Korean Journal of Chemical Engineering最新文献

{"title":"Impact of Magnetized Modified Water on the Dissolution Behavior of Raw Gypsum","authors":"Liqin Li,&nbsp;Ruiduo Li,&nbsp;Xin Zhao,&nbsp;Yubin Wang,&nbsp;Dashi Lei","doi":"10.1007/s11814-024-00293-0","DOIUrl":"10.1007/s11814-024-00293-0","url":null,"abstract":"<div><p>Magnetized modified water could significantly affect the dissolution and crystallization process of raw gypsum, while the mechanism was still unclear. In this work, the enhancement mechanism of raw gypsum solubility by magnetized modified water was first systemically investigated. Viscosity, surface tension analysis, scanning electron microscope (SEM), Fourier transform infrared (FT-IR) spectroscopy, and X-ray photoelectron spectroscopy (XPS) exhibited that magnetization treatment could significantly change the properties of distilled water and the microstructure of raw gypsum. Magnetization treatment reduced the surface tension and viscosity of distilled water and increased the proportion of hydrophilic hydroxyl group in distilled water, which promoted the molecular affinity between water molecules and raw gypsum, resulting in an enhanced affinity between Ca²⁺ ions and water molecules at the active site of raw gypsum surface. In addition, an applied magnetic field leaded to a decreased crystallinity and an increase in the (020) interplanar spacing of raw gypsum, which was conducive to contact with water, and finally enhanced the solubility of raw gypsum by 65.50%. This study can provide a theoretical basis for the use of magnetized modified water to regulate the dissolution behavior of raw gypsum.</p></div>","PeriodicalId":684,"journal":{"name":"Korean Journal of Chemical Engineering","volume":"42 2","pages":"403 - 413"},"PeriodicalIF":2.9,"publicationDate":"2024-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994393","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synergetic Hydrogen and Methane Productions from Anaerobic Digestion of Selected Rural-Farming Plant and Animal-Based Biomass Wastes","authors":"Jayen Aris Kriswantoro,&nbsp;Chiung-Hao Tseng,&nbsp;Flaminia Fois,&nbsp;Chen-Yeon Chu,&nbsp;Eros Manzo,&nbsp;Francesco Petracchini","doi":"10.1007/s11814-024-00294-z","DOIUrl":"10.1007/s11814-024-00294-z","url":null,"abstract":"<div><p>The implementation of the circular economy and green energy transition for the treatment of agricultural waste into bioenergy presents greater challenges in mountainous and rural areas. The integration of rural-farming plant (tomato plant residue, TR; and cacao pod husk, CPH) and animal-based biomass waste (deer manure, M) with an anaerobic digestion (AD) plant as a substrate has the potential to produce biohydrogen and biomethane as a source of bioenergy in rural farming areas. This study aims to investigate the potential of these feedstocks, including mono- and co-digestion of M and TR in single-stage AD. The co-digestion of M and TR significantly enhanced the biogas and methane production performances, with an increase of 27.5–173.2% compared to mono-digestion. The ratio of M to TR affects the total solid (TS) load in the initial AD process. A TS greater than 3% was found to be more favorable for methane production. This co-digestion method avoids the accumulation of volatile fatty acids (VFAs) in the mixture which prevents inhibition of methane production. The effect of initial substrate and inoculum concentration in two-stage AD using dried CPH powder was also explored in this study. The acidic thermochemical pretreatment of CPH has been demonstrated to significantly enhance biohydrogen production. The optimal biohydrogen and methane production using CPH in two-stage anaerobic digestion was achieved by a substrate concentration of 12 g Volatile Solid_added/L and an inoculum concentration of 10% v/v (volume/volume). According to this study, all residue generated by the agricultural sector has the potential to be utilized with greater added value within the agricultural industry to support the green energy transition in rural farming areas.</p></div>","PeriodicalId":684,"journal":{"name":"Korean Journal of Chemical Engineering","volume":"42 4","pages":"775 - 790"},"PeriodicalIF":2.9,"publicationDate":"2024-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143706994","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Highly Electrocatalytic Activity of Micro and Nanocomposite Phase Engineering of MoO3−x@K3PW12O40 Decorated on Graphite Felt for High-Performance VRFB","authors":"Nadra Nasir,&nbsp;Kue-Ho Kim,&nbsp;Ha-Na Jang,&nbsp;Hyo-Jin Ahn","doi":"10.1007/s11814-024-00292-1","DOIUrl":"10.1007/s11814-024-00292-1","url":null,"abstract":"<div><p>The catalytic activity of metal cations exchanged with heteropoly acids (HPA) and the selectivity towards precursor composite materials can be tailored by adjusting the reaction mechanism. A structural defect engineering strategy was developed for the metallic phase of O-MoS₂, doped with a Keggin-type HPA to serve as a double gyroid layer (O-MoS₂@HPA). This was achieved through thermal