Article
Biotechnology & Applied Microbiology
Giovanni Pampararo, Gabriella Garbarino, Niccolo Ardoino, Paola Riani, Guido Busca
Summary: This paper investigates the use of pure and silica-supported molybdenum oxide (MoO3) catalysts for the production of acetaldehyde through ethanol oxidative dehydrogenation. Different preparation methods were used to prepare the samples, which were extensively characterized for their structural, morphological, and chemical properties. The acidity of the catalysts was found to limit the yield of acetaldehyde, with a high yield of approximately 60% achieved. Additionally, molybdenum loss through volatilization was observed, and slight deactivation of the catalysts was noted and investigated.
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Thomas Len, Mounib Bahri, Ovidiu Ersen, Yaya Lefkir, Luis Cardenas, Ignacio J. Villar-Garcia, Virginia Perez Dieste, Jordi Llorca, Noemie Perret, Ruben Checa, Eric Puzenat, Pavel Afanasiev, Franck Morfin, Laurent Piccolo
Summary: In Mo/TiO2 catalysts, the interaction between ultradispersed molybdate species and the support structure of rutile titanium nanorods plays a crucial role in achieving high activity and selectivity for methanol production.
Article
Chemistry, Applied
Gabriella Garbarino, Thanh Khoa Phung, Giovanni Pampararo, Paola Riani, Guido Busca
Summary: Moderate addition of silica selectively influences the surface of alumina and modifies its dispersing properties, affecting the catalytic performance of the supported materials.
Article
Chemistry, Multidisciplinary
Xiaoxiong Huang, Shengli Wu, Zhichang Xiao, Debin Konga, Tao Liang, Xianglong Li, Bin Luo, Bin Wang, Linjie Zhi
Summary: This study investigates carbon-based catalysts for the oxidative dehydrogenation of ethanol to acetaldehyde and reveals the roles of different functional groups in the catalytic process. A quantitative map is provided to predict the ideal catalyst structure, and the catalyst shows superior performance compared to reported carbon-catalysts. The study also identifies the ideal balance of surface pyridinic-N/graphitic-N and C-O/C]O in carbon catalysts.
Article
Chemistry, Physical
Tatiana R. Karpova, Liudmila N. Stepanova, Maria A. Moiseenko, Aleksandr V. Lavrenov, Aleksey B. Arbuzov, Evgeniy A. Buluchevskiy, Andrey V. Bukhtiyarov, Tatyana S. Glazneva, Evgeniy Yu. Gerasimov
Summary: The catalytic properties of molybdenum-alumina systems depend on the synthesis conditions. The effect of MoO3/Al2O3 catalyst pretreatment conditions on their activity in propylene and propane conversion was investigated. It was found that activation of the catalyst in an inert gas flow resulted in the highest propylene conversion and yields of metathesis products, while activation in hydrogen increased the activity and selectivity in propane dehydrogenation.
APPLIED CATALYSIS A-GENERAL
(2023)
Article
Chemistry, Multidisciplinary
Jifeng Pang, Ming Yin, Pengfei Wu, Lei Song, Xianquan Li, Tao Zhang, Mingyuan Zheng
Summary: Encapsulation of Cu/MFI catalysts with MFI improved their catalytic performance in ethanol dehydrogenation by anchoring Cu particles, dispersing Cu with smaller sizes, and forming Cu+ species. The optimized (Cu/MFI)@MFI 100% catalyst demonstrated synergistic effects of Cu+ and Cu0 species, resulting in high acetaldehyde selectivity, ethanol conversion, and WHSV.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Chemistry, Physical
Thanh Khoa Phung
Summary: This review focuses on the development of Cu-based catalysts for ethanol dehydrogenation and dehydrogenative coupling reactions, and discusses the effects of Cu charge, particle size and dispersion, support, promoters and reaction conditions on the catalytic activity and selectivity.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Applied
A. Zhukova, S. G. Chuklina, S. A. Maslenkova
Summary: In this study, the influence of the composition and synthesis conditions of Cu-modified (Zr+Ce)O-2-Al2O3 systems on their catalytic properties in ethanol conversion was investigated. It was found that the structure of the Al-Zr mixed oxide support plays a crucial role in forming Cu active sites for ethanol dehydrogenation to acetaldehyde.
Article
Biotechnology & Applied Microbiology
Ioannis Valsamakis, Gabriella Garbarino
Summary: Two synthetic procedures were compared for the production of nanostructured La-based catalysts in this study, showing that both methods can result in materials with higher surface areas and different surface properties. Attention should be paid to impurities during preparation as they greatly affect the stability and catalytic properties of the oxide. The use of hard templating procedure can reduce carbonate formation upon air exposure, stabilizing the starting oxide with lanthanum oxysulfate.
