Article
Engineering, Chemical
Sanaz Daneshmand-Jahromi, Davood Karami, Nader Mahinpey
Summary: This research investigates the effect of different aerogel supports on the stability of copper oxide during chemical looping combustion (CLC) and finds that zirconia aerogel support plays a significant role in improving the activity of oxygen carriers. Proper supports can stabilize Cu dispersion, intensify the redox degree of oxygen carriers at high temperatures, and strengthen the distribution of Cu on the support surface.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Chemistry, Physical
Aggeliki Papavasiliou, Benedetta Oliani, Mirko Scanferla, Elias Sakellis, Antonella Glisenti, Paolo Canu, Fotis K. Katsaros
Summary: Mesoporous multicomponent materials based on alumina are synthesized through a facile evaporation-induced-self-assembly method. The addition of citric acid is found to be crucial in obtaining high mesoscopic order and notable homogeneity. After thermal aging, the distribution of metal oxides and nanoporous nature are well-preserved, with a parallel nucleation of ceria nanoparticles into the semi-crystalline framework. The catalytic activity is drastically enhanced, especially for the Cu-Ce-Al system, due to the material's structural reconstruction and its effect on metal-support interaction.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Piotr Kobedza, Aleksandra Smejda-Krzewicka, Krzysztof Strzelec
Summary: The study confirmed the ability to cross-link chloroprene rubber using copper oxides, showing that copper oxides can effectively cross-link CR and improve the properties of vulcanizates. The type and amount of copper oxides used affect the degree of cross-linking and the characteristics of the vulcanizates.
Review
Chemistry, Physical
Bishnu Choudhary, Laxmidhar Besra, Sharmistha Anwar, Shahid Anwar
Summary: The development of efficient and environmentally-friendly technology is crucial for addressing the energy and environmental crisis. Solid oxide cells (SOCs) have broad applications in energy conversion devices, hydrogen production, natural gas upgrading, and green synthesis, among others.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Engineering, Chemical
Olle Rodrigue Kam, Corneille Bakouan, Inoussa Zongo, Boubie Guel
Summary: Thallium (I) was efficiently removed from aqueous solution using gamma-alumina nanoparticles as nano adsorbents. The adsorption process was optimized by varying experimental conditions such as adsorbent dose, agitation time, initial concentration, pH, and temperature. The results showed that the removal efficiency was highest at pH around 8, and the adsorption mechanism followed pseudo-second-order kinetics and Freundlich isotherm. Thermodynamic investigations revealed that the adsorption was spontaneous and exothermic, with physisorption dominating. The diffusion model suggested the involvement of both surface spread and intraparticle diffusion in the sorption process.
Article
Chemistry, Multidisciplinary
Danusorn Kiatsaengthong, Kanticha Jaroenpanon, Pooripong Somchuea, Thanaphat Chukeaw, Metta Chareonpanich, Kajornsak Faungnawakij, Hiesang Sohn, Guenther Rupprechter, Anusorn Seubsai
Summary: This study investigated lanthanum oxide catalysts promoted with alkaline-earth metal oxides for the oxidative coupling of methane (OCM). The results showed that La-Sr and La-Ba catalysts performed well, with high C2+ yield and selectivity. In contrast, the combination of La with Ca or Mg did not lead to significant improvement in yield. The activity of the catalysts was strongly related to moderate basic sites and surface-adsorbed oxygen species of O-2(-), and they exhibited good stability under high-temperature conditions.
