Article
Green & Sustainable Science & Technology
Aymeric Magisson, Edwin B. Clatworthy, Sajjad Ghojavand, Philippe Bazin, Valerie Ruaux, Eddy Dib, Svetlana Mintova
Summary: Alkaline-earth metal cations affect the crystallization rate and adsorption properties of nanosized chabazite zeolites. The presence of calcium or barium leads to changes in crystallization rate and adsorption capacity, while maintaining similar crystallite size and morphology.
ADVANCED SUSTAINABLE SYSTEMS
(2023)
Review
Medicine, General & Internal
Virendra Kumar Yadav, Nisha Choudhary, Gajendra Kumar Inwati, Ashita Rai, Bijendra Singh, Bharat Solanki, Biswaranjan Paital, Dipak Kumar Sahoo
Summary: Medical-grade oxygen is essential for medical complications, especially respiratory discomfort. The demand for medical-grade oxygen has surged during the pandemic, and its scarcity has resulted in complications and even deaths. Oxygen concentrators have become a crucial resource, particularly during respiratory infections. Nanotechnology has shown promise in improving the efficiency of oxygen production in concentrators, with nano zeolites suggested as a replacement for conventional molecular zeolites.
FRONTIERS IN MEDICINE
(2023)
Review
Chemistry, Organic
P. S. Kuznetsov, K. I. Dementiev, T. A. Palankoev, D. S. Kalmykova, V. V. Malyavin, A. D. Sagaradze, A. L. Maximov
Summary: The methods of preparing zeolites with particle sizes between 50-200 nm using mechanical milling on bead mills were analyzed in this study. The milling process leads to degradation of the zeolite lattice, resulting in reduced crystallinity and catalytic activity. Post-treatment methods such as recrystallization and dealumination show promise for restoring the zeolite structure, with crucial importance placed on the selection of conditions for such treatments.
PETROLEUM CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Zhi-Bo Yan, Meng Peng, Qi-Long Chen, Ka Lu, Yong-Qiang Tu, Kun-Long Dai, Fu-Min Zhang, Xiao-Ming Zhang
Summary: This study presents a versatile silylation reaction using a SNIr catalyst to obtain heteroarylsilanes from heteroaryl C-H bonds. Mechanistic experiments reveal that favorable silylations occur at the γ or δ positions of chelating heteroatoms forming cyclic intermediates.
Article
Chemistry, Organic
Gavin Chit Tsui, Yuwei Zong, Ziwei Luo
Summary: We report a novel palladium(0)-catalyzed defluorosilylation method for highly stereoselective synthesis of tetrasubstituted vinylsilanes containing monofluoroalkene motif. This is the first example of C-heteroatom bond formation from C-F bond using Pd catalytic manifold.
Article
Energy & Fuels
Tianlong Liu, Fei Ning, Qi Li, Zhonghong Li, Xiaobo Feng, Xiaoyan Zhao
Summary: Chemical etching with acids is a common method for post-treating zeolites, but it has negative effects on their structure and acidity. This study presents a new method using a buffer solution and AlF3 to treat HZSM-5 zeolite for one-step dealumination and alumination. The treated zeolites maintain high crystallinity and acidity, with the formation of secondary mesopores. The AlF3-modified zeolites exhibit higher catalytic activity in reforming lignite pyrolytic volatiles into light aromatics, suppressing coke deposition and yielding desired products.
Article
Chemistry, Multidisciplinary
Yonghui Li, Qingqing Fan, Haiquan Yang, Shangqing Xie, Wei Huang, Xiaoyan Li, Hongjian Sun, Olaf Fuhr, Dieter Fenske
Summary: In this study, two [PCP] pincer silylene cobalt(i) complexes were synthesized and their catalytic performance was investigated. One of the complexes showed efficient catalytic activity for the hydrosilylation of alkenes, demonstrating its potential application in organic synthesis. The molecular structures of the complexes were determined by single crystal X-ray diffraction analysis.
