Article
Biochemistry & Molecular Biology
Mihail Mihaylov, Elena Ivanova, Videlina Zdravkova, Stanislava Andonova, Nikola Drenchev, Kristina Chakarova, Radoslav Kefirov, Rositsa Kukeva, Radostina Stoyanova, Konstantin Hadjiivanov
Summary: This study explores the potential of Cu/ZSM-5 as an adsorbent for the purification of hydrogen from CO. The results show that Cu/ZSM-5 has high selectivity for CO adsorption. The samples prepared by different methods, aqueous solution cation exchange and solid-state exchange, exhibit different Cu ion contents, but both demonstrate good CO adsorption performance. The findings of this study are significant for hydrogen purification.
Article
Nanoscience & Nanotechnology
Gabriele Deplano, Matteo Signorile, Valentina Crocella, Natale Gabriele Porcaro, Cesare Atzori, Bjorn Gading Solemsli, Stian Svelle, Silvia Bordiga
Summary: Cu-exchanged zeolites are important materials in industrial processes, and this study presents a novel technique for quantitatively studying Cu redox speciation in these materials. By using isothermal volumetric adsorption measurements and infrared spectroscopy, a good correlation between results is found, allowing for spectrophotometric quantification. This complementary set of tools provides good sensitivity and precision in quantitatively studying Cu redox speciation at the laboratory scale.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Applied
Zoya N. Lashchinskaya, Anton A. Gabrienko, Alexander G. Stepanov
Summary: The transformation of propene on copper-modified ZSM-5 zeolite has been investigated using 13C MAS NMR and FTIR spectroscopy. Two major reaction pathways, namely aromatization to benzene and toluene, and oxidation to acrolein, have been identified. Copper-allyl species are found to be key intermediates in both processes. The role of different active sites, including Cu2+-O2- Lewis acid-base pairs and [Cu3(mu-O)3]2+ oxo-clusters, in the formation of allylic species and the oxidation of copper-allyls has been established. The obtained results are important for the development of zeolite-based catalysts for propene aromatization to simple aromatic compounds and the partial oxidation to acrolein.
MICROPOROUS AND MESOPOROUS MATERIALS
(2023)
Article
Chemistry, Physical
Diyu Zhang, Charlotte Jansen, Otto T. Berg, Joost M. Bakker, Joerg Meyer, Aart W. Kleyn, Ludo B. F. Juurlink
Summary: This study investigates the coadsorption of oxygen and carbon monoxide on Cu(111) as a preliminary step to studying CO2 dissociation. The results show that the adsorption of oxygen affects the adsorption of CO, indicating the mechanism of surface oxidation. The findings provide valuable insights for understanding CO2 dissociation.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Haocheng Xiong, Qiwen Sun, Kedang Chen, Yifei Xu, Xiaoxia Chang, Qi Lu, Bingjun Xu
Summary: Researchers have developed a method to determine the standard adsorption enthalpy of CO on Cu surfaces using quantitative surface enhanced infrared absorption spectroscopy. The results show that on dendritic Cu at -0.75 V vs. SHE, the standard adsorption enthalpy, entropy and Gibbs free energy are 1.5 kJ mol(-1), 37.9 J/(mol K), and -9.8 kJ mol(-1), respectively. Comparison between oxide-derived Cu and dendritic Cu suggests the presence of stronger binding sites on OD Cu, which could favor multicarbon products. This work will help establish the correlation between CO binding energy and CO(2)RR activity.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Physical
Md Raian Yousuf, Eric M. Johnson, Andrew J. Maynes, Cooper R. Johnston, Ayman M. Karim, Amanda J. Morris, John R. Morris, Diego Troya
Summary: Recent experiments have studied the catalytic properties of single transition metal atoms supported on metal-organic frameworks (MOF), specifically focusing on the role of transition metal oxidation states and the reaction mechanism. In this study, the aerobic CO oxidation reaction on single Cu atoms supported on UiO-66 MOF was investigated. Experimental characterization and quantum mechanical calculations revealed the presence of both Cu(I) and Cu(II) oxidation states and showed that the CO oxidation reaction can proceed through multiple different mechanisms. The results suggest that CO oxidation on Cu(II)@UiO-66 is predicted to be faster than on Cu(I), indicating the potential for more efficient catalytic processes.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Analytical
Iqra Shahid Arain, Moina Akhtar Mughal, Aamna Balouch, Nasira Liaquat Rajput, Nasreen Channa, Samra Qaimkhani, Sobia Arain, Saddam Hussain Bughio, Nusrat Naeem Memon
Summary: This study reports a newly prepared Schiff base and its resin, which was encapsulated with metal nanoparticles for the removal of Cu(II) ions from water.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Physical
Xinwei Ye, Ramon Oord, Matteo Monai, Joel E. Schmidt, Tiehong Chen, Florian Meirer, Bert M. Weckhuysen
Summary: This study investigates the surface changes of Cu-ZSM-5 zeolite catalyst in the NH3-SCR reaction using in situ spectroscopy. It is found that Cu2+ forms complexes with NH3 at low temperatures and facilitates the reaction by forming high coverage nitrate intermediates. After steam treatment, [Cu-x(OH)(2x-1)](+) oligomers/clusters accumulate on the Cu-ZSM-5 surface, strongly adsorbing NH3 and nitrates/nitric acid at low temperatures, limiting the reaction. Additionally, NH3 and nitrates/nitric acid compete for shared adsorption sites, and selective tuning is achieved by prompt removal of nitrates/nitric acid with NO.
