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An overview of reforming technologies and the effect of parameters on the catalytic performance of mesoporous silica/alumina supported nickel catalysts for syngas production by methane dry reforming

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Recent Innovations in chemical engineering 2020年第4期13卷 303-322页

作者： Saad, M.A. Abdurahman, N.H. Yunus, Rosli Mohd Kamil, Mohammed Awad, Omar I. Faculty of Chemical and Process Engineering Technology University Malaysia Pahang Kuantan GambangPahang26300 Malaysia Department of Mechanical and Nuclear Engineering University of Sharjah Sharjah27272 United Arab Emirates State Key Laboratory of Automotive Safety and Energy of Tsinghua University Haidian Beijing China

Synthetic gas-a combination of (H2) and (CO)-is an important chemical inter mediate for the production of liquid hydrocarbon, olefin, gasoline, and other valuable chemicals. Several reforming methods that use steam, carbon dioxide, and oxygen in the presence of various catalytic systems have been extensively investigated, and this paper reviews the recent research on the state-of-the-art of reforming technologies and the effect of parameters on the catalytic activity of mesoporous silica/alumina supported nickel catalysts for syngas production by methane dry reforming. First, we provide an overview of reforming technologies, including methane dry reforming, steam methane reforming, partial oxidation of CH4, and auto thermal reforming of CH4. Then, we review the literature on dry reforming catalysts. Next, we describe recent findings on the effect of parameters on the catalytic activity of mesoporous silica/alumina supported nickel catalysts for syngas production. Finally, we make proposals for future research. This study can help achieve a better understanding of the reforming technologies and the effects of parameters on catalytic performance for syngas production, thus contributing to the development of green technologies. © 2020 Bentham Science Publishers.

关键词： Alumina

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Impacts of Surface Perturbations on Coalescence of Oil Drops in Aqueous Surfactant Solutions

SSRN

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SSRN 2023年

作者： Javadi, Aliyar Allahyari, Alireza Barzegarsattari, Farzane Rasaei, Mohammadreza Eftekhardadkhah, Mona Miller, Reinhard Eckert, Kerstin Institute of Fluid Dynamics Helmholtz-Zentrum Dresden-Rossendorf Bautzner Landstrasse 400 Dresden01328 Germany Chemical Engineering Department College of Engineering University of Tehran Iran Faculty of Technology Art and Design Oslo Metropolitan University Oslo Norway Institute for Condensed Matter Physics Technical University Darmstadt Hochschulstraße 8 DarmstadtD-64289 Germany Institute of Process Engineering and Environmental Technology TU Dresden Dresden01062 Germany

Coalescence of droplets is one of the most important steps in many multiphase processes, including emulsion formation and destabilization phenomena. Several parameters influence this process, including viscosity, temperature, drop size, interfacial properties, pH, and salinity. The approach velocity during the collision of two droplets is also a crucial factor in coalescence, which is not well-investigated due to the lack of suitable experimental instruments, protocols, and data analysis. In this work, we have introduced a new experimental protocol to study the impacts of interfacial area perturbations on the drop coalescence process, which indeed combines hydrodynamic and surface properties effects, dominated by "drops approach velocity" and "dynamics of the adsorbed layer." For this purpose, a capillary pressure based Oscillating Drop and Bubble (ODBA) setup is combined with a Profile Analysis Tensiometry (PAT), which can provide the approach process of drops via a drop oscillation protocol at different frequencies and amplitude, towards the coalescence process within a certain contact time. Coalescence of toluene droplets as a model oil is investigated in a continuous aqueous phase containing the nonionic surfactant Tween 80. It is observed that the coalescence time is decreased slightly (by about 6 to 20%) by drop oscillations at low frequencies of 0.05 and 0.1 Hz, while it increases significantly (by about 65 to 380%) for higher frequencies (1 to 10 Hz). The probable mechanisms include complex hydrodynamics of thin liquid film drainage, influenced by film deformation and Marangoni convection during re-distribution of the surfactant adsorbed layer, and re-organization of the adsorbed components. © 2023, The Authors. All rights reserved.

