Article
Environmental Sciences
Wonjun Choi, Hyeonmin Jo, Jae-Wook Choi, Dong Jin Suh, Hyunjoo Lee, Changsoo Kim, Kwang Ho Kim, Kwan-Young Lee, Jeong-Myeong Ha
Summary: In this study, Ru-added transition metal catalysts were used for the mild hydrotreating of acid-rich biomass pyrolysis oil, leading to stabilization of the oil, reduction in acidity, and higher organic compound yields. Bimetallic catalysts showed good decarboxylation activity for the removal of carboxylic acids and were deemed suitable for feedstocks requiring suppression of organic reactant loss. The improved catalytic activity of Ru-added transition metals can be attributed to their high acid site densities and enhanced hydrogenation activities.
ENVIRONMENTAL POLLUTION
(2021)
Article
Chemistry, Analytical
Feng Zhang, Bing Wang, Feng Wang, Sai-Si Liu, Yun-Chang Fan, Pei-Gao Duan
Summary: In this study, crude bio-oil derived from peanut straw was separated into light oil (LO) and heavy oil (HO) using molecular distillation. The LO obtained showed different chemical component distribution depending on the distillation pressure. Hydrotreating of LO significantly increased the upgraded oil yield.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2023)
Article
Engineering, Environmental
Wei Liao, Xiong Zhang, Jinbao Chen, Shihong Zhang, Jingai Shao, Zeng Kuo, Haiping Yang, Hanping Chen
Summary: In this study, waste bio-oil was proposed as an additive to improve urea-based denitrification efficiency. The results showed that the addition of 5% bio-oil widened the denitrification temperature range, reduced the reduction temperature, and improved the denitrification efficiency.
Article
Energy & Fuels
Muhammad Shahzeb Khan, Yikai Min, Mohsen Broumand, Sean Yun, Zekai Hong, Murray J. Thomson
Summary: By employing thermo-catalytic reforming bio-oil (TCRBO) process, higher quality bio-oil with advantages in combustion performance, such as higher fuel heating value and lower emissions, was obtained. TCRBO demonstrated better atomization compared to FPBO, resulting in reduced fuel flow rate and lower PM emissions.
Article
Chemistry, Applied
M. Slezackova, A. Peller, J. Mikulec, M. Banic, J. Blasko, E. Hajekova
Summary: Inedible camelina oil (CSO) can be used as diesel components after hydrotreatment. Under suitable conditions, CSO with high unsaturation can be converted into alkanes, aromatics and higher olefins. The co-hydrotreatment with paraffinic solvents can achieve high triacylglyceride conversion into hydrocarbons.
Article
Chemistry, Physical
Herve Toulhoat
Summary: This paper discusses the importance of catalytic hydrogenation in upgrading aromatics into fuels and petrochemical bases, as well as the rim-edge model, the exceptional hydrogenation activities of NiMoS supported on NiSx, and the effects of doping with elements such as phosphorous, boron, and fluorine.
JOURNAL OF CATALYSIS
(2021)
Article
Engineering, Chemical
Xiaoyuechuan Ma, Shusheng Pang, Qixiang Xu
Summary: This study investigates the kinetics and characteristics of carbonaceous deposits formed during hydrotreating of bio-oil derived from fast pyrolysis of rice husk, using a commercial Ni-based catalyst. A mathematical model based on key chemical reactions and solved with experimentally obtained kinetic parameters is developed for better understanding and optimization of the catalytic upgrading process.
CHEMICAL ENGINEERING SCIENCE
(2021)
Article
Chemistry, Applied
Huamin Wang, Pimphan A. Meyer, Daniel M. Santosa, Cheng Zhu, Mariefel Olarte, Susanne B. Jones, Alan H. Zacher
Summary: Co-processing residue with stabilized bio-oil in a hydrotreater can convert a significant amount of residue to lighter products without affecting bio-oil conversion rate, potentially due to synergy between hydrotreating and hydrocracking reactions. Elimination of a separate hydrocracker and recycling of residue to the hydrotreating reactor can lead to a 6% reduction in conversion cost, with 57% of the cost reduction attributed to capital equipment elimination and 43% to lower operating costs.
Article
Chemistry, Physical
E. David
Summary: A new type of zeolite with secondary mesopores was prepared by treating commercial zeolite, which significantly increased the hydrocarbon yield in bio-oil.