CATALYSIS SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Physical
Hongyan Xue, Xiaoming Guo, Tao Meng, Dongsen Mao, Zhen Ma
Summary: M/ZSM-5 (M = Mn, Co, Cu) samples were prepared by impregnation and their catalytic performance in NH3-SCR of NO was tested. Cu/ZSM-5 exhibited the highest activity, followed by Mn/ZSM-5, and Co/ZSM-5 was the least active. In-situ DRIFTS analysis revealed the nature and evolution of surface species. Coordinated NH3, NH4+, and amide (-NH2) species derived from NH3 adsorption were found to be relevant for NH3-SCR, while bridged nitrate species derived from NOx adsorption were identified as the main active species. Bridged nitrate was more abundant and thermally more stable on Cu/ZSM-5, consistent with its higher activity compared to Mn/ZSM-5 and Co/ZSM-5. Different mechanisms, including Eley-Rideal and Langmuir-Hinshelwood, were observed for Mn/ZSM-5 at different temperatures, while both pathways coexisted for Co/ZSM-5 and Cu/ZSM-5.
SURFACES AND INTERFACES
(2022)
Article
Nanoscience & Nanotechnology
Jinback Kang, Yu Jin Kim, Dongjin Kim, Kyuseok Yun, Myungwoo Chung, Thanh Huu Nguyen, Su Yong Lee, Kyung Byung Yoon, Hyunjung Kim
Summary: Investigating the chemical adsorption of hydrocarbons on Cu-ZSM-5 crystals reveals how the interactions between hydrocarbons and Cu2+ sites affect the internal lattice structure of the zeolite. Different hydrocarbons induce lattice strain through diverse chemical adsorption effects, providing valuable insights for zeolite-based chemisorption and catalysis research.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Engineering, Chemical
Yonghou Xiao, Jiahui Fu, Heyang Zhu, Qidong Zhao, Liang Zhou
Summary: In this study, ZSM-5 zeolite nanocrystals were successfully fabricated to improve the adsorptive desulfurization performance of traditional ZSM-5 zeolite. The nanocrystals effectively reduced the diffusion pathway, increased the specific surface area, and enhanced the desulfurization efficiency. Furthermore, ion exchange enhanced the meso-porous characteristics and Lewis acid sites, promoting the adsorption desulfurization performance.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Ziyi Li, Jun Li, Huazhen Rong, Jiayu Zuo, Xiong Yang, Yi Xing, Yingshu Liu, Guangshan Zhu, Xiaoqin Zou
Summary: This study reports a method of facilitating SO2/NO2 separation through NO2 dimerization. The NO2 dimerization is triggered by temperature and pressure, resulting in N2O4 with a larger molecular size, which inhibits N2O4 diffusion into the zeolite pore and achieves high separation selectivity. High performance SO2/NO2 separation was achieved on an SSZ-13 zeolite membrane.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Physical
Hwangho Lee, Inhak Song, Se Won Jeon, Do Heui Kim
Summary: By introducing Co2+ co-cations onto Cu-SSZ-13 catalyst, the reactivity of CuCo-SSZ-13 catalyst can be enhanced, demonstrating higher SCR reactivity compared to conventional Cu-SSZ-13 catalyst under both low- and high-temperature conditions.
