Article
Chemistry, Physical
Kristina Denisova, Alexander A. Ilyin, Ruslan Rumyantsev, Julia Sakharova, Alexander P. Ilyin, Natalya Gordina
Summary: The highest catalytic activity of cobalt ferrite nanoparticles in the reaction of nitrous oxide (N2O) decomposition was reported to be 98.1% at 475 degrees Celsius, with the catalysts' structure and catalytic properties correlated and characterized through various tests including X-ray diffraction, thermal analysis, and scanning electron microscopy.
Article
Chemistry, Physical
Ewa M. Iwanek (nee Wilczkowska), Leonarda F. Liotta, Giuseppe Pantaleo, Krzysztof Krawczyk, Ewa Gdyra, Jan Petryk, Janusz W. Sobczak, Zbigniew Kaszkur
Summary: The research investigates how the addition of a small amount of LaCoO3 affects the activity of a Co3O4 catalyst, finding that LaCoO3 enhances the activity of the catalyst and improves the desorption rate of oxygen molecules from the catalyst surface.
Article
Chemistry, Multidisciplinary
Anna Klegova, Katerina Pacultova, Tomas Kiska, Joanna Grybos, Zbigniew Sojka, Lucie Obalova
Summary: Structured foam catalysts containing Co and Cs for N2O decomposition were prepared using conventional and organic-assisted impregnation methods. Organic-assisted impregnation resulted in smaller particles and different faceting. The use of glycerol increased the specific rate constant for N2O decomposition, while urea decreased it. The optimal amount of Cs in Co3O4 deposited on the foam was higher than in the bulk Co3O4-Cs due to the dispersion of Cs species over the support. Glycerol led to better surface coverage by spinel phase, reducing the cesium distribution on the support. It also refaceted the spinel nanocrystals and improved resistance to gaseous contaminates. (c) 2023 The Author(s). Published by Elsevier B.V. on behalf of King Saud University. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
ARABIAN JOURNAL OF CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Thanpisit Lomphithak, Selin Helvacioglu, Ilaria Armenia, Sandeep Keshavan, Jesus G. Ovejero, Giovanni Baldi, Costanza Ravagli, Valeria Grazu, Bengt Fadeel
Summary: This study evaluated the cytotoxicity of iron oxide nanoparticles and their Co-functionalized counterparts, and found that cell death with features of ferroptosis occurred at higher concentrations, with the functionalized nanoparticles demonstrating stronger toxicity. Furthermore, it was shown that the cell death triggered by the nanoparticles was autophagy-dependent. Overall, high concentrations of polymer-coated iron oxide nanoparticles induce ferroptosis in susceptible human cancer cells.
Article
Thermodynamics
Clayton R. Mulvihill, Sulaiman A. Alturaifi, Eric L. Petersen
Summary: This study measured the low-pressure limit rate constant of the N2O + M reaction using laser absorption spectroscopy and analyzed the results with excellent agreement with historical data. The determined expression for the rate constant showed better stability and precision over a wide temperature range.
COMBUSTION AND FLAME
(2021)
Article
Chemistry, Physical
Anna Klegova, Katerina Pacultova, Tomas Kiska, Pavlina Peikertova, Anna Rokicinska, Piotr Kustrowski, Lucie Obalova
Summary: By investigating the interactions between Cs-Co3O4 and different washcoats, it was found that SiO2 and TiO2 washcoats had the largest surface areas, and SiO2 did not interact with the active phase. The catalytic activity was closely related to the surface Cs/Co molar ratio and the surface Co3+/Co2+ molar ratio.
MOLECULAR CATALYSIS
(2022)
Article
Engineering, Chemical
Anna Klegova, Katerina Pacultova, Tomas Kiska, Lucie Obalova
Summary: Co3O4 modified with Cs was deposited on an alpha- Al2O3 open-cell foam and tested for low-temperature N2O decomposition. The effect of the amount of active phase on N2O conversion was studied, and it was found that increasing the amount of active phase can enhance the catalyst activity.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Polymer Science
Aaliyah Z. Dookhith, Nathaniel A. Lynd, Gabriel E. Sanoja
Summary: Polyethers are widely used in engineering and biomedical applications due to their ability to interact with various polar small molecules and sustain large reversible deformations. In this study, two families of polyether networks were synthesized and the relationship between network architecture and fracture properties was explored. The key finding is that living copolymerizations can control the fracture resistance of polyether networks, offering the potential to design functional and mechanical properties of soft materials.
