Article
Chemistry, Physical
Lucas Clementino Moura, Guilherme Botelho Meireles de Souza, Isabela Milhomem Dias, Sergio Botelho Oliveira, Thiago Leandro de Souza, Christian Goncalves Alonso
Summary: Supercritical water gasification technology is a promising alternative for producing H2 rich gas from renewable sources, and the efficiency of a synthesized Ni-based catalyst supported in cordierite honeycomb structure on the ScWG of glycerol was evaluated and compared with two commercial automotive catalysts. The results demonstrated the great potential of the prepared catalyst to improve H2-rich gas production from glycerol gasification.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Polymer Science
Thayli Ramires Araujo, Daniela Bresolin, Debora de Oliveira, Claudia Sayer, Pedro Henrique Hermes de Araujo, Jose Vladimir de Oliveira
Summary: The valorization of lignin in polyurethane products enables the utilization of this biomass, which is the second most abundant natural polymer in the world. However, the complex and cross-linked molecular structure of lignin limits its use, making it necessary to develop methods to make lignin more reactive. Chemical modification and fragmentation are among the methods that have been developed, but research on the production of lignopolyols derived from enzymatic catalysis applicable to polyurethanes is lacking.
EUROPEAN POLYMER JOURNAL
(2023)
Article
Chemistry, Physical
Szymon Glowacki, Agnieszka Salamon, Mariusz Sojak, Weronika Tulej, Andrzej Brys, Taras Hutsol, Marek Salamon, Savelii Kukharets, Monika Janaszek-Mankowska
Summary: The study aimed to assess the potential use of brewer's spent grains (BSGs) for energy purposes, determining their calorific value and chemical composition. Samples from a brewery in Poland were analyzed, showing that convective drying reduces the water content and improves energy properties.
Article
Chemistry, Multidisciplinary
Natalie S. Schunck, Stefan Mecking
Summary: Sustainable sources are crucial for chemicals production, and microalgae have the potential to catalytically convert renewable substrates inside living cells, generating valuable building blocks for chemical production.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Multidisciplinary
Stefanie de Roo, Felix Einsiedler, Stefan Mecking
Summary: This study demonstrates the catalytic conversion of renewable plant oils, including microalgae and waste oil, into industrially relevant alpha-olefins in the C-3 to C-10 regime. The biorefinery concept involves a catalytic sequence of ethenolysis, double bond isomerization, and subsequent ethenolysis, effectively rearranging the fatty acid chains into valuable chemical building blocks. Supercritical carbon dioxide (scCO(2)), a benign extraction and reaction solvent, is utilized.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Review
Chemistry, Multidisciplinary
Ursula Biermann, Uwe T. Bornscheuer, Ivo Feussner, Michael A. R. Meier, Juergen O. Metzger
Summary: Oils and fats of vegetable and animal origin are important renewable feedstock for the chemical industry, with their industrial use increasing significantly in the past decade. Remarkable achievements in oleochemistry include reduction of fatty esters, selective oxidation of double bonds, synthesis of alkyl-branched compounds, and applications in the synthesis of polymeric materials.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Multidisciplinary
Kaori Saito, Yutaka Makimura, Hiroshi Nishimura, Takashi Watanabe
Summary: The study identified that phenolic units in lignin are primarily connected by beta-5, beta-1, and beta-O-4 linkages, with an abundance of approximately 20%. Lignin polymerization terminates with these three linkages, which are explained by a radical coupling mechanism. Unexpectedly, 5-5, 4-O-5, and beta-beta linkages connecting phenolic units were not detected, indicating further elongation to form nonphenolic units.
Article
Chemistry, Multidisciplinary
Nils Heppe, Charlotte Gallenkamp, Stephen Paul, Nicole Segura-Salas, Niklas von Rhein, Bernhard Kaiser, Wolfram Jaegermann, Atefeh Jafari, Ilya Sergueev, Vera Krewald, Ulrike I. Kramm
Summary: In order to achieve a future hydrogen economy, there is a need for non-precious metal catalysts for water splitting reactions that can be used globally. Metal-nitrogen-carbon (MNC) catalysts with active sites consisting of a metal center with fourfold coordination of nitrogen (MN4) have shown promising performance, but their optimization has been hindered by their low structural definition. By studying porphyrin model complexes, insights from well-defined molecules are transferred to MNC systems in order to evaluate the effect of porphyrin substituents on the electronic and electrocatalytic properties of MN4 centers for the hydrogen evolution reaction (HER) in aqueous electrolyte. The choice of substituent was found to impact their utilization on the carbon support and their electrocatalytic performance.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Correction
Chemistry, Multidisciplinary
Sanny Verma, R. B. Nasir Baig, Mallikarjuna N. Nadagouda, Christophe Len, Rajender S. Varma
Summary: This study proposes a sustainable pathway to furanics from biomass via heterogeneous organo-catalysis.
