Article
Chemistry, Multidisciplinary
Qingying Liu, Jiang Wang, Zhenxing Liu, Ruisheng Zhao, Aiju Xu, Meilin Jia
Summary: Mesoporous B-MCM-41 catalysts with varying boron content (B/Si = 0.015-0.147) were prepared using a simple hydrothermal synthesis method. The catalyst with B/Si = 0.048 exhibited favorable activity, stability, and water tolerance in the oxidative dehydrogenation of propane reaction. The active sites for ODHP were identified as the tri-coordinated B-OH species incorporated into the mesoporous silica framework.
Article
Chemistry, Applied
Evgeny R. Naranov, Alexey A. Sadovnikov, Aram L. Bugaev, Damir A. Shavaleev, Anton L. Maximov
Summary: A series of micro-mesoporous materials with nanosponge structure were synthesized in accelerated mode, with thorough investigation on the influence of perchlorate oxyanion promoter on the materials characteristics. The effect of promoter concentration on crystalline structure was demonstrated, and a novel hydrothermal method was developed for synthesis within 18 hours.
Article
Chemistry, Multidisciplinary
Syed A. Ali, Faisal M. Almulla, B. Rabindran Jermy, Abdullah M. Aitani, Raed H. Abudawoud, Mohammed AlAmer, Ziyauddin S. Qureshi, Thamer Mohammad, Hassan S. Alasiri
Summary: The study focuses on the synthesis and characterization of hierarchical composites of MCM-41 on zeolite Beta for catalytic conversion of heavy reformate into valuable xylenes. Systematic optimization of hierarchical pore generation was achieved by varying the strength of the alkaline solution during disintegration of zeolite Beta. The results show enhanced xylene yield and selectivity, as well as improved catalytic performance with the incorporation of a mild hydrogenation function.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2021)
Article
Materials Science, Ceramics
Tiago Fernandes de Oliveira, Marta Ligia Pereira da Silva, Andre Luis Lopes-Moriyama, Carlson Pereira de Souza
Summary: The study successfully prepared a novel bimetallic mesoporous material MCM-41 by incorporating niobium and tantalum into the molecular sieve structure through direct hydrothermal synthesis, and verified the successful replacement of silicon atoms by metallic cations through various characterization techniques. The catalyst demonstrated good structural order preservation and high specific surface area, making it suitable for various applications.
CERAMICS INTERNATIONAL
(2021)
Article
Energy & Fuels
Tengwei Chen, Cheng Gu, Ying Ouyang, Li Zhuang, Zhen Yao, Kang Zou, Yongrui Wang, Yibin Luo, Xingtian Shu
Summary: Zeolite Beta synthesized with crosslinked starch showed improved properties in terms of particle size, silanol group content, aluminum ratio, and acid site ratio compared to Zeolite Beta-0 without crosslinked starch. Phosphorus-modified Zeolite Beta synthesized with crosslinked starch exhibited enhanced hydrothermal stability and higher activity and yield in catalytic cracking reactions.
Article
Materials Science, Ceramics
Wafaa S. Abo El-Yazeed, Sohier A. El-Hakam, Reda S. Salama, Amr A. Ibrahim, Awad Ahmed
Summary: In this study, silver exchanged phosphomolybdic acid catalysts were synthesized and characterized. The results showed that the catalysts had good crystallinity, strong Lewis acidity, and weak Bronsted acidity. The prepared catalysts exhibited good catalytic activity in the synthesis 7-hydroxy-4-methyl coumarin and hydroquinone diacetate.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2022)
Article
Energy & Fuels
Pawanpreet Kaur, Harish Kumar Chopra
Summary: Supported ionic liquids (SILs), immobilized ILs onto solid support materials, have shown advantages over pure ILs in various applications. In this study, new SILs were synthesized by immobilizing S-alkyl/aryl-substituted 2-mercaptobenzothiazolium-based ILs onto MCM-41 silica support. The synthesized SILs were characterized, and their performance in removing sulfur-containing aromatic species from gasoline was investigated. MCM-41@[S-BzBTh][Cl] showed excellent sulfur removal efficiency from model gasoline.
Article
Environmental Sciences
Son Tung Pham, Manh B. Nguyen, Giang H. Le, Trinh Duy Nguyen, Chinh D. Pham, Thanh Son Le, Tuan A. Vu
Summary: The study successfully prepared Al-MCM-41 solid acids with modified Si/Al molar ratio and utilized them as catalysts for the conversion of cellulose to 5-HMF. Characterization of the synthesized acids revealed the importance of different acid sites in determining the 5-HMF yield.
