Article
Chemistry, Physical
Di Yu, Yu Ren, Xuehua Yu, Xiaoqiang Fan, Lanyi Wang, Ruidan Wang, Zhen Zhao, Kai Cheng, Yongsheng Chen, Zbigniew Sojka, Andrzej Kotarba, Yuechang Wei, Jian Liu
Summary: This study successfully prepared two types of soot oxidation catalysts, which exhibited excellent performance in the presence of water, especially the birnessite-type K2Mn4O8 catalysts showed good tolerance for sulfur and water. The study also discovered the important role of interlayer gallery species ions (K+, H2O) in the catalytic activity of birnessite materials in soot combustion, which has not been recognized before.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Physical
Yuexi Yang, Dongyue Zhao, Zhongnan Gao, Ye Tian, Tong Ding, Jing Zhang, Zheng Jiang, Xingang Li
Summary: The interface interaction between Co3O4 and OMS-2 promotes the generation of oxygen vacancies, enhancing the activity sites for soot combustion. With optimized catalyst structure design, the apparent soot oxidation activity is significantly improved.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Electrochemistry
Daniel R. Jones, Haytham E. M. Hussein, Eleri A. Worsley, Sajad Kiani, Kittiwat Kamlungsua, Thomas M. Fone, Christopher O. Phillips, Davide Deganello
Summary: Manganese(III/IV) oxide, synthesized under different conditions, was investigated for its morphological, compositional, and electrochemical characteristics. The study found that low-temperature basic and acidic synthesis promoted the formation of turbostratic birnessite and cryptomelane phases, respectively. The choice of intercalating guest cations had a stronger effect on storage properties than crystallographic phase. The insights gained from this study provide a foundation for optimizing NaxKyMnOz for high-power storage applications.
Article
Chemistry, Physical
Salvador Montilla-Verdu, Alvaro Diaz-Verde, Veronica Torregrosa-Rivero, Maria Jose Illan-Gomez
Summary: In this study, the role of BaMn1-xNixO3 mixed oxide catalysts in NOx-assisted diesel soot oxidation was analyzed. The results showed that the catalysts with higher nickel content exhibited the highest soot conversion and selectivity to CO2. However, the catalytic performance was not significantly affected by the nickel content. Two catalysts were synthesized to improve the catalytic activity, and they showed higher activity for NO and soot oxidation due to the increased nickel content on the surface.
Article
Chemistry, Physical
Xinbo Zhu, Xiqiang Wu, Jin Liu, Jianbin Luo, Zhengda Yang, Ye Jiang, Geng Chen
Summary: In this study, soot oxidation was investigated using a series of Mn-X/gamma-Al2O3 (M = Ce, Co and Cu) binary catalysts in a dielectric barrier discharge reactor. The results showed that doping with Ce, Co, and Cu improved the soot conversion rate and slightly increased the CO2 selectivity compared to oxidation with Mn/gamma-Al2O3 catalyst. The effects of discharge power, oxygen content, and reaction temperature on plasma-catalytic soot oxidation were analyzed. Catalyst characterizations were conducted to understand the reaction mechanisms and pathways.
Article
Engineering, Environmental
Chunmiao Jia, Jiajian Gao, Kuniadi Wandy Huang, Vishal Jose, Prapisala Thepsithar, Jong-Min Lee
Summary: CuO/γ-Al2O3 catalyst showed excellent catalytic activity in methanol-SCR process, efficiently removing NOx without deactivation.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Physical
Alexander J. Hoffman, Chithra Asokan, Nicholas Gadinas, Emily Schroeder, Gregory Zakem, Steven V. Nystrom, Andrew Rean Getsoian, Phillip Christopher, David Hibbitts
Summary: Oxide-supported Rh catalysts play an important role in pollution abatement. This study investigates the active structure of Rh on oxide supports using probe molecule FTIR spectroscopy. The results suggest that CO desorption may be the rate-determining step in NO-CO reactions. DFT calculations and experimental observations also indicate that the coverage of hydroxyl groups on the support surface affects both the Rh structure and the kinetics of NO reduction.
