Article
Chemistry, Organic
Jun-Bin Shi, Qingqing Bu, Bin-Yuan Liu, Bin Dai, Ning Liu
Summary: An organocatalytic strategy has been developed for the direct carboxylation of terminal alkynes with CO2, resulting in the preparation of propiolic acid derivatives in high yields with broad substrate scope under mild conditions. This method offers a competitive alternative to metal catalysis for the carboxylation of terminal alkynes and CO2, and is also suitable for the three-component carboxylation reaction.
JOURNAL OF ORGANIC CHEMISTRY
(2021)
Review
Chemistry, Multidisciplinary
Xiaosheng Zhang, Caoer Jia, Jinyu Zhang, Linlin Zhang, Xuying Liu
Summary: This article summarizes the working principles of smart responses, self-charging, electrochromic, and battery integration in zinc ion batteries (ZIBs), and prospects emerging strategies to address current challenges and the development of smart ZIB systems.
Article
Thermodynamics
Andrew Lock, Viv Bone
Summary: This study investigates the off-design performance of the supercritical CO2 recompression cycle and presents effective operating strategies to enhance its performance and flexibility.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Thermodynamics
Yue Cao, Jun Zhan, Boqing Jia, Ranjing Chen, Fengqi Si
Summary: This study has investigated a supercritical/transcritical carbon dioxide (CO2) hybrid waste heat recovery system with different operation strategies under part-load conditions of gas turbine exhaust. The results indicate that the mass flow rate has a greater effect on the net power of the system compared to the turbine inlet pressure and these two variables should be controlled cooperatively. Increasing the inlet valve opening of the supercritical CO2 turbine can enhance the net power of the system under a specific gas turbine load.
Article
Thermodynamics
Ning Ma, Zhengkun Bu, Yanan Fu, Wenpeng Hong, Haoran Li, Xiaojuan Niu
Summary: Adding propane to CO2 can improve the thermal efficiency of the supercritical Brayton cycle and prolong the utilization time of solar energy in direct-heated solar power tower plants. This paper analyzes the potential of adding propane to CO2 and proposes an operation strategy for optimal scheduling of solar, molten salt, and fossil fuel energy supply. The results show that CO2-propane system outperforms the initial cycle in off-design conditions, with increased thermal efficiency and prolonged solar energy utilization time.
Article
Chemistry, Multidisciplinary
Mateusz Zajac, Tomislav Rozic, Ivona Bajor
Summary: This paper discusses the issue of unproductivity during the implementation of operations in inland container terminals. The authors hypothesize that the two main factors influencing the number of unproductive manipulations are the adopted operating strategy and the occupancy level of the storage yard. The presented model classifies the operation time and the waiting time for container handling separately, and also compares the impact of the terminal storage occupancy and selected strategies on the handling time. Based on the collected data, the impact of the number of occupied storage places and the frequency of repetition of operations on the average time of handling a freight unit are simulated. It is noticed that increasing the occupancy of the terminal area above 35% results in a significant increase in the frequency of repetition of operations. In the case of terminal area occupancy of about 50%, the average waiting time for service and the service of a freight unit itself may vary significantly, depending on the adopted strategies for the implementation of operations.
APPLIED SCIENCES-BASEL
(2023)
Article
Energy & Fuels
Yanfeng Liu, Yaxing Wang, Xi Luo
Summary: The study focuses on the development of dynamic operation strategies for a distributed solar energy system in remote Northwest China to optimize its design and operation. The dynamic operation strategies show potential in reducing operating costs and battery capacity optimization in grid-connected scenarios. In off-grid scenarios, the dynamic operation strategy outperforms fixed parameter strategies in terms of reducing abandoned photovoltaic power.
Review
Engineering, Chemical
Dina Ewis, Muhammad Arsalan, Mazen Khaled, Deepak Pant, Muneer M. Ba-Abbad, Abdulkarem Amhamed, Muftah H. El-Naas
Summary: CO2 electrochemical reduction is a promising technology to mitigate the effects of high CO2 content in the atmosphere by converting CO2 into value-added chemicals such as methanol, ethanol, and formic acid.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Thermodynamics
Yadong Du, Ce Yang, Zhiyi Yu, Wenrui Bao, Chenxing Hu, Xinyu He
Summary: This study investigates the integrated design and off-design control strategies of the supercritical CO2 recompression cycle in a small-scale lead-cooled fast reactor. The results provide theoretical guidance for the selection of off-design control strategies for the supercritical CO2 recompression cycles applied in various energy fields.
APPLIED THERMAL ENGINEERING
(2022)
Article
Green & Sustainable Science & Technology
Xinning Song, Shunhan Jia, Liang Xu, Jiaqi Feng, Lei He, Xiaofu Sun, Buxing Han
Summary: This article reviews the recent advances in coupling strategies in CO2 electrochemical transformation (CO2ET), from co-electrodes, counter electrodes to carbon capture, utilization and storage (CCUS) processes. The review summarizes coupling designs in electro-organic conversion of CO2 and the coupling of CO2ET with paired anodic oxidation reactions. Furthermore, existing applications of coupling strategies in CO2ET processes are summarized, along with the challenges encountered and future developments envisioned.