Article
Chemistry, Physical
Natalia Szczepanik, Andrzej Kowalczyk, Zofia Piwowarska, Lucjan Chmielarz
Summary: In this study, MCM-41-type mesoporous silicas were modified with alumina using different methods, and the properties of the obtained materials were characterized and tested for catalytic performance. The results showed that the performance of the catalysts depended on the contribution and aggregation of surface-exposed aluminum species. The most active catalyst could be effectively regenerated under certain conditions.
Article
Multidisciplinary Sciences
Worapak Tanwongwan, Nuwong Chollacoop, Kajornsak Faungnawakij, Suttichai Assabumrungrat, Puritut Nakhanivej, Apiluck Eiad-ua
Summary: Zeolite, especially MCM-22 zeolite, is a promising material with excellent intrinsic properties for environmental solutions. In this study, a sustainable synthesis route of MCM-22 zeolite using natural resources as starting materials was demonstrated. The results showed that high purity MCM-22 zeolite can be obtained from rice husk silica and aluminosilicate gel extracted from kaolin. Evaluation of reaction time and RHS/ASG ratio on the crystallinity and surface area of MCM-22 was conducted, and the optimal product exhibited desired acidity. Rating: 8/10.
Article
Materials Science, Multidisciplinary
Kaiyuan Xie, Baishun Jiang, Zhuo Wang, Shufeng Zuo, Qiuyan Wang
Summary: Based on quantitative pyrolysis of ammonium sulfate, this paper explores the sulfur tolerance of Pd/beta zeolite in the catalytic conversion of toluene. The changes in pore structure, valence, acidity, oxidation, and adsorption/desorption behavior were investigated through various methods. The results reveal the structural stability of Pd/beta zeolite during sulfur poisoning and provide insights into the sulfur poisoning process and the intrinsic sulfur tolerance mechanism of Pd/beta zeolite.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Energy & Fuels
Artita Na Rungsi, Thuong Hai Truong, Chachchaya Thunyaratchatanon, Apanee Luengnaruemitchai, Nuwong Chollacoop, Shih-Yuan Chen, Takehisa Mochizuki, Hideyuki Takagi, Yuji Yoshimura
Summary: The study investigated the partial hydrogenation of soybean oil-derived fatty acid methyl esters using MCM-41 mesoporous silica-supported Pd-Pt bimetallic catalysts, resulting in the production of H-FAME enriched in mono-FAME as a potential source for high blends of biodiesel fuel. Various MCM-41 supports with different structural properties and morphologies were synthesized using different amounts of ammonia solution, leading to a series of Pd-Pt/MCM-41 bimetallic catalysts with tunable porosity.
Article
Chemistry, Physical
Zhili Wang, Weifeng Chu, Zhenchao Zhao, Zhengmao Liu, Hongyu Chen, Dong Xiao, Ke Gong, Fan Li, Xiujie Li, Guangjin Hou
Summary: This study comprehensively investigated the roles of different SDAs in selective Al substitution in MCM-49 zeolite using multinuclear solid-state NMR. The results showed that different SDAs have distinct impacts on Al distributions in the zeolite structure, with varying levels of T-2, T-6, and T-7 Al observed depending on the type of SDA used.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Applied
Tareq W. M. Amen, Shohei Washiyama, Akira Oda, Takeshi Ohtsu, Atsushi Satsuma, Nao Tsunoji
Summary: The study synthesized small-pore zeolites with different frameworks and found that Pd-loaded CHA, AEI, and LEV zeolites, as well as high-silica AFX zeolites, exhibited high NOx adsorption capabilities. However, Pd incorporation into low Si/Al ratio AFX zeolite resulted in significant hydrothermal damage, leading to lower levels of adsorption and desorption capabilities.
MICROPOROUS AND MESOPOROUS MATERIALS
(2023)
Article
Chemistry, Physical
Huimin Wang, Wei Li, Siyuan Xu, Mo Liu, Jiming Hao, Ping Ning, Qiulin Zhang
Summary: The study demonstrated the importance of La doping in improving the hydrothermal aging stability and superior catalytic activity of Cu/SAPO-34 catalyst, effectively preventing structure collapse and Cu2+ ion transformation. Cu/La-SAPO-34 catalyst showed higher catalytic activity under hydrothermal aging conditions, indicating great potential for applications.