Article
Energy & Fuels
Monika Fedyna, Piotr Legutko, Joanna Grybos, Xuehua Yu, Zhen Zhao, Andrzej Kotarba, Zbigniew Sojka
Summary: Two series of cryptomelane doped with Cu2+ and Ag+ ions were synthesized and additionally impregnated with other ions to obtain bi- and tri-metallic catalysts. The catalysts were thoroughly characterized and tested for soot oxidation under different reaction conditions. The role of doping was examined and discussed in terms of its influence on catalytic soot oxidation performance, NO2 formation, and resistance to SO2. The study found that doping can enhance NO2 production during soot oxidation and improve resistance to sulphur poisoning of the catalyst. However, the correlation between NO2 production and catalyst activity is weak.
Article
Chemistry, Physical
Monika Fedyna, Piotr Legutko, Joanna Grybos, Janusz Janas, Xuehua Yu, Zhen Zhao, Andrzej Kotarba, Zbigniew Sojka
Summary: The study synthesized and characterized cryptomelane catalysts containing transition metals, and tested their soot oxidation activity under various conditions. The results showed significant effects of dopants on NO2 formation and a correlation with CO2 formation, while doping could enhance sulfur resistance.
APPLIED CATALYSIS A-GENERAL
(2021)
Article
Green & Sustainable Science & Technology
Cihang Niu, Baorui Wang, Yi Xing, Wei Su, Chi He, Lei Xiao, Yurong Xu, Shuqi Zhao, Yonghong Cheng, Jian-Wen Shi
Summary: A new Tm-modified Mn/TiO2 catalyst was developed for low temperature NO removal, showing significantly improved SCR de-NOx performance with NH3 as reducing agent. Introduction of appropriate Tm content enhanced the surface properties and reactivity of the catalyst, leading to enhanced de-NOx capabilities.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Biochemistry & Molecular Biology
Magdalena M. Michel, Mostafa Azizi, Dorota Miroslaw-Swiatek, Lidia Reczek, Bogumil Cieniek, Eleonora Soco
Summary: A low concentration of manganese (Mn) in water is a critical issue for water supply systems. The study investigated the impact of different types of manganese oxides (MnOx) and pH on Mn adsorption level. The analysis showed that the type of MnO2 has a four times stronger influence than pH. There was no statistical significance for the ionic strength parameter.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Engineering, Environmental
Wen Qin, Peng Rao, Ken Fang, Lifan Liu, Xing Du, Yunlong Luo, Jiayu Tian
Summary: A vertical aeration-aided gravity driven ceramic membrane reactor was developed and used to purify groundwater contaminated with manganese. The results showed that a stable concentration of manganese in the effluent was achieved due to the formation of a matured birnessite functional layer on the ceramic membrane surface. The trade-off effect within the reactor was solved by reconstructing the birnessite-type film and increasing the water production flux. Vertical aeration also increased the abundance of manganese oxidizing bacteria.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Article
Biochemistry & Molecular Biology
Shiping Wei, Wenxiu Wang, Feirong Xiao
Summary: Manganese oxides are reactive minerals that are believed to be mainly formed through biotic processes. This study isolated and characterized a marine Mn-oxidizing fungus Neoroussoella solani MnF107. The fungus was found to form Mn oxides on its hyphal surfaces, with a filamentous morphology and enveloped by an EPS matrix. XRD analysis showed that the fungal Mn oxides were poorly crystalline, and chemical analysis confirmed they were predominantly composed of Mn(IV) resulting from the oxidation of Mn(II) by the fungus.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Chemistry, Physical
Raziyeh Jokar, Seyed Mehdi Alavi, Mehran Rezaei, Ehsan Akbari
Summary: The study found that the 10wt% CuO/MnO2 catalyst exhibited the best catalytic performance in CO preferential oxidation reaction, attributed to the synergistic interaction between copper and manganese. However, adding CO2 and/or H2O to the feedstock decreased the catalyst performance.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Energy & Fuels
Luis C. M. Ruivo, Helena Gomes, Daniela V. Lopes, Aleksey A. Yaremchenko, Catarina Vilas-Boas, Luis A. C. Tarelho, Jorge R. Frade
Summary: In this study, catalytic gasification of biomass using a supported Fe2-xMnxO3 catalyst was investigated. The catalyst was found to have a significant impact on tar conversion and gasification parameters. Post-mortem analysis of the catalyst provided insights into redox changes and the presence of sulfur.