Review
Engineering, Environmental
Mengzhu Li, Weinan Yin, Junan Pan, Yanwei Zhu, Ning Sun, Xinyu Zhang, Yingtong Wan, Zhongzhong Luo, Lanhua Yi, Longlu Wang
Summary: Hydrogen spillover, a phenomenon of active species migration, has received considerable attention in recent years. It not only participates in catalytic reactions as reactants, but also induces support to form defects or phase transitions, thereby adjusting the energy band and improving catalytic performance. As a result, hydrogen spillover has broad potential applications in heterogeneous catalysis and hydrogen production. However, there is still a lack of clear summary on the reaction mechanism and important applications of hydrogen spillover. This review focuses on the recent progress of hydrogen spillover, including different types, structural models, and applications, aiming to provide new ideas for the design and application of hydrogen spillover.
CHEMICAL ENGINEERING JOURNAL
(2023)
Review
Chemistry, Multidisciplinary
Yuanyong Yao, Shixue Chen, Meng Zhang
Summary: This review introduces the latest studies on the conversion of cellulose into 5-HMF. Solid acids, such as heterogeneous catalysts, have been widely used in this process, and some novel solid acids with Brønsted and/or Lewis acidic sites, such as sulfonated solid acids, carbon-based acids, and zeolite particles are listed.
FRONTIERS IN CHEMISTRY
(2022)
Article
Environmental Sciences
Suiyi Li, Yingji Wu, My Uyen Dao, Elena-Niculina Dragoi, Changlei Xia
Summary: Recently, research has focused on using catalysis to convert biomass into environmentally friendly fuels. Challenges include processing lignocellulosic sources and developing/optimizing efficient catalysts for biomass fuel production. This paper reviews advancements in catalyst procedures and evaluates methods used in catalytic biomass pyrolysis. Understanding the catalytic conversion process of lignocellulosic biomass into bio-oil remains a key research challenge in biomass catalytic pyrolysis.
Review
Thermodynamics
Joshua Iseoluwa Orege, Olayinka Oderinde, Ghebretensae Aron Kifle, Adeola Ahmed Ibikunle, Saheed Abiola Raheem, Onome Ejeromedoghene, Emmanuel Sunday Okeke, Olubunmi Michael Olukowi, Odunola Blessing Orege, Emmanuel Oluwaseyi Fagbohun, Taiwo Oladapo Ogundipe, Esther Praise Avor, Omoyemi Oluwatosin Ajayi, Michael Olawale Daramola
Summary: Heterogeneous catalysis provides a viable alternative for low-cost biodiesel production, and catalytic transesterification is considered the most feasible synthesis method. Nine commonly used heterogeneous catalysts have been studied, with a focus on versatile catalysts with high activity and low production cost.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Review
Environmental Sciences
Mohammed S. Seleem, Rasha Sameh, Rehab R. Esily, Dalia M. Ibrahiem
Summary: With the increasing urgency of achieving climate goals, bio-hydrogen is considered as the best alternative to fossil fuels. The study suggests that policymakers should focus on establishing a new legal framework to regulate hydrogen production projects and provide financial incentives for energy-intensive companies to switch to green hydrogen.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Agricultural Engineering
Xin Wang, Yu Zhang, Suyuan Jia, Haoyu Deng, Wenbiao Xu, Junyou Shi
Summary: The effective utilization of lignin is crucial for sustainable biomass conversion and the development of renewable resources. This study focuses on the catalytic oxidative transformation of lignin and explores its structural features and their impact on product diversity. The content of beta-O-4 linkages in lignin and the presence of S-type structural units are found to be important factors that influence the yield and efficiency of the conversion process. However, the complex nature of lignin presents challenges for its efficient depolymerization and utilization. A comprehensive understanding of lignin's structure is crucial for advancing its effective utilization and the development of renewable resources.
