Article
Energy & Fuels
Yanshuo Liu, Hui Liu, Xinhe Wang, Xiaolin Ji, Jinjia Wei, Junshe Zhang
Summary: Preparation of high-performance SrFeO3-delta-containing nanocomposites by the Pechini method requires optimization of parameters to achieve the best performance. Different preparation parameters affect specific surface area, methane oxidation processes, and oxygen carrier characteristics.
Article
Nanoscience & Nanotechnology
Sian Chen, Pengju Chen, Junjie Duan, Maolin Chen, Peng Xiao, Yang Li
Summary: The study shows that the bi-layer Yb2Si2O7/SiC coating can significantly improve the oxidation resistance of C-f/SiC samples in high-temperature gas flow environment, delaying the oxidation process. However, after more than 20 thermal cycles, the performance of the coating starts to decrease due to the formation of penetrating cracks.
ADVANCED COMPOSITES AND HYBRID MATERIALS
(2022)
Article
Engineering, Environmental
Xiang Bai, Caixia Zhu, Yierxiati Dilixiati, Xing Fan, Xing-Lei Wang, Miao Du, Zhi-Xiong Huang, Xiao-Yan He, Xing-Long Wu
Summary: In this study, LiCrTiO4 nanoparticles with/without carbon layer were successfully prepared and used as cathodes for hybrid magnesium-lithium ion batteries. The nanoparticles with carbon layer exhibited high reversible capacity, excellent rate performance, and ultra-stable cycling stability. The improved electrochemical performance was attributed to the enhanced conductivity and ion diffusion rate, as well as the decreased polarization value induced by the carbon coating layer with a higher surface area. This study demonstrates a promising application of LCTOC in the fabrication of advanced HMLBs.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Energy & Fuels
Ying Li, Yanan Wang, Kunlei Liu, Haibo Zhao
Summary: This study explores the advantages of Cu/Fe-based composite oxygen carriers in terms of cyclic reactivity and kinetic parameters, providing guidance and optimization methods for the design of low-cost oxygen carriers.
Article
Chemistry, Applied
M. T. Izquierdo, F. Garcia-Labiano, A. Abad, A. Cabello, P. Gayan, L. F. de Diego, J. Adanez
Summary: This study evaluated the stability of a CuO/Al2O3 impregnated oxygen carrier during methane chemical looping combustion at high oxygen carrier to fuel ratios. The research found that low oxygen carrier conversion variation reduced copper loss from particles, but reoxidizing the oxygen carrier at high temperatures was difficult due to the formation of CuAlO2. Operating at temperatures around 800 degrees C with low solid conversion variation is recommended to limit copper loss while maintaining physical stability.
FUEL PROCESSING TECHNOLOGY
(2021)
Article
Engineering, Environmental
Ayesha Idrees, Ali Shan, Muhammad Danish, Waqas Qamar Zaman, Ali Mohsin, Zain Abbas, Jingyao Huang, Tanvir Shahzad, Yong Sun, Zhiqiang Xu, Shuguang Lyu
Summary: This study evaluated the characteristics and catalytic performance of CuFe2O4 synthesized by three different methods, with the solvothermal method showing superior specific surface area and micro-pore volume. The results highlighted the importance of preparation means in determining the catalytic potential of ferrite.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Engineering, Chemical
Young Ku, Chia-Wei Chang, Shr-Han Shiu, Hsuan-Chih Wu, Niels Michiel Moed
Summary: Cupric oxide (CuO) was proven to be a reliable oxygen carrier for chemical looping with oxygen uncoupling (CLOU), showcasing consistent recyclability after 50 redox cycles. The reduction of CuO to generate Cu2O and oxygen was observed to be more efficient at higher temperatures, while the oxidation of Cu2O by air to generate CuO was hindered at elevated temperatures. The reduction rate of CuO/ZrO2 particles increased with temperature and decreased with particle size in a fixed bed reactor, while the activation energies for reduction and oxidation were determined to be 250.6 kJ/mol and 57.6 kJ/mol, respectively.
Article
Chemistry, Multidisciplinary
Pimjai Saengkwamsawang, Kamonchanok Tochat
Summary: In this study, magnesium oxide nanoparticles were synthesized using the sol-gel method with polyvinyl alcohol as the precursor. Characterizations of the MgO crystalline structure, morphology, and optical properties were conducted through various analytical techniques. The MgO nanosheets exhibited an average size of around 25 nm with distinct crystallinity, an estimated optical energy band gap of 3.65-3.75 eV, and blue and green emissions in the photoluminescence spectra.
