Article
Materials Science, Multidisciplinary
G. C. Pandey, D. Gangwar, H. Tripathi, G. Aquilanti, Chandana Rath
Summary: The crystal and local structures of NiCr2-xFexO4 spinels synthesized by a co-precipitation method were examined using XRD, XANES, and EXAFS techniques. With increasing x, the occupancy of Ni cations in the A site decreased, leading to an increase in the Curie temperature TC of the paramagnetic to long-range ferrimagnetic transition. The dominance of A-B exchange interaction over B-B exchange interaction, confirmed by changes in bond lengths and angles from structural analysis, contributes to the observed behaviors.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Chemistry, Applied
Mohammad Mehrbod, Michela Martinelli, Jonathan D. Castro, Nour Alhraki, Donald C. Cronauer, A. Jeremy Kropf, Christopher L. Marshall, Gary Jacobs
Summary: Direct reduction of cobalt nitrate using alumina showed differences in reducibility and Co crystallite size compared to traditional calcination/reduction treatment. Noble metals improved cobalt oxide reducibility, especially in the final reduction step. The best performance was achieved with direct reduction of uncalcined 0.5% Pt-25%Co/Al2O3.
Article
Biochemistry & Molecular Biology
Gabriela Jajko, Pawel Kozyra, Maciej Strzempek, Paulina Indyka, Marcin Zajac, Stefan Witkowski, Witold Piskorz
Summary: This article presents the results of computational structural studies on Al-containing zeolites, using periodic DFT + D modelling and FDMNES for XAS simulations, and verifying with EXAFS spectroscopy and PXRD. The applicability of RDF to screen out the postulated zeolite structure is also discussed, with further verification by HR-TEM imaging.
Article
Energy & Fuels
Ling-Wei Wei, Kuen-Song Lin, H. Paul Wang
Summary: This study demonstrates the effective conversion of H2O(l)-to-H2O2(aq) and -H-2(g) using the novel Pd-TiO2-delta/TiO2 photocatalysts through photocatalytic reactions. The results show that this photocatalyst can efficiently generate green energy under solar energy.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Chemistry, Physical
Magali S. Ferrandon, Carly Byron, Gokhan Celik, Yuying Zhang, Chaoying Ni, Jennifer Sloppy, Rachel A. McCormick, Karl Booksh, Andrew Teplyakov, Massimiliano Delferro
Summary: In this study, a large number of different combinations of catalysts were synthesized using a high-throughput method. Evaluation revealed that the type of oxide support has a significant impact on the activity and stability of the catalysts, and the optimal effects of different metal promoters on various metal oxide supports varied.
APPLIED CATALYSIS A-GENERAL
(2022)
Article
Chemistry, Applied
Arturo Claudio-Piedras, Rosa Ma. Ramirez-Zamora, Brenda C. Alcantar-Vazquez, Albina Gutierrez-Martinez, Gilberto Mondragon-Galicia, Fernando Morales-Anzures, Raul Perez-Hernandez
Summary: The study synthesized Pt nanocatalysts supported on CeO2-NR for hydrogen production via the steam reforming of methanol. The choice of Pt precursor had an impact on the catalyst's performance, with Pt/CeO2-NR(Nit) showing the best methanol conversion rates. The stability of the catalyst during the reaction was confirmed by real-time monitoring analysis using Mass Spectroscopy.
Article
Chemistry, Physical
Noel Essey N'Guessan, Emmanuel Joussein, Alexandra Courtin-Nomade, Erwan Paineau, Marilyne Soubrand, Olivier Grauby, Valentin Robin, Coelho Diogo Cristina, Delphine Vantelon, Pascale Launois, Patrice Fondaneche, Sylvie Rossignol, Nathalie Texier-Mandoki, Xavier Bourbon
Summary: This study investigates the dissolution mechanisms of kaolinite particles in alkaline media through aluminum and silicon leaching, revealing the impact of crystallinity and cations on reactivity. The results show that poorly crystallized kaolinites have higher dissolution rates, and the nature of the cation significantly affects the degree of dissolution, suggesting different mechanisms depending on the cations, such as uniform dissolution from edges in the presence of KOH and oriented edges dissolution with NaOH.
APPLIED CLAY SCIENCE
(2021)
Article
Engineering, Environmental
Dina G. Nevidomskaya, Tatiana M. Minkina, Alexander Soldatov, Tatiana Bauer, Victoria A. Shuvaeva, Yan Zubavichus, Alexander L. Trigub, Saglara S. Mandzhieva, Pavel Dorovatovskii, Yuri Popov
Summary: The study revealed that in highly contaminated soils, Zn and Cu primarily exist in the form of Me-S and Me-O bonds. As the extraction stages progress, the number of compounds with higher solubility decreases, indicating that the residual fractions may contain some of the most stable and hard-to-recover metal compounds originating from technogenic activities.
ENVIRONMENTAL GEOCHEMISTRY AND HEALTH
(2021)
Article
Engineering, Environmental
Marina Burachevskaya, Tatiana Minkina, Saglara Mandzhieva, Tatiana Bauer, Dina Nevidomskaya, Victoria Shuvaeva, Svetlana Sushkova, Ridvan Kizilkaya, Coskun Gulser, Vishnu Rajput
Summary: This study investigated the influence of CuO nanoparticles on soil and plants, revealing that nanosized CuO undergoes stronger transformation and higher toxicity, leading to negative effects on the growth of spring barley.