MATERIALS TODAY SUSTAINABILITY
(2022)
Review
Thermodynamics
Jingze Yang, Zhen Yang, Yuanyuan Duan
Summary: This paper provides a review on the integrated design and off-design operation of the solar power tower (SPT) system with supercritical CO2 (S-CO2) Brayton cycle. It summarizes the performance criteria, subsystem selections, and key parameter optimizations for system integrated design. Furthermore, it introduces an improved system design method based on off-design operating performance and discusses the fluctuating factors, parameter control strategies, and actual operation results for system off-design operation.
Article
Chemistry, Physical
Jungwoog Kim, Hyunjun Park, Wongwan Jung, Daejun Chang
Summary: This paper introduces an operation scenario-based design methodology to determine the design pressure of liquid hydrogen import terminals, with a case study showing that the vapor pressure of imported LH2 is the most influential factor.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Thermodynamics
Yadong Du, Ce Yang, Haimei Wang, Chenxing Hu
Summary: This study verified the accuracy of a one-dimensional design and analysis model against experimental data, highlighting the importance of optimizing the centrifugal compressor in the supercritical carbon dioxide Brayton cycle. It was found that the system's off-design efficiency is influenced by climate change, and strategies such as increasing compressor inlet pressure and raising speed can improve system performance.
APPLIED THERMAL ENGINEERING
(2021)
Review
Chemistry, Multidisciplinary
[Anonymous]
Summary: Microbial electrosynthesis cells (MES) have the capability to treat CO2-containing gaseous streams and generate valuable chemical products such as methane gas, carboxylic acids, and alcohols. This paper reviews and analyzes the important features of MES, providing practical recommendations for design, operation, and biocatalysts to enhance performance. The findings contribute to the successful implementation and further promotion of this CO2-refinery process.
JOURNAL OF CO2 UTILIZATION
(2023)
Article
Chemistry, Multidisciplinary
Kshirodra Kumar Patra, Chinnakonda S. Gopinath
Summary: This study discusses the impact of catalyst material, electrolyte, and gas diffusion electrode on the CO2RR in a gas-fed flow cell. It emphasizes the need for promising catalysts with a partial current density of >= 100 mA cm(-2) and high faradaic efficiency for scale-up requirements. The study also lists additional experimental hurdles and their potential solutions, as well as the best available protocols for data acquisition for catalyst activity evaluation.
CHEMICAL COMMUNICATIONS
(2023)
Article
Chemistry, Applied
Feraih Alenazey, Bandar AlOtaibi, Raja A. L. Otaibi, Yousef Alyousef, Salma Alqahtania, Amjad Qazaq, Umer Zahid, Dai-Viet N. Vo, Adesoji Adesina
Summary: The study evaluated a perovskite catalyst for methane dry reforming and found that it exhibited superior performance and good stability in a carbon-rich environment. This was attributed to electronic interactions between components in the multicomponent oxide catalyst prepared by sol-gel synthesis.
TOPICS IN CATALYSIS
(2021)
Article
Thermodynamics
Ju-Eon Bae, Supaporn Wilailak, Jae-Hyeon Yang, Dong-Yeol Yun, Umer Zahid, Chul-Jin Lee
Summary: This study focuses on the energy density of liquid hydrogen and CO2 emissions in the production process. Through optimization and cost analysis, the optimal performance that balances cost and CO2 emissions in liquid hydrogen production was identified.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Thermodynamics
Supaporn Wilailak, Jae-Hyeon Yang, Chul-Gu Heo, Kyung-Su Kim, Se-Kyung Bang, In-Ho Seo, Umer Zahid, Chul-Jin Lee
Summary: This study investigates the integration of a 300 kW Phosphoric Acid Fuel-Cell (PAFC) and the Organic Ranking Cycle (ORC) for generating additional electricity through heat recovery. Through a thermo-economic analysis, it is found that utilizing ammonia as the working fluid results in the greatest net profit, approximately 149 KV, with a payback time of 3.3 years.