APPLIED CATALYSIS A-GENERAL
(2021)
Article
Chemistry, Analytical
Yorinda Buyang, Suprapto Suprapto, Reva Edra Nugraha, Holilah Holilah, Hasliza Bahruji, Ridho Hantoro, Aishah Abdul Jalil, Titie Prapti Oetami, Didik Prasetyoko
Summary: Conversion of non-edible RTO into bio-oil by catalytic pyrolysis using dolomite as a catalyst, without prior calcination or treatment. Dolomite enhanced bio-oil yield and reduced char formation at higher pyrolysis temperatures. Dolomite also improved the composition and physical properties of bio-oil, including viscosity, calorific value, and density, and reduced the carboxylic acid content through esterification reaction.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2023)
Review
Environmental Sciences
Yi Wang, Abdolhamid Akbarzadeh, Li Chong, Jinyu Du, Nadeem Tahir, Mukesh Kumar Awasthi
Summary: This review summarizes recent findings on bio-oil production through catalytic pyrolysis using lignocellulosic biomass as feedstock. It explores and summarizes lignocellulosic biomass, structural components, and fundamentals of biomass catalytic pyrolysis. The current status of bio-oil yield and quality from catalytic fast pyrolysis is reviewed, and the potential effects of pyrolysis process parameters on bio-oil production are discussed. Techno-economic analysis and future prospects of catalytic pyrolysis for bio-oil production are also presented in this review.
Article
Engineering, Environmental
Zhongzheng Xu, Mingwei Zhao, Yiming Zhang, Pan Wang, Yining Wu, Lin Li, Xin Cui, Ning Sun, Caili Dai
Summary: Superhydrophobic nanomaterials inspired by the lotus effect can effectively solve the problem of high injection pressure and insufficient water injection in low permeability oilfields. A novel type of superhydrophobic nanoparticle (SHNP) modified by fluorinated long chains is successfully prepared, which has excellent core drag reduction effect and broad application potential in oilfield development.
CHEMICAL ENGINEERING JOURNAL
(2023)
Review
Biochemistry & Molecular Biology
Yanfan Yang, Xuan Xu, Haodong He, Dan Huo, Xiaoyun Li, Lin Dai, Chuanling Si
Summary: The depletion of oil resources and environmental problems caused by fossil energy usage have led to the search for alternative energy sources, with bio-oil being a promising option. However, bio-oil cannot be directly utilized due to its high proportion of oxygenated compounds with low calorific value and poor thermal stability. Catalytic hydrodeoxygenation (HDO), with various catalyst systems like noble/non-noble metal catalysts, porous organic polymer catalysts, and polar solvents, is an effective method to refine oxygenated compounds from bio-oil. This review discusses the HDO process, different catalytic materials, mechanisms, and future challenges and opportunities for bio-oil upgradation.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Materials Science, Paper & Wood
Yan Luo, Xuan Zhou, Hui Pu, Hongling Pan, Xiao Feng, Wenhai Ding, Chenfan Ding, Yiheng Dang
Summary: The study tested raw bio-oil with three types of commercial catalysts for hydrodeoxygenation, with different levels of HDO and organic phase product yields observed. Among the catalysts, HT-36 showed the best results, with improved yields and physio-chemical properties.
Article
Energy & Fuels
Zhe Xiong, Zhou Fang, Long Jiang, Hengda Han, Limo He, Kai Xu, Jun Xu, Sheng Su, Song Hu, Yi Wang, Jun Xiang
Summary: This study investigated the effects of initial bio-oil production conditions on the steam reforming of bio-oil. The results showed that the biomass particle size had a significant impact on the tar yield, while the bio-oil production temperature and oligomer content also influenced the tar yield to some extent. In addition, the biomass particle size affected the gas yields from steam reforming, while the content of organics in bio-oil played a significant role in determining the gas yields.
Article
Chemistry, Physical
Mihai Marinescu, Daniela Roxana Popovici, Dorin Bombos, Gabriel Vasilievici, Paul Rosca, Elena-Emilia Oprescu, Ion Bolocan
Summary: This study focuses on the hydrodeoxygenation/hydrocracking process of oxygenated compounds using a bifunctional catalyst containing copper, palladium, and ZSM-5. The conversion of methyl esters to hydrocarbons is influenced by temperature, with higher temperatures favoring cyclization and aromatization reactions. Overall, the CuPd/gamma-Al2O3-ZSM-5 catalyst plays a crucial role in achieving high yields of alkanes under specific conditions.