Article
Chemistry, Applied
A. F. Suarez-Escobar, L. R. Conde-Rivera, F. E. Lopez-Suarez, M. J. Illan-Gomez, K. S. Gonzalez-Hernandez, J. S. Chalapud-Morales
Summary: Recent studies have shown that common medications and waste tires can have potential impacts on water sources and the environment. By synthesizing activated carbon catalysts from waste tire rubber, titanium dioxide, and silver, researchers are exploring the use of these materials for photocatalytic removal of pharmaceuticals in water. The results indicate differences in catalyst performance for the removal of ibuprofen under various conditions.
TOPICS IN CATALYSIS
(2021)
Article
Chemistry, Multidisciplinary
Arantxa Davo-Quinonero, Sergio Lopez-Rodriguez, Esther Bailon-Garcia, Dolores Lozano-Castello, Agustin Bueno-Lopez
Summary: This study reveals that CuO/cryptomelane exhibits high activity as a CO-PROX catalyst and shows robust performance in the presence of CO2 and H2O. Despite lower oxygen mobility compared to CuO/CeO2, the presence of intrinsic structural water in CuO/cryptomelane assists in active oxygen restitution, enhancing its catalytic performance and stability.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2021)
Article
Engineering, Chemical
Carlos G. Aguilar-Madera, Raul Ocampo-Perez, Esther Bailon-Garcia, E. C. Herrera-Hernandez, Cristian Y. Chaparro-Garnica, Arantxa Davo-Quinonero, Dolores Lozano-Castello, Agustin Bueno-Lopez, Elias Garcia-Hernandez
Summary: This study simulated the CO-PROX reaction in a CuO/CeO2 catalyst-supported monolith built by 3D-printing under different temperatures, identifying different reactive regimes. The simulation results were in good agreement with experimental results, and sensitivity analysis showed that the composition of gas mixture significantly affects the ratio of reaction rates.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Chemistry, Physical
Sergio Lopez Rodriguez, Arantxa Davo-Quinonero, Jeronimo Juan-Juan, Esther Bailon-Garcia, Dolores Lozano-Castello, Agustin Bueno-Lopez
Summary: The study showed a dual effect of Pr-doped Ru/CeO2 catalysts on CO2 methanation, with low Pr content enhancing oxygen mobility but high Pr content hindering CO2 dissociation. At high temperatures, Pr improves oxygen mobility which promotes CO2 dissociation, balancing out the negative effects of hindering dissociation at the interface.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Physical
Cristian Yesid Chaparro-Garnica, Esther Bailon-Garcia, Arantxa Davo-Quinonero, Patrick Da Costa, Dolores Lozano-Castello, Agustin Bueno-Lopez
Summary: Researchers have demonstrated that 3D printing allows for the creation of high-performance carbon integral monoliths with a complex network of interconnected channels, outperforming conventional catalysts in heterogeneous catalysis reactions. This novel design enhances the CO2 methanation rate by 25% at 300 degrees C due to the forced turbulent flow into the channels network, opening up new synthesis options for tailored heterogeneous catalysts.
Article
Chemistry, Multidisciplinary
Vicente Albaladejo-Fuentes, Maria-Salvadora Sanchez-Adsuar, James A. Anderson, Maria-Jose Illan-Gomez
Summary: The NOx storage mechanism on BaTi0.8Cu0.2O3 catalyst involves the formation of nitrites and nitrates, with the main pathway depending on temperature and time on stream. At lower temperatures, NO adsorption leads to nitrites formation, while at higher temperatures, the catalyst activity for NO oxidation promotes NO2 generation and nitrate formation.
Article
Polymer Science
Adriana Paola Franco-Bacca, Fernando Cervantes-Alvarez, Juan Daniel Macias, Joan Alexis Castro-Betancur, Reynell Junior Perez-Blanco, Oscar Hernan Giraldo Osorio, Nayda Patricia Arias Duque, Geonel Rodriguez-Gattorno, Juan Jose Alvarado-Gil
Summary: Polymer engineering at the molecular level has been effective in modulating thermal conductivity, with the addition of borax to cassava starch biopolymer films resulting in a linear increase in thermal conductivity. The highest thermal conductivity is achieved at a borax volume fraction of 1.40%, beyond which heat carriers scattering phenomena cause a decrease in thermal conductivity.