CATALYSIS SCIENCE & TECHNOLOGY
(2021)
Article
Energy & Fuels
Zixun Liu, Dongwei Yao, Feng Wu
Summary: The study found that the Si/Al ratio of the Cu-SSZ-13 catalyst should be reasonably planned to enable complete urea decomposition and reduce the risk of urea deposition.
Article
Chemistry, Physical
Renjie Liu, Denis Leshchev, Eli Stavitski, Mitchell Juneau, Jane N. Agwara, Marc D. Porosoff
Summary: Research on utilizing CO2 as a C-1 feedstock for the synthesis of chemicals and fuels shows that the selectivity of catalysts is strongly linked to the Si/Al ratio and the method of introducing the K promoter.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Multidisciplinary
M. Mihaylov, K. Chakarova, S. Andonova, N. Drenchev, E. Ivanova, E. A. Pidko, A. Sabetghadam, B. Seoane, J. Gascon, F. Kapteijn, K. Hadjiivanov
CHEMICAL COMMUNICATIONS
(2016)
Article
Chemistry, Physical
Mihail Mihaylov, Kristina Chakarova, Stanislava Andonova, Nikola Drenchev, Elena Ivanova, Anahid Sabetghadam, Beatriz Seoane, Jorge Gascon, Freek Kapteijn, Konstantin Hadjiivanov
JOURNAL OF PHYSICAL CHEMISTRY C
(2016)
Article
Chemistry, Physical
Tony Pham, Katherine A. Forrest, Hiroyasu Furukawa, Margarita Russina, Alberto Albinati, Peter A. Georgiev, Juergen Eckert, Brian Space
JOURNAL OF PHYSICAL CHEMISTRY C
(2017)
Article
Chemistry, Physical
Mali H. Rosnes, Denis Sheptyakov, Alexandra Franz, Matthias Frontzek, Pascal D. C. Dietzel, Peter A. Georgiev
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2017)
Article
Chemistry, Applied
Oleg Lagunov, Nikola Drenchev, Kristina Chakarova, Dimitar Panayotov, Konstantin Hadjiivanov
TOPICS IN CATALYSIS
(2017)
Article
Chemistry, Physical
Stanislava Andonova, Zehra Aybegum Ok, Nikola Drenchev, Emrah Ozensoy, Konstantin Hadjiivanov
JOURNAL OF PHYSICAL CHEMISTRY C
(2018)
Article
Chemistry, Physical
Nikola Drenchev, Mali H. Rosnes, Pascal D. C. Dietzel, Alberto Albinati, Konstantin Hadjiivanov, Peter A. Georgiev
JOURNAL OF PHYSICAL CHEMISTRY C
(2018)
Article
Chemistry, Applied
Kristina Chakarova, Ina Strauss, Mihail Mihaylov, Nikola Drenchev, Konstantin Hadjiivanov
MICROPOROUS AND MESOPOROUS MATERIALS
(2019)
Article
Chemistry, Multidisciplinary
Pascal D. C. Dietzel, Peter A. Georgiev, Morten Froseth, Rune E. Johnsen, Helmer Fjellvag, Richard Blom
CHEMISTRY-A EUROPEAN JOURNAL
(2020)
Correction
Chemistry, Multidisciplinary
Peter A. Georgiev, Alberto Albinati, Barbara L. Mojet, Jacques Ollivier, Juergen Eckert
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Chemistry, Physical
P. A. Georgiev, N. Drenchev, K. I. Hadjiivanov, J. Ollivier, T. Unruh, A. Albinati
Summary: The study reveals differences in the binding form, quantity, and stability of copper with dihydrogen in different ZSM-5 zeolites, influenced by the copper exchange level and aluminum distribution.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Proceedings Paper
Nanoscience & Nanotechnology
Krum V. Bardarov, Ivan Buchvarov, Tanya Yordanova, Peter A. Georgiev
INTERNATIONAL CONFERENCE ON QUANTUM, NONLINEAR, AND NANOPHOTONICS 2019 (ICQNN 2019)
(2019)
Article
Chemistry, Multidisciplinary
Oliver Erhart, Peter A. Georgiev, Harald Krautscheid
Article
Chemistry, Multidisciplinary
Leah Morris, James J. Hales, Michel L. Trudeau, Peter Georgiev, Jan Peter Embs, Juergen Eckert, Nikolas Kaltsoyannis, David M. Antonelli
ENERGY & ENVIRONMENTAL SCIENCE
(2019)