Review
Chemistry, Multidisciplinary
Xiujuan Gao, Junfeng Zhang, Faen Song, Qingde Zhang, Yizhuo Han, Yisheng Tan
Summary: Methanol and dimethyl ether (DME) serve as important platform compounds in the coal chemical, petrochemical, and fine chemical industries. The synthesis of methanol/DME has been industrialized, but with a production capacity exceeding market demand. To make better use of these compounds, the selective oxidation of methanol/DME to produce high value-added chemicals has gained significant attention for its green and environmentally friendly nature. This article provides a summary of recent advancements in the synthesis of formaldehyde, methyl formate, dimethoxymethane, and polyoxymethylene dimethyl ethers through selective oxidation of methanol/DME. The article also explores the challenges and prospects in catalyst design and application, aiming to provide theoretical guidance for activating and cleaving C-O, C-H, or O-H bonds in other alcohol/ether molecules and low-carbon alkanes to synthesize high value-added chemicals.
CHEMICAL COMMUNICATIONS
(2022)
Review
Chemistry, Physical
Joachim Thrane, Uffe V. Mentzel, Max Thorhauge, Martin Hoj, Anker D. Jensen
Summary: This paper provides an overview of efforts to find alternative catalysts for the Formox process and critically assess these alternatives for their industrial potential. The results suggest the possibility of finding catalysts with longer lifetimes and higher efficiency.
Article
Chemistry, Physical
Younhwa Kim, Tae Yong Kim, Chyan Kyung Song, Kyung Rok Lee, Seongjun Bae, Hongseok Park, Danim Yun, Yang Sik Yun, Inho Nam, Jungwon Park, Hyunjoo Lee, Jongheop Yi
Summary: The incorporation of lithium into molybdenum oxide on silica supports has been found to significantly enhance formaldehyde production by controlling the oxidation state of active molybdenum centers. This suggests new strategies for developing active sites in catalytic systems for selective oxidation.
Article
Chemistry, Physical
Joachim Thrane, Christopher Falholt Elvebakken, Mikkel Juelsholt, Troels Lindahl Christiansen, Kirsten M. O. Jensen, Lars Pilsgaard Hansen, Lars Fahl Lundegaard, Uffe Vie Mentzel, Max Thorhauge, Anker Degn Jensen, Martin Hoj
Summary: Molybdenum oxide supported on calcium or strontium hydroxyapatite was investigated as catalysts for selective oxidation of methanol to formaldehyde, showing high activity and selectivity, making it interesting for industrial production.
Review
Chemistry, Physical
Muhammad Irfan Malik, Nicolas Abatzoglou, Ines Esma Achouri
Summary: It is essential to have a detailed understanding and appreciation of the iron molybdate catalyst and its critical role in the processes. Proper formulation of each oxide phase and precise influence on the synthesis methods are crucial for improving the catalyst's selectivity, stability, and lifetime.
Article
Chemistry, Multidisciplinary
Wenjian Wu, Wenzhi Li, Mingwei Wu, Hao Zhang, Chen Zhu, Yihang Jiang
Summary: This study synthesized a novel Cu/MoO3 catalyst using impregnation methods, which can convert methane to methanol in the gaseous phase. The Cu(2)/MoO3 catalyst achieves a maximum STYCH3OH of 47.2 μmol (g-1 h-1) at 600 degrees C with a molar ratio of CH4 : O2 : H2O = 5 : 1.4 : 10.
Article
Chemistry, Multidisciplinary
Chunqiu Han, Yuehan Cao, Wang Yu, Zeai Huang, Fan Dong, Liqun Ye, Shan Yu, Ying Zhou
Summary: By selectively cleaving the C-O bonds in CH3O* intermediates instead of the metal-O bonds, the formation of peroxidation products can be significantly prevented, thus modulating the conversion pathway of methane. This method allows methane to be converted to methanol with a higher rate (325.4 mu mol g(-1) h(-1)) and selectivity (87.0%) under room temperature and atmospheric pressure without the need for external oxidants.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Computer Science, Interdisciplinary Applications
Igor G. I. Iwakiri, Carlos V. Miguel, Luis M. Madeira
Summary: The latest research progress on the hydrogenation of CO2 to methanol is introduced in the article, using technologies such as membrane reactors to increase yield and prolong catalyst lifespan. The split feed strategy helps to improve methanol yield, and the use of SOD membrane can obtain a product stream that is easy to recycle.
