Article
Chemistry, Multidisciplinary
Henning Windeck, Fabian Berger, Joachim Sauer
Summary: The location of Bronsted-acid sites at different crystallographic positions of zeolite catalysts influences their reactivity. By selecting the most stable conformers, it is found that the strength of internal H-bonds and the OH bond length vary substantially with the framework position. The experimental results support the previously debated assignments of H-bonded b-OH sites.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Sang Hyun Ahn, Qiang Wang, Yongxiang Wang, Yueying Chu, Feng Deng, Suk Bong Hong
Summary: A clear understanding of the acidic properties of bridging Si-OH-Al groups in zeolites is crucial for optimizing their performance as catalysts. This study reveals the existence of previously unrecognized bridging Si-OH-Al groups in LTA zeolite with different crystallographic oxygen atoms compared to known Bronsted acid sites. The synthesis and properties of the specific type of bridging OH groups in zeolites depend on the content and spatial distribution of framework Al atoms.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Applied
Mariusz Gackowski, Anne Selent, Ilari Ainasoja, Michal Mazur, Michael Hunger, Jerzy Datka, Ville-Veikko Telkki
Summary: Ultra-stabilization of zeolites is achieved through high-temperature steaming and subsequent acid leaching, resulting in a stable and highly catalytically active material. Zeolite Y is found to have small particles of amorphous material in its porous structure, which can be removed by chemical treatment with 0.2 M TBAOH without altering the crystal structure. Treatment with NaOH-containing solutions, on the other hand, leads to significant changes in porosity and acidity. TBAOH-treated samples show distinct NMR spectra of adsorbed 129Xe, indicating higher xenon loading in supercages.
MICROPOROUS AND MESOPOROUS MATERIALS
(2023)
Article
Chemistry, Physical
Kamila Pyra, Karolina A. Tarach, Kinga Gora-Marek
Summary: This study explored the production of high olefins yield from plastic waste without losing gasoline fraction, by comparing different properties of commercial FAU zeolites and mesoporous materials. A polypropylene (PP) cracking catalyst suitable for low-temperature operation was found. Advanced characterization techniques and analysis methods provided insights into the active species during cracking reaction and the nature of coke deposit formed after reaction.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Physical
Paul Kim, Jeroen Van Der Mynsbrugge, Hassan Aljama, Trevor M. Lardinois, Rajamani Gounder, Martin Head-Gordon, Alexis T. Bell
Summary: This study investigates the adsorption of NO on Pd/H-CHA and finds that NO adsorption is governed by Pd2+ and Pd+ sites at different temperatures. In addition, the IR spectroscopy results show that the feature at 1860 cm(-1) is attributed to weakly-bound NO on Pd2+ and strongly-bound NO on Pd+ is responsible for the feature at 1810 cm(-1).
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Review
Chemistry, Physical
Sharon E. Ashbrook, Russell Morris, Cameron M. Rice
Summary: This article discusses the use of solid-state NMR experiments in studying the development of new types of zeolites, as well as the application of 17O NMR spectroscopy in probing reactivity and understanding the behavior of zeolites in the presence of liquid water.
CURRENT OPINION IN COLLOID & INTERFACE SCIENCE
(2022)
Article
Chemistry, Physical
Luke Forster, Mohamed M. M. Kashbor, James Railton, Sarayute Chansai, Christopher Hardacre, Marco Conte, Carmine D'Agostino
Summary: Sn and Ga doped zeolite Y catalysts were studied for the isomerization of glucose to fructose in different solvents. Ethanol favored a Lewis acid site catalyzed pathway, while methanol resulted in an equal distribution of products. The catalysts were inactive in water due to strong solvent adsorption. The results provide evidence of the importance of solvent adsorption properties in zeolites for glucose to fructose isomerization and may aid in designing and optimizing catalytic systems.
JOURNAL OF CATALYSIS
(2023)
Article
Chemistry, Multidisciplinary
Sergei S. Arzumanov, Anton A. Gabrienko, Dieter Freude, Juergen Haase, Alexander G. Stepanov
Summary: This article investigates the kinetics of H/D hydrogen exchange reactions using H-1 MAS NMR. The results show that the loading of Zn species can change the reaction mechanism from indirect exchange to direct exchange.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Physical
Yi Ji, Zhengmao Liu, Zhenchao Zhao, Pan Gao, Xinhe Bao, Kuizhi Chen, Guangjin Hou
Summary: The study investigates the molecular dynamics of molecules in MFI zeolites and finds that the structural differences have a significant impact on shape selectivity. In the absence of acid sites, molecules can only diffuse along straight channels and tend to occupy channel intersections. Different types of pore confinements result in different dynamic motions of the molecules. With the presence of acid sites, molecules are strongly adsorbed and their motions are further impeded.
