Article
Chemistry, Physical
Ziliang Yuan, Guanghui Wang, Xun Li, Yurong He, Pan Wang, Francesco Mauriello, Zehui Zhang
Summary: Ni nanoparticle catalysts supported on Vulcan carbon (VCX) were prepared and used for the acceptorless dehydrogenation of primary amines to secondary amines. The best performance was achieved with Ni(A)/VXC with Ni particle size of 11.9 nm at 150 degrees C. This work provides inspiration for further investigation into acceptorless dehydrogenation using non-noble metal catalysts.
JOURNAL OF CATALYSIS
(2023)
Review
Chemistry, Multidisciplinary
Atanu Bera, Sourajit Bera, Debasis Banerjee
Summary: This article summarizes the recent advances in the dehydrogenation of N-heteroaromatics, discussing different catalysis approaches and reaction conditions such as precious metal and non-precious metal catalysis, photocatalysis, electrocatalysis, and organo-catalysis.
CHEMICAL COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Xufeng Nie, Mei Wang, Yihua Fu, Jiaqi Xu, Xueli Zheng, Hua Chen, Zhishan Su, Haiyan Fu, Ruixiang Li
Summary: We have developed a new catalytic system for preparing amides using tandem acceptorless dehydrogenation of amines and oxygen transfer of DMSO. This system demonstrates excellent catalytic activity and selectivity, converting various primary amines and even diamines into the corresponding amides with yields ranging from good to quantitative (>99%). The remarkable catalytic performance of this binuclear ruthenium complex is attributed to a unique chelating model that allows efficient oxygen transfer from DMSO via a six-membered ring transition state.
JOURNAL OF CATALYSIS
(2023)
Article
Chemistry, Multidisciplinary
Jie Luo, Quan-Quan Zhou, Michael Montag, Yehoshoa Ben-David, David Milstein
Summary: This study demonstrates an efficient and selective ruthenium-catalyzed synthesis of primary amides from alcohols and ammonia, with no need for acceptors. The selectivity of this system is rationalized through density functional theory calculations.
Article
Chemistry, Multidisciplinary
Lanfeng Wei, Yu Wei, Jinli Zhang, Liang Xu
Summary: This research explores a visible-light-induced oxidative dehydrogenative process using an organoboron compound as the photocatalyst and molecular oxygen as the sole oxidant. This approach successfully accessed an array of N-heterocycles under metal-free mild conditions, in good to excellent yields.
Article
Chemistry, Organic
Keshav Paudel, Shi Xu, Keying Ding
Summary: A switchable alpha-olefination and alpha alkylation of nitriles with primary alcohols catalyzed by a well-defined base transition-metal Co complex was presented, offering a broad variety of nitriles and primary alcohols to be selectively and efficiently converted to the corresponding products. The transformation is environmentally benign and atom efficient with H-2 and H2O being the sole byproducts.
Article
Chemistry, Multidisciplinary
Lovjot Kaur, Manoj Kumar, Vandana Bhalla
Summary: Type I photostable photosensitizing assemblies of DPZ-TPY have been developed using phenazine as a strong acceptor and terpyridine groups as a weak acceptor. The as-prepared DPZ-TPY assemblies exhibit sufficient excited state potential to catalyse the synthesis of symmetrical azoaromatics through direct regulated oxidation of anilines in excellent yields (93%), without the formation of over-oxidized product. Consequently, DPZ-TPY assemblies also catalyse the formation of unsymmetrical azoaromatics starting from hydrazobenzenes under mild reaction conditions. The potential of DPZ-TPY assemblies to catalyse the gram-scale synthesis of azobenzene demonstrates their real-time application.
Article
Chemistry, Physical
Leon Schumacher, Christian Hess
Summary: This study focuses on the mechanistic understanding of propane oxidative dehydrogenation over ceria-supported vanadia catalysts, elucidating the crucial role of surface lattice oxygen from ceria and the indirect role of vanadia structures in increasing the overall selectivity. The synergy effect between vanadia and ceria in oxidation reactions is demonstrated, providing a basis for a detailed understanding of the role of the support in VOx/CeO2 and other supported vanadia catalysts.