oxidation treatment to enable a high surface area by depositing abundant catalytically active sites on the graphite felt. Optimization strategies involving MoO_3−<i>x</i> (MoO_3−<i>x</i>@K₃PW₁₂O₄₀) species have been crafted, anchoring active sites in a spherical nanomorphology through the self-assembly of acid. This development introduces a new approach for enhancing electrocatalysts, aiming for superior performance in VRFB. The electrochemical results show remarkable enhancement in electrocatalytic behavior with abundant heteroatom active sites, promoting oxidation at a high current density of 150 mA/cm², achieving an outstanding 84.62% high energy efficiency. This result is 14% higher than pristine graphite felt and exhibits extraordinary stability after 1350 cycles, overcoming the sluggish kinetic mechanism that limits redox active materials. This study creates new avenues for the design of hybrid micro/nanostructured materials on cathodes and anodes to achieve excellent performance as electrocatalysts for VRFB.</p></div>","PeriodicalId":684,"journal":{"name":"Korean Journal of Chemical Engineering","volume":"41 12","pages":"3179 - 3190"},"PeriodicalIF":2.9,"publicationDate":"2024-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142453037","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"How to Apply Raman Spectroscopy for Single Crystals and Thin Films of Organic–Inorganic Lead Halide Perovskite","authors":"Hyeon Jun Jeong,&nbsp;Hyunjung Shin","doi":"10.1007/s11814-024-00296-x","DOIUrl":"10.1007/s11814-024-00296-x","url":null,"abstract":"<div><p>Organic–inorganic lead halide perovskite (OLHP) semiconductors have garnered significant attention for their versatile applications in solar cells, LEDs, photodetectors, and transistors, owing to their remarkable optoelectronic properties and facile solution-based fabrication. Understanding the fundamental physicochemical properties of OLHPs remains challenging due to their soft lattice structures and dynamic structural vibrations with molecular motions. It often results in extraordinary charge transporting and energy transfer, which can be found in many devices. Raman spectroscopy emerges as a vital tool for probing these structural properties due to its high resolution and non-destructive nature. This paper reviews Raman spectral analysis for OLHPs, highlighting the complexities in interpreting low and high-frequency vibrational modes associated with PbX₆ octahedra and organic/molecular cations, respectively. We identify the challenges posed by laser-induced degradation and phase transitions during resonance Raman measurements. Our study proposes improved Raman measurement strategies, emphasizing non-resonance conditions and careful selection of laser wavelengths to mitigate artifacts. These strategies aim to enhance the accuracy of Raman spectra and deepen our understanding of the structural dynamics of OLHPs, which is crucial for advancing their application in next-generation optoelectronic devices.</p></div>","PeriodicalId":684,"journal":{"name":"Korean Journal of Chemical Engineering","volume":"41 14","pages":"3693 - 3701"},"PeriodicalIF":2.9,"publicationDate":"2024-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142798344","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Polyethyleneimine-Assisted SnO2 Electron Transport Layers for Roll-to-Roll Processed Perovskite Solar Cells","authors":"Geon Yeong Park,&nbsp;Jeongin Lim,&nbsp;Hyuntae Choi,&nbsp;Min Kim,&nbsp;Seulki Song,&nbsp;Dong Seok Ham","doi":"10.1007/s11814-024-00298-9","DOIUrl":"10.1007/s11814-024-00298-9","url":null,"abstract":"<div><p>Perovskite solar cells (PSCs) have garnered significant attention as promising candidates for the next generation of solar energy-harvesting devices. Despite their impressive efficiency potential, conventional fabrication methods, such as spin-coating, have limitations in terms of scalability for large-scale production. To address this challenge, the roll-to-roll (R2R) process has emerged as a commendable approach for the cost-effective and high-throughput manufacturing of PSCs. In this research article, we propose electron transport layer (ETL) engineering as a strategy to enhance the performance of R2R-processed PSCs. Specifically, we introduce polyethyleneimine (PEI) as a dispersant within the ETL and systematically optimize the PEI concentration to achieve improved uniformity and bandgap control. Through systematic experimentation, we demonstrate that the optimal PEI concentration (1 wt%) leads to a perovskite solar cell with a power conversion efficiency (PCE) of 15.8%. In addition, the solar cell device with the optimized ETL recorded a stable efficiency of 15.8% even in MPPT measurement.