COMPUTERS & CHEMICAL ENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
Sinqobile V. L. Mahlaba, Nasseela Hytoolakhan Lal Mahomed, Alisa Govender, Junfeng Guo, Gerard M. Leteba, Pierre L. Cilliers, Eric van Steen
Summary: This study reports the aerobic selective oxidation of methane using platinum catalysts under continuous flow conditions. The addition of water enhances the selectivity towards formaldehyde and increases the reaction activity.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Physical
Jie Wu, Jing Wen, Yang-Xin Yu
Summary: Direct methanol fuel cells running on hydrogen are an appealing alternative power source, but finding an efficient and durable catalyst is challenging due to CO poisoning. Research on the mechanism of methanol oxidation reaction on Mo2P monolayer reveals that MOR occurs through O-H bond scission, leading to the generation of CO that can combine with hydroxyl groups to produce formic acid for better catalyst performance in DMFCs.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Jia Bin Yeo, Jun Ho Jang, Young In Jo, Jeong Woo Koo, Ki Tae Nam
Summary: Utilizing CO2-derived formaldehyde derivatives for fuel additive or polymer synthesis can greatly reduce net carbon dioxide emissions. This study proposes a new electrochemical approach to simultaneously generate formaldehyde derivatives at both electrodes by partially oxidizing methanol and directly reducing CO2. The activation and stabilization of formic acid and formaldehyde in methanol solvent enable the generation of formaldehyde derivatives at the cathode alongside the anode.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Physical
Clint N. Evrard, Lee M. Thompson
Summary: Selective direct oxidation of methane to methanol is an important reaction for efficient utilization of natural gas. Photocatalytic routes have advantages over traditional thermal catalysis, and computational studies are important for understanding the mechanisms of methane oxidation on amorphous SiO2 photocatalysts.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Yangbin Shen, Ziwen Xu, Luqi Wang, Yulu Zhan
Summary: Hydrogen production through bioinspired methanol reforming near room temperature is achieved by using ADH and Ru-MOFs as catalysts, providing a new inspiration for catalytic processes involving enzymes. The hydrogen production rate is sensitive to the pH and temperature of the solution, reaching a maximum of 106.4 mmol h(-1) mol(Ru)(-1) at 35 degrees C, pH 7.5.
Article
Chemistry, Physical
Mustafa Karatok, Mehmet Gokhan Sensoy, Evgeny Vovk, Hande Ustunel, Daniele Toffoli, Emrah Ozensoy
Summary: The presence of different oxygen species on the Ag(111) catalyst surface has different effects on the methanol oxidation reaction, with low O-e coverage efficiently producing formaldehyde and high oxygen coverage triggering surface reconstruction leading to decreased formaldehyde selectivity and increased CO2 production.
Article
Chemistry, Physical
Sinqobile V. L. Mahlaba, Nasseela Hytoolakhan Lal Mahomed, Gerard M. Leteba, Alisa Govender, Eric van Steen
Summary: Platinum-based catalysts can selectively produce formaldehyde through the direct aerobic oxidation of methane in the presence of liquid water. The choice of support material significantly affects the catalyst's activity and product selectivity. Pt/TiO2-Rutile demonstrates high selectivity for formaldehyde formation, while TiO2-P25 leads to the formation of methanol and methoxymethanol. Catalyst deactivation is observed due to the accumulation of polymeric species on the surface.
Article
Chemistry, Physical
Abhijeet Gaur, Matthias Stehle, Marc-Andre Serrer, Magnus Zingler Stummann, Camille La Fontaine, Valerie Briois, Jan-Dierk Grunwaldt, Martin Hoj
Summary: Modulation excitation spectroscopy (MES) coupled with time-resolved X-ray absorption spectroscopy (XAS) was used to study unpromoted and Co-promoted Mo-based hydrotreating catalysts, revealing minute and instantaneous differences in active site composition under the influence of H2S and H2O, with Co promoting stability of molybdenum sulfide. Transient XAS experiments showed reversible oxidation-sulfidation processes during H2O/H2S cycling, and the presence of multiple Co phases did not inhibit the detection of changes occurring at active Co and Mo sites. Additionally, water exhibited higher affinity towards sulfided Mo sites compared to 1-propanol.