MOLECULAR CATALYSIS
(2021)
Article
Engineering, Environmental
Huawang Zhao, Xiaoyin Chen, Alexander J. Hill, Guohua Jing, Yongdan Li, Johannes W. Schwank
Summary: Pd/SSZ-13 catalysts were investigated for the simultaneous storage of NO and C3H6 at 100 degrees C. The effects of the state of Pd species on co-adsorption and release were studied under simulated exhaust conditions. The results showed that the NO storage capacity at 100 degrees C was enhanced by simultaneous NO + C3H6 adsorption. DRIFTs results showed that Pd2+ provides the adsorption sites for NO + C3H6 to form Pd2+(NO) (C3H6), which alleviates the inhibition effect of H2O on NO adsorption on Pd ions. The different release behaviors of NO + C3H6 are discussed based on the chemistry of NO and C3H6 adsorption and the effect of intermediate CO.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Qianyuan Qiu, Zheng-Ze Pan, Penghui Yao, Jiashu Yuan, Chun Xia, Yicheng Zhao, Yongdan Li
Summary: A bi-functional catalytic perovskite LaNi0.5Co0.5O3 (LNCO) is utilized as the cathode in a high-efficiency Li-O2 battery with a molten nitrate salt electrolyte at 160 degrees C. This LNCO cathode exhibits stable low charge-discharge overpotential and high energy efficiency over 100 cycles. The discharge product, Li2O, has a porous and fluffy morphology, facilitating the transfer of oxygen and other intermediate species. Li2O as a discharge product enables a higher theoretical specific energy density compared to Li2O2 in ambient temperature Li-O2 batteries.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Huanghao Ning, Wenxue Ji, Yongdan Li, Cuijuan Zhang
Summary: Thermal treatment can improve the catalytic activity of the 5 wt% BaMnO3-CeO2 composite catalyst for NO decomposition. The diffusion of Ce species from CeO2 to BaMnO3 lattice generates oxide ion vacancy, accelerating the rate-determining step and enhancing the catalytic activity.
Article
Chemistry, Physical
Jiashu Yuan, Xiaotang Shi, Qianyuan Qiu, Penghui Yao, Yonggao Xia, Yicheng Zhao, Yongdan Li
Summary: In this study, a flexible freestanding anionic metal-organic framework (MOF)-based membrane was successfully prepared through a solution casting method, which exhibited impressive ionic selectivity and conductivity. The membrane enabled high-capacity retention and accelerated uniform lithium deposition, leading to improved performance of the nonaqueous redox flow batteries (NARFBs).
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Chemistry, Physical
Running Kang, Zirui Zhang, Feng Bin, Xiaolin Wei, Yongdan Li, Guoxing Chen, Xin Tu
Summary: The effects of catalyst support on the CO catalytic ignition performance and reaction pathways were investigated, and it was found that TiO2 or ZSM-5 supports promote copper dispersion and the oxidation process mainly occurs at the phase interface. The Cu and Ce interactions lead to the formation of solid solutions, which enhance the activity of individual copper sites and favor the ignition of CO at low temperatures. The Cu2+ species are reduced to form dicarbonyls, which also take part in the oxidation process.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Engineering, Environmental
Yushuai Sang, Yuhan Ma, Gen Li, Kai Cui, Mingze Yang, Hong Chen, Yongdan Li
Summary: The dissolution and solvolysis processes of enzymatic hydrolysis lignin (EHL) in ethylene glycol were investigated. Ethylene glycol exhibited high EHL solubility and achieved complete EHL dissolution at room temperature. The interactions between ethylene glycol and EHL, such as van de Waals interactions, were found to break the pi-pi stacking in EHL, resulting in complete EHL dissolution. When NaOH and Ni were used as co-catalysts, EHL was efficiently depolymerized at 200 degrees C, and the overall monomer yield reached 18.8 wt%. Fourier transform infrared spectroscopy (FT-IR) and molecular dynamics simulation results showed that the adsorption of ethylene glycol over Ni surface hindered the adsorption of lignin fragments and monomers. Thus, EHL catalytic solvolysis in ethylene glycol occurred in the liquid phase, where OH- of NaOH promoted the EHL linkage breakage and active hydrogen atoms formed on Ni surface stabilized the active monomers.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Electrochemistry
Mengyuan Wang, Xiaosong Zhang, Ziyin Guo, Chunhua Chen, Jiashu Yuan, Yongdan Li, Yonggao Xia, Ya-Jun Cheng
Summary: In this paper, a two-step carbon coating process is developed to suppress irreversible phase transition and excessive side reactions at the electrode-electrolyte interface for high-nickel ternary cathode materials LiNi0.8Co0.1Mn0.1O2 (NCM811). Sucrose is melted and coated onto the particle surface, which is converted into carbon in situ at elevated temperature under oxygen atmosphere. The carbon coating treatment effectively improves the cyclic (96.7% capacity retention after 100 cycles at 1 C) and rate performance (130 mAh g(-1) at 5 C) of the NCM811 cathode.
