Article
Green & Sustainable Science & Technology
Mariusz Wadrzyk, Rafal Janus, Marek Lewandowski, Aneta Magdziarz
Summary: This study focuses on investigating the effect of reaction conditions, particularly the reaction atmosphere type, on the composition of volatiles generated during the pyrolysis of lignin. It was found that processing temperature has a significant impact on the composition changes of volatiles, while the pyrolysis atmosphere has minor qualitative effects but noticeable quantitative differences in their concentration. The complex molecular structure of lignin was confirmed through the identification of phenol derivatives, aliphatic oxygen compounds, and aromatic hydrocarbons as primary and secondary products of lignin decomposition.
Review
Energy & Fuels
Man Lang, Hao Li
Summary: This review highlights recent achievements in catalysts for the hydrodeoxygenation conversion of lignin-derived phenolics into cyclohexane. The characteristics and reaction mechanisms of novel catalysts are summarized and discussed, aiming to provide a perspective for the design and development of highly active catalysts. Furthermore, suggestions for improving existing challenges and potential opportunities in this field are presented to inspire scientists to utilize biomass resources in fuel and chemical production.
Article
Energy & Fuels
Mingming Peng, Taiki Muraishi, Xiaofan Hou, Minghui Zhao, Kenji Kamiya, Eika W. Qian
Summary: A heterogeneous Mo-based oxide catalyst system with hydrogen peroxide as an oxidant was developed for the oxidative depolymerization of lignin to produce high-value platform chemicals in a nearly neutral aqueous environment. The effects of various reaction conditions, including reactant ratios, temperature, duration, and lignin concentration, were investigated. The combination of MoO3 and H2O2 resulted in a superior peroxo complex, leading to the formation of vanillin and lactic acid. The highest yield and selectivity of vanillin were achieved with a MoO3/Al2O3 catalyst, while the highest yield of lactic acid was obtained with MoO3/SiO2.
Article
Chemistry, Multidisciplinary
Rubieli Carla Frezza Zeferino, Vinicius Aleixo Angonese Piaia, Vinicius Tres Orso, Vitor Machado Pinheiro, Micheli Zanetti, Gustavo Lopes Colpani, Natan Padoin, Cintia Soares, Marcio Antonio Fiori, Humberto Gracher Riella
Summary: In this study, neryl acetate was successfully synthesized through heterogeneous catalysis, with optimal conditions of 40 degrees C temperature, 7% catalyst content, 1:4 molar ratio, 250 rpm agitation speed, and 3 mmol nerol content. The catalyst showed high conversion and selectivity even after 3 cycles of reuse, indicating low loss of catalytic activity.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Huaipu Yan, Qian Liao, Yuqing Chen, Gagik G. G. Gurzadyan, Binghui Lu, Chao Wu, Lei Shi
Summary: Co-porphines were discovered to be highly efficient MHAT catalysts for chemoselective allene functionalization under photoirradiation with a loading of only 0.01 mol %. The combination of photo Co-MHAT and Ti catalysis enabled successful carbonyl allylation, providing expedient access to beta-functionalized homoallylic alcohols in over 100 examples with exceptional regio- and diastereoselectivity. Mechanism studies supported the key role of selectively transferring hydrogen atoms from cobalt hydride to allenes and generating allyl radicals in the catalytic cycle.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Alessandra De Santi, Susanna Monti, Giovanni Barcaro, Zhenlei Zhang, Katalin Barta, Peter J. Deuss
Summary: Acidolysis combined with stabilization of reactive intermediates is a powerful method for lignin depolymerization, leading to high yields of aromatic monomers. This study aims to elucidate key mechanistic questions using a combination of experimental and computional approaches.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2021)
Article
Chemistry, Physical
Hongmin Zhang, Qingzhu Jia, Fangyou Yan, Qiang Wang
Summary: In this study, CuMgAl layered double oxides (CuMgAl-LDOs) were obtained via calcination of CuMgAl layered double hydroxides (CuMgAl-LDHs), and their potential as catalysts for the degradation of sulfameter using persulfate was investigated. The results showed that CuMgAl-LDO exhibited a lamellar structure and large specific surface area, and could achieve high removal efficiency of sulfameter over a wide range of concentrations. The stability and effectiveness of CuMgAl-LDO as a catalyst for the activation of persulfate in the degradation of organic pollutants were also demonstrated.