Article
Thermodynamics
Hussain A. Alibrahim, Siddig S. Khalafalla, Usama Ahmed, Seongho Park, Chul-Jin Lee, Umer Zahid
Summary: This study explores the production of syngas through standalone process models and integrated designs combining gasification and dry reforming. The integrated designs show improved energy efficiency, reduced CO2 emissions, and the lowest production cost of syngas among all designs.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Engineering, Chemical
Firas S. Alrashed, Sagheer A. Onaizi, Feraih S. Alenazey, Safia El-Bok, Umer Zahid
Summary: This paper investigates the performance analysis of the PdAu membrane in a packed bed reactor loaded with Ni-based catalysts in clean energy systems based on hydrogen fuels. A comparative analysis was conducted between methane steam reforming and prereformed naphtha. The study demonstrates that prereformed naphtha exhibits slightly better performance in terms of methane conversion and hydrogen yield under certain operational conditions, with lower energy consumption compared to steam methane reforming.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Chemistry, Multidisciplinary
Seongho Park, Mohamed Atwair, Kyeongsu Kim, Ung Lee, Jonggeol Na, Umer Zahid, Chul-Jin Lee
Summary: TDI is an important raw material for producing flexible polyurethane foam. Cold phosgenation reactor is crucial for TDI production, and optimal design is essential for improving overall process efficiency. A Bayesian optimization framework was developed to design and optimize TDI reactors, reducing urea selectivity by 11.6% compared to basic design scheme.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Usama Ahmed, Umer Zahid, Sagheer A. Onaizi, Abdul Gani Abdul Jameel, Nauman Ahmad, Nabeel Ahmad, Hamad AlMohamadi
Summary: A process integration framework based on an energy mix system is proposed in this study to produce cleaner fuels. Results show that the novel configuration in case 2 offers higher methanol and H-2 production rates with lower energy requirements compared to the base case process in case 1.
APPLIED SCIENCES-BASEL
(2021)
Article
Engineering, Chemical
Fayez Nasir Al-Rowaili, Siddig S. Khalafalla, Dhaffer S. Al-Yami, Aqil Jamal, Usama Ahmed, Umer Zahid, Eid M. Al-Mutairi
Summary: The study focuses on converting vacuum residue into high grade methanol using gasification technology. Simulation results show that the VRTM process has higher energy efficiency and lower methanol production cost compared to the SRTM process.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2022)
Article
Green & Sustainable Science & Technology
Usama Ahmed, Muhammad Arsalan Hussain, Muhammad Bilal, Hassan Zeb, Umer Zahid, Sagheer A. Onaizi, Abdul Gani Abdul Jameel
Summary: The study indicates that the efficiency of syngas production from low-rank coals can be as high as 50.86%, with the potential to achieve low carbon emissions. Economic analysis reveals that the investment and minimum selling prices per tonne of syngas production are EUR 163.92 and EUR 180.31, respectively.
Article
Energy & Fuels
Faisal Alboqami, Vincent C. O. van Oudenhoven, Usama Ahmed, Umer Zahid, Abdul-Hamid Emwas, S. Mani Sarathy, Abdul Gani Abdul Jameel
Summary: This research presents an innovative approach to predict the optimal fuel blending mechanism using genetic algorithms and artificial neural networks. The system analyzes different fuel inputs and derives multiple recipes to meet desired specifications. The results show the success of the integrated system in mitigating undesirable blending scenarios.
Article
Polymer Science
Ali A. Al-Qadri, Usama Ahmed, Abdul Gani Abdul Jameel, Umer Zahid, Muhammad Usman, Nabeel Ahmad
Summary: The global energy demand is expected to increase significantly, and plastic thermochemical recycling is a potential alternative to meet this demand. The study found that integrating plastic gasification with steam methane reforming can increase hydrogen production and process efficiency, while reducing emissions and production costs.
Article
Engineering, Chemical
Abdul Gani Abdul Jameel, Ali Al-Muslem, Nabeel Ahmad, Awad B. S. Alquaity, Umer Zahid, Usama Ahmed
Summary: This study develops a machine-learning-based model for predicting the enthalpy of combustion of various oxygenated fuels. By constructing an artificial neural network model and training it with a detailed dataset, the model accurately predicts the enthalpy of combustion and discusses the influence of different functional groups.
Article
Chemistry, Multidisciplinary
Ali A. Al-Qadri, Usama Ahmed, Abdul Gani Abdul Jameel, Umer Zahid, Nabeel Ahmad, Muhammad Shahbaz, Medhat A. Nemitallah
Summary: The study focuses on thermochemical recycling of waste tires to produce hydrogen, which is considered an effective way to reduce waste and meet energy demands. Integrating waste tire gasification system with natural gas reforming unit can improve syngas quality and H2 production, while reducing CO2 emissions and production costs.
Article
Thermodynamics
Umer Zahid, Siddig S. Khalafalla, Hussain A. Alibrahim, Usama Ahmed, Abdul Gani Abdul Jameel
Summary: This study investigates the production of high purity methanol through autothermal reforming (ATR) process technology. Two different production cases were analyzed, and the co-production of hydrogen was found to decrease methanol production. The proposed co-production route offers flexibility to adjust production according to customer demand. The study also found that the proposed case consumes less energy compared to the case where only methanol is produced. Sensitivity analysis shows that as the split ratio increases, methanol production decreases, leading to a decrease in the total energy requirement. An economic comparison showed that the co-production case is more profitable than the single production case.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Multidisciplinary Sciences
Abdul Gani Abdul Jameel, Chandrakant Dahiphale, Awad B. S. Alquaity, Umer Zahid, Sreenivas Jayanti
Summary: Burner tilt has a significant effect on the flow and heat transfer inside a boiler, reducing nitrous oxide emissions and residence time of coal particles in high temperature zones while lowering the exit gas temperature. The thermal NOx mechanism and NOx reburning play key roles in reducing NOx emissions in utility boilers.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2022)