TiO2-C photocatalysts have textural properties similar to those of analogous bare TiO2 samples, but different crystalline phase composition; they only contain anatase instead of an anatase-brookite-rutile mixture in bare TiO2. This reveals that carbon contributes to the stabilization of anatase. Also, the presence of carbon has shown to favor the spherical morphology. The TiO2-C photocatalysts are more active than analogous bare TiO2 ones and P-25. The most efficient TiO2-C photocatalysts are those prepared with lower HCl concentration solutions, 0.5 and 0.8 M, which present higher surface area and lower density of hydroxyl surface groups. Carbon, about 0.3-0.7 wt%, seems to be (partially) incorporated into the TiO2 lattice and it likely leads to low electron-hole recombination rate and to emission processes that could contribute to explain the good activity of the TiO2-C samples.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Polymer Science
Jennifer L. Jordan, Rick L. Rowland, John Greenhall, Eric K. Moss, Rachel C. Huber, E. Cade Willis, Rostislav Hrubiak, Curtis Kenney-Benson, Brian Bartram, Blake T. Sturtevant
Summary: Polyethylene, a widely used plastic, shows varied properties depending on factors like molecular weight and crystallinity. This study experimentally determined the sound speeds and elastic properties of different polyethylene materials, finding that they increase with pressure. The zero pressure orthorhombic phase was observed to transform to monoclinic at low pressures of about 0.1 GPa.
Article
Chemistry, Multidisciplinary
Victoria S. Pfennig, Romina C. Villella, Julia Nikodemus, Carsten Bolm
Summary: A one-pot, three-step protocol for the preparation of Grignard reagents from organobromides in a ball mill has been reported, followed by their reactions with CO2 or sodium methyl carbonate to provide aryl and alkyl carboxylic acids with yields up to 82%. The method stands out for its short reaction times and significantly reduced solvent amounts, with methoxy-substituted aryl bromides unexpectedly leading to major products being symmetric ketones.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Physical
Tongqi Ye, James H. Carter, Bao Chen, Xin Li, Yuewen Ye, Stuart H. Taylor, Graham J. Hutchings
Summary: The oxidative dehydrogenation of propane to propene using carbon dioxide is a promising new synthesis route. Iron-chromia catalysts prepared by sol-gel exhibited high activity and a high concentration of acid and base sites. Despite some coking observed, the initial activity can be restored through oxidative regeneration.
CATALYSIS COMMUNICATIONS
(2022)
Article
Thermodynamics
Hongyu Chen, Kai Zhang, Zhen Yang, Yuanyuan Duan
Summary: The experiment measured the speed of sound in 3,3,3-trifluoropropene in the gaseous phase at different temperature and pressure conditions, obtaining accurate data and studying the ideal-gas heat capacity and second acoustic virial coefficient.
JOURNAL OF CHEMICAL AND ENGINEERING DATA
(2021)
Article
Chemistry, Multidisciplinary
Mingxin Xu, Jizhen Wang, William S. S. Harley, Peter V. S. Lee, David J. J. Collins
Summary: Acoustic holography enables the generation of designed acoustic fields for manipulating microscale objects. However, the limitations of static 3D printed acoustic holographic phase plates or large aperture sizes prevent rapid alteration of the generated fields. In this study, a programmable acoustic holography approach is demonstrated, allowing for the creation of multiple discrete or continuously variable acoustic targets. By modifying the sound speed of an intervening fluid media, the desired acoustic fields can be produced. This approach has the advantages of flexibility in generating various acoustic patterns and has broad potential in areas such as microfluidics, cell/tissue engineering, real-time sensing, and medical ultrasound.
Article
Energy & Fuels
Arefeh Naghizadeh, Aydin Larestani, Menad Nait Amar, Abdolhossein Hemmati-Sarapardeh
Summary: Acquiring accurate knowledge about the viscosity of carbon dioxide, nitrogen, and their mixtures is crucial for various industries. The study developed models using different techniques to predict viscosity, with the BRT-ABC model showing the highest accuracy and reliability, while GP technique provided easy-to-use correlations based on gas composition, temperature, and pressure.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Green & Sustainable Science & Technology
Weiming Song, Jianan Zhou, Yujie Li, Shu Li, Jian Yang
Summary: This study proposes a novel approach of injecting waste tire powder into the converter vaporization cooling flue (CVCF) for CO2 gasification to generate gaseous fuels using waste heat. The gasification behavior and activation energy were investigated, showing an increase in combustible gas production with higher temperatures and smaller particle size.