Review
Chemistry, Physical
Yong Zhang, Zhigao Tian, Lin Huang, Honghong Fan, Qiufei Hou, Ping Cui, Wanqiang Wang
Summary: This review provides an overview of noble metal-based catalysts used in the direct catalytic decomposition of N2O, with a focus on recent advances. The review discusses various factors that influence the catalyst performance, such as catalyst supports, preparation methods, additives, and impurity gases. Additionally, future trends in catalyst systems for the direct catalytic decomposition of N2O are also discussed.
Review
Energy & Fuels
Miao Miao, Man Zhang, Hao Kong, Tuo Zhou, Xinhua Yang, Hairui Yang
Summary: The circulating fluidized bed (CFB) technology has been rapidly developed as a clean fuel combustion method, but faces high N2O emissions. Research focus has shifted towards N2O decomposition and removal technologies due to strict pollution control standards. Noble metals and molecular sieves show promising activity at low temperatures, while metal oxide catalytic technology, especially oxygen carrier-aided combustion (OCAC), is considered the ideal method for N2O removal in CFB boilers.
Article
Chemistry, Multidisciplinary
Shengyang Ni, Franck Le Vaillant, Ana Mateos-Calbet, Ruben Martin, Josep Cornella
Summary: This study reveals a catalytic synthesis of cycloalkanols using N2O as an oxygen transfer agent onto sp(3)-hybridized carbons. The protocol offers mild conditions and a wide substrate scope, providing an opportunity to access carbocyclic compounds from simple precursors, even in an enantioselective manner.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Pablo Molinillo, Bertrand Lacroix, Florencia Vattier, Nuria Rendon, Andres Suarez, Patricia Lara
Summary: In this study, it was found that RuSNS nanoparticles can catalyze the reduction of the greenhouse gas N2O to N-2 using different hydrosilanes.
CHEMICAL COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
Agnieszka Sidorowicz, Valentina Margarita, Giacomo Fais, Antonella Pantaleo, Alessia Manca, Alessandro Concas, Paola Rappelli, Pier Luigi Fiori, Giacomo Cao
Summary: In this study, silver, titanium dioxide, cobalt (II) hydroxide and cobalt (II,III) oxide nanomaterials were successfully synthesized from Spirulina platensis extract. The silver nanoparticles and cobalt (II) hydroxide nanomaterials showed strong antifungal activity against Candida species, and their activity was affected by light exposure.
Article
Chemistry, Physical
G. Grzybek, J. Grybos, P. Indyka, J. Janas, K. Ciura, B. Leszczynski, F. Zasada, A. Kotarba, Z. Sojka
Summary: The K-ZnxCo3-xO4 catalyst supported on alpha-Al2O3 for N2O decomposition was investigated for its resistance towards typical contaminants in tail gases. The impact of contaminants like O2, H2O, and NO on N2O conversion was examined through kinetic and thermodynamic modeling, proposing inhibition mechanisms involving both local and global effects. The shape changes of spinel nanocrystals were found to affect the performance of the catalyst.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Multidisciplinary
Seongmin Choi, Ki Bok Nam, Heon Phil Ha, Dong Wook Kwon
Summary: Cu supported on Ce-Y via CeO2-Y2O3 solid solution was reformed to improve the activity in catalytic N2O decomposition. Cu/Ce0.5Y0.5 achieved the highest activity. The number of accessible sites and oxygen vacancies increased with Y species loading, but the activity of Cu/Ce0.1Y0.9 decreased due to the difficulty of releasing O2.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2023)
Article
Nanoscience & Nanotechnology
Bastian Reiprich, Karolina A. Tarach, Kamila Pyra, Gabriela Grzybek, Kinga Gora-Marek
Summary: Layer-like FAU-type zeolite Y was successfully synthesized by an organosilane-assisted low-temperature hydrothermal method, and its catalytic activity in LDPE cracking was verified. The structure and properties of zeolite Y were analyzed using various techniques, and its catalytic performance and coking were evaluated through experiments on catalyst selectivity and coke residue.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Gabriela Grzybek, Kinga Gora-Marek, Karolina Tarach, Kamila Pyra, Piotr Patulski, Magdalena Greluk, Grzegorz Slowik, Marek Rotko, Andrzej Kotarba
Summary: In this study, the impact of potassium on the performance of cobalt-zeolite catalysts in ethanol steam reforming process was investigated. The presence of potassium altered the reaction mechanism, leading to a decrease in ethanol conversion and reduced production of undesired ethylene.