INDUSTRIAL CROPS AND PRODUCTS
(2024)
Article
Multidisciplinary Sciences
Xiaorui Zhao, Yueqiang Cao, Linlin Duan, Ruoou Yang, Zheng Jiang, Chao Tian, Shangjun Chen, Xuezhi Duan, De Chen, Ying Wan
Summary: The use of Pd interstitial nano catalysts supported on ordered mesoporous carbon as catalysts for bisarylation of heteroarenes has shown high efficiency and selectivity, with no need for base, ligands, or phase transfer agents, and can be conducted in water. The catalytic reactivity is attributed to parallel adsorption of heteroarenes over Pd clusters, breaking the barrier to electron transfer and creating dual electrophilic sites. These findings suggest alternative synthesis pathways for a variety of organic chemicals using ordered mesoporous carbon supported palladium catalysts.
NATIONAL SCIENCE REVIEW
(2021)
Article
Engineering, Chemical
Zhaohui Chen, Yasi Mo, Dong Lin, Yongxiao Tuo, Xiang Feng, Yibin Liu, Xiaobo Chen, De Chen, Chaohe Yang
Summary: Efficient carbon material with enhanced mass transfer ability was constructed from vacuum residuum through a one-pot synthesis process. Hollow carbon cubes were successfully synthesized using CTAB surfactant to emulsify and form oil-in-water suspension particles. The metal-free catalyst showed good catalytic stability and high selectivity towards direct electrochemical production of hydrogen peroxide.
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2021)
Article
Engineering, Chemical
Hassan J. Dar, Hugo A. Jakobsen, Kumar R. Rout, Klaus J. Jens, De Chen
Summary: By analyzing the autothermal gas-phase oxidative dehydrogenation of ethane using reactor simulations and a kinetic model, the optimum operating conditions were determined to be an inlet temperature of 1023K and a C2H6/O-2 ratio of 3.3. Multiple oxygen injections and optimizing the overall C2H6/O-2 ratio were found to be effective ways to enhance ethylene yield.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Chemistry, Physical
Juntian Niu, Yalan Wang, Shirley E. Liland, Samuel K. Regli, Jia Yang, Kumar R. Rout, Jun Luo, Magnus Ronning, Jingyu Ran, De Chen
Summary: By introducing Pt atoms into the surface of nickel catalysts, an enhanced active and stable Ni-based catalyst for methane dry reforming reaction was synthesized. The bimetallic Pt-Ni catalysts simultaneously enhance activity, increase H2/CO ratio, and improve stability by resisting carbon deposition. Density-functional theory calculations explained the higher coke resistance of Pt-Ni catalysts compared to monometallic samples.
Article
Chemistry, Physical
Xiaoli Yang, Jia Yang, Yalan Wang, Tao Zhao, Haoxi Ben, Xuning Li, Anders Holmen, Yanqiang Huang, De Chen
Summary: The Na and S-modulated FeMnOx catalysts play a crucial role in enhancing CO conversion, promoting olefin formation, and suppressing methane generation in Fischer-Tropsch synthesis of light olefins. Multiple characterizations and kinetic analysis confirmed that the promoters increase the formation of active species and lower CO activation energy. The study provides a practical strategy for developing highly active and stable FTO catalysts.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Article
Chemistry, Physical
Yongxiao Tuo, Ying Meng, Chen Chen, Dong Lin, Xiang Feng, Yuan Pan, Ping Li, De Chen, Zhanning Liu, Yan Zhou, Jun Zhang
Summary: Platinum group metals show high potential for dehydrogenation of liquid organic hydrogen carriers, but the strong adsorption of dehydrogenation product has hindered catalyst performance. Strong interactions between Pt and MgAl2O4 result in partial positively charged Pt, reducing naphthalene adsorption and enhancing decalin dehydrogenation activity. This study reveals a new approach to construct highly efficient metal catalysts for LOHCs.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Multidisciplinary
Jonas Van Belleghem, Jia Yang, Pieter Janssens, Jeroen Poissonnier, De Chen, Guy B. Marin, Joris W. Thybaut
Summary: An extended Single-Event MicroKinetic (SEMK) model successfully simulated Steady State Isotopic Transient Kinetic Analysis (SSITKA) data for Co catalyzed Fischer-Tropsch Synthesis (FTS), providing meaningful estimates for activation energies and atomic chemisorption enthalpies. The model analysis revealed the nature of two site types and the reaction preference for CO on step sites, as well as the role of terrace sites in methane production and alkane hydrogenation. The metal particle size effect was attributed to the increasing importance of terrace sites on reaction kinetics.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2022)