GREEN ENERGY & ENVIRONMENT
(2022)
Article
Agricultural Engineering
Linh Thanh Nguyen, Dieu-Phuong Phan, Arslan Sarwar, My Ha Tran, Ok Kyung Lee, Eun Yeol Lee
Summary: Lignin is a renewable aromatic resource and the most abundant aromatic biopolymer on Earth, with over 50 million tons of waste lignin generated annually. Efforts to develop efficient lignin valorization technologies are increasing, with a focus on thermochemical depolymerization and biological conversion processes. The integrated valorization method combining thermochemical depolymerization and biological conversion shows promise for increasing the production of value-added products from waste lignin.
INDUSTRIAL CROPS AND PRODUCTS
(2021)
Article
Engineering, Chemical
Rubieli Carla Frezza Zeferino, Vinicius Aleixo Angonese Piaia, Vinicius Tres Orso, Vitor Machado Pinheiro, Micheli Zanetti, Gustavo Lopes Colpani, Natan Padoin, Cintia Soares, Marcio Antonio Fiori, Humberto Gracher Riella
Summary: This study focuses on synthesizing geranyl acetate using the ion exchange resin Lewatit (R) GF 101 and achieved optimal experimental conditions for high selectivity and conversion rates. The reaction kinetics revealed a significant difference between the main and secondary reactions, and the catalyst showed good reusability with minimal loss of activity after multiple cycles.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2021)
Article
Chemistry, Applied
Zixuan Zhou, Peng Gao
Summary: This study summarizes the progress in the rational design and construction of efficient catalysts for CO2 hydrogenation to produce chemicals and liquid fuels. The structure-performance relationship, nature of the active sites, and reaction mechanisms of these catalysts are explored using computational and experimental evidence. The results of this study will promote further fundamental research and industrial applications in the field.
CHINESE JOURNAL OF CATALYSIS
(2022)
Review
Chemistry, Multidisciplinary
Peng Zhou, Ziliang Yuan, Jie He, Tingfeng Fang, Bing Liu, Zehui Zhang
Summary: Aerobic oxidative cleavage of C-C bonds is a sustainable approach for synthesizing valuable molecules such as esters, nitriles, and amides. Traditional catalytic systems require harsh conditions, stoichiometric oxidants, and noble metal catalysts, leading to environmental concerns. Developing efficient, low-cost, and environmentally friendly methods for C-C bond cleavage is of great importance in modern chemistry.
CHEMICAL COMMUNICATIONS
(2023)
Review
Chemistry, Multidisciplinary
Peng Zhou, Ziliang Yuan, Jie He, Tingfeng Fang, Bing Liu, Zehui Zhang
Summary: The aerobic oxidative cleavage of C-C bonds is an attractive and sustainable method for constructing valuable molecules. Traditional methods face thermodynamic and kinetic barriers, hence developing efficient, low-cost, and environmentally friendly cleavage methods is crucial.
CHEMICAL COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
Yongzhuang Liu, Noemi Deak, Zhiwen Wang, Haipeng Yu, Lisanne Hameleers, Edita Jurak, Peter J. Deuss, Katalin Barta
Summary: Deep eutectic solvents (DES) are intriguing green reaction media for biomass processing, however, the typical drawback of undesired lignin condensation has been addressed by developing a tunable ternary DES system that allows for stabilization of reactive intermediates for efficient lignocellulose fractionation.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Yuki Saito, Shu Kobayashi
Summary: The application of heterogeneous catalysts in continuous-flow enantioselective hydroacylation reactions was studied. Catalysts were prepared by mixing supports and rhodium complexes, and showed excellent activity and enantioselectivity. Under optimized conditions, the catalysts exhibited high turnover numbers and could be applied to various substrates. Furthermore, sequential-flow reactions with other heterogeneous catalysts were demonstrated for the synthesis of biologically active molecules and functional materials.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Review
Energy & Fuels
Erwei Leng, Yilin Guo, Jingwei Chen, Shuai Liu, Jiaqiang E, Yuan Xue
Summary: This paper comprehensively reviews the pyrolysis of lignin, including mechanism, modeling, and the effects of inorganic species. It discusses the pyrolysis characteristics, depolymerization mechanism, and different types of models used, as well as the influences of alkali metals, alkaline earth metals, and transition metals on lignin pyrolysis. Challenges and prospects are also discussed in the last section of the article.