JOURNAL OF CATALYSIS
(2022)
Article
Chemistry, Physical
Magdalena Greluk, Marek Rotko, Grzegorz Slowik, Sylwia Turczyniak-Surdacka, Gabriela Grzybek, Kinga Gora-Marek, Andrzej Kotarba
Summary: The effect of a potassium promoter on the stability and resistance to carbon deposit formation of Ni/MnOx catalyst under SRE conditions was investigated. The addition of a low amount of potassium improved the catalyst's stability by limiting carbon formation and increasing the rate of steam gasification of carbon.
Article
Chemistry, Physical
Katarzyna Adamska, Szymon Smykala, Sebastian Zielinski, Damian Szymanski, Pawel Stelmachowski, Andrzej Kotarba, Janina Okal, Leszek Kepinski
Summary: A novel bimetallic RuRe/TiO2 nanocatalyst was synthesized and demonstrated to exhibit high catalytic activity and stability in soot oxidation. The performance of the nanocatalyst can be further improved by adjusting the TiO2 support and rhenium content.
Article
Chemistry, Physical
Pawel Stelmachowski, Karolina Kadela, Gabriela Grzybek, Monika Golda-Cepa, Krzysztof Kruczala, Andrzej Kotarba
Summary: This study addresses the instability of plasma-induced changes of graphene paper material and finds that post-plasmatic reactions in water significantly affect the functionalization degree and electronic properties of plasma-modified graphene paper by increasing the concentration of oxygen functional groups.
Article
Biochemistry & Molecular Biology
Pawel Stelmachowski, Dominik Maj, Gabriela Grzybek, Krzysztof Kruczala, Andrzej Kotarba
Summary: Surface-modified graphite is studied for various applications, with plasma treatment used to create relevant surface functionalities, particularly oxygen groups. The study found that water immersion significantly decreases the work function of plasma-treated samples, accompanied by a decrease in the number of radicals introduced by plasma.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Nanoscience & Nanotechnology
Aleksander Ejsmont, Karolina Kadela, Gabriela Grzybek, Termeh Darvishzad, Grzegorz Slowik, Magdalena Lofek, Joanna Goscianska, Andrzej Kotarba, Pawel Stelmachowski
Summary: This study investigates the effect of oxidative pretreatment of mesoporous carbon on the deposition of cobalt oxide phases. It was found that the oxidative pretreatment of mesoporous carbon influences the speciation of the deposited cobalt oxide phase. In addition, the activity of the electrocatalysts in the oxygen evolution reaction is positively correlated with the relative content of COO-type groups and negatively correlated with the relative content of COO-type groups on the carbon support. Moreover, a high relative content of COO-type groups on the carbon support is correlated with the presence of well-dispersed Co3O4 nanoparticles.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Katerina Karaskova, Katerina Pacultova, Tereza Bilkova, Dagmar Fridrichova, Martin Kostejn, Pavlina Peikertova, Pawel Stelmachowski, Pavel Kukula, Lucie Obalova
Summary: Co4-iZniAlOx mixed oxides were prepared and modified with potassium for catalytic NO decomposition. The catalyst showed high activity and stability.