NEW JOURNAL OF CHEMISTRY
(2021)
Article
Chemistry, Applied
Anthony Vallace, Grant C. Kester, Chris Bongo, William Casteel, Garret Lau, Roger Whitley, Charles G. Coe
Summary: Phase-pure, Al-rich CHA was prepared through gel routes, with the product phase being influenced by cation composition and seed addition. Adsorption studies revealed variations in adsorption properties in mixed Ca/Li systems with different Ca loadings.
MICROPOROUS AND MESOPOROUS MATERIALS
(2021)
Article
Chemistry, Applied
He Gong, Nitin Goyal, Liying Liu, Yisong Wang, Xin Fang, He Jia, Gang Li, Tao Du
Summary: This study successfully synthesized an excellent chabazite membrane and verified its outstanding performance in CO2/N-2 separation with high separation coefficient. The presence of chabazite membrane has a significant impact on the separation of mixed gases, demonstrating excellent stability and separation performance.
JOURNAL OF POROUS MATERIALS
(2021)
Correction
Chemistry, Applied
Rongxin Zhang, Duaa Raja, Yong Zhang, Ying Yan, Arthur A. Garforth, Yilai Jiao, Xiaolei Fan
Summary: The original version of the article contained an error and the authors have issued this correction to rectify it.
TOPICS IN CATALYSIS
(2021)
Article
Chemistry, Multidisciplinary
Zhe Ma, Hua Deng, Lin Li, Qiang Zhang, Guangrui Chen, Chang Sun, Hong He, Jihong Yu
Summary: Highly dispersed nanosized Beta zeolite with a high toluene adsorption capacity was synthesized using a microwave-assisted hydrothermal strategy, providing a facile avenue for fluoride-free and seed-free synthesis of high-silica zeolites for VOCs adsorption.
Review
Chemistry, Multidisciplinary
Yichen Wu, Peng Wang
Summary: Optically active organosilanes have been demonstrated to be versatile chiral reagents in synthetic chemistry. Monohydrosilanes, which bear a Si-H bond, are especially unique due to their facile transformations through stereospecific bond-formation reactions. In addition, they have also been used as chiral reagents for alcohol resolution, chiral auxiliaries, mechanistic probes, and potential optoelectronic materials.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Multidisciplinary
Martin Jaeger Pedersen, Christian Marcus Pedersen
Summary: A method for introducing dimethylphenylsilyl at the 4-position in carbohydrates has been developed, showing higher reactivity compared to the corresponding 4-deoxy-analogue. The introduction of a C-Si increases the relative reactivity by a modest factor of around two.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Applied
Maria Pilar Cumplido, Maria Jose Diaz-Cabanas
Summary: ITQ-34 zeolite is a promising catalyst with a three-dimensional mesoporous structure for FCC process. This study successfully synthesized aluminum-rich ITQ-34 zeolite, addressing the issues of low germanium content and blockage of channels by phosphate compounds. The aluminum ITQ-34 zeolite exhibits excellent catalytic performance in propylene production.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
Article
Chemistry, Inorganic & Nuclear
Wenfeng Hao, Xiaojun Yan, Xiliang Guo, Wentao Wang, Taihong Yan, Jia-Nan Zhang, Wenfu Yan
Summary: Cs-137(+) is the main radioactive nuclide in nuclear wastewater. The efficient and fast removal of radioactive Cs+ from wastewater is essential for the safe use of nuclear energy and human health. In this study, a green and facile synthesis method of low-silica CHA zeolite with exceptional selectivity and deep removal ability for radioactive Cs-137(+) from real nuclear power wastewater was reported.
INORGANIC CHEMISTRY FRONTIERS
(2023)
Article
Chemistry, Inorganic & Nuclear
Siriporn Kosawatthanakun, Edwin B. Clatworthy, Sajjad Ghojavand, Narongrit Sosa, Jatuporn Wittayakun, Svetlana Mintova
Summary: This study investigates the morphology and size effect of catalysts on the conversion of glycerol to glycerol carbonate. Nano-sized CsBPH_AP catalysts show superior performance compared to micron-sized KBPH_AP. Ion-exchange of the catalysts leads to different basicity and catalytic activity. The study highlights the importance of catalyst morphology and size in the valorization of glycerol.