Article
Materials Science, Ceramics
M. K. G. Abbas, S. Ramesh, K. Y. Sara Lee, Y. H. Wong, C. Y. Tan, U. Johnson Alengaram, P. Ganesan, Farayi Musharavati, Erfan Zalnezhad
Summary: The effect of copper oxide doping on the densification, microstructure evolution, and mechanical characteristics of alumina toughened zirconia ceramic composites was investigated. The addition of 0.2 wt% copper oxide improved densification and mechanical properties without affecting the phase stability, while higher dopant levels were detrimental to the material.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Physical
Alfred Worrad, Sagar Sourav, Stavros Caratzoulas, Dionisios G. Vlachos
Summary: The structure of supported MoOx/Al2O3 catalysts was investigated using AIMD and DFT. Phase diagrams were computed to understand the hydroxylation coverage under different conditions. The results showed that DFT is a cost-effective method for computing vibrational frequencies under certain hydrated conditions, but is susceptible to errors under dehydrated conditions. The power spectra of individual hydroxyls revealed a strong relationship between OH stretching frequencies and the surrounding coordination environment and MoOx anchoring location.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Construction & Building Technology
Juan Yu, Haemin Song, Dongho Jeon, Sungwon Sim, Dohoon Kim, Hwan Lee, Seyoon Yoon, Woo Sung Yum, Jae Eun Oh
Summary: This study investigated the influence of adding nano-alumina on the crystallinity and interaction in a CaO-activated GGBFS binder system. The results showed that gamma-alumina significantly increased the dissolution of Si and C-S-H formation compared to alpha-alumina, leading to a faster and greater strength increase.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Diksha Choudhary, Deepika Tavar, Pardeep Singh, Pankaj Raizada, Mohammad Ashiq, Avanish Kumar Srivastava, Archana Singh
Summary: This study synthesized nano-gamma Al-Mn-O to remove As(III) and fluoride from groundwater. The results showed that the synthesized material had a good removal capacity.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Chemistry, Applied
Inaki Adanez-Rubio, Amanda Nilsson, Maria Teresa Izquierdo, Teresa Mendiara, Alberto Abad, Juan Adanez
Summary: The addition of kaolin significantly improved the mechanical strength of Cu-Mn oxygen carrier and increased its lifetime to 19,000 hours, but at the cost of decreased reactivity. Optimization of the kaolin fraction in the oxygen carrier is necessary to balance these effects.
FUEL PROCESSING TECHNOLOGY
(2021)
Article
Chemistry, Physical
Huan Wang, Roman Schmack, Sergey Sokolov, Evgenii V. Kondratenko, Aliaksei Mazheika, Ralph Kraehnert
Summary: The selection of catalysts for the oxidative coupling of methane (OCM) is summarized in this study. It is found that catalysts with thermodynamically stable carbonate and thermally stable oxide support exhibit good catalytic performance. Experimental correlations between carbonate decomposition temperature and C-2 yield suggest the importance of CO2 adsorption and surface carbonates in selective methane conversion.
Article
Environmental Sciences
Mohamed E. Khidr, Tamer F. Megahed, Shinichi Ookawara, Ahmed E. Elwardany
Summary: This investigation examines the effects of biodiesel blends and aluminum/copper oxide nano additives on the performance of a compression ignition engine. The study finds that a 10% blend of biodiesel (B10) results in a minimal increase in fuel consumption and lower emissions. Optimal concentrations of aluminum and copper oxide nano additives lead to a reduction in fuel consumption and improved combustion. Additionally, alumina/biodiesel blend shows a significant reduction in emissions.
ATMOSPHERIC POLLUTION RESEARCH
(2023)
Article
Chemistry, Physical
Yibo Yang, Gaolei Qin, Anping Yin, Yuhang Cai, Ziyu Zhou, Nengfeng Gong, Xiangjie Zhang, Tao Yan, Gengzhe Song, Xiaodong Sun, Hongliu Wan, Yong Yang, Yongwang Li, Zhi Cao
Summary: In this study, the sluggish reaction rates of the cross-metathesis of ethene and 2-butene to produce propene over a supported rhenium-based catalyst were improved through electronic modulation and selective adsorption of olefins. The boron-modified Re-2B/Al2O3 catalyst exhibited superior intrinsic activity, resulting in over 19-fold increase in propene yield compared to the un-promoted Re-Al2O3 catalyst.
CATALYSIS SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Physical
Natalie M. Stuart, Karl Sohlberg
Summary: Determining the energy of a solid surface is crucial for understanding its potential utility in chemical processes. The standard method of calculating surface energy works for symmetric slabs but falls short when dealing with asymmetric slabs due to inaccurate assumptions. Previous attempts to determine individual surface energy contributions have similar limitations. This study presents a novel technique that calculates the total energy of a slab using density-functional-theory calculations and solves equations for individual surface energy contributions, showing improvement in precision, consistency, and additional information about frozen surfaces.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