ENVIRONMENTAL GEOCHEMISTRY AND HEALTH
(2021)
Article
Chemistry, Applied
G. Modragon-Galicia, M. Toledo Toledo, F. Morales-Anzures, P. Salinas-Hernandez, A. Gutierrez-Martinez, Ma. E. Fernandez Garcia, F. Tzompantzi, A. Barrera, J. Reyna-Alvarado, O. A. Lopez-Galan, M. Ramos, R. Perez-Hernandez
Summary: A study on the catalytic performance of Pt/Pd supported on ZnO rods for methanol steam reforming reaction (MSR) was conducted. The experimental and theoretical results showed that Pt/ZnO sample exhibited superior catalytic activity, and the stabilization of PdZn structure by Pt might be attributed to better catalytic performance due to the electron transfer from platinum into the zinc oxide support.
TOPICS IN CATALYSIS
(2022)
Article
Polymer Science
Dimitrios Katsigiannopoulos, Eftychia Grana, Konstantina Tsitoni, Ioannis Moutsios, Gkreti-Maria Manesi, Evgeniia A. Nikitina, Nikolaos Chalmpes, Dimitrios Moschovas, Dimitrios Gournis, Dimitri A. Ivanov, Apostolos Avgeropoulos
Summary: A novel approach to obtaining nanocomposite materials using anionic sequential polymerization and post-synthetic esterification reactions with chemically modified graphene sheets (CMGs) has been reported. The synthesized polystyrene-b-poly(isoprene)-g-CMGs exhibited enhanced physicochemical properties, with the structure/properties relationship justified through transmission electron microscopy. The arrangement of CMGs utilizing lamellar and cylindrical morphologies was studied to determine their effect in the adopted topologies.
Article
Chemistry, Applied
Parinya Tangpakonsab, Alexander Genest, Jingxia Yang, Ali Meral, Bingjie Zou, Nevzat Yigit, Sabine Schwarz, Guenther Rupprechter
Summary: CuO/CeO2 nanosphere catalysts were synthesized and tested for CO oxidation and preferential oxidation of CO (PROX) in excess H-2. The catalytic performance was independent of the initial oxidation state of the catalyst (CuO vs. Cu-0), suggesting the formation of the same active phase under reaction conditions. Density functional modeling was applied to understand the intermediate steps of CO oxidation and H-2 transformation.
TOPICS IN CATALYSIS
(2023)
Article
Chemistry, Physical
Hao Wang, Jiangwen Liao, Jiajun Zhong, Yunpeng Liu, Lei Yao, Lixiong Qian, Yuecheng Lai, Xin Wang, Yikun Li, Jianxin Song, Xueqing Xing, Guang Mo, Zhongjun Chen, Zhonghua Wu
Summary: This paper thoroughly discusses the evolution of the Ni atom coordination structure in the synthesis of Ni single atom catalyst using graphitic carbon nitride as a support. The results reveal a three-stage process in which the coordination configurations change as the temperature increases. The findings are further confirmed by simulations and calculations.
Article
Instruments & Instrumentation
Andreas C. Scheinost, Juergen Claussner, Joerg Exner, Manuel Feig, Stefan Findeisen, Christoph Hennig, Kristina O. Kvashnina, Damien Naudet, Damien Prieur, Andre Rossberg, Moritz Schmidt, Canrong Qiu, Patrick Colomp, Cedric Cohen, Eric Dettona, Vadim Dyadkin, Thorsten Stumpf
Summary: ROBL-II at the new EBS storage ring of ESRF provides four experimental stations for the investigation of actinide and other alpha- and beta-emitting radionuclides in an energy range of 3 to 35 keV. These stations include XAFS and XES for X-ray absorption and emission spectroscopy, XRD-1 for high-resolution powder diffraction and surface-sensitive techniques, and XRD-2 for single crystal and powder diffraction experiments. Elaborate radioprotection features enable safe exchange of samples between the stations for a combination of methods in actinide and environmental research.
JOURNAL OF SYNCHROTRON RADIATION
(2021)
Article
Chemistry, Physical
Hamed Yousefzadeh, Selmi E. Bozbag, Vitaly Sushkevich, Jeroen A. van Bokhoven, Can Erkey
Summary: Copper-exchanged mordenite prepared by supercritical ion exchange and aqueous ion exchange were investigated for methane conversion to methanol. Increasing the oxygen activation temperature and methane reaction time enhanced the methanol yield of copper-exchanged mordenite prepared by supercritical ion exchange. The reducibility of copper-exchanged mordenite prepared by supercritical ion exchange was compared with those prepared by aqueous ion exchange using H-2-TPR.
CATALYSIS COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Yifan Sun, Ye Lv, Wei Li, Jinli Zhang, Yan Fu
Summary: In this study, PtRu electrocatalysts were fabricated on carbon paper via cyclic electrodeposition for the electrocatalytic hydrogenation (ECH) of phenol. The Pt3Ru3 catalyst exhibited excellent activity and stability for the conversion of phenol to cyclohexanol at ambient temperature and various current densities. The in situ Raman spectroscopy and kinetic study revealed the hydrogenation mechanism of phenol over Pt3Ru3 in acidic electrolyte, providing an effective electrochemical strategy for the facile construction of durable electrode materials and efficient phenol hydrogenation.
JOURNAL OF CATALYSIS
(2024)
Article
Chemistry, Physical
Amir Shahzad, Khezina Rafiq, Muhammad Zeeshan Abid, Naseem Ahmad Khan, Syed Shoaib Ahmad Shah, Raed H. Althomali, Abdul Rauf, Ejaz Hussain
Summary: Photocatalytic hydrogen production through water splitting is an effective method for meeting future energy demands. In this study, researchers synthesized a 1 % Ag2S/Cu2S co-doped CdZnS catalyst and found that it can produce hydrogen at a higher rate. The co-doping of Ag2S and Cu2S in the CdZnS catalyst showed a synergistic effect, with Ag2S promoting oxidation reactions and Cu2S promoting reduction reactions.
JOURNAL OF CATALYSIS
(2024)