Results 51 to 60 of about 59,417 (298)

Ca–Ag compounds in ethylene epoxidation reaction

Science and Technology of Advanced Materials, 2019
The ethylene epoxidation is a challenging catalytic process, and development of active and selective catalyst requires profound understanding of its chemical behaviour under reaction conditions.
Iryna Antonyshyn, Olga Sichevych, Alim Ormeci, Ulrich Burkhardt, Karsten Rasim, Sven Titlbach, Marc Armbrüster, Stephan A. Schunk, Yuri Grin   +8 more
doaj   +1 more source

Epoxidação do óleo de mamona e derivados empregando o sistema catalítico VO(acac)2/TBHP Epoxidation of castor oil and its derivatives using VO(acac)2/TBHP as the catalytic system

Química Nova, 2008
The alternative system VO(acac)2/TBHP was investigated for the epoxidation reaction of castor oil and its derivatives. Results of 88% of conversion, 73% of epoxidation and 82% of selectivity were obtained for the system containing 20% excess of TBHP and ...
Marta Regina dos Santos Nunes, Marcia Martinelli, Marcelo Monteiro Pedroso   +2 more
doaj   +1 more source

In situ formation of catalytically active graphene in ethylene photo-epoxidation. [PDF]

, 2018
Ethylene epoxidation is used to produce 2 × 107 ton per year of ethylene oxide, a major feedstock for commodity chemicals and plastics. While high pressures and temperatures are required for the reaction, plasmonic photoexcitation of the Ag catalyst ...
Heo, Jaeyoung, Jain, Prashant K, Kumari, Gayatri, Zhang, Xueqiang   +3 more
core   +1 more source

Advancing from MOFs and COFs to Functional Macroscopic Porous Constructs

Advanced Materials, EarlyView.
This review study investigates the recent progress and methodologies for manufacturing metal–organic framework (MOF) or covalent–organic framework (COF)‐based 3D structured macroscopic porous constructs with high structural integrity, providing the possibility to control their porosity across dimensions.
Seyyed Alireza Hashemi, Ahmadreza Ghaffarkhah, Ali Akbar Isari, Mahyar Panahi‐Sarmad, Feng Jiang, Orlando J. Rojas, Stefan Wuttke, Mircea Dincă, Mohammad Arjmand   +8 more
wiley   +1 more source

A continuous protocol for the epoxidation of olefins, monocyclic terpenes, and Alpha Beta Unsaturated Carbonyl Synthons using eco-friendly Flow Reactor Conditions

Results in Engineering, 2022
Herein, we report a simple synthetic protocol for selective epoxidation of olefins, monocyclic terpenes, and chalcones using a continuous semi-batch process in good to excellent yields.
Chidambaram R. Ramaswamy, Imam Kopparapu, Amol Raykar, Abhijeet Kulkarani, Vijaya Sankar A V, Siva Ayyanar, Akula Nagarjuna, Ravi Kumar Cheedarala   +7 more
doaj  

Harnessing Synergistic Cooperation of Neighboring Active Motifs in Heterogeneous Catalysts for Enhanced Catalytic Performance

Advanced Materials, EarlyView.
This review examines the critical role of neighboring active motifs in heterogeneous catalysts, emphasizing how their synergistic cooperativity can be rationally designed to modulate catalytic properties. The discussion centers on the modulation of electronic and geometric structures, categorizing the catalytic systems into metal‐acid (Brønsted/Lewis ...
Peng Yuan, Ching Kit Tommy Wun, Tsz Woon Benedict Lo   +2 more
wiley   +1 more source

Glutaraldehyde-crosslinked Rhizopus oryzae whole cells show improved catalytic performance in alkene epoxidation

Microbial Cell Factories, 2023
Background Existing methods for alkene epoxidation are based on lipase-catalysed perhydrolysis. However, the inactivation of the expensive lipase enzyme is problematic for enzymatic epoxidation at large scales due to the use of hydrogen peroxide and ...
Lili Xu, Yimin Qin, Yufeng Song, Aixing Tang, Youyan Liu   +4 more
doaj   +1 more source

Heterogenisation of ketone catalysts within mesoporous supports for asymmetric epoxidation

, 2013
The synthesis of the first mesoporous silica (150 Å) anchored carbohydrate-derived chiral ketone is described. This new heterogeneous catalyst has been shown to be effective in the asymmetric epoxidation of olefins by oxone.
Adam, Aggarwal, Amadori, Amadori, Armstrong, Beckwith, Bellamy, Bloch, Caprio, Chadwick, Cho, Corey, Denmark, Denmark, Denmark, Dondoni, Farina, Frohn, Goeddel, Heitbaum, Hutchings, Jacobsen, Johansson Seechurn, Johnson, Johnson, Jones, Katsuki, McMorn, Page, Page, Pedragosa-Moreau, Raja, Raynor, Ren, Romesberg, Ross, Sartori, Shephard, Shu, Song, Stearman, Thomas, Thomas, Thomas, Tian, Tian, Tian, van den Broek, Wang, Wang, Wang, Wang, Wong, Wong, Xia, Xiong, Xuereb, Yang, Yang, Zhao, Zhu   +60 more
core   +1 more source

Oxidoperoxidomolybdenum(VI) complexes with acylpyrazolonate ligands: synthesis, structure and catalytic properties [PDF]

, 2018
Oxidoperoxido–molybdenum(VI) complexes containing acylpyrazolonate ligands were obtained by reaction of [Mo(O)(O)2(H2O)n] with the corresponding acylpyrazolone compounds HQR.
Begines, Emilio, Carrasco Carrasco, Carlos Jesús, Galindo del Pozo, Agustín, Marchetti, Fabio, Montilla Ramos, Francisco Javier, Pettinari, Claudio, Pettinari, Riccardo, Álvarez González, Eleuterio   +7 more
core   +1 more source

Direct Access to α,β‐Unsaturated γ‐Lactams via Palladium‐Catalysed Carbonylation of Propargylic Ureas.

Advanced Synthesis &Catalysis, Volume 367, Issue 5, March 4, 2025.
Abstract Additive carbonylations typically necessitate strong nucleophiles, such as alcohols or amines. In this study, we carbonylated a poorly nucleophilic urea, under oxidant‐free conditions. Our straightforward carbonylative strategy enables access to versatile α,β‐unsaturated γ‐lactams featuring an aminocarbonyl fragment, utilizing readily ...
Debora Schiroli, Aleksandr Voronov, Francesco Pancrazzi, Nunzio Iraci, Salvatore Vincenzo Giofrè, Beatrice Macchi, Valeria Stefanizzi, Raffaella Mancuso, Bartolo Gabriele, Paolo Pio Mazzeo, Luca Capaldo, Nicola Della Ca'   +11 more
wiley   +1 more source