ELECTROCHIMICA ACTA
(2023)
Article
Engineering, Environmental
Ying Li, Dongdong Chen, Xin Xu, Xinyu Wang, Running Kang, Mingli Fu, Yanbing Guo, Peirong Chen, Yongdan Li, Daiqi Ye
Summary: This review summarizes recent advances in passive NOx adsorbers (PNA) based on palladium-exchanged zeolites for efficient reduction of harmful nitrogen oxides (NOx) emitted from low-temperature diesel exhausts during cold-start conditions. The review discusses the choice of parent zeolite, Pd precursor, and synthetic method for Pd-zeolite synthesis, as well as the effect of hydrothermal aging on Pd-zeolite properties and PNA performance. Mechanistic insights into Pd active sites, NOx storage/release chemistry, and interactions with exhaust components/poisons are gained through the integration of experimental and theoretical methodologies. Novel designs of PNA integration into exhaust after-treatment systems are also presented, along with discussions on major challenges and implications for further development and real-world application of Pd-zeolite-based PNA in cold-start NOx mitigation.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Green & Sustainable Science & Technology
Parminder Kaur, Moonis Ali Khan, Yongdan Li, Ahmed A. S. Al-Othman, Zeid Abdullah Alothman, Mika Sillanpaa, Ville Kuokkanen, Monzur A. Imteaz, Saleh Al-Farraj
Summary: The effectiveness of bifacial mixed metal-metal organic framework (MOF) anodes for municipal wastewater's photoelectro-catalytic (PEC) treatment is explored. The removal efficiency of pollutants from municipal wastewater and the impact of operational parameters are verified using TiO2-Bi(mixed metal)-MOF and TiO2-Sb(mixed metal)-MOF anodes in a visible light range. The study shows that TiO2-Bi(mixed metal)-MOF anodes in the PEC system play a positive role in removing micropollutants and disinfecting municipal wastewater, with high efficiency.
JOURNAL OF CLEANER PRODUCTION
(2023)
Review
Biochemistry & Molecular Biology
Huanghao Ning, Yongdan Li, Cuijuan Zhang
Summary: Reducing CO2 emissions and converting it into valuable chemicals is important, and integrating the capture and utilization processes is a feasible option to reduce transportation costs.
Article
Chemistry, Physical
Xuelan Hou, Hang Zhang, Ramesh Raju, Yongdan Li, Peter D. Lund
Summary: Improving light absorption and conversion ability is crucial for enhancing the performance of photoelectrochemical (PEC) cells in converting solar radiation into chemical energy. This study demonstrates a simple and low-cost method to prepare a nanostructured TiOx film with tunable absorption range from 250 to 2500 nm, surpassing the absorption edge of TiO2. The film shows superior light capture ability and a 10-fold increase in charge carrier transfer rate under AM 1.5 G light. It has potential for large-area PEC cells with promoted charge carriers' transfer.
JOURNAL OF POWER SOURCES
(2023)
Article
Electrochemistry
Bingxue Wu, Jian Zhang, Zhi Yang, Xuanlin Lu, Xin Zhao, Wen Liu, Jiaxuan Chen, Yicheng Zhao, Yongdan Li
Summary: In this study, a Ni-Ce0.8Sm0.2O2-δ anode with low Ni content is successfully synthesized through a polymer-directed evaporation-induced self-assembly strategy. The anode exhibits an enlarged triple-phase boundary region and improved reactivity of lattice oxygen due to the even distribution of Ni. With 5 wt.% Ni, the anode shows the lowest polarization resistance and the highest amounts of oxygen vacancies and Ce3+/Ce4+ redox pairs, resulting in improved charge transfer process and excellent stability.
