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, Applied
Nikola Drenchev, Oleg Lagunov, Konstantin Hadjiivanov
Summary: Adsorption plays a crucial role in various natural and industrial processes. This study investigates the coordination chemistry of Ca2+ sites in CaX zeolite by analyzing the IR spectra of adsorbed probe molecules (CO and N2) at low temperature. The results reveal that the accessible Ca2+ sites are uniform and occupy SII positions, and each Ca2+ site in CaX has three coordinative vacancies. The findings have important implications for understanding adsorption mechanisms and designing efficient adsorbents.
MICROPOROUS AND MESOPOROUS MATERIALS
(2023)
Article
Chemistry, Physical
Lea Pasquale, Sharif Najafishirtari, Rosaria Brescia, Alice Scarpellini, Cansunur Demirci, Massimo Colombo, Liberato Manna
Summary: The study found that the effects of oxidation treatment on Pd-Cu and Pt-Cu bimetallic alloy nanocrystals were different, with Pt-Cu NCs undergoing complete dealloying while Pd-Cu NCs partially retained their alloy structure. Following the reducing treatment, Pd-Cu alloy NCs were largely restored while Pt-Cu NCs still contained a significant amount of oxide species.
CHEMISTRY OF MATERIALS
(2021)
Article
Chemistry, Applied
Jia Ding, Xu Huang, Qilei Yang, Lizhuo Wang, Yue Peng, Junhua Li, Jun Huang
Summary: In this study, a series of Cu-ZSM-5/Al-fiber catalysts with different Si/Al molar ratios were synthesized and their performance in NH3-SCR reaction was studied. The higher Si/Al molar ratio catalysts showed superior NH3 adsorption capacity and enhanced NOx degradation activity. The microstructured Cu-ZSM-5 catalysts exhibited better NH3-SCR performance at moderate temperatures under higher gas hourly space velocity, indicating improved mass transfer properties.
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, Multidisciplinary
Abdellah Arrahli, Abdelhak Kherbeche, Salim Derrouiche, Daniel Bianchi
Summary: The study using FTIR spectroscopy reveals that Sn on PtSn particles has significant effects on the geometric and electronic structures of Pt sites, altering the adsorption behavior of CO. Furthermore, the reconstruction and reduction cycles of PtSn particles lead to changes in the adsorption heats of CO species, indicating the dynamic nature of the PtSn catalyst system.
RESEARCH ON CHEMICAL INTERMEDIATES
(2021)
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
Multidisciplinary Sciences
Konstantin Khivantsev, Nicholas R. Jaegers, Hristiyan A. Aleksandrov, Libor Kovarik, Miroslaw A. Derewinski, Yong Wang, Georgi N. Vayssilov, Janos Szanyi
Summary: CO oxidation is important for both inorganic and living systems. Transition and precious metals can oxidize CO to CO2 on various materials, while aerobic organisms perform CO oxidation with nitrate using complex enzymes at ambient temperatures. Nitrate can facilitate CO oxidation, leading to the transformation of NOx and CO species in zeolite systems.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Zoya N. Lashchinskaya, Anton A. Gabrienko, Igor P. Prosvirin, Alexander V. Toktarev, Alexander G. Stepanov
Summary: Silver-modified zeolites with high selectivity for alkene transformation to aromatic hydrocarbons were studied. The effect of silver cations in zeolite on the pathways of propene aromatization was investigated using C-13 MAS NMR and Fourier-transform infrared spectroscopy. Results showed that propene on H-ZSM-5 transformed via conjunct polymerization while being influenced by Ag+ sites on Ag/H-ZSM-5, resulting in high selectivity for aromatic hydrocarbons.
Article
Environmental Sciences
Min-Ji Ha, Jung Eun Lee, Y. Park, Jin Sun Cha, Young-Min Kim, Beom-Sik Kim
Summary: The catalytic ozonation of methylethylketone (MEK) was investigated using synthesized Mn and Cu-loaded ZSM-5 catalysts. Different catalysts were studied for the removal of MEK and ozone, and 5 wt% Mn/ZSM-5 and 5Mn1CuZSM showed the highest efficiency, respectively. The 5Mn1CuZSM catalyst exhibited superior catalytic reactivity for ozone conversion and CO2 selectivity.
ENVIRONMENTAL RESEARCH
(2023)
Article
Thermodynamics
Chao Zhong, Jiqiu Tan, Hongyan Zuo, Xin Wu, Shaoli Wang, Junan Liu
Summary: The study reveals that CDPF passive regeneration affects SCR performance, while active regeneration deteriorates SCR performance. SCR NOX conversion varies with the change of NO2 concentration at the outlet of CDPF, while the outlet oxygen concentration of CDPF mainly influences downstream SCR performance under active regeneration conditions.