Article
Environmental Sciences
Qin Wang, Farhan Mustafa, Lingbing Bu, Juxin Yang, Chuncan Fan, Jiqiao Liu, Weibiao Chen
Summary: This study conducted airborne measurements and comparisons of atmospheric CO2 concentration in Dunhuang, western China, using different instruments and models. The results showed consistency between airborne observations, satellite retrievals, and model estimates. The study also revealed a strong positive correlation between atmospheric CO2 and aerosol optical depth.
Article
Chemistry, Physical
Jae Young Kim, Duck Hyun Youn
Summary: This study demonstrates the feasibility of electrochemical reduction of gaseous CO2 at low-intermediate temperatures using a solid acid membrane cell, and introduces a Cu-based catalyst that can produce hydrocarbons and liquid fuels. This system offers a new possibility for addressing the challenges of producing hydrocarbons and liquid fuels from CO2 reduction.
Article
Chemistry, Physical
Douglas A. Barlow, Fenner E. Colson
Summary: In this letter, the authors predict the structure of carbon dioxide gas in a carbon nanotube using an analytical approach. They confirm that an outer gaseous layer will be stable from an energetic perspective.
CHEMICAL PHYSICS LETTERS
(2022)
Article
Chemistry, Physical
Xuan Liu, Mariana C. O. Monteiro, Marc T. M. Koper
Summary: Insights into the mechanism and kinetics of the electrochemical CO2 reduction reaction are limited by the lack of information on interfacial pH. This study combines a reliable pH sensor with the rotating ring-disk electrode technique to investigate the relationship between interfacial pH and CO2 reduction reactions. The results show that interfacial pH increases with increasing current density, and there is a sharp increase at around -0.5 V vs. RHE, indicating a change in buffering species. pH measurements under different conditions further reveal the influence of electrolyte effects on interfacial pH.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Editorial Material
Chemistry, Multidisciplinary
Francis Millward, Eli Zysman-Colman
Summary: A fundamental goal of synthetic chemistry is to transform lower value molecular feedstocks into more complex substances of greater value. Anthropogenic waste gases, being underappreciated and sustainable reagents, can undergo diverse reactions by harnessing the powerful activating ability of photocatalysis.
TRENDS IN CHEMISTRY
(2023)
Article
Engineering, Chemical
Zhen Li, Zhaozong Meng, Arthur Haigh, Ping Wang, Andrew Gibson
Summary: The low-cost microwave cavity resonator sensor is developed for the assessment of honey, and it has been shown that the resonance frequency decreases with increasing added water content in honey-water mixtures, accurately determining water content and indicating adulteration.
JOURNAL OF FOOD ENGINEERING
(2021)
Article
Thermodynamics
Shuzhou Peng, Shuhao Li, Zhen Yang, Yuanyuan Duan
Summary: R1234yf and R1243zf have received attention as environmentally friendly refrigerants, but their pure form is limited due to flammability and low refrigerating capacity. Mixed refrigerants show promising potential in terms of thermophysical performance, safety, and environmental protection.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2022)
Article
Chemistry, Physical
Xinghui Wu, Zhen Yang, Yuanyuan Duan
Summary: In this study, the bubble formation and growth process on an ideal smooth heating surface were investigated using molecular dynamics simulation. It was found that the addition of R1234yf can inhibit bubble nucleation and growth. A semi-theoretical model for predicting surface bubble growth rate was proposed based on the prediction model of bubble growth rate in the liquid phase.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Chemistry, Physical
Shuhang Lyu, Zhen Yang, Yuanyuan Duan
Summary: In this study, the dissipative force and sliding mode of moving nanodroplets on hydrophobic surfaces were investigated using molecular dynamics simulation. The results showed that the dissipative force had a significant effect on nanodroplets and they exhibited a combination of rolling and slipping motion on the surfaces. The effects of striped structure on the dissipative force and sliding mode were also studied.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Review
Energy & Fuels
Jian Li, Xiayao Peng, Zhen Yang, Shuozhuo Hu, Yuanyuan Duan
Summary: This paper provides a systematic review of the research status of dual-pressure evaporation ORC, including system arrangements, process characteristics, component layouts, and suitable scenarios. It also summarizes the improvement approaches for cycle structure and potential application fields, and analyzes the off-design operation characteristics.
Article
Thermodynamics
Ran Li, Zhen Yang, Yuanyuan Duan
Summary: This study investigates the off-design performance of geothermal organic Rankine cycles (ORC) under different load curves and pressures. The results show that the optimal load ratio is 60% and that increasing the design pressure can improve the peak efficiency.
