Article
Chemistry, Physical
Hong Lv, Sen Wang, Yongwen Sun, Jingxian Chen, Wei Zhou, Cunman Zhang
Summary: This study investigates the effect of the anode catalytic layer (ACL) construction on the highly efficient proton exchange membrane water electrolyzer. The innovative design of ACL with three sub-layers and hierarchical pore size distribution resulted in superior electrochemical performance, with a 163 mV lower voltage at 3 A cm-2 compared to ACL without pore-forming treatment. Mercury intrusion porosimetry results showed an increase in porosity from 38.8% to 52.3% after pore-forming treatment. Electrochemical characterization analyses indicated that the hierarchical structure of ACL enhanced active site amount, kinetics, and mass transfer. Therefore, pore-forming treatment is a simple and efficient approach to achieve superior electrolysis performance.
JOURNAL OF POWER SOURCES
(2023)
Article
Electrochemistry
Ronald P. H. Jong, Guido Mul
Summary: In this study, the electrodeposition and utilization of platinum on titanium hollow fibers were investigated under different gas flow rates. The results showed that the gas flow rate influenced the deposition and utilization of platinum, and higher flow rates led to more even distribution and increased surface area of platinum.
Article
Chemistry, Physical
S. Mazzone, A. Campbell, G. Zhang, F. R. Garcia-Garcia
Summary: This study investigates the feasibility of on-board hydrogen production using the Ammonia Cracking Hollow Fibre Converter technology. By studying the catalytic activity of ruthenium-based catalysts on carbon xerogel during the ammonia cracking reaction, it demonstrates the potential of the hollow fibre reactor to be more efficient and require less pressure drop, volume, and catalyst loading compared to a packed bed reactor.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Construction & Building Technology
Jiandong Huang, Yi Zhang, Yuantian Sun, Jiaolong Ren, Zedong Zhao, Junfei Zhang
Summary: This study investigated the pore size distributions and permeability reduction behavior of pervious concrete through laboratory tests. The results showed that while thickness has a negligible effect on permeability, it has a significant impact on clogging behavior.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Electrochemistry
Mayank Sabharwal, Marc Secanell
Summary: Stochastic reconstructions were used to study the effect of catalyst layer pore size distribution and porosity on gas transport and electrochemical performance. The results showed that increasing pore size increased dry effective diffusivity but lowered partially-saturated diffusivity at a given capillary pressure. Porosity and particle size had negligible effect on electrochemical performance, but moderate porosity and small particle size maximized performance under given capillary pressure.
ELECTROCHIMICA ACTA
(2022)
Article
Engineering, Chemical
Bhaumik Sutariya, Santanu Karan
Summary: This article discusses the importance of high flux nanofiltration (NF) membranes and mathematical models for pore size estimation. It provides a detailed discussion on the probability density function (PDF) model and addresses its flaws and the need for standardization.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Engineering, Environmental
Chaolin Wang, Kunpeng Zhang, Yu Zhao, Jing Bi, Lin Ning, Kun Zhang
Summary: This study proposes an extended simplified local density adsorption (SLD) model and combines it with nuclear magnetic resonance (NMR) tests to predict the adsorption amount and pore size distribution of coal samples. The results are beneficial for the prediction and calculation of coal adsorption amount and pore size distribution.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Chemical
Vi T. Nguyen, Ngoc H. Pham, Dimitrios V. Papavassiliou
Summary: This study examined the relationship between velocity magnitude distribution and pore size distribution in different porous media. The results showed that both velocity magnitude and pore size followed the same distribution pattern. This finding has implications for predicting velocity distribution in porous media and controlling velocity by manipulating pore structure.