关键词： Capillarity

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Study of the properties and biodegradability of the native and plasticized corn flour-filled low density polyethylene composites for food packaging applications

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Materials Today: Proceedings 2021年 36卷 67-73页

作者： Samira Sahi Hocine Djidjelli Amar Boukerrou Laboratory Valuation of Fossil Fuels Department of Chemical Engineering National Polytechnic School of Algiers Algeria Laboratory of Advanced Polymer Materials Department of Process Engineering Faculty of Technology University A. Mira of Bejaia Bejaia Algeria

In this present study, several biocomposites based on low density polyethylene (LDPE) reinforced with plasticized corn flour (PCF) and native (unplasticized) corn flour (NCF) were prepared by reactive extrusion. To obtain compatible blends, a coupling agent PE-g-MA was added into the blend to reduce the interfacial tension existing between the polymer and filler. The results showed that the addition of PE-g-MA has improved morphology and gives a better interfacial adhesion between the filler and the matrix which is reflected in higher mechanical properties. The elongation at break was improved from 30.36, 22.64 and 19.09% for materials loaded with 10, 30 and 50% by PCF respectively to 45.89, 32.26 and 25.94% for the same formulations prepared with the coupling agent. The water absorption rate is reduced by 20% compared to non-compatibilized biocomposites. Moreover, the biodegradability of these biocomposites has been studied in a natural environment using a soil burial test for 180 days and the different results obtained are compared with those before burial. The results showed that the biocomposites prepared with the plasticized corn flour are more sensitive to biodegradation.

关键词： Biocomposites Low density polyethylene Thermoplastic corn flour Biodegradability Burial soil test

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Preparation and Characterization of Grease using Used Cooking Oil and Used Engine Oil 2

Preparation and Characterization of Grease using Used Cookin...

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2nd Joint International Conference on Emerging Computing technology and Sports, JICETS 2019

作者： Ong, Huei Ruey Iskandar, Wan Mohd Eqhwan Goh, Choon Phang Hong, Chi Shein Khan, Md. Maksudur Rahman Mohamed, Mohammad Khairul Anuar Faculty of Engineering and Technology DRB-HICOM University of Automotive Malaysia Peramu Jaya Industrial Area Pekan Pahang26607 Malaysia Faculty of Chemical and Process Engineering Technology Universiti Malaysia Pahang Lebuhraya Tun Razak Kuantan Pahang26300 Malaysia

Used engine oil (UEO) and used cooking oil (UCO) are treated as hazard to human health and the environment. A proper management of them are necessary to prevent its adverse impacts. This study is to examine the potential of UEO and UCO used as raw material in preparing grease. UEO and UCO has the potential in replacing the base fluid (mineral oil) and thickener precursor, respectively in conventional grease making. The thickener has been prepared by using calcium hydroxide and sodium hydroxide to react with UCO with the ratio of 1:2 (hydroxide: UCO) and denoted as calcium and sodium thickener, respectively. In grease making, different concentration of thickener (20, 30 and 40%) was used to react with UEO for 180 min at 160 - 180 -C. The formation of grease is confirmed by FTIR analysis, where a new peak was form in 1377 cm-1 - 1423 cm-1. Apart from that it was found that, 20% calcium thickener with 80% UEO grease and 40% sodium thickener with 60% UEO grease were comparable with commercial grease in term of dropping point and water resistance properties. © 2020 IOP Publishing Ltd. All rights reserved.

关键词： Lime

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Correction to: Remediation of soils on municipal rendering plant territories using Miscanthus × giganteus (Environmental Science and Pollution Research, (2022), 30, 9, (22305-22318), 10.1007/s11356-022-23724-z)

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Environmental Science and Pollution Research 2025年 1-1页

作者： Grzegórska, Anna Czaplicka, Natalia Antonkiewicz, Jacek Rybarczyk, Piotr Baran, Agnieszka Dobrzyński, Krzysztof Zabrocki, Dawid Rogala, Andrzej Department of Process Engineering and Chemical Technology Faculty of Chemistry Gdansk University of Technology Narutowicza 11/12 Gdansk80-233 Poland Department of Agricultural and Environmental Chemistry Faculty of Agriculture and Economics University of Agriculture in Krakow Av. Mickiewicza 21 Krakow31-120 Poland Rendering Plant in Gdańsk Zaklad Utylizacyjny Sp. z o.o. w Jabloniowa 55 Gdansk80-180 Poland Research and Development Dawid Zabrocki Jęczniki Wielkie 36 A Czluchow77-300 Poland

Acknowledgement This manuscript was prepared within the scope of the Baltic Phytoremediation (BAPR) project, co-financed by the Interreg South Baltic Program 2014–2020 under project number STHB.02.02.00-SE-0155/18, and published as part of an international project co-financed by the program of the Minister of Science and Higher Education entitled "PMW" in 2021-2022-Baltic Phytoremediation (BAPR) under contract no. 5247/SBP 2014-2020/2021/2. © The Author(s) 2025.