INTERNATIONAL JOURNAL OF GREEN ENERGY
(2023)
Article
Thermodynamics
Jian Li, Zhen Yang, Zitao Yu, Jun Shen, Yuanyuan Duan
Summary: Geothermal power generation has excellent application prospects due to its good continuity, little weather influence, and abundant resource reserves. This study evaluates the quantitative impacts of climatic environment on system performance using organic Rankine cycle (ORC) as the power generation system. The results reveal that the cooling mode is the key factor determining the geothermal power generation potential.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Thermodynamics
Shuhao Li, Shuzhou Peng, Zhen Yang, Yuanyuan Duan
Summary: The verification experiments of vapor-liquid equilibrium for the CO2 + R-1234yf and CO2 + R-1243zf mixtures were conducted, and the results were in good agreement with the literature data, demonstrating the reliability of the measurement apparatus and method. The PRSV + WS + NRTL model was used to correlate the VLE data.
FLUID PHASE EQUILIBRIA
(2022)
Article
Chemistry, Physical
Xiaofei Li, Xue Sun, Qiang Song, Zhen Yang, Haiming Wang, Yuanyuan Duan
Summary: The development of clean hydrogen production methods is crucial for large-scale applications, and the solar thermochemical water-splitting cycle shows promise in this regard. This review summarizes the state-of-the-art technologies and possible integration schemes for concentrated solar thermal, thermal storage, and thermochemical water-splitting cycles. Key issues and performance indicators are also discussed.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Thermodynamics
Xiayao Peng, Liu Xu, Zhen Yang, Yuanyuan Duan
Summary: In this study, the speed of sound in the gaseous phase of R1234ze(Z) and R1216 was measured. The results showed that R1234ze(Z) and R1216 have good performance in high-temperature heat pumps and organic Rankine cycle systems, which is essential for designing system components and deriving other thermodynamic properties.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2023)
Article
Thermodynamics
Jingwen Li, Zhen Yang, Yuanyuan Duan
Summary: This study investigates the single-bubble growth characteristics of R32, R1234yf, and their binary mixtures using pool boiling experiments. The results show that the bubble growth characteristics of mixtures differ from those of pure components, providing important guidance for the selection and application of refrigerants.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Jian Li, Zhen Yang, Jun Shen, Yuanyuan Duan
Summary: This paper quantitatively evaluates the enhancement effects of adding internal heat exchanger (IHE) in the typical series dual-pressure evaporation organic Rankine cycle (SDORC). The study reveals that adding IHE can effectively enhance the thermo-economic and thermodynamic performance of SDORC under certain conditions, reducing specific investment cost and increasing net power growth.
Article
Thermodynamics
Shuzhou Peng, Erqi Wang, Shuhao Li, Zhen Yang, Yuanyuan Duan
Summary: The vapor-liquid equilibrium (VLE) properties of R1234yf + R32 + R125 and R1234yf + R32 + CO2 ternary mixtures were measured in this study, and the PR + WS + NRTL model was used to correlate the VLE data. The results showed that both ternary mixtures were zeotropic.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2023)
Article
Thermodynamics
Chenxu Ni, Xingjian Wang, Hangtao Liu, Kai Zhang, Xiaopeng Zheng, Yuanyuan Duan
Summary: This study proposes different deep feedforward neural network (DFNN) models for property evaluations of carbon dioxide. The all-in-one DFNN model performs well in enthalpy, entropy, and thermal conductivity, but not in density, speed of sound, viscosity, and constant-pressure specific heat. To solve this problem, the gradient-harmonizing method is proposed by dividing the sampling data into easy and hard samples, rectifying their gradient contribution, and assigning different weights. The resultant models show significantly improved performance with less than 0.4% average relative errors for the properties studied.
JOURNAL OF THERMOPHYSICS AND HEAT TRANSFER
(2023)
Article
Thermodynamics
Ran Li, Zhen Yang, Yuanyuan Duan
Summary: In this study, calculation methods for modeling, prediction, and optimization of the integrated gasification combined cycle (IGCC) with carbon capture and storage (CCS) system were established. The carbon capture rate (CCR) and levelized cost of energy (LCOE) were selected as the optimization objectives, and the effects of carbon trading were evaluated. The results revealed that the H2O/CO variable played a decisive role in the optimization target, and an increase in CCR led to a higher initial investment cost. Moreover, an increase in carbon trading prices significantly increased the system's maximum CCR.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Shuzhou Peng, Erqi Wang, Kang Qing, Zhen Yang, Yuanyuan Duan
Summary: The gaseous pvTx properties of pure R1234yf, binary mixtures of R32 + R1234yf and CO2 + R1234yf, and a ternary mixture of CO2 + R32 + R1234yf were measured using the Burnett apparatus. The uncertainties of temperature, pressure, and mole fraction were determined. The mass density was calculated and compared with existing models, resulting in low root mean square errors for the binary and ternary mixtures.
JOURNAL OF CHEMICAL AND ENGINEERING DATA
(2023)