Article
Thermodynamics
Roksana Muzyka, Edyta Misztal, Joanna Hrabak, Scott W. Banks, Marcin Sajdak
Summary: This study aimed to determine the relationships among temperature, material grain size, heating rate, and retention time, as well as the effects of these variables on the surface morphology of wheat straw biochar. The study found that a high surface area of 400 m2/g and an average pore size of approximately 2.34 nm could be obtained at a temperature of 700 degrees C, a grain size of 0.5-1.0 mm, a heating rate of 20 degrees C/min, and a residence time of 5 min.
Article
Forestry
Dessie T. Tibebu, Stavros Avramidis
Summary: Understanding the fractal dimension of wood pores is essential for studying its macroscopic properties. This research used the pore size distribution to explore the fractal dimension of softwoods and hardwoods. The results revealed significant differences in pore size distribution and fractal dimension values for different pore sizes.
Article
Multidisciplinary Sciences
Sitong Li, Rui Zhang, Guanghao Zhang, Luyizheng Shuai, Wang Chang, Xiaoyu Hu, Min Zou, Xiang Zhou, Baigang An, Dong Qian, Zunfeng Liu
Summary: This study develops a microfluidic manipulation system that can sense and control liquid flow. Torsional and tensile actuators using hollow fibres with spiral nonlinear stress are employed to sense fluid temperature and sort the fluid into desired vessels. The fluid-driven actuators show increased response speed and power density compared to air-driven actuators. This work provides a new design strategy for intelligent microfluidics and inspiration for soft robots and smart devices for biological, optical, or magnetic applications.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Zi-Yian Lim, Junling Tu, Yongjun Xu, Baiman Chen
Summary: This paper presents a post-treatment strategy to develop Ni@HMS catalyst with high catalytic performance for the dry reforming of methane, achieving high conversion rates of methane and carbon dioxide. The Ni particles are confined inside the mesoporous SiO2 shell, inhibiting their mobility and leading to improved catalytic activity.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Multidisciplinary
Elizabeth Barsotti, Mohammad Piri
Summary: The research indicates that the absence of clear capillary condensation in the isotherms of most naturally occurring nanoporous media is due to the broad pore size distribution of the materials. By mixing different sizes of adsorbents, it was found that the phase behavior in different pore sizes is additive, suppressing the appearance of capillary condensation. By comparing isotherms of mixtures to those of single pore sizes, correlations using the Lorentzian function were developed to determine porosity and fluid density straightforwardly.
Article
Engineering, Chemical
Junjie Wang, Shuangfang Lu, Pengfei Zhang, Qi Zhi, Hongsheng Huang
Summary: In this study, ten samples from the Shahejie Formation, Dongying Sag, Bohai Bay Basin, China, were analyzed using argon ion beam milling-scanning electron microscopy (SEM) to reveal the pore distribution characteristics of different lithofacies lacustrine shales. The SEM images showed that interparticle pores at the edges of brittle particles and intraparticle pores in clay mineral aggregates were the main contributing factors to the reservoir spaces in shale reservoirs. Clay and felsic minerals primarily controlled the shale pore sizes, with the clay mineral content inversely proportional to the pore size. The study also found that felsic-rich shales were favorable for shale oil accumulation and seepage, while calcareous shales with a large number of dissolution pores and organic matter content could produce self-generation and self-storage matrix shale oil.