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Sonication-Assisted Activation of Empty Fruit Bunches to Produce Activated Carbon for Supercapacitor's Electrodes: Surface Chemistry and Morphology Characterization

SSRN

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SSRN 2023年

作者： Awoh, Egbe Terence Kiplagat, Joseph Kimutai, Stephen K. Mecha, Achisa C. Department of Mechanical Production and Energy Engineering School of Engineering Moi University P.O. Box 3900 Eldoret30100 Kenya Renewable Energy Environment Nanomaterials and Water Research Group Department of Chemical and Process Engineering Moi University P.O Box 3900 Eldoret30100 Kenya Department of Electrical and Electronic Engineering Faculty of Engineering and Technology University of Buea P.O Box 63 Buea Cameroon

Thermochemical treatment of empty fruit bunches (EFBs) is the fastest way of converting this agro-industrial waste into value. Two step carbonization and activation was used to convert the EFB to activated carbon, and further sonication and centrifugation was used to further reduce the particle size and increase the porosity. Hydrothermal carbonization was done at 225 to 275oC;at retention time of 1 to 3h. Activation was done at 800oC for 1h, using KOH at two different concentrations as activating agent. The FTIR of all samples shows activation with the increased of intensity of –C=C- stretching vibration, =C-H bending vibration and -C-H the bending vibration at 1615, 1505 and 1216cm-1 respectively;and the formation of new peaks at 714cm-1 associating to –C-H bending vibration and =CH2 wagging vibration common with activated carbon. The samples also experienced change in colorations with the degree coloration increases with the time and temperature of the reaction. The specific surface area was measured using BET and maximum surface of 1375.26m2/g was obtained when the biomass was carbonized at 275oC for 1h, and activated at 800oC using KOH at a concentration of 1:1 to the biochar. The corresponding pore diameter and volume at this optimum condition were 3.32nm and 0.73cm3/g respectively, given the material a high specific surface for electronic and ionic diffusions. © 2023, The Authors. All rights reserved.

关键词： chemical activation

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Adsorption of fluoride on a green adsorbent derived from wastepaper: Kinetic, isotherm and characterisation study

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Case Studies in chemical and Environmental engineering 2023年 8卷

作者： Hashim, Khalid S. Alsaffar, Abdul Kareem K. Alkizwini, Rasha Salah Ali, Abduljabar H. López-Maldonado, Eduardo Alberto Salman, Jasim M. Alenezi, SoltanMS. Salmon, Phil Abu Hasan, Hassimi Al-Ansari, Nadhir School of Civil Engineering and Built Environment Liverpool John Moores University Liverpool L3 3AF United Kingdom Faculty of Engineering University of Babylon Babylon Iraq Mechanical Engineering Al-Mustaqbal University Al-Hillah Iraq Faculty of Chemical Sciences and Engineering Autonomous University of Baja California CP Baja California Tijuana 22390 Mexico Department of Biology College of Science University of Babylon Al-Hillah Iraq Ministry of Municipality Kuwait Faculty of Science Liverpool John Moores University Liverpool L3 3AF United Kingdom Department of Chemical and Process Engineering Faculty of Engineering and Built Environment Universiti Kebangsaan Malaysia UKM Bangi Selangor 43600 Malaysia Research Centre for Sustainable Process Technology (CESPRO) Faculty of Engineering and Built Environment Universiti Kebangsaan Malaysia UKM Bangi Selangor 43600 Malaysia Department of Civil Environmental and Natural Resources Engineering Lulea University of Technology Sweden

The excessive concentration of fluoride (F−) in water represents a grave problem for several countries, especially those that depend on groundwater as a main source of drinking water. Therefore, many treatment methods... 详细信息