JOURNAL OF CATALYSIS
(2021)
Article
Chemistry, Physical
Sadia Afrin, Praveen Bollini
Summary: Quantitative analyses of four sets of aerobic/anaerobic ethanol conversion transients reveal the evolution of a high-surface-area cerium oxide surface that catalyzes nonoxidative ethanol dehydrogenation upon complete surface reduction. Aerobic-anaerobic switches lead to new steady state dehydrogenation rates, with termination of oxygen imbalances and induction periods in anaerobic experiments pointing to ethanol dehydrogenation turnovers originating from surface reduction. High vacancy densities obtained from analysis of oxygen imbalances indicate the catalytic origin of acetaldehyde during aerobic-anaerobic switches and anaerobic induction periods.
JOURNAL OF CATALYSIS
(2021)
Article
Thermodynamics
Jiyoung Moon, Dela Quarme Gbadago, Minjeong Kim, Sungwon Hwang
Summary: Solar salt is commonly used as a heat transfer fluid in industrial applications, but its high melting point makes it economically unattractive. This study investigated 12 different molten salts and found that low melting point salts have high heat removal efficiencies but lower conversion rates. Economic evaluation showed that LiNaKCsCaNO3 and NaKCaNO3 salts are suitable for thermal storage systems, while higher melting point salts like solar salt are more economical for applications requiring further heating.
APPLIED THERMAL ENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Jing Qi, Xiyan Wang, Gan Wang, Srinivas Reddy Dubbaka, Patrick ONeill, Hwee Ting Ang, Jie Wu
Summary: This study presents a green and environmentally friendly approach for the synthesis of imides using electrocatalytic oxidation with H2O as the oxygen source. The method eliminates the need for toxic or expensive oxidants and achieves high yields under mild reaction conditions. It shows broad substrate compatibility and potential for industrial applications.
Article
Chemistry, Physical
Wijnand Marquart, Shaine Raseale, Michael Claeys, Nico Fischer
Summary: The CO2 oxidative dehydrogenation reaction has the potential to play a role in CO2-utilizing catalytic reactions. Transition metal carbides, especially MoxCy, are promising catalysts for this reaction. The addition of promoters can significantly influence the crystal structure and acid-base characteristics of the carbide system, leading to enhanced activity, stability, and selectivity of the catalyst.
Article
Chemistry, Physical
Abdellah Benzaouak, Hanane Mahir, Adnane El Hamidi, Mohamed Kacimi, Leonarda Francesca Liotta
Summary: Phosphorus-loaded V2O5/ZrO2 catalysts were prepared and investigated in the oxidative dehydrogenation of propane. The addition of V2O5 and phosphorus to ZrO2 stabilized the tetragonal phase and improved acidity and selectivity to propylene. A correlation between catalyst acidity and oxidative dehydrogenation of propane was observed.
Article
Chemistry, Physical
Keigo Kamata, Nanami Kinoshita, Maki Koutani, Ryusei Aono, Eri Hayashi, Michikazu Hara
Summary: Beta-MnO2 nanoparticles with high specific surface areas were synthesized successfully and exhibited excellent catalytic activity and selectivity in the oxidation reaction of aromatic and heteroaromatic alcohols. The catalyst could also be used for the one-pot synthesis of nitriles and amides in the presence of ammonia, without the need for additional additives.
CATALYSIS SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Organic
Raviramanujayya Tammisetti, Bor-Cherng Hong, Su-Ying Chien, Gene-Hsiang Lee
Summary: The stereoselective visible-light photo catalysis of dihydroquinoxalinone derivatives via cyclization has efficiently formed polycyclic ring structures, with the formation of multiple bonds and high stereoselectivity.