Article
Chemistry, Multidisciplinary
Veronica Torregrosa-Rivero, Maria-Salvadora Sanchez-Adsuar, Maria-Jose Illan-Gomez
Summary: A series of BaMnO3 solids (BM-CX) were prepared using a modified sol-gel method with carbon black and different calcination temperatures. The use of low calcination temperatures in the presence of carbon black led to improvements in terms of smaller crystal size, increased surface area, and decreased pore diameter range. The catalyst series exhibited enhanced catalytic performance, with BM-C700 showing the best stability and initial soot oxidation rate.
Article
Engineering, Chemical
Jon A. Onrubia-Calvo, Adrian Quindimil, Arantxa Davo-Quinonero, Alejandro Bermejo-Lopez, Esther Bailon-Garcia, Benat Pereda-Ayo, Dolores Lozano-Castello, Jose A. Gonzalez-Marcos, Agustin Bueno-Lopez, Juan R. Gonzalez-Velasco
Summary: The reaction kinetics of CO2 methanation over a highly active 8.5% Ni/CeO2 catalyst was studied, and the formate route was found to accurately predict the experimental data.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Chemistry, Physical
Veronica Torregrosa-Rivero, Maria-Salvadora Sanchez-Adsuar, Maria-Jose Illan-Gomez
Summary: This study suggests that BaMnO3 and copper-doped BaMnO3 perovskites could be feasible alternatives to current catalysts for Gasoline Particle Filters (GPF). By modifying the synthesis routes, the physical and chemical properties of these perovskites can be improved to enhance the catalytic performance. The presence of oxygen vacancies and a labile Mn (IV)/Mn (III) redox pair is crucial for the best catalytic performance in removing soot in gasoline direct injection engines.
Article
Biochemistry & Molecular Biology
Alvaro Diaz-Verde, Salvador Montilla-Verdu, Veronica Torregrosa-Rivero, Maria-Jose Illan-Gomez
Summary: In this study, two series of BaxMnO3 and BaxFeO3 (x = 1 and 0.7) catalysts were synthesized using the sol-gel method adapted to aqueous medium. The catalytic activity for CO and GDI soot oxidation was determined, and the results showed that a decrease in the Ba content improved the catalytic performance of both catalysts. Manganese-based perovskites achieved better catalytic performance than iron-based perovskite for CO oxidation due to the higher generation of active sites.
Article
Biochemistry & Molecular Biology
Gema Gil-Munoz, Juan Alcaniz-Monge, Maria Jose Illan-Gomez
Summary: This study investigates the impact of Zr, W, and V isomorphous framework substitution on the adsorption and desorption kinetics of propene and toluene on commercial ZSM-5 and beta zeolites. The characterization data show that Zr does not modify the crystalline structure, W forms a new crystalline phase, and V causes the breakdown of the zeolite structure. The substituted zeolites exhibit narrower microporosity, different adsorption capacity and kinetics of hydrocarbons compared to pristine zeolites, but the relationship between these modifications and porosity/acidity changes depends on zeolite type, hydrocarbon type, and inserted cation.
Article
Chemistry, Physical
Nawel Ghezali, Alvaro Diaz Verde, Maria Jose Illan Gomez
Summary: By varying the composition of perovskite-type mixed oxides, it is possible to improve their structure, oxygen mobility, and catalytic performance, achieving effective oxidation of soot under simulated Gasoline Direct Injection engine exhaust conditions.
Article
Chemistry, Physical
Cristian Yesid Chaparro-Garnica, Esther Bailon-Garcia, Dolores Lozano-Castello, Agustin Bueno-Lopez
Summary: A new method to synthesize integral carbon monoliths with a controlled channel morphology has been developed by combining 3D-printing technology and sol-gel polymerization. The carbon monolith with tortuous channels showed improved catalytic performance compared to a conventional honeycomb design, due to enhanced gas-phase contact and diffusion within the carbon skeleton. This work demonstrates the potential of 3D printing to enhance catalytic supports currently available.
CATALYSIS SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Physical
Jon A. Onrubia-Calvo, Benat Pereda-Ayo, Jose A. Gonzalez-Marcos, Agustin Bueno-Lopez, Juan R. Gonzalez-Velasco
Summary: The study investigates the viability of LaNiO3/CeO2 formulations as precursors for CO2 methanation, with the 10% LaNiO3/CeO2 precursor demonstrating high activity, selectivity, and stability. The interaction between Ni, La2O3 and CeO2 enhances the efficiency of CO2 methanation and the stability of the catalyst.
CATALYSIS SCIENCE & TECHNOLOGY
(2021)