The excessive concentration of fluoride (F⁻) in water represents a grave problem for several countries, especially those that depend on groundwater as a main source of drinking water. Therefore, many treatment methods, such as chemical precipitation and membrane, were practised to remove F⁻ from water. However, the traditional methods suffer from many limitations, such as the high cost and the slowness. Hence, many studies have been directed towards developing novel and effective water defluoridation methods. In this context, the current study investigates the development of an eco-friendly adsorbent by extracting Ca, Al, and Fe from industrial by-products, precipitating them on sand particles, and using this new adsorbent to remove F⁻ from water. The removal experiments were commenced under different pH levels (3-10), contact times (0–240 minutes) and concentrations of F⁻ (7.5–37.5 mg/L). X-ray fluorescence (XRF), X-ray diffraction Investigator (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Spectroscopy (EDX) methods were used to characterise the green adsorbent. Adsorption isotherm and kinetic studies were also conducted to define the adsorption type. The results confirmed that the new adsorbent could remove as high as 86% of F⁻ at pH, contact time, agitation speed and adsorbent dose of 10, 180 minutes, 200 rpm and 15 mg/L, respectively. The characterisation studies prove the occurrence of the sorption process and the suitability of the morphology of the adsorbent for F⁻ removal. Adsorption kinetics follow better with a pseudo-first-order model that indicates the predominance of physisorption, which agrees with the FTIR results. The isotherm study indicated that Langmuir isotherm is more suitable for representing data with an R² value of 0.992, which means the adsorption of F⁻ occurs as monolayer adsorption

关键词： Adsorption Characterisation Fluoride Green

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Transfer Learning across Different chemical Domains: Virtual Screening of Organic Materials with Deep Learning Models Pretrained on Small Molecule and chemical Reaction Data

arXiv

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arXiv 2023年

作者： Zhang, Chengwei Zhai, Yushuang Gong, Ziyang Duan, Hongliang She, Yuan-Bin Yang, Yun-Fang Su, An State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology Key Laboratory of Green Chemistry-Synthesis Technology of Zhejiang Province College of Chemical Engineering Zhejiang University of Technology Zhejiang Hangzhou310014 China Key Laboratory of Pharmaceutical Engineering of Zhejiang Province National Engineering Research Center for Process Development of Active Pharmaceutical Ingredients Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals Zhejiang University of Technology Hangzhou310014 China Faculty of Applied Sciences Macao Polytechnic University 999078 China

Machine learning is becoming a preferred method for the virtual screening of organic materials due to its cost-effectiveness over traditional computationally demanding techniques. However, the scarcity of labeled data for organic materials poses a significant challenge for training advanced machine learning models. This study showcases the potential of utilizing databases of drug-like small molecules and chemical reactions to pretrain the BERT model, enhancing its performance in the virtual screening of organic materials. By fine-tuning the BERT models with data from five virtual screening tasks, the version pretrained with the USPTO-SMILES dataset achieved R2 scores exceeding 0.94 for three tasks and over 0.81 for two others. This performance surpasses that of models pretrained on the small molecule or organic materials databases and outperforms three traditional machine learning models trained directly on virtual screening data. The success of the USPTO-SMILES pretrained BERT model can be attributed to the diverse array of organic building blocks in the USPTO database, offering a broader exploration of the chemical space. The study further suggests that accessing a reaction database with a wider range of reactions than the USPTO could further enhance model performance. Overall, this research validates the feasibility of applying transfer learning across different chemical domains for the efficient virtual screening of organic materials. © 2023, CC BY-NC-SA.

关键词： chemical reactions

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A Comparative Study of Impact Fracture Toughness of Epoxidized Poly(1, 4 Cis-Isoprene) Compatibilized PLA Binary and Ternary Blends

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chemical engineering and technology 2025年第2期48卷

作者： Bijarimi, Mohd Ahmad, Sahrim Ode, La Mustaqeem, Mujahid Norazmi, M. Normaya, Erna Jaafar, Jamiluddin Faculty of Chemical and Process Engineering Technology Universiti Malaysia Pahang Al-Sultan Abdullah Lebuh Persiaran Tun Khalil Yaakob Pahang Kuantan26300 Malaysia School of Applied Physics Faculty of Science & Technology Universiti Kebangsaan Malaysia Selangor Bangi43600 Malaysia Department of Chemistry National Taiwan University No. 1 Section 4 Roosevelt Road Taipei10617 Taiwan Department of Chemistry Kulliyyah of Science International Islamic University Malaysia Jalan Sultan Haji Ahmad Shah Bandar Indera Mahkota Pahang Kuantan25200 Malaysia Faculty of Mechanical and Manufacturing Engineering Universiti Tun Hussein Onn Malaysia Parit Raja Johor Batu Pahat86400 Malaysia

