Article
Chemistry, Physical
Thuy Ha Nguyen, Han Bom Kim, Eun Duck Park
Summary: CO2 methanation using ceria-supported cobalt catalysts with low cobalt contents was studied. The catalytic performance and physicochemical properties were influenced by the preparation method and treatment temperature. Among the catalysts tested, the ceria-supported cobalt catalyst prepared by wet impregnation method and calcined in air at 500 degrees C, then reduced in H-2 at 500 degrees C, showed the best catalytic performance.
Article
Chemistry, Multidisciplinary
Bogdan Jurca, Lu Peng, Ana Primo, Alvaro Gordillo, Amarajothi Dhakshinamoorthy, Vasile Parvulescu, Hermenegildo Garcia
Summary: This study investigates the influence of metallic and non-metallic elements on the catalytic activity of Co-Fe@C catalysts. Pd enhances CO2 conversion and CH4 selectivity, while Ce reduces CO selectivity. The presence of Ca remarkably increases CO2 conversion and CH4 selectivity, while sulfur acts as a strong poison. The combination of sulfur and alkali metals maintains selectivity and increases conversion.
Article
Engineering, Environmental
Yan Resing Dias, Oscar W. Perez-Lopez
Summary: Mitigating CO2 emissions has become an important issue nowadays, and converting CO2 to CH4 as a natural gas substitute and H2 storage source is an interesting alternative. In this study, Ni/SiO2 catalysts promoted by Fe, Co and Zn were prepared and showed improved performance in CO2 conversion to methane, with Ni-Co/SiO2 achieving the best results in terms of CO2 conversion and CH4 selectivity.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Chemistry, Physical
Samane Gholami, Seyed Mehdi Alavi, Mehran Rezaei
Summary: In this study, a series of Cr2O3 powders modified by different promoters were synthesized and used as catalyst carriers for CO2 methanation. Among them, Mn-promoted Cr2O3 exhibited the best catalytic performance for 20 wt%Ni catalysts. The increase in Mn content up to 15 wt% improved catalytic performance due to enhanced nickel dispersion and catalyst reducibility.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Wei Wang, Ekaterina Toshcheva, Adrian Ramirez, Genrikh Shterk, Rafia Ahmad, Mustafa Caglayan, Jose Luis Cerrillo, Abhay Dokania, Gerard Clancy, Tuiana B. Shoinkhorova, Nibras Hijazi, Luigi Cavallo, Jorge Gascon
Summary: The synthesis of K-promoted Fe-Co bimetallic catalysts through a modified one pot sol-gel approach and their performance for the selective hydrogenation of CO2 to liquid hydrocarbons were reported. The high dispersion of K and Co on the catalysts was achieved, and both K and Co significantly influenced catalyst activity and selectivity. The addition of K increased the affinity of the catalyst towards the adsorbed species, while the presence of Co facilitated the spontaneous dissociation of H2. The optimized catalyst exhibited a C-5(+) space time yield of 15.8 mmol g(cat.)^(-1) h^(-1) with a C-5(+) selectivity of 51% at a CO2 conversion of 35%.
CATALYSIS SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Physical
Liliana P. L. Goncalves, Maria Meledina, Alexander Meledin, Dmitri Y. Petrovykh, Juliana P. S. Sousa, O. Salome G. P. Soares, Yury Kolen'ko, M. Fernando R. Pereira
Summary: N-doping is crucial for enhancing the catalytic performance of carbon nanotube-supported Ni catalysts for CO2 methanation. The N-doping improves the dispersion of Ni on the CNT support, leading to higher CO2 conversion and methane selectivity.
Article
Chemistry, Multidisciplinary
Thalita S. Galhardo, Adriano H. Braga, Bruno H. Arpini, Janos Szanyi, Renato Goncalves, Bruno F. Zornio, Caetano R. Miranda, Liane M. Rossi
Summary: Control of the selectivity of CO2 hydrogenation catalysts is a fundamental challenge. In this study, it was found that changing the surface of a common Ni catalyst can lead to high selectivity toward CO formation in CO2 hydrogenation processes, representing an important step towards high-added-value products.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Chemistry, Physical
Thongthai Witoon, Thanapha Numpilai, Khanin Nueangnoraj, Chin Kui Cheng, Metta Chareonpanich, Jumras Limtrakul
Summary: Recycling CO2 into light olefins is a promising method for reducing CO2 emissions. In this study, Fe-Co-K catalyst supported on different carbon materials were prepared and evaluated for CO2 hydrogenation to light olefins. The catalyst exhibited improved activity and selectivity towards light olefins due to enhanced metal dispersion and increased contact area. MMC support showed better performance in promoting olefins selectivity compared to MC support.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Engineering, Chemical
Tiancheng Pu, Liang Shen, Jing Xu, Chong Peng, Minghui Zhu
Summary: In the CO2 hydrogenation reaction, it is demonstrated that different activation mechanisms are employed due to varying H-2 dissociation capabilities over supported Ni catalysts with different particle sizes. This provides a convincing experimental explanation for the structural sensitivity of nickel-based catalysts.