INORGANIC CHEMISTRY FRONTIERS
(2023)
Article
Chemistry, Inorganic & Nuclear
Zhenxiang Zhao, Jun Yang, Ningkun Xu, Tian Nan, Pingping Wu, Chunzheng Wang, Xiaohua Wang, Peng Bai, Zifeng Yan, Svetlana Mintova
Summary: In this study, a highly dispersed In-Sn oxide catalyst with decreased OH groups and increased coordinatively unsaturated sites (CUS) was successfully prepared. The presence of water had no deleterious effect on the catalyst's activity due to the formation of water-tolerant Lewis acid sites (LAS). As a result, a record-high MLA yield of 57.6% was achieved using the In-Sn oxide catalyst. This work provides a new strategy for the design of non-zeolite metal oxide catalysts with improved water tolerance and high activity.
INORGANIC CHEMISTRY FRONTIERS
(2023)
Article
Nanoscience & Nanotechnology
Peng Bai, Zhenxiang Zhao, Yonghui Zhang, Zhengke He, Yonghui Liu, Chunzheng Wang, Shixingwang Ma, Pingping Wu, Lianming Zhao, Svetlana Mintova, Zifeng Yan
Summary: Well-dispersed PdIn bimetallic alloy nanoparticles were immobilized on mesostructured silica with PdIn-In2O3 interfaces, and their catalytic performance for benzyl alcohol partial oxidation was evaluated. It was found that the Pd-rich PdIn-In2O3 interface exhibited higher catalytic activity than In-rich Pd2In3 species, attributed to the exposure of more Pd-enriched active sites and enhanced oxygen transfer.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Engineering, Environmental
Chunzheng Wang, Ningkun Xu, Ke Huang, Bin Liu, Peihua Zhang, Ge Yang, Hailing Guo, Peng Bai, Svetlana Mintova
Summary: An emerging synthetic route for the co-synthesis of dimethyl oxalate (DMO) and dimethyl carbonate (DMC) via the indirect oxidative carbonylation of CH3OH is presented. The catalytic performance strongly depended on the catalyst activation, as the heat treatment could tune the silanols around the Pd species on the silicalite-1 zeolite. The best performing catalyst had an average Pd nanoparticle size of 3.2 nm and Pd loading of 0.48 wt%, showing high stability for at least 200 h.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Shuang Tan, Justine Jean, Valerie Pralong, Simona Moldovan, Hailing Guo, Svetlana Mintova
Summary: Study on the impact of particle size on the storage of Na+ ions in ZTC revealed that reducing particle size increases the external surface area and formation of solid electrolyte interlayers, facilitating the filling of internal pores by sodium ions.
CRYSTAL GROWTH & DESIGN
(2023)
Article
Chemistry, Physical
Eddy Dib, Svetlana Mintova, Georgi N. Vayssilov, Hristiyan A. Aleksandrov, Marina Carravetta
Summary: By using a combination of symmetry-based recoupling in 29Si NMR, spin dynamics-based simulations, and DFT-based theoretical calculations, we demonstrate how to characterize the 29Si NMR peaks of (Si-O-Si), Bronsted acid sites (Si-OH-Al), and silanols (Si-OH) in nanosized ZSM-5 zeolites. Theoretical calculations and experimental observations reveal significant differences in the chemical shift anisotropy for silicon nuclei close to aluminum (Q(4)(1Al)) compared to those which are not, allowing for clear assignment of Si-29 NMR peaks. The isotropic chemical shift alone cannot differentiate these differences.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Mishel Markovski, Eddy Dib, Sajjad Ghojavand, Abdallah Amedlous, Valerie Ruaux, Aymeric Magisson, Oleg Lebedev, Igor E. Golub, Francesco Dalena, Svetlana Mintova
Summary: Isotopic substitution was used to investigate the crystallisation mechanism of template-free nanosized FAU zeolite in colloidal precursors, revealing that Na+ exhibited lower mobility in the deuterated medium, leading to slower nucleation and crystallisation in the initial stages.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Article
Engineering, Chemical
Guodong Kong, Ge Yang, Panpan Xu, Zixi Kang, Hailing Guo, Mengling Sun, Zifeng Yan, Svetlana Mintova, Daofeng Sun