JOURNAL OF NANOPARTICLE RESEARCH
(2021)
Article
Materials Science, Ceramics
Pengju Chen, Peng Xiao, Zhuan Li, Yang Li, Sian Chen, Junjie Duan, Pingyi Deng
Summary: Ytterbium disilicate and lanthanum zirconate powders were synthesized by solvent gel method. A tri-layer La2Zr2O7/Yb2Si2O7/SiC EBCs was prepared on the surface of C-f/SiC composites, showing better oxidation resistance compared to a bi-layer Yb2Si2O7/SiC coating. The crack deflection phenomenon in the tri-layer coating can largely avoid the formation of penetrating cracks and improve the oxidation resistance of the coating, resulting in only a small amount of coating falling off after corrosion in high-speed and high-temperature gas.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Thermodynamics
Wenbo Zhu, Richard A. Yetter, J. Eric Boyer, Adri C. T. van Duin
Summary: Copper-based chemical-looping combustion is a promising process that utilizes solid carbon fuels. This study investigates the reaction kinetics of different fuels using molecular dynamics simulations and experiments. The results show that the reaction kinetics of different fuels are temperature-dependent and related to the oxygen uncoupling of copper oxide nanoparticles.
COMBUSTION AND FLAME
(2022)
Article
Multidisciplinary Sciences
Wenqing Zhang, Dawei Xi, Yihong Chen, Aobo Chen, Yawen Jiang, Hengjie Liu, Zeyu Zhou, Hui Zhang, Zhi Liu, Ran Long, Yujie Xiong
Summary: A light-driven, chemical looping approach using a Pd/PdO-WO3 nanocomposite has been developed for the synthesis of CH3COOH from methane. By utilizing the active sites on the PdO/Pd-WO3 heterointerface nanocomposite, methane is converted directly to acetic acid without the need for additional reagents. This work provides new insights into intermediate control and offers a promising route for the conversion of methane to oxygenates.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Koji Abe, Yasuhiro Morimoto
Summary: The post-annealing with supplying Zn vapor improved the crystallinity and electrical properties of Al-doped MgxZn1-xO films. Films treated with a Zn cap during post-annealing showed significantly increased resistivity and carrier concentration, with an optical bandgap of 3.41 eV.
MATERIALS RESEARCH EXPRESS
(2021)
Article
Engineering, Environmental
A. Cabello, A. Abad, T. Mendiara, M. T. Izquierdo, L. F. de Diego
Summary: Chemical looping combustion (CLC) allows for the simultaneous combustion of a fuel and the capture of CO2. In this study, tests were conducted in a lab-scale CLC unit using a promising Cu-based oxygen carrier to determine its combustion performance and durability. Operating conditions were carefully selected to maximize the oxygen carrier's durability while achieving complete CH4 combustion. The results showed that the Cu-based oxygen carrier exhibited excellent mechanical resistance, making it suitable for continuous CLC operation at 900 degrees C.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Construction & Building Technology
Rafael Zarzuela, M. L. Almoraima Gil, Jesus Carretero, Maria Carbu, Jesus M. Cantoral, Maria J. Mosquera
Summary: The new type of engineered stone developed using a CuO/SiO2 nanocomposite matrix synthesized via sol-gel as a binder and quartz particles of different grain size as aggregate, presents anti-fungal properties, high surface hardness, thermal resistance, and appropriate impact resistance. The proportion of CuO in the matrix and water content modify the sol-gel kinetics and quartz sedimentation, affecting the structure and mechanical properties.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Review
Energy & Fuels
Feng Liu, Jing Liu, Yingju Yang
Summary: This article reviews the application of density functional theory (DFT) in understanding the mechanisms for oxygen carrier development during chemical-looping combustion (CLC). The reactivity and detailed reaction mechanism of oxygen carriers are summarized, and the interaction between various components and the synergy in oxygen carriers are revealed. Emphasis is placed on DFT calculations to understand and predict variations in reactivity from one oxygen carrier to another, as well as to evaluate and screen oxygen carriers with appropriate properties.
Article
Materials Science, Ceramics
Grigory B. Veselov, Ekaterina V. Ilyina, Aleksey A. Vedyagin
Summary: The present research aims to develop an efficient system for olefins production via dehydrogenation of corresponding alkanes, considering the uptake of released hydrogen by oxygen carrier systems. MgO-based aerogel composites consisting of Pd-Mg-O component and M-Mg-O (M = Ni, Cu, Fe) component were prepared and characterized, and their reproducibility towards hydrogen uptake in consecutive redox cycles was studied using the temperature-programmed reduction method.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
A. T. Matveev, K. L. Firestein, A. S. Konopatsky, I. N. Volkov, D. V. Leybo, A. P. Koskin, A. A. Vedyagin, D. V. Golberg, P. B. Sorokin, D. V. Shtansky
Summary: A new simple and scalable method for synthesizing nanocrystalline Pt-containing hexagonal boron oxynitride (Pt/BN(O)) is proposed. Pt is present only in the form of single atoms (SAs) and clusters at a minimum content of 0.0085 wt%. This sample shows high catalytic activity for CO oxidation with a specific CO2 productivity as high as 176 molCO2/gPt/h at 300 degrees C, and it retains its activity after four cycles.