</p></div>","PeriodicalId":684,"journal":{"name":"Korean Journal of Chemical Engineering","volume":"41 14","pages":"3805 - 3812"},"PeriodicalIF":2.9,"publicationDate":"2024-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142798296","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Preparation of N-Enriched GO Adsorbents and Their Properties for Selective CO2 Capture","authors":"Yasamin Hosseini,&nbsp;Mahsa Najafi,&nbsp;Soodabeh Khalili,&nbsp;Mohsen Jahanshahi,&nbsp;Majid Peyravi","doi":"10.1007/s11814-024-00274-3","DOIUrl":"10.1007/s11814-024-00274-3","url":null,"abstract":"<div><p>In this work, GO adsorbents were fabricated based on the Hummers’ procedure and further chemically modified with 3-aminopropyl-triethoxysilane (APTS) as primary amino-silane, piperazine (PIP) as a secondary cyclic diamine, and ethanolamine (EA) as primary amine to enhance their CO₂ adsorption/separation properties. The adsorption characteristics of the amine-functionalized adsorbents were assessed at different temperatures and pressures. It was found that the aforementioned functionalities highly influence the physical–chemical and textural properties of the prepared adsorbents. The experimental isotherm data were analyzed by the Sips isotherm equation to describe the CO₂ adsorption isotherm. GO/APTS exhibited the maximum CO₂ adsorption capacity of 43.114 mmol/g, based on the Sips isotherm model at 298 K. Accordingly, GO/APTS showed ideal adsorbed solution theory selectivity (CO₂/N₂) of 33.7. The adsorption mechanism of GO and amine-modified GO adsorbents can be described a physico-chemical adsorption, driven by the cooperation between nitrogen functional groups and the filling of micropores. It was found that the CO₂ adsorption capacity for GO/APTS was 2.3 times higher than the sorption capacity for unmodified GO, confirming the contributions of electron-donor amine and methyl groups, the high molecular weight of APTS, and the high surface area of GO/APTS in enhancing CO₂adsorption capacity.</p></div>","PeriodicalId":684,"journal":{"name":"Korean Journal of Chemical Engineering","volume":"42 2","pages":"291 - 306"},"PeriodicalIF":2.9,"publicationDate":"2024-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994339","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Highly Dispersed Ligand-Free SnO2 for Inverted Perovskite Solar Cells","authors":"Hee Jung Kim,&nbsp;Geon Woo Yoon,&nbsp;Bonghyun Jo,&nbsp;Hyun Suk Jung","doi":"10.1007/s11814-024-00289-w","DOIUrl":"10.1007/s11814-024-00289-w","url":null,"abstract":"<div><p>Ligand-free SnO₂ nanoparticles were synthesized via a non-hydrolytic route using benzyl alcohol, resulting in well-crystallized SnO₂ with a size below 20 nm. The dispersibility of these SnO₂ nanoparticles was optimized using Hansen solubility parameters, achieving stable dispersion in a mixed solvent composed of isopropanol and chlorobenzene in a 2:8 volume ratio. The SnO₂ layer was deposited on the perovskite layer via spin-coating, forming a uniform and compact layer with efficient charge transfer properties. Photovoltaic performance analysis revealed that p-i-n perovskite solar cells with SnO₂ electron transport layer achieved a power conversion efficiency of 13.4%, compared to 15.8% for perovskite solar cells with PCBM/ZnO electron transport layer. The lower power conversion efficiency with SnO₂ electron transport layer is attributed to decreased open-circuit voltage (<i>V</i>_oc) due to surface defects. Despite this, the direct deposition of ligand-free SnO₂ thin film using a solution process is significant, and ongoing research aims to further enhance performance.</p></div>","PeriodicalId":684,"journal":{"name":"Korean Journal of Chemical Engineering","volume":"41 14","pages":"3799 - 3804"},"PeriodicalIF":2.9,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142798502","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental Study of the Conversion of Polyethylene and Polypropylene to Non-Condensable Gases Using a Lab-Scale Bubble Column Reactor with Molten Metal Catalysis","authors":"Eunji Lee,&nbsp;Won Yang,&nbsp;Uendo Lee,&nbsp;Yongwoon Lee,&nbsp;Youngjae Lee","doi":"10.1007/s11814-024-00281-4","DOIUrl":"10.1007/s11814-024-00281-4","url":null,"abstract":"<div><p>Sustainable solutions for recycling waste plastics are necessary to replace conventional processing techniques. Plastic pyrolysis is a promising technology for converting waste plastic into useful chemicals. This study aimed to produce hydrogen (H₂) via plastic pyrolysis using a molten metal catalyst. The characteristics of plastic conversion to non-condensable gas under various operating conditions, such as the number of reactors, reaction temperature, and type of molten metal catalyst used, were investigated. Nitrogen (N₂) was introduced into a molten metal bubble column reactor containing a metal catalyst, and plastic was then uniformly mixed inside the catalyst through the formed rotating flow. Polyethylene and polypropylene were pyrolyzed at 700–900 ℃. In the single reactor, the fraction of H₂ was similar to that reported in previous studies; however, the fraction of light hydrocarbons increased. As the number of reactors increased in the multi-stage reactor, the fraction of CH₄ increased to 58%. At elevated reactor temperatures, the fraction of H₂ increased to 40% as the decomposition of light hydrocarbons increased. The dominant influence on H₂ production was C₂H₄ decomposition. The present study derived the optimal operating conditions for increasing H₂ production during plastic pyrolysis with molten metal catalysts.