Article
Chemistry, Multidisciplinary
William S. Salvia, Tommy Yunpu Zhao, Puranjan Chatterjee, Wenyu Huang, Frederic A. Perras
Summary: The study confirmed that the active sites in amorphous silica-alumina are zeolitic bridging Bronsted sites, using selective isotope labeling and quantitative NMR distance measurements.
CHEMICAL COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Shunsaku Yasumura, Takashi Toyao, Zen Maeno, Ken-ichi Shimizu
Summary: The study focused on the rational design of new lean NOx reduction catalysts under periodic lean and rich conditions. By investigating the reactions on Rh-exchanged Al-rich beta zeolites, it was found that NO was captured by Rh+ sites and selectively reduced to NH3, which in turn reduced NO to N-2. This cyclic process demonstrated effective NOx reduction in the lean de-NOx system.
Review
Multidisciplinary Sciences
Weiyu Wang, Jun Xu, Feng Deng
Summary: This review examines the recent progress in the study of zeolites and relevant catalytic reactions using solid-state NMR methods to explore framework structures, catalytically active sites, and intermolecular interactions. It also discusses the application of solid-state NMR technique in understanding the mechanistic aspects of zeolite-catalyzed reactions, such as methanol and ethanol conversions.
NATIONAL SCIENCE REVIEW
(2022)
Article
Chemistry, Multidisciplinary
Shadi Al-Nahari, Eddy Dib, Claudia Cammarano, Etienne Saint-Germes, Dominique Massiot, Vincent Sarou-Kanian, Bruno Alonso
Summary: The use of mineralizing agents (F- or OH-) in hydrothermal synthesis directly affects the distribution of Al sites in ZSM-5 zeolites. The Si/Al ratio impacts the proportions of Al sites for F-, whereas it remains constant for OH-. This understanding provides new and simple opportunities to control the acidity of zeolites.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Multidisciplinary Sciences
Yunzhou Wen, Cheng Liu, Rui Huang, Hui Zhang, Xiaobao Li, F. Pelayo Garcia de Arquer, Zhi Liu, Youyong Li, Bo Zhang
Summary: In this study, the authors enhance acidic oxygen evolution by introducing strong Bronsted acid sites into RuO2, improving the stability and activity of the catalyst. This strategy could serve as an important reference for the development of stable catalysts.
NATURE COMMUNICATIONS
(2022)
Review
Agronomy
Andres Perez-San Martin, Frutos C. Marhuenda-Egea, Maria Angeles Bustamante, Gustavo Curaqueo
Summary: This review critically analyzes and updates the chemical spectroscopy methods for evaluating the transformation of organic matter in composting, and discusses their potential applications in optimizing compost quality for agricultural use.
Article
Chemistry, Physical
Iljeong Heo, Steven J. Schmieg, Se H. Oh, Wei Li, Charles H. F. Peden, Chang Hwan Kim, Janos Szanyi
CATALYSIS SCIENCE & TECHNOLOGY
(2018)
Review
Chemistry, Physical
Feng Gao, Charles H. F. Peden
Article
Chemistry, Physical
Libor Kovarik, Mark Bowden, Dachuan Shi, Janos Szanyi, Charles H. F. Peden
JOURNAL OF PHYSICAL CHEMISTRY C
(2019)
Article
Multidisciplinary Sciences
Aiyong Wang, Ying Chen, Eric D. Walter, Nancy M. Washton, Donghai Mei, Tamas Varga, Yilin Wang, Janos Szanyi, Yong Wang, Charles H. F. Peden, Feng Gao
NATURE COMMUNICATIONS
(2019)
Editorial Material
Chemistry, Physical
Charles H. F. Peden
JOURNAL OF CATALYSIS
(2019)
Article
Chemistry, Physical
Yani Zhang, Yue Peng, Kezhi Li, Shuai Liu, Jianjun Chen, Junhua Li, Feng Gao, Charles H. F. Peden
Article
Chemistry, Physical
Yanran Cui, Yilin Wang, Donghai Mei, Eric D. Walter, Nancy M. Washton, Jamie D. Holladay, Yong Wang, Janos Szanyi, Charles H. F. Peden, Feng Gao
JOURNAL OF CATALYSIS
(2019)
Article
Chemistry, Applied
Aiyong Wang, Ying Chen, Eric D. Walter, Nancy M. Washton, Tamas Varga, Yilin Wang, Janos Szanyi, Yong Wang, Charles H. F. Peden, Feng Gao
Summary: The model Cu/SAPO-34 SCR catalyst with isolated Cu(II) ions deactivates irreversibly after storage due to the attack of water molecules on active sites, leading to the formation of copper-aluminate-like species upon thermal treatment. This deactivation mechanism does not require significant degradation of the SAPO-34 support.