Article
Engineering, Environmental
Eunjoo Koh, Nahyun Cho, Hee Min Park, Yong Taek Lee
Summary: In this study, chemically modified polyvinylidene fluoride (PVDF) hollow fiber membranes with anionic-hydrophilic and hydrophobic materials exhibited excellent properties for separating bacteria and particles. The modified membranes showed high fouling resistance and a higher protein recovery ratio compared to the pristine membrane. The developed membranes can be applied in biopharmaceutical production and removal of proteins, retro viruses, and bacteria.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Article
Engineering, Chemical
Vatsal Shah, Nicholaus Prasetya, Kang Li
Summary: The PVDF CCD membranes produced by the CCD method show higher pure water fluxes compared to conventional membrane manufacturing technology, but most are hydrophobic and prone to fouling. The PDA modification technique is used to improve hydrophilicity, but longer modification times lead to decreased permeability due to pore blockage. Shorter duration modification (2 hours) results in the best overall permeation performance in fouling studies.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Chemistry, Physical
Hengyang Mao, Kai Qiu, Shouyong Zhou, Jiaming Wang, Mengting Li, Shuo Shi, Meisheng Li, Ailian Xue, Yijiang Zhao, Qi Zhang, Zhentao Wu
Summary: This study developed a method to fabricate superhydrophilic and underwater superoleophobic membranes for efficient water recovery from oil-water mixtures. The membranes exhibited excellent underwater superoleophobicity and were proven to effectively treat various oil-water mixtures.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Engineering, Chemical
Tongrong Wu, Farhad Moghadam, Kang Li
Summary: In this study, nano-scale pores were created on graphene oxide nanosheets through mild chemical etching to improve water permeance and dye rejection performance in porous hollow fiber membranes.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Chemistry, Physical
Mengting Jiang, Hengyang Mao, Shouyong Zhou, Shuo Shi, Meisheng Li, Ailian Xue, Yijiang Zhao, Qi Zhang, Zhentao Wu
Summary: This study developed a nano-attapulgite-based alignment technique by introducing polystyrene sulfonate sodium to promote the dispersion and stability of attapulgite. The results showed that the stability of the suspension played a decisive role in the alignment effect of attapulgite.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Engineering, Environmental
Hao Peng, Andrijana Minic, Kornkamol Banjerdteerakul, Kang Li
Summary: A COF-300/PVDF composite was developed as a high-performance adsorbent for PAHs removal, showing superior adsorption capacity, kinetics, and removal efficiency compared to COF-300 powders. It holds great potential for practical applications in PAHs removal.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Rajan Arjan Kalyan Hirani, Hong Wu, Abdul Hannan Asif, Nasir Rafique, Lei Shi, Shu Zhang, Zhentao Wu, Lai -Chang Zhang, Shaobin Wang, Yu Yin, Martin Saunders, Hongqi Sun
Summary: Membrane separation and sulfate radicals-based advanced oxidation processes (SR-AOPs) can be combined to efficiently remove organic pollutants. Immobilizing metal oxide catalysts on ceramic membranes can enhance membrane separation technology by enabling catalytic oxidation without the need for recovering suspended catalysts. Co3O4 ceramic catalytic membranes with different Co loadings were successfully fabricated and demonstrated uniform distribution of Co3O4 nanoparticles for catalytic oxidation of 4-hydroxybenzoic acid (HBA). Mechanistic studies identified both SO4 center dot- and (OH)-O-center dot as reactive radicals, with SO(4)(center dot-) playing the dominant role in the catalytic process.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Engineering, Chemical
Hao Peng, Vatsal Shah, Kang Li
Summary: Phase inversion plays a vital role in membrane technology for economic production of polymeric membrane and energy-saving wastewater treatment. However, existing phase inversion membranes often have low permeance, limiting their efficiency in separation processes.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Engineering, Chemical
Kornkamol Banjerdteerakul, Farhad Moghadam, Hao Peng, Kang Li