</p></div>","PeriodicalId":684,"journal":{"name":"Korean Journal of Chemical Engineering","volume":"42 4","pages":"745 - 756"},"PeriodicalIF":2.9,"publicationDate":"2024-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143707008","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Methane Pyrolysis Using Metal Beads for CO2-Free Turquoise Hydrogen Production","authors":"Gayatri Udaysinh Ingale,&nbsp;Eunsol Go,&nbsp;Muzafar Abbas,&nbsp;Hyunki Kim,&nbsp;Tasmia Khalid,&nbsp;Youngjae Lee,&nbsp;Hyunmin Kwon,&nbsp;Whidong Kim,&nbsp;Uendo Lee","doi":"10.1007/s11814-024-00290-3","DOIUrl":"10.1007/s11814-024-00290-3","url":null,"abstract":"<div><p>The study investigates the catalytic effect of steel beads on methane pyrolysis within a tube reactor at atmospheric pressure. The SUJ2 steel beads serve a dual role as a catalyst and heat transfer material, maintaining the overall system temperature below 1000 °C during the pyrolysis reaction. The catalytic decomposition of methane using the metal beads was compared to that in a blank tube reactor, revealing the significant catalytic impact of the beads. Under optimal conditions, the highest average methane conversion of 77% was achieved at 900 °C with a flow rate of 2.5 standard cubic centimeters per minute (sccm). The metal beads demonstrated durability over extended operational hours and were evaluated for their recyclability and scale-up perspective. The high specific heat of the SUJ2 steel beads contributed to uniform temperature distribution, further improving the efficiency of the pyrolysis process. Successive pyrolysis cycles showed increased methane conversion, which was attributed to the formation of iron carbides. Catalyst regeneration through oxidative processes effectively restored and enhanced catalytic activity, leading to progressively higher methane conversions. This study highlights the practical viability of SUJ2 steel beads for methane pyrolysis, providing a cost-effective alternative to traditional catalysts and bed materials.</p></div>","PeriodicalId":684,"journal":{"name":"Korean Journal of Chemical Engineering","volume":"42 4","pages":"765 - 773"},"PeriodicalIF":2.9,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143706969","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Numerical Study on 1D Simulation Model for Determining Particle Size Change in a Circulating Fluidized Bed Boiler","authors":"Eunsol Go,&nbsp;Hyunmin Kwon,&nbsp;Byeongryeol Bang,&nbsp;Daecheol Song,&nbsp;Sungil Kim,&nbsp;Changwon Yang,&nbsp;Geunyong Park,&nbsp;Tongseop Kim,&nbsp;Uendo Lee","doi":"10.1007/s11814-024-00285-0","DOIUrl":"10.1007/s11814-024-00285-0","url":null,"abstract":"<div><p>New and renewable energy usage is expanding, but thermal power plants are still critical as a stable power source. For coal-fired power plants to play a role in responding to climate change until other technological alternatives are prepared, next-generation coal-fired power plants must be equipped with high-efficiency, low-emission (HELE) technology. In the existing HELE technology, low emission meant a reduction of pollutants such as NOx, SOx, and PM (particulate matter), but now greenhouse gases are also a reduction target. The existing thermal power plants can supply massive low-carbon power through fuel diversification with low-carbon fuels. From this perspective, a circulating fluidized bed (CFB) boiler represents an optimal solution, and the importance of numerical analysis techniques is increasing in using various fuels in CFB boilers. The particles in the CFB boiler demonstrate alterations in particle size as a consequence of cracking and abrasion resulting from particle-wall and particle-to-particle collisions. The re-designed particle size distribution (PSD) of intrinsically induced fuel fragmentation within a furnace differs from the initial fuel particle size. If the PSD change effect is obvious, the redefined PSD should be used for a numerical simulation of a CFB boiler. In this study, we investigated the effect of fuel fragmentation on the operation of a CFB boiler through 1D simulation. The fuel fragmentation factor is specified as a variable with a range of values. It has been demonstrated that the average particle size of the fuel introduced to the boiler can vary by more than 40%, depending on the degree of fragmentation of the fuel. Consequently, alterations in the PSD impact the transfer of heat and the temperature of the bed, which in turn affects combustion efficiency. These results show that accurate estimation of the solid size in the boiler is essential for the numerical simulation of a CFB boiler.</p></div>","PeriodicalId":684,"journal":{"name":"Korean Journal of Chemical Engineering","volume":"42 4","pages":"757 - 764"},"PeriodicalIF":2.9,"publicationDate":"2024-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143707077","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}