Article
Chemistry, Physical
Yulia Ivanova, Lyubov Isupova
Summary: Mixed oxides MexCo3-xO4 (Me: Ni or Mg, x = 0-0.9) with a spinel structure were synthesized by precipitation and subsequent modification methods. The catalytic activity of the samples in the nitrous oxide decomposition process was studied. It was found that the degree of cobalt substitution greatly influenced the crystallization, surface area, and surface oxygen species of the oxides. The highest activity was observed in the catalyst with a degree of substitution of 0.1, particularly the nickel-substituted sample.
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, Applied
Charles A. Roberts, Vinod K. Paidi, Michael Shepit, Torin C. Peck, Kimber L. Stamm Masias, Johan van Lierop, Gunugunuri K. Reddy
Summary: A Cu-substituted, Co-based spinel catalyst was introduced for direct NO decomposition to N-2 and O-2. The catalyst demonstrated high reactivity and selectivity, as well as the ability to mitigate N2O formation. X-ray characterization revealed the effects of Cu substitution on the catalyst structure and activity.
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, Physical
Mehran Nozari-Asbemarz, Mandana Amiri, Ali Khodayari, Abolfazl Bezaatpour, Sima Nouhi, Pouya Hosseini, Michael Wark, Rabah Boukherroub, Sabine Szunerits
Summary: NF/Co3O4/CoFe2O4 composite electrode was synthesized from a metal-organic framework and showed enhanced electrocatalytic activity for the oxygen evolution reaction in alkaline medium. The presence of Co3+ and Fe3+ in the octahedral sites of Co3O4 and CoFe2O4 was attributed to the enhanced OER activity, leading to stable current density and activity over multiple OER experiments.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
O. A. Bulavchenko, T. N. Afonasenko, Z. S. Vinokurov, A. A. Pochtar, V. A. Rogov, S. V. Tsybulya
Summary: The effect of gallium oxide intercalation on the catalytic properties and structural aspects of MnOx-Al2O3 catalysts was investigated. Thermal activation was found to increase catalytic activity, while intercalation changed the phase transformation route and stabilized the structure of the mixed oxide. However, it also had a negative impact on the production of active Mn3O4 particles and weakly bound oxygen.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Nanoscience & Nanotechnology
Daire Tyndall, Lee Gannon, Lucia Hughes, Julian Carolan, Sergio Pinilla, Sonia Jaskaniec, Dahnan Spurling, Oskar Ronan, Cormac McGuinness, Niall McEvoy, Valeria Nicolosi, Michelle Philippa Browne
Summary: Recently, it has been found that mixed transition metal oxide (TMO)/MXene catalysts exhibit better performance in the oxygen evolution reaction (OER) compared to TMO only catalysts. This study investigates the reasons behind this improvement by preparing and characterizing mixed Co(OH)(2)/Ti3C2Tx catalysts for the OER. The results show that the improved electrocatalysis in the composite material is attributed to the presence of higher Co oxide oxidation states and the mechanical stability provided by MXene.
NPJ 2D MATERIALS AND APPLICATIONS
(2023)
Article
Engineering, Environmental
Siyuan Wang, Siqi Liu, Xi Chen, Yongxue Guo, Xiaoyu Xu, Lijuan Yang, Yi Zhao, Chuanmin Chen, Hanting Liang, Runlong Hao
Summary: This study developed a nonstoichiometric Mn-Co bimetallic spinel catalyst, MnCo2O4.5, which showed excellent activity in mineralizing low concentration volatile organic compounds (VOCs) under ambient temperature. The catalyst exhibited high stability, pH adaptivity, and good reusability. This novel method provides a new perspective for the development of low-temperature VOCs control technologies.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Inorganic & Nuclear
T. C. Anusree, Anuj A. Vargeese
Summary: This study investigates the catalytic effects of different nano catalysts, including cobalt-doped CuCr2O4, on the thermal decomposition of ammonium perchlorate (AP). The results show that cobalt-doped CuCr2O4 exhibits the highest catalytic efficiency and can significantly reduce the decomposition temperature of AP.
JOURNAL OF SOLID STATE CHEMISTRY
(2022)
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
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
Chemistry, Physical
Nadeem Asghar Khan, Iqbal Ahmad, Naghmana Rashid, Muhammad Nadeem Zafar, Farooq Khurum Shehzad, Zahid Ullah, Anwar Ul-Hamid, Muhammad Faizan Nazar, Muhammad Junaid, Muhammad Faheem, Syed Salman Shafqat, Uzma Jabeen, Alaa Dahshan
Summary: This study synthesized Co3O4, Co9S8, and their heterostructure Co3O4/Co9S8 as water oxidation catalysts, and found that the Co3O4/Co9S8 heterostructure showed excellent electrocatalytic activity at low onset potential, along with good long-term stability and a low Tafel slope.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Multidisciplinary
Haoxiang Zhang, Jong In Choi, Jung-Weon Choi, Se-Min Jeong, Pyung-Soo Lee, Do-Young Hong
Summary: A porous MgAl2O4 spinel-supported Mn3O4 catalyst shows high efficiency and stability in the glycolysis of PET, with a high surface area and resistance to Mn leaching.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2022)
Article
Chemistry, Physical
Zhe Xu, Yijie Wu, Qiuyi Ji, Taozhu Li, Chenmin Xu, Chengdu Qi, Huan He, Shaogui Yang, Shiyin Li, Shicheng Yan, Cheng Sun, Limin Zhang, Zhigang Zou
Summary: Identifying the spatial effects of cobalt cations in cobalt-based heterogeneous catalysts is essential for developing effective peroxymonosulfate (PMS) activators in water treatment. The study found that octahedral cobalt species exhibit superior intrinsic activities compared to tetrahedral ones, and interface kinetics characterized by systemic electrochemical techniques determine the intrinsic activity of the catalyst. Additionally, the flat band potentials of cobalt-based oxides reflecting Fermi level positions play a role in activating PMS.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Multidisciplinary
Prakash Ramakrishnan, Keon Beom Lee, Geon-Ju Choi, Il-Kyu Park, Jung Inn Sohn
Summary: In this study, a chromium (Cr) substituted NiCrFeO4 nanocatalyst was synthesized using electrospinning, showing improved oxygen evolution reaction (OER) performance compared to Cr-free and commercial NiFe2O4 compounds. The Cr-substituted catalyst exhibited lower overpotential and Tafel slope values, as well as excellent OER durability, making it a promising candidate for OER applications.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2021)