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
(2021)
Article
Energy & Fuels
Haolan Liu, Yuanyuan Jiang, Ruru Zhou, Zhili Chang, Zhaoyin Hou
Summary: In this study, a catalyst with abundant Cu sites and strong metal-support interaction was synthesized through controlled calcination and reduction. The catalyst demonstrated excellent activity and selectivity for the dehydrogenation of ethanol to acetaldehyde, and maintained its activity for a prolonged period of time.
Article
Engineering, Chemical
Yoottapong Klinthongchai, Piyasan Praserthdam, Bunjerd Jongsomjit
Summary: This research explored the synthesis, characteristics, and catalytic activity of various mesoporous carbon materials derived from mesoporous silica materials. The MCF/C exhibited superior catalytic activity in ethanol dehydrogenation compared to other carbon materials, showing stability and recyclability.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2022)
Article
Chemistry, Multidisciplinary
Tomas Pokorny, Vit Vykoukal, Petr Machac, Zdenek Moravec, Nicola Scotti, Pavla Roupcova, Katerina Karaskova, Ales Styskalik
Summary: Comparison of four preparation methods showed that dry impregnation provides Cu/SiO2 materials with the most stable catalytic behavior, despite having a broad particle size distribution.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Chemistry, Applied
Kai Gao, Jerrik Mielby, Soren Kegnaes
Summary: The study demonstrates that Zn-containing MFI zeolites are highly active and selective catalysts for the catalytic dehydrogenation of ethanol. The best catalyst, comprising 5 wt % Zn on Silicalite-1 zeolite, achieves a selectivity of 94.5% towards acetaldehyde at 400 degrees C.
Article
Biochemistry & Molecular Biology
Alexander L. Kustov, Andrey L. Tarasov, Olga P. Tkachenko, Igor V. Mishin, Gennady I. Kapustin, Leonid M. Kustov
Summary: By adding tungsten carbide nanoparticles, the conversion of ethanol to acetaldehyde on mixed oxide ZnO-CuO-SiO2 catalysts has shown enhanced efficiency, especially under microwave heating conditions. The contact points of WC nanoparticles and active centers of the catalyst form hot zones during microwave heating, leading to more efficient acetaldehyde formation at moderate temperatures.
Article
Chemistry, Physical
Gengzhe Song, Qi Wang, Liang Yang, Duohua Liao, Shuang Li
Summary: A series of layered double oxides supported molybdenum oxide catalysts were synthesized and evaluated in the CO2 oxidative dehydrogenation of ethane (CO2-ODHE). The 22.3 wt% Mo/LDO catalyst exhibited high selectivity to ethylene and ethane conversion at relatively low temperatures. The Mo species on the catalysts transformed from [MoO4](2-) to [Mo7O24](6-) and [Mo8O26](4)(-) with the increase of Mo content. Different Mo species showed distinct functions in the CO2-ODHE reaction, with [MoO4](2-) preferring the non-selective pathway, [Mo7O24](6-) promoting the selective pathway, and the existence of [Mo8O26](4-) reducing the ability to activate ethane.
Article
Energy & Fuels
Matteo Borella, Alessandro A. Casazza, Gabriella Garbarino, Paola Riani, Guido Busca
Summary: The thermal degradation pyrolysis of Kraft lignin was investigated at different temperatures in the absence of catalysts. The high sulfur content in the lignin led to the formation of sulfur-containing compounds in the pyrolysis products. The pyrolytic gas was found to be rich in methane, carbon monoxide, carbon dioxide, and hydrogen sulfide, along with other sulfur compounds in smaller amounts. The bio-oil obtained from the pyrolysis contained alkyl-alkoxy phenols, dihydroxy benzenes, and minor amounts of hydrocarbons and sulfur compounds.
Article
Energy & Fuels
J. A. Cecilia, E. Vilarrasa-Garcia, R. Morales-Ospino, E. Finocchio, G. Busca, K. Sapag, J. Villarroel-Rocha, M. Bastos-Neto, D. C. S. Azevedo, E. Rodriguez-Castellon
Summary: This study focuses on the separation of CO2 from emissions using low-cost adsorbents. Zeolite 4A was successfully synthesized from natural kaolinite under specific conditions, showing similar properties to commercial 4A zeolite. The research aims to optimize the synthesis process to enhance CO2 adsorption capacity.