Article
Engineering, Chemical
A. V. Pervikov, A. V. Pustovalov, S. D. Afonnikova, Y. I. Bauman, I. V. Mishakov, A. A. Vedyagin
Summary: For the first time, nanoparticles composed of Ni, Cu (6-27 at.%) and Al (6-24 at.%) were produced through a joint electrical explosion of dissimilar wires. The specific surface area ranges were 7.7 to 12.8 m2/g for NiCu and 3.6 to 7.1 m2/g for NiAl. The crystal structure of the nanoparticles corresponded to solid solutions. In the catalytic pyrolysis of C2-C4 hydrocarbons for carbon nanofiber (CNF) production, it was discovered that the addition of Al and Cu in concentrations up to 20 at.% significantly increased the productivity of Ni-based catalysts. The specific yield of CNF (YC) increased by almost 4 times for the NiAl series (from 8.7 to 32 g/gNi, sample Ni91Al9); the addition of Cu raised the carbon yield value by 14 times (YC = 123 g/gNi, sample Ni85Cu15).
Article
Chemistry, Physical
Grigory B. Veselov, Vladimir O. Stoyanovskii, Svetlana V. Cherepanova, Aleksey A. Vedyagin
Summary: In this work, Co-Mg-O oxide systems were prepared via a sol-gel technique and characterized at different cobalt loading levels. The interaction between cobalt and MgO resulted in the formation of a solid solution, and this interaction became stronger as the cobalt loading increased. Each reduction/oxidation cycle caused a portion of cobalt to emerge from the solid solution. The sample prepared with ammonia exhibited the highest stability in catalytic runs.
REACTION KINETICS MECHANISMS AND CATALYSIS
(2023)
Article
Chemistry, Applied
Sofya D. Afonnikova, Ilya Mishakov, Yury Bauman, Mikhail Trenikhin, Yury Shubin, Alexandra N. Serkova, Aleksey A. Vedyagin
Summary: The synthesis of microdispersed alloy Ni0.89Cu0.11 by mechanochemical alloying of metal powders and its catalytic properties in the decomposition of ethylene were investigated. The study provides insights into the morphology and phase composition of the alloy, as well as its catalytic performance. This research is significant for the development of effective catalytic systems for the synthesis of carbon nanomaterials by catalytic pyrolysis.
TOPICS IN CATALYSIS
(2023)
Article
Chemistry, Physical
Svetlana Cherepanova, Ekaterina Kozlova
Summary: This study analyzed the crystalline structure and particle shape of Cd1-xMnxS (x similar to 0.3) in composite photocatalysts prepared by hydrothermal synthesis at different temperatures (T = 80, 100, 120, and 140 degrees C). The catalysts contained mixed Cd-Mn sulfide and a small amount of beta-Mn3O4. The XRD patterns showed features of both cubic zinc blende and hexagonal wurtzite structures, with anisotropically broadened peaks. A heterogeneous model was initially considered but proved incorrect, and a homogeneous model with lamellar intergrowth of zinc blende and wurtzite modifications was found to be more accurate. The synthesis temperature affected particle size, probability of stacking faults, and the transformation of the nanoparticle structure.
Article
Chemistry, Organic
M. R. Agliullin, S. V. Cherepanova, R. Z. Kuvatova, A. V. Faizullin, L. M. Khalilov, B. I. Kutepov
Summary: AlPO-11 molecular sieves with high phase purity, various crystal morphologies and dispersities, and distinctive secondary pore structures can be synthesized by crystallizing aluminophosphate gels prepared using boehmites of different crystal sizes and pore structure characteristics as the aluminum source and aging them at different temperatures.
PETROLEUM CHEMISTRY
(2023)
Article
Chemistry, Physical
Sergey A. Gromilov, Anatoly I. Chepurov, Alexander M. Volodin, Aleksey A. Vedyagin
Summary: The possible impact of the carbon shell in core-shell materials of C12A7@C type on the solid-state reactions of mayenite with graphite and magnesium oxide under high pressure, high temperature conditions were investigated. The results showed that the interaction of mayenite with graphite resulted in the formation of an aluminum-rich phase of CaO·6Al2O3 composition, while the same interaction in the case of core-shell structure did not lead to the formation of such a phase. The main product of the interaction of mayenite and C12A7@C with MgO was the spinel phase Al2MgO4.
Article
Chemistry, Physical
Tatiana N. Rostovshchikova, Marina I. Shilina, Konstantin I. Maslakov, Sergey A. Gurevich, Denis A. Yavsin, Grigory B. Veselov, Vladimir O. Stoyanovskii, Aleksey A. Vedyagin
Summary: In this study, Pd particles were deposited on the surface of ZSM-5 zeolite grains using laser electrodispersion to obtain Pd/ZSM-5 materials for low-temperature hydrocarbon trapping. It was found that the thermal stability was improved, and Pd underwent oxidation and migrated into the zeolite's channels during thermal aging, enhancing the trapping of hydrocarbons.