Article
Chemistry, Applied
S. Merida-Morales, C. Garcia-Sancho, M. Oregui-Bengoechea, M. J. Gines-Molina, J. A. Cecilia, P. L. Arias, R. Moreno-Tost, P. Maireles-Torres
Summary: Different zirconium-doped mesoporous silicas were synthesized and evaluated for glucose dehydration to 5-hydroxymethylfurfural (HMF). The Zr-doped mesoporous HMS silica showed the best catalytic performance, but also displayed faster deactivation. With simple washing, this catalyst can be reused for multiple runs.
Article
Chemistry, Physical
C. Garcia-Sancho, C. P. Jimenez-Gomez, N. Viar-Antunano, J. A. Cecilia, R. Moreno-Tost, J. M. Merida-Robles, J. Requies, P. Maireles-Torres
Summary: ZrO2, Al2O3, and ZrO2/Al2O3 catalysts with different Zr/Al molar ratios were synthesized and characterized. The Zr5Al5 catalyst with a Zr/Al ratio of 1 exhibited the highest conversion and yield in the reduction of furfural reaction due to its abundant acid sites, specific surface area, and pore volume.
APPLIED CATALYSIS A-GENERAL
(2021)
Article
Energy & Fuels
Jon Solar, Frederik Hippe, Alexander Babich, Blanca M. Caballero, Isabel de Marco Rodriguez, Carmen Barriocanal, Alex Lopez-Urionabarrenechea, Esther Acha
Summary: The study investigates the influence of pyrolysis temperature on the combustion behavior of biomass-derived charcoal under conditions simulating tuyere injection operations. Results show that higher pyrolysis temperature leads to lower charcoal yields, decreased volatile matter and oxygen content, and increased carbon content. Charcoal particle size affects conversion degree in the injection rig reactor, with significant differences observed between different temperature charcoal properties.
Article
Engineering, Chemical
I Agirre, E. Acha, J. F. Cambra, V. L. Barrio
Summary: Excess renewable energy can be converted into hydrogen through methanation, forming a closed energy loop with carbon dioxide, and the efficiency of the reaction can be enhanced through in situ water sorption.
CHEMICAL ENGINEERING SCIENCE
(2021)
Article
Chemistry, Physical
B. Torres-Olea, C. Garcia-Sancho, J. A. Cecilia, M. Oregui-Bengoechea, P. L. Arias, R. Moreno-Tost, P. Maireles-Torres
Summary: Nb-Zr oxides were evaluated for glucose dehydration to produce 5-hydroxymethylfurfural. The study showed a linear relationship between the amount of acid sites and niobium content. Nb2O5 demonstrated the highest acid concentration and surface area, with both Bronsted and Lewis acid sites, while Zr-containing catalysts mostly exhibited Lewis acid sites. The combination of CaCl2 and Zr-containing catalysts resulted in direct formation of HMF without fructose, in contrast to Nb2O5 which possesses both types of acid sites. A HMF yield of 44% was achieved with Nb3Zr7 as acid catalyst and CaCl2 after 90 minutes at 175°C, with the catalysts being reusable for at least 3 runs without pretreatment.
MOLECULAR CATALYSIS
(2021)
Article
Polymer Science
Laura Fulgencio-Medrano, Sara Garcia-Fernandez, Asier Asueta, Alexander Lopez-Urionabarrenechea, Borja B. Perez-Martinez, Jose Maria Arandes
Summary: This paper aims to produce oils for refineries from the pyrolysis of high plastic waste rejected by the recycling industry. Pre-treatments and temperature were studied to improve liquid yield and quality while reducing impurities.
Article
Chemistry, Physical
Clara Jarauta-Cordoba, Mikel Oregui Bengoechea, Iker Agirrezabal-Telleria, Pedro-Luis Arias, Inaki Gandarias
Summary: In this study, a series of Pt-WOx/gamma-Al2O3 catalysts were prepared by adjusting the pH of the impregnation solutions, and the nature of bifunctional active sites for the selective production of 1,3-propanediol was elucidated by adding in situ titrants.
Article
Thermodynamics
Nerea Viar, Jesus M. Requies, Ion Agirre, Aitziber Iriondo, Cristina Garcia-Sancho, Pedro L. Arias
Summary: In this study, catalysts supported on biomass-derived carbon were used for the hydrogenolysis of HMF to produce DMF and DMTHF in a continuous flow reactor. The carbon-supported catalysts showed good activity and selectivity, outperforming commercial carbon-supported catalysts in terms of selectivity and stability.