Article
Chemistry, Physical
J. A. Andersen, J. M. Christensen, M. ostberg, A. Bogaerts, A. D. Jensen
Summary: This study investigated the plasma-catalytic ammonia decomposition for producing hydrogen using a packed-bed dielectric barrier discharge reactor. The introduction of dielectric materials with certain dielectric constants improved the ammonia decomposition, with MgAl2O4 showing the highest conversion rate. Further studies are needed to optimize the efficiency of this technology.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Engineering, Chemical
Frederik Zafiryadis, Anker Degn Jensen, Weigang Lin, Elisabeth Akoh Hove, Morten Boberg Larsen, Hao Wu
Summary: This study utilizes the Eulerian-Lagrangian multiphase particle-in-cell method to simulate the injection of a gas-liquid spray into a gas-solid fluidized bed. The model accurately predicts the gas temperature distribution within the injection region, but discrepancies may arise due to the presence of wet particle agglomerates in the spray region.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Chemistry, Physical
Max Schumann, Jan-Dierk Grunwaldt, Anker D. Jensen, Jakob M. Christensen
Summary: The Rh-catalyzed CO hydrogenation was studied using Rh/ZrO2 and Rh/SiO2 catalysts. The support effect was found to accelerate the CO dissociation on the metal surface. Additionally, a H-assisted mechanism of CO activation was revealed, and the high CO coverage was shown to be essential for the production of oxygenated products.
JOURNAL OF CATALYSIS
(2022)
Article
Engineering, Environmental
J. A. Andersen, M. C. Holm, K. van't Veer, J. M. Christensen, M. Ostberg, A. Bogaerts, A. D. Jensen
Summary: The study investigates the factors affecting ammonia synthesis in a dielectric barrier discharge reactor, using both experiments and a plasma kinetic model. The effects of plasma power, feed flow rate, N2:H2 feed ratio, gas residence time, temperature, and packing material were examined. The results show that increasing the feed flow rate and gas temperature with a packing material present in the plasma can enhance the ammonia synthesis rate.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Harald Silau, Antonios Melas, Kim Dam-Johansen, Hao Wu, Anders Egede Daugaard, Martin Hoj
Summary: In the study, liquid oligomeric lignin structures were successfully synthesized through the combination of sequential solvent fractionation and catalytic hydrogenolysis. These lignin structures have potential as a bio-based aromatic substitute to fossil-based bisphenol A. The chemical properties of the lignin structures were controlled by the choice of lignin soluble fraction.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Engineering, Environmental
Frederik Zafiryadis, Anker Degn Jensen, Weigang Lin, Sonnik Clausen, Elisabeth Akoh Hove, Morten Boberg Larsen, Hao Wu
Summary: The cracking of sugars to glycolaldehyde and other oxygenates shows potential in lab-scale fluidized beds. This study adopts a gas-phase kinetics model and implements it into the Computational Particle Fluid Dynamics (CPFD) framework to simulate sugar cracking in a pilot-scale circulating fluidized bed riser. The results show good agreement with experimental data and suggest the need for more accurate predictions of product yields.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Chemical
J. A. Andersen, K. van't Veer, J. M. Christensen, M. Ostberg, A. Bogaerts, A. D. Jensen
Summary: The use of ammonia as a storage medium for hydrogen and its plasma-catalytic decomposition for retrieval of hydrogen are investigated. Experimental results show that increasing the specific energy input enhances the ammonia conversion. A kinetic model is used to analyze the decomposition mechanism, indicating that the collisions between NH3 and high-energy electrons initiate the decomposition.
CHEMICAL ENGINEERING SCIENCE
(2023)
Review
Engineering, Chemical
Frederik Zafiryadis, Anker Degn Jensen, Weigang Lin, Elisabeth Akoh Hove, Morten Boberg Larsen, Hao Wu
Summary: This paper provides a thorough and up-to-date review of experimental and numerical investigations of gas-liquid sprays into gas-solid fluidized beds. It presents a phenomenological description of the prevalent mechanisms of gas-liquid injection under different operating conditions and identifies suitable computational fluid dynamic models for simulating the mechanisms involved in gas-liquid-solid interactions, along with recommendations for future work.