Article
Chemistry, Applied
Szymon Wierzbicki, Termeh Darvishzad, Joanna Grybos, Pawel Stelmachowski, Zbigniew Sojka, Krzysztof Kruczala
Summary: The role of active centers in the oxygen reduction and evolution reactions (ORR and OER) in alkaline media was revealed by studying nitrogen and sulfur doped multi-walled carbon nanotubes (MWCNTs) with deposited manganese-cobalt spinel catalysts. The synthesized catalysts were characterized and their electrocatalytic activities in ORR and OER were examined. It was found that the N and S doped MWCNT catalysts exhibited high activity in ORR, and the addition of the spinel phase did not improve the electrocatalytic properties. However, in OER, the activity of the samples with dispersed spinel active phase was comparable to that of the benchmark catalyst RuO2.
Review
Chemistry, Physical
Piotr Legutko, Pawel Stelmachowski, Xuehua Yu, Zhen Zhao, Zbigniew Sojka, Andrzej Kotarba
Summary: This review discusses catalytic systems for soot combustion, with a focus on alkali-containing materials. The most active catalysts for low-temperature activity, apart from platinum group metal (PGM) based systems, are those that contain alkalis as beneficial dopants. The promotion of alkali by surface doping or nanostructuration of transition metal oxides has emerged as an effective method for developing soot oxidation catalytic materials. Three-dimensional macroporous materials that enhance the contact between catalyst and soot particles are also discussed. Reactivity descriptors for alkali-promoted catalysts are proposed for the rational design of catalytic materials for soot oxidation.
Article
Engineering, Environmental
Gabriela Grzybek, Magdalena Greluk, Piotr Patulski, Pawel Stelmachowski, Karolina Tarach, Grzegorz Slowik, Marek Rotko, Susana Valencia, Fernando Rey, Kinga Gora-Marek
Summary: The focus of the ongoing global energy transformation is on hydrogen production in the ethanol steam reforming (ESR) process. Researchers have successfully developed a cobalt catalyst based on the ZSM-5 zeolite support, and analyzed its performance using various physicochemical characterization methods and real-time UV-Vis and FT-IR spectroscopy studies in the ESR conditions. The influence of potassium introduction and the impact of zeolite acidity on the cobalt phase oxidation state were also investigated. The study results challenge the existing paradigm of low activity and stability of zeolite-based ESR catalysts, and provide hope for the development of competitive catalysts.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Mohamed Abbas, JiaMing Wang, Pawel Stelmachowski, Jiangang Chen, Andrzej Kotarba
Summary: Noble metal-free hydroxyapatite/graphite composite catalysts with transition metal nanoparticles were used for the hydrogenation reaction of dimethyl oxalate. CoCu/HAp/G exhibited the highest methyl glycolate selectivity of 99.3%. The increase of experimentally measured work function values was found to improve the turnover frequency and selectivity, and Cu+ ions played a role in maintaining the stability of selectivity with increasing reaction temperatures.
CATALYSIS SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Physical
Zi-Ye Liu, Qian-Yu Wang, Ji-Ming Hu
Summary: In this study, a layered carbon dot composite catalyst (NiFe LDH@CDs) was prepared using a one-step coprecipitation method, without the need for heating or hydrothermal treatment. The CD-functionalized catalyst facilitated rapid charge transfer and accelerated the oxygen evolution reaction. Additionally, the heterojunction structure formed between NiFe LDH and CDs efficiently suppressed photoelectron-hole recombination.
CATALYSIS SCIENCE & TECHNOLOGY
(2024)
Article
Chemistry, Physical
Rohit Kumar, Ankit Kumar Srivastava, Palaniyappan Nagarasu, Vedichi Madhu, Ekambaram Balaraman
Summary: We designed and synthesized a NN-CoII bidentate complex and used it for the amination of alcohols under mild and solventless conditions. The complex exhibited good reactivity towards both primary and sterically hindered secondary alcohols, providing high yields of amines. The pyrazole moiety in the ligand played a crucial role in the reaction. Furthermore, we demonstrated the reusability of the complex as a homogeneous cobalt catalyst.