Summary: Inorganic membranes have gained attention due to their uniform pore size, higher flux, and better chemical stability. However, the development of these membranes still faces obstacles in terms of preparation and high cost. This study presents a facile interfacial assembly strategy for the synthesis of flexible silica membranes, which show significantly higher permeance and excellent chlorine resistance compared to polymeric membranes.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Edwin B. Clatworthy, Simona Moldovan, Kalthoum Nakouri, Stoyan P. Gramatikov, Francesco Dalena, Marco Daturi, Petko St. Petkov, Georgi N. Vayssilov, Svetlana Mintova
Summary: This study directly visualizes the structural flexibility of a high-aluminum nano-sized RHO zeolite using in situ TEM for the first time. Variable temperature experiments observe the physical expansion of nanocrystals in response to changes in guest-molecule chemistry and temperature. Operando FTIR spectroscopy complements the observations and verifies the nature of adsorbed CO2 and structural changes at high temperatures. Quantum chemical modeling substantiates the effect of cation mobility and CO2 on the flexibility behavior of the structure. The results demonstrate the combined influences of temperature and CO2 on the structural flexibility consistent with experimental observations.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Applied
Peng Peng, Simona Moldovan, Aurelie Vicente, Valerie Ruaux, Maxime Debost, Han Hu, Hristiyan A. Aleksandrov, Georgi N. Vayssilov, Zi-Feng Yan, Svetlana Mintova
Summary: Nanosized MFI type zeolites were synthesized using Cu-containing complexes. The use of EDTA as a ligand promoted solubility and ensured exclusive configuration of copper-bearing chelate. EDTA-assisted MFI zeolite nanocrystals (Cu-MFIEDTA) had low silanol content due to flexible Si-O-Cu bonds. NH3 as a ligand resulted in extra framework [Cu delta+,,,O delta- ,,,Cu delta+]n clusters in the corresponding sample (Cu-MFI-NH3).
MICROPOROUS AND MESOPOROUS MATERIALS
(2023)
Article
Chemistry, Applied
Ge Yang, Yanjiao Wang, Mengling Sun, Panpan Xu, Chunzheng Wang, Ke Huang, Heqing Jiang, Svetlana Mintova, Hailing Guo
Summary: The amino-modification of filler material is a common strategy for optimizing the performance of mixed matrix membranes (MMMs). However, in this study, it was found that the in-situ introduction of amino groups into the HKUST-1 filler had negative effects on the gas separation performance of the MMMs, suggesting that using MOFs fillers with large aperture size may not support H2/CO2 separation. This work further investigates the diffusion-adsorption coupling control mechanism of fillers with large aperture size, providing insights for the development of MMMs materials.
MICROPOROUS AND MESOPOROUS MATERIALS
(2023)
Article
Chemistry, Physical
Ming Cheng, Hugo Cruchade, Ludovic Pinard, Eddy Dib, Honghai Liu, Jiujiang Wang, Xinmei Liu, Zi-Feng Yan, Zhengxing Qin, Svetlana Mintova
Summary: Molybdenum-modified HZSM-5 catalysts are widely used for methane dehydroaromatization but suffer from rapid deactivation due to coke formation. This study proposes a new synthesis approach to improve the performance and stability of the catalysts by removing the crystal core. The results show that removing the crystal core effectively mitigates catalyst deactivation by relocating the coke from micropores to macropores, and the alkaline treatment further enhances the catalyst properties.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Chemistry, Multidisciplinary
Sajjad Ghojavand, Eddy Dib, Svetlana Mintova
Summary: Numerous evidence suggests that zeolitic materials exhibit intrinsic flexibility due to the spring-like behavior of Si-O and Al-O bonds and the distortion ability of Si-O-Si and Al-O-Si angles. The understanding of flexibility origin and its adjustment for high adsorption selectivity in zeolites is a great challenge. Zeolite flexibility can be classified into three categories: temperature and pressure-induced, guest-induced, and compositionally-induced. Overcoming the challenges in experimental evaluations will facilitate the design of novel selective adsorbents.