Review
Chemistry, Physical
Hamed Baniamerian, Martin Hoj, Matthias Josef Beier, Anker Degn Jensen
Summary: This review discusses the attractive approaches of catalytic conversion of (ligno)cellulosic biomass for the production of valuable oxygenated chemicals and platform molecules under hydrothermal or pyrolysis conditions. To design the most effective catalysts and gain a better understanding of the processes, the main reactions and possible products obtained from cellulose catalytic valorization, specifically diols, are discussed. The review systematically summarizes recent advancements of heterogeneous catalysts and their structure-activity relationships for the selective production of diols from cellulose and cellulose-derived sugars under both pyrolysis and hydrothermal conditions.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Review
Engineering, Environmental
William Gundtorp, Thomas Klint Torp, Anker Degn Jensen
Summary: Due to convenience and toxicity, research on the catalytic oxidation of poly-chlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) is mainly conducted on model compounds instead of PCDD/Fs themselves. This raises questions about the validity of using model compounds to design catalysts for PCDD/F removal. A review of the literature on catalytic destruction of PCDD/Fs and model compounds indicates that their reaction kinetics are similar, but with some deviations in gas phase composition. It is found that V2O5/TiO2-based catalysts are the most studied and achieve higher catalytic activity compared to other non-precious metal catalysts.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Hamed Baniamerian, Martin Hoj, Matthias Josef Beier, Anker Degn Jensen
Summary: Hydrous pyrolysis of glucose is a promising method to produce glycolaldehyde and other valuable oxygenates. A pulsed chromatographic method was proposed to investigate the effect of operating parameters on the product distribution and glycolaldehyde yield. This technique provided insights into the reaction pathways and allowed for determination of the reaction time-frame and rate parameters.
REACTION CHEMISTRY & ENGINEERING
(2023)
Article
Energy & Fuels
Wenhao Hu, Zsuzsa Sarossy, Anker Degn Jensen, Anders Egede Daugaard, Peter Arendt Jensen
Summary: In this study, the pyrolysis of pure low density polyethylene was investigated using a lab-scale two-stage fixed-bed pyrolyzer. Different catalytic materials were used in the second reactor to upgrade the vapors. The results showed that the use of certain catalysts and higher temperatures can significantly decrease the chain length of hydrocarbons in the condensed product and convert the wax into a liquid.
Article
Engineering, Chemical
Qing Han, Mengqing Shi, Linkai Han, Di Liu, Mingwei Tong, Yuxin Xie, Zhonghua Xiang
Summary: Developing highly efficient bifunctional oxygen electrocatalysts is crucial for zinc-air flow batteries. Metal-organic frameworks (MOFs) and covalent organic polymers (COPs) have emerged as promising alternatives due to their designable and controllable atomic-level structures. However, their catalytic performances are limited by conductivity and catalytic activity. In this study, nanosheet FeNi-MOF and iron phthalocyanine rich COP hybrid materials are assembled through the pi-pi stacking effect to create highly efficient bifunctional electrocatalysts. The resulting catalyst exhibits superior catalytic performance and stability, making it a promising candidate for zinc-air flow batteries.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Daria Grigorash, Dmytro Mihrin, Rene Wugt Larsen, Erling H. Stenby, Wei Yan
Summary: The article introduces a new approach to describe the cross-association between molecules, allowing for the simulation of weakly bound molecular complexes with different conformations in mixtures. By incorporating this approach into the equation of state, accurate predictions of vapor-liquid equilibrium and liquid-liquid equilibrium can be made. The new method is validated through experiments on alcohol and acid mixtures, with the results compared to experimental data, demonstrating its accuracy and reliability.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Mohammed Al-Sharabi, Daniel Markl, Vincenzino Vivacqua, Prince Bawuah, Natalie Maclean, Andrew P. E. York, Axel Zeitler
Summary: This study used terahertz pulsed imaging to investigate the transport process of different solvents into ceramic catalytic materials. The results showed that the heating rate of the samples influenced the water transport rate, while the viscosity of 1-octanol slowed down its transport.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Chukwunonso Anyaoku, Sati Bhattacharya, Rajarathinam Parthasarathy
Summary: This study aimed to enhance understanding of settling dynamics in viscoelastic fluids by developing a semi-empirical correlation and a dimensionless ratio, which accurately described the characteristics of settling suspensions.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Antti I. Koponen, Janika Viitala, Atsushi Tanaka, Baranivignesh Prakash, Olli-Ville Laukkanen, Ari Jasberg
Summary: This study focuses on the development of foam application chemicals for the paper and board industry. The research explores the rheology of the polyvinyl alcohol foam used in the process. Measurements were conducted to determine the foam viscosity and slip flow. The results suggest that slip flow contributes significantly to the total flow rate, and the obtained viscosity and slip models provide a solid foundation for industrial processes.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Dalei Sun, Jinghui Cai, Yating Yang, Zhiwu Liang