Summary: For the first time, a new approach was proposed to prepare porous hollow fiber (HF) yttria-stabilized zirconia (YSZ) substrates with small-diameter (660-790 μm, outer diameter (OD)) by stretching the nascent HF using gravitational force. Using a delayed phase inversion, a plurality of radial micro-channels opening from the interior surface of HFs can be realized. The resultant HF substrates show promising permeation characteristics and good fracture strength, and small-diameter HF substrates with higher surface curvature ensured the fabrication of porous GO (PGO) membranes with better dye separation performance.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Engineering, Chemical
Kornkamol Banjerdteerakul, Hao Peng, Kang Li
Summary: Nanofiltration is an effective method for removing emerging pharmaceuticals from waste-water to improve water quality and mitigate environmental impacts. However, the low separation efficiency of current nanofiltration membranes has hindered their development. In this study, a thin film composite membrane was prepared by stacking covalent organic framework (COF) nanosheets on a ceramic hollow fibre, showing high rejection for environmentally persistent pharmaceuticals. The COF-based nanofiltration membranes have a small footprint and can be easily integrated into existing water treatment systems, making them a promising option for mitigating the environmental impacts of emerging pharmaceuticals in wastewater.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Engineering, Chemical
Hengyang Mao, Peng Xu, Shouyong Zhou, Zhaoru Fan, Ailian Xue, Meisheng Li, Yijiang Zhao, Aiqin Wang, Zhentao Wu, Yiqun Fan
Summary: A facile approach is reported to produce nanofiber membranes with oriented channels, narrow pore size, and low tortuosity. Compared with unordered membranes, ordered membranes have reduced average pore size and increased water permeance. Moreover, the stationary flux of ordered membranes and the retention of oil-in-water emulsion have also increased.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Engineering, Chemical
Kornkamol Banjerdteerakul, Hao Peng, Kang Li
Summary: By employing an in-situ growth method, we successfully prepared COF-LZU1 and COF-300 membranes for the separation of polar/non-polar solvent mixtures. These composite membranes, consisting of a defect-free COF layer on a ceramic hollow fiber substrate, exhibited high solvent fluxes and achieved high separation factors for various azeotropic mixtures. Our study demonstrated the technical feasibility of using COF-based membranes for the separation of azeotropic solvent mixtures.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Engineering, Chemical
Hao Peng, Kang Li
Summary: In this study, a novel approach combining non-solvent-induced phase separation (NIPS) with crystallisation and diffusion (CCD) technique, called NIPS-CCD, was proposed to enhance the permeation of polyethersulfone (PES) ultrafiltration membrane. The NIPS-CCD method showed a 50-fold increase in water permeation to 771 LMH bar-1 with pore size of 6-7 nm. This approach can be easily adapted for other high-performance membrane materials, making it a promising strategy for improving membrane permeation properties.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Engineering, Chemical
Kornkamol Banjerdteerakul, Hao Peng, Kang Li
Summary: Covalent organic frameworks (COFs) have shown potential as membrane materials for water purification and organic solvent nanofiltration due to their adjustable pore size and ease of functionalisation. However, current COF membranes are limited in their mechanical stability and structural integrity when applied on flexible polymeric substrates. In this study, COF-LZU1 membranes were fabricated on pre-designed ceramic hollow fibres using direct interfacial polymerisation, resulting in highly crystalline and defect-free COF layers. The membranes exhibited high pure water permeance and rejection rates for dyes, highlighting their potential for enhanced process intensification.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Review
Biochemistry & Molecular Biology
Zhicheng Zhang, Wanglin Zhou, Tianlei Wang, Zhenbin Gu, Yongfan Zhu, Zhengkun Liu, Zhentao Wu, Guangru Zhang, Wanqin Jin
Summary: Ion-conducting ceramic membranes have the potential to achieve absolute selectivity for specific gases at high temperatures, making them promising for chemical production. By combining reaction and separation processes into one unit, membrane reactors can reduce by-product formation and utilize thermal effects for efficient and sustainable production. This paper provides an overview of recent developments, principles, advantages, disadvantages, and challenges in dense ceramic catalytic membrane reactors.