CATALYSIS SCIENCE & TECHNOLOGY
(2024)
Article
Chemistry, Physical
Shivanand Chettri, Liang-Ting Wu, Sagarmani Rasaily, Debesh Sharma, Bikram Gurung, Rajani Dewan, Sudarsan Tamang, Jyh-Chiang Jiang, Anand Pariyar
Summary: Replicating the enzymatic surface microenvironment in vitro is challenging, but constructing an analogous model could facilitate our understanding of surface effects and aid in developing an efficient bioinspired catalytic system. In this study, five unique Cu2O morphologies were generated, and the surface morphology variations were found to be a consequence of differences in the exposure of low-index facets. The reactivity of Cu2O was found to be influenced by the proportion of {110} planes, with r-Cu2O exhibiting the highest reactivity.
CATALYSIS SCIENCE & TECHNOLOGY
(2024)
Article
Chemistry, Physical
Yong Tang, Jianhao Qiu, Dingliang Dai, Guanglu Xia, Lu Zhang, Jianfeng Yao
Summary: Defect engineering has been shown to improve the photocatalytic performance. This study investigated the use of defect-rich UiO-66-NH2 wrapped by ZnIn2S4 as a catalyst for photocatalytic H2O2 production. The defects in UiO-66-NH2 enhanced O-2 adsorption and charge separation, leading to higher H2O2 yield. The insights from this work can advance the research in defect engineering of MOFs and photocatalytic H2O2 synthesis.
CATALYSIS SCIENCE & TECHNOLOGY
(2024)
Article
Chemistry, Physical
Ruiyang Qu, Shuxin Mao, Jana Weiss, Vita A. Kondratenko, Evgenii V. Kondratenko, Stephan Bartling, Haifeng Qi, Annette-Enrica Surkus, Kathrin Junge, Matthias Beller
Summary: The hydrogenation of amides, a challenging reaction usually performed at high temperatures, has been achieved under milder conditions using a new Pt-MoOx/TiO2 catalyst. This catalyst system enables the selective hydrogenation of various amides and imides.
CATALYSIS SCIENCE & TECHNOLOGY
(2024)
Article
Chemistry, Physical
Xiaoran Niu, Ao Wang, Lei Tong, Lei Wang, Yuan Kong, Chenliang Su, Hai-Wei Liang
Summary: This study introduces a novel intermetallic PdCu3 catalyst supported on defective nanodiamond-graphene (ND@G), which exhibits high selectivity (95%) and remarkable activity (turnover frequency: 2940 h(-1)), six times higher than that of the commercial Lindlar catalyst.
CATALYSIS SCIENCE & TECHNOLOGY
(2024)
Review
Chemistry, Physical
Zhiyuan Zheng, Yiming Yue, Hongying Zhuo, Qinggang Liu, Yanqiang Huang
Summary: This review presents the recent research advances on single-atom catalysis for deep reduction of CO2. Detailed introductions and summaries were classified into three categories based on proton-coupled multi-electron transfer approaches: strengthening metal-support interaction, rational design and regulation of coordination environment, and development of SACs with multi-atom active sites. The challenges and future research directions in the field of SACs for CO2 reduction are also proposed.
CATALYSIS SCIENCE & TECHNOLOGY
(2024)
Article
Chemistry, Physical
Shiv Kumar, Paramita Datta, Anup Bhunia, Swadhin K. Mandal
Summary: This article reports a transition-metal-free process for in situ denitrogenation of tosylhydrazones, resulting in the production of various sulfones. The authors used a phenalenyl-based odd alternant hydrocarbon as a photoredox catalyst, which acted as a potent oxidant to facilitate the denitrogenation reaction. The method showed wide functional-group tolerance and high yields, making it suitable for late-stage modification of natural products.
CATALYSIS SCIENCE & TECHNOLOGY
(2024)
Article
Chemistry, Physical
L. A. Luque-Alvarez, J. Gonzalez-Arias, F. Romero-Sarria, T. R. Reina, L. F. Bobadilla, J. A. Odriozola
Summary: Currently, the production of acetic acid through the carbonylation reaction of methanol has limitations, leading to the exploration of alternative methods using heterogeneous catalysts. This study investigates the methanol carbonylation reaction over a Cu-H-MOR catalyst and proposes a reaction mechanism based on the catalytic behavior and performance of the catalyst. The results provide insights into the reaction mechanism and the involvement of acid and redox centers.
CATALYSIS SCIENCE & TECHNOLOGY
(2024)