Article
Chemistry, Physical
Anton A. Popov, Sofya D. Afonnikova, Andrey D. Varygin, Yury I. Bauman, Mikhail V. Trenikhin, Pavel E. Plyusnin, Yury V. Shubin, Aleksey A. Vedyagin, Ilya V. Mishakov
Summary: The development of new heterogeneous Pt-containing catalysts has remained relevant over the past decades. This paper presents a method for producing metal-carbon composites, Pt1-xNix/CNF, with a tunable Pt/Ni ratio. The composites consist of Pt1-xNix (x = 0.0-1.0) nanoparticles embedded within a carbon nanofiber (CNF) structure. The synthesis involves the spontaneous disintegration of Pt1-xNix alloys in an ethylene-containing atmosphere, resulting in the formation of CNF. The study also investigates the impact of Ni content on the activity of Pt1-xNix alloys in ethylene decomposition, revealing an increase in efficiency with higher Ni concentration. Additionally, the synthesized Pt1-xNix/CNF composites exhibit superior activity compared to the Pt/Vulcan commercial catalyst in the electrochemical hydrogen evolution reaction.
Article
Polymer Science
Marat R. Agliullin, Svetlana V. Cherepanova, Zulfiya R. Fayzullina, Dmitry V. Serebrennikov, Leonard M. Khalilov, Tatyana R. Prosochkina, Boris I. Kutepov
Summary: This article reports the formation of silicoaluminophosphate gels under changing gel aging conditions and the influence of boehmite, an aluminum source, with different properties. The characterization of the initial gels and crystallization products was conducted using various techniques such as XRF, X-ray diffraction, MAS NMR Al-27 and P-31, SEM, N-2 physical adsorption, and IR spectroscopy. The results showed that the chemical and phase composition of aging gels and crystallization products were influenced by the size of boehmite crystals and its porous structure. Furthermore, methods for controlling the morphology and secondary porous structure of SAPO-11 catalyst were proposed based on the use of boehmite with different properties and altering the aging conditions of initial gels. SAPO-based catalysts with a hierarchical porous structure exhibited excellent catalytic performance in the dimerization of alpha-methylstyrene, with high conversion and selectivity for linear isomers.
Review
Chemistry, Physical
Grigory B. Veselov, Aleksey A. Vedyagin
Summary: This review provides an overview of the synthesis and structural tuning strategies of carbon xerogels, including the influence of sol-gel synthesis conditions, the possibility of using different precursors for organic aerogel preparation, optimization of gel drying and pyrolysis conditions, and surface modification of carbon xerogels by introducing various functional groups and heteroatoms. Furthermore, the methods for preparing metal-doped carbon xerogels and their potential applications are briefly mentioned.
Article
Chemistry, Physical
Aleksey N. Chernov, Svetlana V. Cherepanova, Evgeny Yu. Gerasimov, Igor P. Prosvirin, Galina A. Zenkovets, Alexei A. Shutilov, Anna S. Gorbunova, Konstantin Yu. Koltunov, Vladimir I. Sobolev
Summary: Non-oxidative propane dehydrogenation (PDH) is an important method for propylene production. Recent studies have shown that cobalt-containing catalysts have great potential in this process and can achieve efficiencies comparable to platinum- and chromium-based catalytic systems. This study investigated the active sites of cobalt aluminates (CoAl2O4-Al2O3) responsible for PDH and found that cobalt oxide forms tightly covering alumina or embedded in the spinel structure are the most likely catalytic sites for this reaction. Further research is needed to understand the role of surface oxygen vacancies in enhancing the catalytic activity.
Article
Chemistry, Multidisciplinary
Angelina V. V. Zhurenok, Danila B. B. Vasichenko, Semen N. N. Berdyugin, Evgeny Yu. Gerasimov, Andrey A. A. Saraev, Svetlana V. V. Cherepanova, Ekaterina A. A. Kozlova
Summary: Photocatalysts based on graphite-like carbon nitride with a low content of noble metals (Pd, Rh) were proposed for hydrogen evolution under visible light. Reduction of precursor complexes [Rh-2(H2O)(8)(& mu;-OH)(2)](NO3)(4)& BULL;4H(2)O and (Et4N)(2)[Pd(NO3)(4)] at 400 & DEG;C gave metallic particles. The synthesized photocatalysts were characterized and tested for hydrogen evolution, showing high activity for the 0.01-0.5% Rh/g-C3N4 series and the most efficient use of metal particles in the 0.1% Rh/g-C3N4 photocatalyst.