Article
Chemistry, Physical
Khairul Naim Ahmad, Wan Nor Roslam Wan Isahak, Masli Irwan Rosli, Muhammad Rahimi Yusop, Mohammad B. Kassim, Mohd Ambar Yarmo
Summary: In this study, nickel catalysts supported on exfoliated graphitic carbon nitride with cerium (Ni-Ce/eg-C3N4) and lanthanum (Ni-La/eg-C3N4) as promoters showed improved catalytic performance in CO and CO2 methanation compared to un-promoted Ni/eg-C3N4 catalyst, attributed to increased mesopores, better dispersion of Ni nanoparticles, moderate metal-support interaction, and enhanced surface basic sites. The Ce promoter and eg-C3N4 support increased the capacity of CO2 adsorption and activation sites, resulting in high catalytic activity for CO2 methanation at low temperatures.
APPLIED SURFACE SCIENCE
(2022)
Article
Energy & Fuels
Soohyun Kim, Yunxia Yang, Renata Lippi, Hokyung Choi, Sangdo Kim, Donghyuk Chun, Hyuk Im, Sihyun Lee, Jiho Yoo
Summary: The use of low-rank coal as a catalyst support for CO2 methanation can enhance diffusion and adsorption behavior, leading to improved process efficiency. Nickel showed to be the most active metal when supported on low-rank coal, and doping with promoters like Cerium and Magnesium further increased CO2 conversion percentage. The modified LRC-based catalysts exhibited similar or higher activity than commercial metal oxide-supported catalysts, with stable performance over extended periods.
Article
Chemistry, Physical
Parisa Shafiee, Seyed Mehdi Alavi, Mehran Rezaei, Farzad Jokar
Summary: Fe, Mn, La, Ce, and Ba-promoted 15 wt%Ni-12.5 wt%Co-Al2O3 catalysts show improved catalytic performance in CO2 methanation reaction, with the Fe-promoted catalyst exhibiting the highest catalytic activity. The study also evaluated the effect of calcination temperature, feed composition, and gas hourly space velocity (GHSV) on the catalyst performance, confirming the Fe-promoted catalyst's superior performance.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Sana Ullah, Emma C. Lovell, Tze Hao Tan, Bingqiao Xie, Priyank Kumar, Rose Amal, Jason Scott
Summary: The study showed that illuminating the Co10/Lax-TiO2 catalyst with visible light can enhance the efficiency of CO2 methanation reaction, especially with lanthanum (La) doping, which significantly lowers the activation energy and improves CO2 conversion.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Materials Science, Ceramics
Yulin Wei, Jun Ji, Fuxin Liang, Deli Ma, Zhenyu Zhang, Yuhang Du, Zhe Pang, Honglei Wang, Qinggang Li, Guopu Shi, Zhi Wang
Summary: Ce-P/γ-Al2O3 coatings were prepared using freeze-drying technique on foam ceramics and subsequently used as Pd catalysts. Phosphoric acid replaced hydroxyl on the γ-Al2O3 surface, creating polyhydroxy P-containing sites that attracted cerium oxide. Palladium oxide was embedded into cerium oxide vacancies. Freeze drying produced a coating with large specific surface area and uniform mesoporous structure, inhibiting nanoparticle agglomeration. Phosphoric acid modification increased the number of active sites and weakly acidic sites.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Dongyang Zhang, Jianbo Zhang, Run Li, Huiyong Chen, Qingqing Hao, Yonghui Bai, Jianxuan Shang, Lei Zhang, Xiaoxun Ma
Summary: This study investigates the effects of thermal treatment temperature and nickel nitrate impregnation concentration on the CO2 methanation reaction using commercially available coal char supported nickel catalysts.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Nanoscience & Nanotechnology
Alla G. Dyachenko, Olena V. Ischenko, Olena V. Goncharuk, Mykola V. Borysenko, Olexandr V. Mischanchuk, Volodymyr M. Gun'ko, Dariusz Sternik, Vladyslav V. Lisnyak
Summary: Four different catalysts were prepared for CO2 methanation, with Ni(5)Co(5)/SiO2 and Ni(2)Co(8)/SiO2 showing excellent catalytic activity and high methane yield. The methanation reaction was found to pass through the formation of O-containing intermediates bound to the active Ni-Co and nanosilica sites, as revealed by thermo-programmed desorption mass spectroscopy.
APPLIED NANOSCIENCE
(2022)
Article
Physics, Applied
Ludmila Yu. Matzui, Oleksii A. Syvolozhskyi, Ludmila L. Vovchenko, Olena S. Yakovenko, Oleksandra A. Lazarenko, Tetyana A. Len, Olena V. Ischenko, Alla G. Dyachenko, Anna V. Vakaliuk, Victor V. Oliynyk, Volodymyr V. Zagorodnii
Summary: This study investigates the microstructure, electrical percolation behavior, and electromagnetic shielding efficiency of conductive polymer composites with a segregated structure and hybrid fillers. The composite materials exhibit a lower percolation threshold and higher shielding efficiency under specific conditions.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Andrii Yatsymyrskyi, Alla G. Dyachenko, Elena Ischenko, Tetiana M. Zakharova, Snizhana Gaidai, Vitaliy E. Diyuk, Vladyslav V. Lisnyak
Summary: In this study, the adsorption of carbon dioxide (CO2) on a hydrogenated nickel (111) surface was investigated using density functional theory (DFT). The formation of reaction intermediates, including [HC(OH)(2)], [COOH], [HCOO], and [C(OH)(2)], was observed. The results provide insights into CO2 adsorption on nanoscale nickel metals and can guide the development of efficient gas sensing materials.