Poly(lactic acid) (PLA) is a biodegradable polymer with limited application because of its intrinsic brittleness, low toughness, and low elongation at break. Melt blends were prepared by mixing a natural rubber (NR, poly(1,4-cis-isoprene) in the form of liquid NR (LNR), liquid-epoxidized NR (LENR), and polypropylene (PP) in the PLA matrix. Four blend systems were designed and prepared, i.e., PLA–PP, PLA–PP–LNR, and PLA–LNR or PLA–LENR. The composition of PP in the blend was fixed at 10 % PLAPP (90/10). Results showed that PLA–PP mixed with LNR improved impact and elongation at break. The binary blend of PLA–LNR (90/10) significantly enhanced impact strength and elongation at break properties. In contrast, the binary blends of PLA–LENR (90/10) showed a lower value of elongation at break (9.5 % vs. 37.3%) and impact strength (4.56 kJ m−2 vs. 6.44 kJ m−2). The melting temperature (Tm) and the glass transition temperature (Tg) were measured by differential scanning calorimetry, which recorded slight changes in the glass temperatures and melting temperatures. Scanning electron microscopy images of the tensile fracture of the PLA–LNR (90/10) blend showed the presence of large fibrils associated with the ductile failure related to neat PLA. Finally, the fracture toughness (KIC) of PLA–LNR (90/10) showed an increase of 39 % over neat PLA (2.94 MPa.m1/2 vs. 4.08 MPa.m1/2). © 2024 Wiley-VCH GmbH.

关键词： Fracture toughness

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Effect of spray drying parameters on the physicochemical properties and oxidative stability of oil from menhaden (Brevoortia spp.) and Asian swamp eel (Monopterus albus) oil extract microcapsules

Food Chemistry Advances

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Food Chemistry Advances 2023年 3卷

作者： Hashim, Nurmaryam Aini Mohd Norzi, Muhammad Fitri Azizi Mohd Arshad, Zatul Iffah Mohd Azman, Nurul Aini Abdul Mudalip, Siti Kholijah Faculty of Chemical and Process Engineering Technology Universiti Malaysia Pahang Lebuhraya Persiaran Tun Khalil Yaakob Pahang Gambang 26300 Malaysia Centre for Research in Advanced Fluid and Processes Universiti Malaysia Pahang Lebuhraya Persiaran Tun Khalil Yaakob Pahang Gambang 26300 Malaysia

This work investigated the effect of spray drying parameters on the physicochemical properties and oxidative stability of oil from menhaden (Brevoortia spp.) and Asian swamp eel (Monopterus albus) oil microcapsules. Different emulsion formulations (Maltodextrin - MD, Maltodextrin+Gum Arabic - MD+GA, and Maltodextrin+Starch - M+S), inlet air temperatures (180, 190, and 200 °C), and feed flow rates (280, 382, and 485 mL/h) were applied to microencapsulate Brevoortia spp. oil. The best operating parameters were then used to microencapsulate the Monopterus albus oil. The moisture content, MC (%), peroxide value, PV (mEq/kg), free fatty acid, FFA (%), acid value, AV (mg KOH/g) and the morphology of the microcapsules were then evaluated. The Brevoortia spp. oil microcapsules produced with the Maltodextrin+Gum Arabic emulsion formulation, inlet air temperature of 200 °C, and feed flow rate of 280 mL/h showed the lowest moisture content, peroxide value, free fatty acid, and acid value of 9.145%, 3.293 mEq/kg, 4.891%, and 2.981 mg KOH/g, respectively. Using similar parameters, the microencapsulation of the Monopterus albus oil extract recorded a moisture content, peroxide value, free fatty acid, and acid value of 8.432%, 2.713 mEq/kg, 4.911%, and 2.871 mg KOH/g, respectively. In conclusion, improved physicochemical properties and oxidative stability of Monopterus albus oil extract microcapsules were achieved using the Maltodextrin+Gum Arabic emulsion formulation and spray drying at a high air inlet temperature of 200 °C and a low feed flow rate of 280 mL/h. © 2023 The Author(s)

关键词： Brevoortia spp Feed flow rate Fish oil Inlet air temperature Monopterus albus Oxidative stability Spray drying

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