Article
Chemistry, Physical
Jie Yang, Erlend Bjorgum, Hui Chang, Ka-Ke Zhu, Zhi-Jun Sui, Xing-Gui Zhou, Anders Holmen, Yi-An Zhu, De Chen
Summary: Research has shown that the dynamic nature of active sites on La-Fe-based perovskites in chemical looping methane oxidation is influenced by the Fe coordination environment (and hence the oxygen vacancy concentration), which is the key parameter governing the catalyst selectivity.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Article
Thermodynamics
Xin Zhou, Shangfeng Li, Yuan Wang, Jiewenjing Zhang, Zhibo Zhang, Changgui Wu, Xiaobo Chen, Xiang Feng, Yibin Liu, Hui Zhao, Hao Yan, Chaohe Yang
Summary: The study introduced a novel hierarchical catalytic cracking process for crude oil, leading to increased conversion rate and olefin yields. Optimization of key operating parameters improved hydrogen and carbon atoms efficiency, net present value, and internal rate of return. Additionally, the novel process reduced greenhouse gas emissions, wastewater generation, and non-renewable energy consumption compared to conventional processes.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Engineering, Chemical
Isaac Yeboah, Xiang Feng, Kumar R. Rout, De Chen
Summary: By utilizing nonprecious dual-bed catalysts in a continuous-flow reactor, bioderived oxygenates with various functional groups were successfully converted into high yield and high purity hydrocarbons in the jet fuel range, providing a versatile and atom-economic strategy for upgrading bio-oilderived oxygenates.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Chemistry, Physical
Xianhu Sun, Dongxiang Wu, Wenhui Zhu, Xiaobo Chen, Renu Sharma, Judith C. Yang, Guangwen Zhou
Summary: By combining environmental transmission electron microscopy and atomistic modeling, the study provides direct in situ atomic-scale observations of the surface and subsurface dynamics during CuO reduction, revealing the crucial role of oxygen vacancies in the reduction process.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Xiukuang Zhang, Jie Yin, Qian Lei, Xiangpeng Meng, Xiaobo Chen, Zhou Li
Summary: The study showed that high-throughput fabrication using directed energy deposition allowed for rapid production of gradient Cu-Fe-Cr alloys, with liquid diffusion and decomposition precipitation contributing to gradient variation in microstructure and composition, leading to increased hardness. Machine learning was successfully employed to predict alloy hardness, aiding in the acceleration of alloy design and fabrication.
Article
Optics
Xiao Yang, Xiaobo Chen, Juntong Xi
Summary: This work presents an efficient initial value estimation method for speckle control points matching using digital image correlation (DIC) based on perspective transformation. The proposed method achieves higher calibration accuracy compared to regular planar chessboard or circular marker array calibration targets, as well as higher measurement precision compared to the speckle pattern calibration method that uses SIFT-based initial value estimation.
Article
Chemistry, Physical
Qing Lu, Chen Chen, Qian Di, Wanli Liu, Xiaohui Sun, Yongxiao Tuo, Yan Zhou, Yuan Pan, Xiang Feng, Lina Li, De Chen, Jun Zhang
Summary: Efficient and stable electrocatalysts are crucial for the electrocatalytic CO2 reduction reaction (CO2RR) into chemical products. In this study, a NC@Ni/C nano-composite with a core-shell structure was developed as an effective electrocatalyst for CO2RR to CO over a wide potential range. The catalyst exhibited high CO Faradaic efficiency and excellent stability, primarily attributed to the pyridinic-N doping in the carbon shell of Ni NPs.
Review
Chemistry, Physical
Wenyao Chen, Xuezhi Duan, Xinggui Zhou, De Chen
Summary: The vast reserves of shale gas worldwide have significantly impacted the global energy and chemical markets by increasing the production of hydrocarbons and their derivatives. The key challenge is to find alternative reaction pathways for converting alkanes into valuable chemicals with high yield under mild conditions.