MOLECULAR CRYSTALS AND LIQUID CRYSTALS
(2023)
Article
Chemistry, Multidisciplinary
Alla Dyachenko, Olena Ischenko, Vitaliy Diyuk, Olena Goncharuk, Mykola Borysenko, Oleksandr Mischanchuk, Tetiana Zakharova, Olha Pryhunova, Dariush Sternik, Vladyslav Lisnyak
Summary: Silica-based nanocomposites with embedded metal oxides and metallic nanoparticles were prepared and showed high efficiency in catalytic CO2 hydrogenation to methane. The metal oxide modifiers increased the contribution of mesopores to the total porosity of the nanocomposites.
RESEARCH ON CHEMICAL INTERMEDIATES
(2022)
Article
Chemistry, Multidisciplinary
L. Yu Matzui, L. L. Vovchenko, O. A. Syvolozhskyi, O. S. Yakovenko, M. O. Borovoy, O. O. Gomon, A. G. Dyachenko, O. Ischenko, A. V. Vakaliuk, A. Bodnaruk, V. M. Kalita
Summary: The method of salt impregnation was used to grow magnetic alloy nanoparticles on multi-walled carbon nanotubes. The study confirmed that the nanoparticles formed granules on the surface of the nanotubes and exhibited magnetic properties consistent with a small single-domain assembly of spherical particles.
MOLECULAR CRYSTALS AND LIQUID CRYSTALS
(2023)
Article
Materials Science, Multidisciplinary
Olena S. Yakovenko, Ludmila Yu. Matzui, Oleksii A. Syvolozhskyi, Ludmila L. Vovchenko, Oleksandra A. Lazarenko, Olena V. Ischenko, Alla G. Dyachenko, Anna V. Vakaliuk, Victor V. Oliynyk, Volodymyr V. Zagorodnii, Andrii V. Bodnaruk, Viktor M. Kalita, Mykola O. Borovoy
Summary: This paper investigates the structure and microwave properties of epoxy resin composites with graphite nanoplatelets decorated by FeNi nanoparticles prepared by the salt impregnation method. The results show that the decorated composites exhibit excellent conductivity and wide bandwidth absorption properties.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Arsenii Ievtushenko, Oleksii Baibara, Mykola Dranchuk, Oleg Khyzhun, Vitalii Karpyna, Oleksandr Bykov, Oksana Lytvyn, Vasyl Tkach, Volodymyr Baturin, Oleksandr Karpenko
Summary: Transparent and conductive ZnO:Al thin films were grown using reactive magnetron sputtering and layer-by-layer growth method. The films were characterized for their crystalline phase, surface morphology, chemical bonding, and electronic structure. The results showed that the Al content in the ZnO films affected their structure, optical properties, and electronic characteristics.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2023)
Letter
Materials Science, Multidisciplinary
V. G. Kulych, I. P. Fesenko, M. O. Kovtiukh, V. M. Tkach, O. M. Kaidash, Ye. F. Kuzmenko, V. I. Chasnyk, V. V. Ivzhenko
Summary: We measured the thermal conductivity of dense structure of reaction-sintered silicon carbide, a ceramic material produced by impregnating the SiC framework with silicon and then carburizing in liquid phase. The resulting SiC material exhibits a thermal conductivity of 177 W/(m K), which is 36% of the theoretical value.
JOURNAL OF SUPERHARD MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
A. G. Dyachenko, O. Ischenko, M. Borysenko, S. Gaidai, A. Yatsymyrskyi, G. G. Tsapyuk, O. Pryhunova, O. O. Kostyrko
Summary: Effective catalysts for CO2 hydrogenation to methane were prepared by impregnating aluminum oxide with cobalt and iron nitrates. Characterization analysis using XRD, SEM-EDX, argon physisorption, and TPD with mass-spectroscopy revealed that increasing the amount of Co-Fe active mass in the nanocomposite catalyst composition led to higher CO2 conversion and CH4 yield.
THEORETICAL AND EXPERIMENTAL CHEMISTRY
(2022)
Article
Materials Science, Ceramics
T. O. Prikhna, G. D. Ilnytska, O. B. Loginova, V. M. Tkach, V. V. Smokvyna, I. M. Zaitseva, A. P. Zakora
Summary: The study of the effect of heat treatment on the mechanical characteristics and elemental composition of diamonds produced in various growth systems is important. Heat treatment results in the formation of inclusions on the crystal surfaces and the phenomenon of capillary ejection. The deposition of the solvent alloy on the diamond crystal surface leads to crack generation and decreased strength for diamonds with a high content of intracrystalline inclusions.
POWDER METALLURGY AND METAL CERAMICS
(2022)