Review
Green & Sustainable Science & Technology
Mahesan Naidu Subramaniam, Zhentao Wu, Pei Sean Goh, Shouyong Zhou
Summary: This review article focuses on the development of composite biochar-based photocatalysts (BBP) for wastewater treatment using agricultural and poultry waste-derived biochar (BC). The synthesis techniques and properties of BC and BBP are discussed in detail. The review also explores the role of BC in enhancing the performance of BBP and its synergistic effects on the degradation of different types of pollutants. Additionally, the challenges associated with the practical application of BBP are elaborated.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Chemistry, Applied
Qingyuan Zheng, Jack H. Williams, Scott Elgersma, Mick D. Mantle, Andrew J. Sederman, G. Leendert Bezemer, Constant M. Guedon, Lynn F. Gladden
Summary: In this study, a pilot-scale fixed-bed reactor compatible with NMR/MRI was developed for Fischer-Tropsch synthesis. Multiple magnetic resonance techniques were applied to quantitatively characterize different product species within catalyst pellets, providing valuable information for catalyst and reactor optimization.
Article
Chemistry, Applied
Lisa Ramisch, Sebastian Pfaff, Sabrina M. Gericke, Edvin Lundgren, Johan Zetterberg
Summary: We present a combination of optical operando techniques that allow simultaneous measurement of adsorbed species on catalyst surfaces, monitoring of surface oxide formation, and imaging of the gas phase above the catalyst surface. The experimental setup was validated by studying CO oxidation on Pd(100) at different pressures, revealing the effects of pressure on the heterogeneous catalytic reaction.
Article
Chemistry, Applied
Marta Paniagua, Gabriel Morales, Juan A. Melero, Daniel Garcia-Salgado
Summary: The influence of common impurities in levulinic acid on the catalytic performance of different acid catalysts for bio-jet fuel production was studied. It was found that furfural had the greatest detrimental effect on catalyst performance, while propyl-sulfonic acid-modified SBA-15 and sulfonic acid resin Amberlyst-70 showed good regeneration ability.
Article
Chemistry, Applied
Jesus Tapiador, Pedro Leo, Guillermo Calleja, Gisela Orcajo
Summary: This study presents a new MOF material, Zn-URJC-13, with acid and basic sites, permanent porosity, and high affinity to CO2 molecules. The Zn-URJC-13 catalyst exhibits efficient performance in CO2 cycloaddition reactions and can be reused multiple times.
Article
Chemistry, Applied
Dan Zhao, Vita A. Kondratenko, Dmitry E. Doronkin, Shanlei Han, Jan-Dierk Grunwaldt, Uwe Rodemerck, David Linke, Evgenii V. Kondratenko
Summary: This study demonstrates the potential of cheap and commercially available Zr or Ti-based supports and ZnO to serve as active and selective catalysts for propane dehydrogenation (PDH). The catalytically active species formed in situ under PDH conditions consist of isolated ZnOx. ZnOx on the surface of LaZrOx shows the highest rate of propene formation.
Article
Chemistry, Applied
Hanbyeol Kim, Jung Rae Kim, Young-Kwon Park, Jeong-Myeong Ha, Jungho Jae
Summary: In this study, metal phosphates were used as catalysts for biomass conversion to produce sustainable aromatics through DielsAlder cycloaddition reactions. The effects of synthesis method, activation method, and P/Ti molar ratio on the structure and acid properties of titanium phosphate catalysts were systematically studied. The mesoporous titanium phosphate catalyst synthesized by hydrothermal method at 180℃ for 12 h followed by ethanol refluxing at 60℃ for 24 h at a molar P/Ti ratio of 1 showed the highest surface area and acid site density.
Article
Chemistry, Applied
Yasin Khani, Sumin Pyo, Kwang-Eun Jeong, Chul-Ung Kim, Moonis Ali Khan, Byong-Hun Jeon, Kun-Yi Andrew Lin, Siyoung Q. Choi, Young-Kwon Park
Summary: A protonated form of Zeolite Socony Mobil-5 (H-ZSM-5) catalyst was synthesized through a hydrothermal method using different sources of silica. The effect of loading the catalyst with yttrium, samarium, and gadolinium on the acidic properties was investigated. Among the metal-loaded catalysts, the Sm/LHZ catalyst showed the best performance in the methanol to propylene conversion due to its high amount of weak and intermediate acid sites, while the Gd-LHZ catalyst increased the selectivity towards ethane and propane.