Article
Multidisciplinary Sciences
Yu Gao, Andrew S. Lipton, Yuuki Wittmer, Dylan T. Murray, Jenny C. Mortimer
NATURE COMMUNICATIONS
(2020)
Article
Chemistry, Physical
Angelina Gigante, Noemi Leick, Andrew S. Lipton, Ba Tran, Nicholas A. Strange, Mark Bowden, Madison B. Martinez, Romain Moury, Thomas Gennett, Hans Hagemann, Tom S. Autrey
Summary: The addition of activated MgH2 significantly improves the efficiency of Mg(B3H8)(2) conversion to BH4- and reduces B-losses. The system can selectively convert at moderate temperature (200 degrees C) in a short period of time, showing great potential for energy storage applications.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Damien B. Culver, Rick W. Dorn, Amrit Venkatesh, Jittima Meeprasert, Aaron J. Rossini, Evgeny A. Pidko, Andrew S. Lipton, Graham R. Lief, Matthew P. Conley
Summary: The study elucidates the reaction mechanism of triisobutylaluminum with aluminum oxide and a zirconocene precatalyst, generating ion pairs to catalyze ethylene polymerization.
ACS CENTRAL SCIENCE
(2021)
Article
Engineering, Environmental
Rachel A. Neurath, Jennifer Pett-Ridge, Ilexis Chu-Jacoby, Donald Herman, Thea Whitman, Peter S. Nico, Andrew S. Lipton, Jennifer Kyle, Malak M. Tfaily, Alison Thompson, Mary K. Firestone
Summary: Minerals play a critical role in preserving soil carbon and forming soil organic matter associations. Roots, carbon sources, and microbial communities influence the formation of these associations, with minerals in plant rhizospheres being associated with a more diverse array of compounds.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Physical
Nicholas A. Strange, Noemi Leick, Sarah Shulda, Andreas Schneemann, Vitalie Stavila, Andrew S. Lipton, Michael F. Toney, Thomas Gennett, Steven T. Christensen
Summary: Magnesium borohydride is a promising material for hydrogen storage, but its slow dehydrogenation kinetics and formation of intermediate polyboranes limit its application in clean energy technologies. This study presents a novel approach of modifying the physicochemical properties of magnesium borohydride by adding reactive molecules in the vapor phase. The effects of four different molecules on the additive-Mg(BH4)(2) interaction and hydrogen release at lower temperatures are examined. The results demonstrate the efficacy of this approach and provide a new path for additive-based modification of hydrogen storage materials.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Inorganic & Nuclear
Joseph E. Reynolds, Austin C. Acosta, ShinYoung Kang, Sichi Li, Andrew S. Lipton, Mark E. Bowden, Nicholas R. Myllenbeck, Andreas Schneemann, Noemi Leick, Austin Bhandarkar, Christopher Reed, Robert D. Horton, Thomas Gennett, Brandon C. Wood, Mark D. Allendorf, Vitalie Stavila
Summary: This study reports a new class of Grignard reagents, reactive borohydride anions replacing halides, which adds a new synthetic dimension and exhibits unique reactivity and potential applications.
Article
Chemistry, Physical
Rachel E. Mow, Andrew S. Lipton, Sarah Shulda, E. Ashley Gaulding, Thomas Gennett, Wade A. Braunecker
JOURNAL OF MATERIALS CHEMISTRY A
(2020)