Article
Engineering, Chemical
Giovanni Pampararo, Gabriella Garbarino, Antonio Comite, Guido Busca, Paola Riani
Summary: CuO-ZnAl2O4 based catalysts were tested for selective dehydrogenation of ethanol to acetaldehyde. Different preparation procedures were adopted, and a novel Cu-SSC catalyst showed high yield and selectivity. The catalysts can be efficiently pre-reduced in the reactant mixture and have a long deactivation time.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Chemistry, Applied
Gabriella Garbarino, Giovanni Pampararo, Elisabetta Finocchio, Guido Busca, Antonella Gervasini, Sebastiano Campisi, Brigida Silvestri, Claudio Imparato, Antonio Aronne
Summary: Amorphous catalytic materials belonging to the Nb2O5-P2O5-SiO2 system were prepared through a sustainable sol-gel procedure, exhibiting strong acidity and good selectivity in ethanol conversion but with the generation of by-products at high temperature and conversion.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
Article
Chemistry, Applied
Elena Spennati, Paola Riani, Gabriella Garbarino
Summary: In the context of energy transition and CO2 emission reduction, CO2 hydrogenation using green hydrogen to produce Synthetic Natural Gas is a promising option. Ni-based catalysts, due to their low cost and natural abundance, are widely studied and used for methanation reaction at temperatures ranging from 573 to 673 K. However, these catalysts exhibit inadequate activity at low temperatures, low reducibility and dispersion, and can be deactivated by sintering or coke deposition. The addition of lanthanides, particularly lanthanum and cerium, has been explored as a solution to overcome the limitations of Ni-based catalysts. This paper provides a comprehensive review of recent advances in the development of lanthanides promoted Ni catalysts, including their effect on catalytic properties and performance.
Article
Engineering, Environmental
Giovanni Pampararo, Gabriella Garbarino, Paola Riani, Vit Vykoukal, Guido Busca, Damien P. Debecker
Summary: Copper-based catalysts are commonly used in dehydrogenation reactions, but they are prone to deactivation by sintering and coke deposition. A promising alternative is the use of aerosol-assisted sol-gel method to prepare Cu-SiO2 catalysts with high metal dispersion. Compared to catalysts made by impregnation, the aerosol-made catalysts show better stability, higher ethanol conversions, and selectivity above 75% for acetaldehyde.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Paola Riani, Elena Spennati, Maria Villa Garcia, Vicente Sanchez Escribano, Guido Busca, Gabriella Garbarino
Summary: Samples of NiO on silica and alumina doped with silica were prepared and characterized. The SiO2 support showed low Ni dispersion ability, producing segregated NiO particles and dispersed Ni2+ in exchange sites, while the Si-doped alumina formed a surface spinel monolayer phase, leading to the formation of NiO. H2-TPR results indicated that NiO particles are more easily reduced than Ni species. Low loading Ni/SiO2 catalysts showed high selectivity and moderate activity for RWGS reaction, while high loading Ni/SiO2 catalysts showed both methanation and RWGS with short-term deactivation for methanation. Ni on alumina-rich carriers exhibited high activity and selectivity for methanation, attributed to small nickel clusters or metal particles interacting with alumina.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Review
Energy & Fuels
Guido Busca, Elena Spennati, Paola Riani, Gabriella Garbarino
Summary: A detailed analysis of scientific literature data on the use of nickel supported over oxides as catalysts for CO2 methanation was conducted. The results suggest that an ionic support is essential for effective dispersion of nickel and the production of small metal particles, which are highly active in the methanation reaction and limit the formation of carbonaceous materials. The use of support and/or surface additives with medium surface basicity enhances the adsorption of CO2 and increases the reaction rate. It is also recommended to use a medium nickel loading and operate at temperatures where Ni(CO)(4) formation is not possible. Additionally, systems based on doped Ni/Al2O3 and Ni/CeO2 were found to have promising properties when doped with basic and reactive oxides like MnOx or/and CeO2.
Article
Biochemistry & Molecular Biology
Sina Ebrahim Atakoohi, Elena Spennati, Alessandro A. Casazza, Paola Riani, Gabriella Garbarino
Summary: The study evaluated the pyrolysis of end-of-life olive stone under different operating parameters, finding that product composition was significantly influenced by the parameters, while changes in biomass particle size had a negligible effect.
Article
Chemistry, Multidisciplinary
Xuan-Tien Pham, Thong Le Minh Pham, Xuan Thang Cao, Khanh B. Vu, Vy Anh Tran, Gabriella Garbarino, Thanh Khoa Phung
Summary: Catalytic conversion of lignin into valuable liquid products using reduced Ru/C catalyst was investigated. The results showed that the catalyst is stable and active for the conversion of lignin model compound. For Kraft lignin, the catalyst enhanced the conversion, with the highest conversion achieved using ethanol solvent at high temperature.