Article
Chemistry, Applied
Michael Franc, Ivana Cisarova, Jan Vesely
Summary: The present study investigates an enantioselective cyclization of enals with imidazolone derivatives catalyzed by a combination of achiral Pd(0) complex and chiral secondary amine. Corresponding spirocyclic imidazolones were produced in high yields with moderate diastereoselectivity and excellent enantioselectivity. The developed co-operative catalytic methodology provides a highly substituted spirocyclic scaffold with four stereogenic centers under mild conditions.
Article
Chemistry, Applied
Mauro Alvarez, Jennifer Cueto, David P. Serrano, Pablo Marin, Salvador Ordonez
Summary: This study focuses on improving the formulation and preparation methods of catalysts for the production of dimethyl carbonate. By using suitable catalyst preparation methods and copper salt precursors, the researchers successfully produced catalysts with optimal performance for dimethyl carbonate formation.
Article
Chemistry, Applied
Claudia J. Keijzer, Luc C. J. Smulders, Dennie Wezendonk, Jan Willem de Rijk, Petra E. de Jongh
Summary: This study investigates the catalytic behavior of alpha-alumina supported silver catalysts in the presence of chloride. It is found that the particle size of silver can affect the selectivity of the catalyst, but different strategies lead to different results. In this size range, the selectivity of ethylene oxide is correlated to the Ag : Al2O3 surface ratio.
Article
Chemistry, Applied
Takeshi Aihara, Wataru Aoki, Michikazu Hara, Keigo Kamata
Summary: The development of acid-base bifunctional catalysts is important for promoting specific chemical transformations. In this study, Ti-based perovskite oxides were synthesized and used as catalysts for two C-C bond-forming reactions (cyanosilylation and Knoevenagel condensation). The highly pure SrTiO3 nanoparticles with a high specific surface area exhibited the highest catalytic performance, and could be easily recovered and reused.
Article
Chemistry, Applied
Olga Gorlova, Petra Pribylova, Eliska Vyskocilova, Katerina Peroutkova, Jan Kohout, Iva Paterova
Summary: This study investigates the Baeyer-Villiger oxidation of beta-cyclocitral using tin-modified mixed oxides as catalysts. The optimal reaction conditions and the effects of various factors on the reaction course and selectivity were determined. The results show that tin-modified mixed oxides exhibit high activity and selectivity in the oxidation reaction.
Article
Chemistry, Applied
M. I. Avila, M. M. Alonso-Doncel, L. Briones, G. Gomez-Pozuelo, J. M. Escola, D. P. Serrano, A. Peral, J. A. Botas
Summary: The catalytic fast pyrolysis of lignin using ion-exchanged zeolite catalysts showed significant improvements in bio-oil quality and the production of aromatic hydrocarbons and oxygenated compounds.
Article
Chemistry, Applied
Enrico Catizzone, Giorgia Ferrarelli, Paolo Bruno, Girolamo Giordano, Massimo Migliori
Summary: The acid-catalysed alcohol conversion reaction is a promising route for de-fossilization strategies. Research on pure alcohol conversion and simultaneous dehydration of mixed alcohols have shown different product compositions, with the type and distribution of acid sites affecting the reaction mechanism.
Article
Chemistry, Applied
Alireza Ranjbari, Juho Kim, Jihee Yu, Jiyun Kim, Mireu Park, Nayoung Kim, Kristof Demeestere, Philippe M. Heynderickx
Summary: This study investigated a novel kinetic model for the adsorption and photocatalytic degradation of methyl orange using commercial ZnO and reduced ZnO photocatalysts. The results provided new insights into the interaction of catalysts with molecules of different charges and compared with a previous study on methylene blue. The presence of oxygen vacancies in ZnO and their effects on adsorption and photocatalytic degradation were analyzed, and the photocatalytic degradation rate of reduced ZnO was found to increase significantly.