Summary: In this study, Fe-doped alpha-Bi2O3 catalysts with different Fe/Bi molar ratios were synthesized and utilized in the carbonylation of isobutyl amine with CO2. The results showed that Fe doping significantly enhanced the catalytic abilities of alpha-Bi2O3.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Yuan Tian, Xinxin Wang, Yanrong Liu, Wenping Hu
Summary: This paper predicts the solubility of nitrogen gas in ionic liquids (ILs) using two quantitative structure-property relationship (QSPR) models. By combining machine learning methods and ionic fragments contribution method, the accuracy and reliability of the prediction models are improved.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Liwang Wang, Wei Liu, Pan Yang, Yulong Chang, Xiaoxu Duan, Lingyu Xiao, Yaoming Hu, Jiwei Wu, Liang Ma, Hualin Wang
Summary: This study investigates the effective phase interfacial area (ae) of hydro-jet cyclones at different injection angles. The results show that a 45 degrees upward incidence angle yields the most favorable flow field characteristics for efficient mass transfer. The significant enhancement in ae of the hydro-jet cyclones offers the advantage of reducing equipment volume and cost savings.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Chuanjun Wu, Jiangzhi Chen, Jiyue Sun, I-Ming Chou, Shenghua Mei, Juezhi Lin, Lei Jiang
Summary: In this study, the solubility of H2S hydrate in water was measured using Raman spectroscopy. The results showed that the solubility increases with temperature under certain equilibrium conditions, and the solubility also depends on pressure and temperature under different equilibrium conditions. A thermodynamic model based on the van der Waals-Platteeuw theory was developed to predict the solubility, demonstrating its accuracy.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Lorenzo Brivio, Serena Meini, Mattia Sponchioni, Davide Moscatelli
Summary: This study investigates the influence of three main parameters and proposes a kinetic model to predict the optimal operating conditions for high yield of dimethyl terephthalate (DMT) in the chemical recycling process of polyethylene terephthalate (PET).
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Hongju Lin, Fanhui Liao, Yanchang Chu, Mingyu Xie, Lun Pan, Yuanyuan Wang, Lijian Leng, Donghai Xu, Le Yang, Gangfeng Ouyang
Summary: A honeycomb NiCo/C-Na catalyst with a micro-meso-macroporous structure has been fabricated and shown to have significantly higher catalytic activity for the decarboxylation of fatty acids. It also proves to be efficient in upgrading sludge HTL bio-crude, resulting in a biofuel with decreased viscosity and increased density.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Xiaoxian Li, Rui Li, Min Lin, Mingde Yang, Yulong Wu
Summary: A series of coated non-noble metal porous carbon catalysts were synthesized and applied to the aqueous-phase deoxygenation of algal bio-oil. One of the catalysts showed excellent deoxygenation selectivity and catalytic activity at 250 degrees C. The catalyst exhibited good hydrothermal stability and the reaction mechanism was proposed based on product analysis and active site analysis.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
M. V. Chudakova, M. V. Popov, P. A. Korovchenko, E. O. Pentsak, A. R. Latypova, P. B. Kurmashov, A. A. Pimenov, E. A. Tsilimbaeva, I. S. Levin, A. G. Bannov, A. V. Kleymenov
Summary: A series of catalysts with different potassium contents were prepared using solution combustion synthesis and characterized using various techniques. The results showed that the potassium content affected the phase composition and texture of the catalysts. The addition of a small amount of potassium resulted in a change in particle size distribution, leading to higher hydrogen yield. The Ni-1%K2O/Al2O3 catalyst exhibited the highest hydrogen yield at temperatures of 675 and 750 degrees Celsius.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Aliakbar Roosta, Nima Rezaei
Summary: In this study, we modified the electrolyte cubic plus association equation of state (e-CPA EoS) and integrated it with two electrical conductivity models to estimate the electrical conductivity of 11 monovalent electrolyte solutions in water. The modified e-CPA model demonstrated better performance and the hybridization with electrical conductivity models resulted in two predictive models for estimating the electrical conduction of dilute and concentrated electrolyte solutions. These predictive models showed relative average percentage deviations (AARD) of 11.15% and 13.87% over wide ranges of temperature and electrolyte concentration.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Haoren Niu, Jianzheng Wang, Qingzhu Jia, Qiang Wang, Jin Zhao, Fangyou Yan
Summary: A study developed two quantitative structure-property relationship models for the complexation performance of alpha- and beta-cyclodextrins and validated their stability and predictive ability through internal and external validation. The models showed robustness and satisfactory performance, as demonstrated by the experimental results and model validations. These models can effectively predict the binding constants between cyclodextrins and various types of molecules, providing valuable tools for cyclodextrin design.
CHEMICAL ENGINEERING SCIENCE
(2024)