REACTION KINETICS MECHANISMS AND CATALYSIS
(2021)
Article
Chemistry, Multidisciplinary
Madalina Elena David, Rodica-Mariana Ion, Ramona Marina Grigorescu, Lorena Iancu, Alina Maria Holban, Adrian Ionut Nicoara, Elvira Alexandrescu, Raluca Somoghi, Mihaela Ganciarov, Gabriel Vasilievici, Anca Irina Gheboianu
Summary: Multi-walled carbon nanotubes (MWCNTs) were decorated with different types of nanoparticles (NPs) to obtain hybrid materials with improved antimicrobial activity, showing good antimicrobial properties in clinically relevant microbial strains. The presence of NPs on the surface of MWCNTs enhanced the nanocomposites' activity, with zinc oxide and silver nanoparticles improving the antimicrobial properties of the material.
Article
Chemistry, Multidisciplinary
Ciprian-Gabriel Chisega-Negrila, Aurel Diacon, Ioan Calinescu, Mircea Vinatoru, Daniela Berger, Cristian Matei, Gabriel Vasilievici
Summary: The copper nanoparticles on silica support are effective and low-cost catalysts for the dehydrogenation of n-butanol. Ultrasonically-prepared Cu nanoparticles offer better overall conversion of n-butanol and selectivity to butanal due to their more uniform dimension and better surface coverage compared to conventionally prepared catalysts.
Article
Polymer Science
Cornelia Vasile, Daniela Pamfil, Traian Zaharescu, Raluca-Petronela Dumitriu, Gina Mihaela Pricope, Maria Rapa, Gabriel Vasilievici
Summary: This paper evaluates the effect of gamma irradiation on new PLA-based blends and biocomposites, as well as the influence of organic additives on the material properties. The study found that gamma irradiation can modify the structure and thermal properties of the materials, making them suitable for food packaging and medical purposes, while also improving their antimicrobial activity.
Article
Crystallography
Rodica-Mariana Ion, Claudiu Eduard Rizescu, Dan Adrian Vasile, Gabriel Vasilievici, Irina Atkinson, Adriana Rusu, Luminita Predoana, Florin Miculescu
Summary: Stone monuments suffering from aging and loss of properties can be improved with LDHs treatment, with brushing application being more effective than incorporation.
Article
Materials Science, Multidisciplinary
Rodica-Mariana Ion, Marius Gheorghe Barbu, Andrei Gonciar, Gabriel Vasilievici, Anca Irina Gheboianu, Sofia Slamnoiu-Teodorescu, Madalina Elena David, Lorena Iancu, Ramona Marina Grigorescu
Summary: The study identifies seven different pigments used in Roman murals and emphasizes the changes that occur when certain pigments are combined with organic beeswax. Analytical techniques have provided valuable information on the materials and techniques used in Roman mural paintings.
Article
Green & Sustainable Science & Technology
Ana-Maria Galan, Alexandru Vlaicu, Alin Cristian Nicolae Vintila, Mihaela Ciltea-Udrescu, Georgiana Cerchezan, Adriana Nicoleta Frone, Gabriel Vasilievici, Anca Paulenco
Summary: This study investigated the treatment of dairy wastewater and the production of valuable compounds by Porphyridium purpureum under continuous light and a day-night cycle. The results showed that biomass production and compound concentration were positively correlated with lactose concentration. The study demonstrated the potential of using lactose-rich dairy wastewaters for efficient growth of Porphyridium purpureum, leading to biomass increase, lactose reduction, and production of valuable compounds.
Article
Biochemistry & Molecular Biology
Georgiana Dolete, Bogdan Purcareanu, Dan Eduard Mihaiescu, Denisa Ficai, Ovidiu-Cristian Oprea, Alexandra Catalina Birca, Cristina Chircov, Bogdan Stefan Vasile, Gabriel Vasilievici, Anton Ficai, Ecaterina Andronescu
Summary: Mesoporous silica has been widely used as an efficient drug delivery system due to its porous structure. In this study, a novel synthesis method using Tween-20 and starch as templates for mesoporous silica synthesis was developed. The physicochemical features of the obtained material were analyzed, and vancomycin was loaded onto the material using three different approaches. The release rate and drug adsorption depth varied depending on the loading method.