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Jinze Wu, Hui Liu, Yongdan Li, Cuijuan Zhang
Summary: Amorphous BiOx, prepared on the surface of NASICON electrolyte using the photochemical metal-organic deposition method, can greatly enhance the interfacial properties at the anode side. The Na symmetric cell operates at a critical current density of 1.2 mA cm(-2) and cycles steadily at 0.5 mA cm(-2) for 1000 h at 30 °C.
CHEMICAL COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Najla Grioui, Amal Elleuch, Kamel Halouani, Yongdan Li
Summary: This study investigates the feasibility of using exhausted olive pomace biochar as a fuel in a direct carbon fuel cell. The results confirm the feasibility, with a maximum power density of 10 mW cm(-2) at 700 degrees C. The limited output of the fuel cell is attributed to the high ash content and low volatile matter content of the biochar.
C-JOURNAL OF CARBON RESEARCH
(2023)
Article
Chemistry, Physical
Qianyuan Qiu, Jiaqi Wang, Penghui Yao, Yongdan Li
Summary: In this study, a facile coprecipitation approach was used to synthesize a LaNi0.5Co0.5O3 perovskite oxide with a low annealing temperature, which was then utilized as the cathode material for a lithium-oxygen battery. The assembled battery exhibited superior electrochemical performance and stable operation.
FARADAY DISCUSSIONS
(2023)
Article
Engineering, Chemical
Ri Zhang, Shasha Zhang, Mengyan Ding
Summary: A thin liquid film method is proposed to evaluate sand erosion in annular flow. This method considers the direct interaction between the liquid film and gas core, as well as the entrainment and deposition of droplets. The erosion rate is calculated by considering the effects of liquid entrainment and particle velocity decay. The method is fully verified by comparing with experimental data.
Article
Engineering, Chemical
Yu Suo, Xianheng Su, Wenyuan He, Xiaofei Fu, Zhejun Pan
Summary: This research investigates the mechanical properties of sandstone-shale composite through orthogonal experimental method and discrete element simulation. The results show that different lithologies and thickness ratios can affect the strength and fracture mode of the composite rock samples.
Article
Engineering, Chemical
Maurizio Troiano, Andrea El Hassanin, Roberto Solimene, Alessia Teresa Silvestri, Fabrizio Scala, Antonino Squillace, Piero Salatino
Summary: This study investigates the potential of Fluidized Bed Finishing (FBF) for square flat AlSi10Mg specimens manufactured via Laser-Powder Bed Fusion (L-PBF) additive manufacturing technology. The results show that good finishing can be achieved using rotation-assisted tests, with a maximum reduction of surface roughness by 67%. Steel particles are found to be the most effective bed material.
Review
Engineering, Chemical
Ningbo Song, Wanzhong Yin, Jin Yao
Summary: Seawater's dissolved salts and minerals have various effects on the flotation process, including influencing the characteristics and behavior of flotation factors, as well as affecting the surface of sulfide minerals. In most cases, seawater has adverse effects on the flotation of sulfide minerals, but these effects can be mitigated by adjusting the reagents.
Article
Engineering, Chemical
Kaiqiao Wu, Shuxian Jiang, Victor Francia, Marc-Olivier Coppens
Summary: In rectangular and cylindrical annular fluidized beds, pulsating gas flow can create regular bubble patterns, overcoming challenges seen in conventional units. This study provides new opportunities for modularization of fluidized bed operations.
Article
Engineering, Chemical
Shuo Li, Huili Zhang, Jan Baeyens, Miao Yang, Zehao Li, Yimin Deng
Summary: The paper assesses the behavior of cohesive Geldart C-type particles when fluidized by air with the aid of vibration. It determines that mechanical vibration is a simple and effective method to improve the fluidity of cohesive particles during fluidization.
Article
Engineering, Chemical
Zhenfei Feng, Qingyuan Zhang, Shanpan Liang, Zhenzhou Li, Fangwen Guo, Jinxin Zhang, Ding Yuan
Summary: A new micro/mini-channel heat sink (MCHS) with a combined structure of longitudinal and transverse vortex generators is designed, using Al2O3 nanofluid as the working medium. The study explores the effects of transverse vortex generator shape and longitudinal vortex generator angle on the hydraulic and thermal characteristics, comprehensive performance, entropy generation, and exergy efficiency. The results show that the triangular transverse vortex generator improves the comprehensive performance and exergy efficiency. Combined with the longitudinal vortex generator, the MCHS achieves the best comprehensive performance, entropy generation, and exergy efficiency when the Reynolds number is 742.