Article
Environmental Sciences
A. Serras-Malillos, E. Acha, A. Lopez-Urionabarrenechea, B. B. Perez-Martinez, B. M. Caballero
Summary: This study presents the thermodynamic and kinetic multi-reaction modeling of the pyrolysis vapors and gases upgrading process in Aspen Plus software. The models predict the theoretical and in-between scenario of a thermal upgrading process of an experimentally characterized vapors and gases stream. The influence of temperature and pressure operating parameters are analyzed in the outlet composition, residence time, and possible reaction mechanisms occurring. The kinetic model is validated against experimental data and shows good fit.
Article
Green & Sustainable Science & Technology
Jorge Blanco, Maria Linares, Manuel Lopez Granados, Ion Agirre, Inaki Gandarias, Pedro Luis Arias, Jose Iglesias, Jovita Moreno, Alicia Garcia
Summary: This study compares the production of maleic anhydride from different feedstock using life cycle analysis and exergy analysis. The results show that the gas phase oxidation of furfural is competitive with petrochemical technologies, while the aqueous phase process is not viable due to energy and environmental concerns. The environmental footprint of the starting raw material is the major drawback for the new furfural-to-maleic anhydride production processes. The use of environmentally friendly furfural production technologies at the commercial scale can improve the environmental performance of gas phase maleic anhydride production.
ADVANCED SUSTAINABLE SYSTEMS
(2022)
Article
Chemistry, Physical
Esther Acha, Ion Agirre, V. Laura Barrio
Summary: Methanation using Power-to-Gas technology is gaining attention as it enables the production of green methane from CO2 and H2. In situ water sorption is proposed to improve this process, but the challenge lies in finding effective water sorbents at useful reaction temperatures. This study investigates the water sorption capacity of different materials at temperatures ranging from 25 to 400 degrees Celsius. The results show that modified lanthana-Ba and dolomite sorbents exhibit promising water sorption values, outperforming zeolite sorbents under the same operating conditions.
Review
Chemistry, Physical
Ane Bueno, Asier Barredo, Nerea Viar, Jesus Requies
Summary: The production of FDCA from sugars is an important challenge in reducing dependence on fossil fuels. Various strategies, including physical separation and one-pot transformation, have been investigated to achieve efficient conversion of sugars to FDCA. The development of catalytic systems functional for both dehydration and oxidation reactions is crucial. This review summarizes recent research on the catalytic systems for the direct production of FDCA from sugars, including both one-step and two-step integrated systems.
Article
Chemistry, Physical
Asier Asueta, Laura Fulgencio-Medrano, Rafael Miguel-Fernandez, Jon Leivar, Izotz Amundarain, Ana Iruskieta, Sixto Arnaiz, Jose Ignacio Gutierrez-Ortiz, Alexander Lopez-Urionabarrenechea
Summary: In this study, the low-temperature pyrolysis of a real plastic mixture sample collected from a WEEE-authorised recycling facility was investigated. The objective was to maximize the liquid fraction and understand the role of different polymers in the generation of oil. The pyrolysis oils obtained from WEEE plastic waste showed similar heating values and combustion toxicity as commercial fuel oil.
Article
Chemistry, Multidisciplinary
M. Angulo, I. Agirre, A. Arratibel, M. A. Llosa Tanco, D. A. Pacheco Tanaka, V. L. Barrio
Summary: A series of pore flow-through catalytic nonselective membrane reactors were studied for steam methane reforming, with the efficiency of the reactions depending on the number of gamma-Al2O3/YSZ layers.
REACTION CHEMISTRY & ENGINEERING
(2022)
Article
Electrochemistry
Nekane Nieto, Olatz Noya, Amaia Iturrondobeitia, Paula Sanchez-Fontecoba, Usue Perez-Lopez, Veronica Palomares, Alexander Lopez-Urionabarrenechea, Teofilo Rojo
Summary: Hard carbon derived from different agro-industrial biowastes showed promising anode performance for sodium-ion batteries. Pretreatment with hydrothermal carbonization enhanced the discharge capacity of biowaste samples under high cycling rates. This study provides new insights into the development of biomass-derived hard carbons as anode materials.