Article
Chemistry, Physical
Andreea Bondarev, Daniela Roxana Popovici, Catalina Calin, Sonia Mihai, Elena-Emilia Sirbu, Rami Doukeh
Summary: The aim of this study was to prepare effective low-cost green adsorbents for nitrate removal from aqueous solutions using spent black tea leaves. The adsorbents were obtained through thermal treatment to produce biochar or by using the untreated tea waste. Various characterization techniques were employed to study the adsorbents before and after adsorption. Experimental conditions such as pH, temperature, and nitrate ions concentration were investigated to evaluate the interaction and potential of the adsorbents. The results indicated that UBT and UBT-TT could serve as novel biowaste and low-cost materials for nitrate ion removal.
Article
Chemistry, Physical
Rami Doukeh, Maria Rapa, Ecaterina Matei, Doina Prodan, Romuald Gyorgy, Ancuta Trifoi, Ionut Banu
Summary: Researchers prepared a tungstophosphoric acid catalyst supported on silica-coated magnetite nanoparticles for the condensation reaction of benzaldehyde and glycerol to produce cyclic acetals. The catalyst was characterized using various physicochemical techniques. The effect of process parameters such as glycerol/benzaldehyde molar ratio, temperature, and catalyst amount on glycerol conversion and product selectivity was studied. Using the Box-Behnken design methodology, the optimal conditions for the reaction were determined. The catalyst also exhibited excellent activity for glycerol acetalization with other aromatic aldehydes.
Article
Pharmacology & Pharmacy
Gabriela Petrisor, Ludmila Motelica, Denisa Ficai, Cornelia-Ioana Ilie, Roxana Doina Trusca, Vasile-Adrian Surdu, Ovidiu-Cristian Oprea, Andreea-Luiza Mirt, Gabriel Vasilievici, Augustin Semenescu, Anton Ficai, Lia-Mara Ditu
Summary: Two types of mesoporous materials, MCM-41 and MCM-48, were functionalized using APTES as a modifying agent. The obtained mesoporous silica materials were loaded with FA and characterized using various techniques. The release behavior of FA was evaluated in vitro at different pH values, and the antimicrobial activity was tested against several microorganisms. The results suggest that these functionalized mesoporous materials can be used as controlled release systems for polyphenols from natural sources.
Review
Chemistry, Physical
Ancuta Roxana Trifoi, Ecaterina Matei, Maria Rapa, Andrei-Constantin Berbecaru, Casen Panaitescu, Ionut Banu, Rami Doukeh
Summary: Magnetite nanoparticles have multifunctional properties that have attracted the interest of researchers from various scientific fields. Several methods have been developed to synthesize magnetic nanoparticles with controlled size, shape, and magnetic properties, with coprecipitation being the most widely used method. Investigation and control of reaction parameters are essential to achieve the desired properties of the nanoparticles.
REACTION KINETICS MECHANISMS AND CATALYSIS
(2023)
Article
Polymer Science
Andrei Moldovan, Stanca Cuc, Doina Prodan, Mircea Rusu, Dorin Popa, Adrian Catalin Taut, Ioan Petean, Dorin Bombos, Rami Doukeh, Ovidiu Nemes
Summary: The present study focused on blending polylactic acid (PLA) with bio nanoadditives to produce nanocomposites for food packaging. Different mixtures were prepared and characterized using various analytical techniques. The results showed that certain compositions had better mechanical strength and stability. Microstructural analysis revealed differences in filler distribution, with one composition showing the most compact and uniform distribution. The study concluded that PLA composites can be used for biodegradable and disposable food packaging with desired properties achieved through proper adjustment of filler proportions.
Article
Chemistry, Physical
Lavinia Marcut, Aurel George Mohan, Iuliana Corneschi, Elena Grosu, Gheorghe Paltanea, Ionela Avram, Alexandra Valentina Badaluta, Gabriel Vasilievici, Cristian-Andi Nicolae, Lia Mara Ditu
Summary: In this study, the surfaces of commercial endotracheal tubes were modified to increase their hydrophobicity. The results showed successful modification and improved biocompatibility of the plasticized PVC samples.
Article
Chemistry, Physical
Cristina Ionela Gogoasa, Cristian Eugen Raducanu, Laura Elisabeta Petras, Doinita Roxana Cioroiu Tirpan, Gabriel Vasilievici, Andreea Luiza Mirt, Tanase Dobre, Oana Cristina Parvulescu
Summary: In this study, a green supported catalyst was developed using bacterial cellulose as catalytic support and biodegradable superbase as a chemical compound. This catalyst showed high efficiency in catalyzing transesterification reactions, resulting in the production of high-purity alkyl esters.