Article
Chemistry, Multidisciplinary
John H. Hack, James P. Dombrowski, Xinyou Ma, Yaxin Chen, Nicholas H. C. Lewis, William B. Carpenter, Chenghan Li, Gregory A. Voth, Harold H. Kung, Andrei Tokmakoff
Summary: The molecular structure and behavior of water confined in aluminosilicate zeolite pores is essential for understanding zeolite acid chemistry under hydrous conditions. By using a combination of ultrafast two-dimensional infrared spectroscopy and ab initio molecular dynamics, this study was able to characterize the hydrogen-bonding network within highly hydrated zeolite HZSM-5 pores. Results indicated that the excess charge is detached from the zeolite and resides near the more highly coordinated water molecules in the cluster.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Chemistry, Multidisciplinary
Alice M. Bumstead, David B. Cordes, Daniel M. Dawson, Kristina K. Chakarova, Mihail Y. Mihaylov, Claire L. Hobday, Tina Duren, Konstantin I. Hadjiivanov, Alexandra M. Z. Slawin, Sharon E. Ashbrook, Ram R. R. Prasad, Paul A. Wright
CHEMISTRY-A EUROPEAN JOURNAL
(2018)
Article
Chemistry, Multidisciplinary
J. Apuzzo, S. Cimino, L. Lisi
Article
Chemistry, Physical
Cristina Megias-Sayago, Kristina Chakarova, Anna Penkova, Alice Lolli, Svetlana Ivanova, Stefania Albonetti, Fabrizio Cavani, Jose Antonio Odriozola
Article
Chemistry, Applied
Kristina Chakarova, Ina Strauss, Mihail Mihaylov, Nikola Drenchev, Konstantin Hadjiivanov
MICROPOROUS AND MESOPOROUS MATERIALS
(2019)
Article
Chemistry, Applied
Ina Strauss, Kristina Chakarova, Alexander Mundstock, Mihail Mihaylov, Konstantin Hadjiivanov, Natalija Guschanski, Juergen Caro
MICROPOROUS AND MESOPOROUS MATERIALS
(2020)
Article
Chemistry, Applied
Valeria Di Sarli, Gianluca Landi, Almerinda Di Benedetto, Luciana Lisi
Summary: This study investigated the catalytic performance of metal-promoted CeO2 washcoated silicon carbide diesel particulate filters in soot oxidation. The amount and preparation method of the metal (Ag or Cu) were found to significantly influence the catalytic activity, with Ag-promoted catalysts prepared using method B showing the highest activity. The results suggest that the method of preparation plays a crucial role in enhancing the catalytic performance of the filters.
TOPICS IN CATALYSIS
(2021)
Article
Chemistry, Applied
Gianluca Landi, Valeria Di Sarli, Luciana Lisi
Summary: The study investigates the combined effects of initial temperature and catalyst activity on the regeneration dynamics of a catalytic diesel particulate filter (DPF) using CFD-based simulations. Results show different regeneration behaviors based on catalyst activity, with faster regeneration at high activity and a trade-off between time and peak temperature at intermediate activity. Optimal regeneration conditions involve setting the filter's initial temperature equal to the inlet gas temperature.
TOPICS IN CATALYSIS
(2021)
Review
Chemistry, Physical
Luciana Lisi, Stefano Cimino
Article
Chemistry, Physical
Stefano Cimino, Elisabetta Maria Cepollaro, Luciana Lisi, Stefano Fasolin, Marco Musiani, Lourdes Vazquez-Gomez
Summary: The development of highly conductive structured catalysts with enhanced mass- and heat-transfer features is needed for the intensification of strongly exothermic catalytic hydrogenation of CO2. Thin porous CeO2 layers deposited on Ni foams produced active catalytic sites for the hydrogenation of CO2, and the dispersion of Ru within the pores of the CeO2 layer further boosted the methanation activity.
Article
Chemistry, Physical
Roberto Sanchirico, Luciana Lisi, Valeria Di Sarli
Summary: An unexpected promoting effect of KBr on the degradation of picric acid was observed, which can mask the effects of test conditions. ZnSe, as an alternative diluting salt, acts as a truly inert diluting salt and prevents the promoting effect of KBr. The chemical inertness of ZnSe towards picric acid was confirmed by additional experiments.
Article
Chemistry, Physical
Elisabetta Maria Cepollaro, Stefano Cimino, Luciana Lisi, Mattia Biesuz, Balanand Santhosh, Gian Domenico Soraru
Summary: The study focused on enhancing the catalytic methanation of CO2 by using polymer-derived SiC open-cell foams as structured carriers, with appropriate pyrolysis temperatures preventing the formation of unwanted SiO2 layer and showing good mechanical strength and compatibility with the Ru/Al2O3 active catalytic overlayer.
Article
Chemistry, Physical
Roberto Sanchirico, Marco Luca Santonocito, Valeria Di Sarli, Luciana Lisi
Summary: This paper proposes a quick and reliable approach to predicting the shelf life of EMs, and its reliability is proven through experiments.
Article
Energy & Fuels
Valentina Gargiulo, Alfonso Policicchio, Luciana Lisi, Michela Alfe
Summary: The role of graphene-related materials (GRMs) in the structural and adsorption properties of MOF-based hybrids was investigated. The GRMs used were oxidized graphene-like (GL-ox), hydrazine-reduced graphene-like (GL), and amine-grafted graphene-like (GL-NH2) materials. The hybrid materials showed high specific surface area (SSA) and good affinity for CO2 and CH4, with different pore size distributions due to interactions between MOF precursors and specific functional groups on the GRM surface. The maximum storage capacity for CO2 and CH4 was highest for HKUST-1/GL-NH2, followed by HKUST-1, HKUST-1/GL-ox, and HKUST-1/GL. The measured uptakes were comparable or higher than those reported in the literature under similar conditions for Cu-HKUST-1 based hybrids.
Review
Chemistry, Physical
Luciana Lisi, Gianluca Landi, Valeria Di Sarli
Article
Chemistry, Physical
Ram R. R. Prasad, Sarah E. Seidner, David B. Cordes, Magdalena M. Lozinska, Daniel M. Dawson, Megan J. Thompson, Tina Duren, Kristina K. Chakarova, Mihail Y. Mihaylov, Konstantin I. Hadjiivanov, Frank Hoffmann, Alexandra M. Z. Slawin, Sharon E. Ashbrook, Matthew L. Clarke, Paul A. Wright
JOURNAL OF MATERIALS CHEMISTRY A
(2019)
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)