Article
Engineering, Chemical
Kostas Giannis, Christoph Thon, Guoqing Yang, Arno Kwade, Carsten Schilde
Summary: This study presents a 3D convolutional neural network (3D-CNN) methodology for generating realistic 3D models of particles. The method trains on 2D projections of particle images to predict their 3D shapes, and evaluates the accuracy of the predictions using Fourier shape descriptors (FSDs). This methodology has wide applications in particle shape analysis.
Article
Engineering, Chemical
Zheng-qing Zhou, Lu-jia Chai, Yu-long Zhang, Ya-bin Wang, Ze-chen Du, Tian-yi Wang, Yu-zhe Liu
Summary: The dynamic oxidation and shell-breaking processes of aluminum nanoparticles (ANPs) during heating were studied using in situ transmission electron microscopy. The results revealed that the changes in shell thickness can be divided into three stages, and the active aluminum content of ANP decreased before shell-breaking.
Article
Engineering, Chemical
Fulei Chen, Huaqing Ma, Zihan Liu, Lianyong Zhou, Yongzhi Zhao
Summary: A particle breakage model based on the particle replacement scheme, using the polyhedral model to describe particles, is proposed in this work to accurately describe the breakage of a large number of particles. Additionally, a fast-cutting algorithm is proposed to reproduce the size distribution of progeny particles determined by the breakage model. The validation and simulation results show satisfactory accuracy, efficiency, and stability of the algorithm.
Review
Engineering, Chemical
Matteo Errigo, Christopher Windows-Yule, Massimiliano Materazzi, Dominik Werner, Paola Lettieri
Summary: Gas-solid fluidized-bed systems have advantages in terms of chemical reaction efficiency and temperature control, making them widely used in industrial applications. However, the design, scale-up, and optimization of these complex units are limited by the lack of deep physical understanding. Non-invasive and non-intrusive diagnostic techniques provide a way for researchers to study these systems without affecting the flow field or directly contacting the medium under study.
Article
Engineering, Chemical
Saeed Fateh, Mohammad Behshad Shafii, Mohammad Najafi, Cyrus Aghanajafi
Summary: Applying a magnetic field to ferrofluids alters their flow characteristics and enhances heat transfer. Through visualization and quantitative investigation, it is found that the magnetic field influences the flow patterns and velocity profiles, improving fluid mixing and vorticity magnitude.
Article
Engineering, Chemical
Lei Gao, Bingbing Wei, Xiaochuan Hu, Zaifeng Yao, Yiwen Fang, Xuejian Gao
Summary: In this study, a numerical model of sand triaxial test was established using discrete element software PFC3D, and an indoor triaxial test was conducted to calibrate the numerical model. The influence of microscopic parameters on the macroscopic mechanical response of sand was analyzed. The results showed that the friction coefficient had the greatest impact on the peak strength and residual strength of the sand's stress-strain curve, and it was positively correlated. The normal tangential stiffness ratio was negatively correlated, while the porosity and boundary flexibility stiffness had minimal influence on it.
Article
Engineering, Chemical
Xuan Liu, Jie Gong, Kai Jiang, Xiaojuan Lai, Yu Tian, Kang Zhang
Summary: This study aimed to improve the performance of lignite coal water slurries (CWSs) by synthesizing a series of three-arm amphiphilic block copolymers. By controlling the relative molecular weight, hydrophilic/hydrophobic ratio, and ionic group content, the apparent viscosity of CWSs was significantly reduced and the static stability was improved. Thermogravimetric testing and XPS analysis were conducted to reveal the mechanism behind the improved performance.
Article
Engineering, Chemical
Lanka Dinushke Weerasiri, Daniel Fabijanic, Subrat Das
Summary: Fluidization at low pressure offers significant benefits for the fine chemical industry. This study investigates the behavior of bubbles and bed expansion under low pressure conditions. It is found that lower pressure leads to larger bubbles, increased bubble quantity, and higher aspect ratio. The predictability is affected by the inhomogeneous fluidization, but low pressure fluidization can generate similar bubble sizes with lower fluidizing mass compared to atmospheric pressure.
