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| Open AccessOperando probing of the surface chemistry during the Haber–Bosch process
Using X-ray photoelectron spectroscopy, the surface composition of iron and ruthenium catalysts during ammonia synthesis at pressures up to 1 bar and temperatures as high as 723 K can be revealed.
- Christopher M. Goodwin
- , Patrick Lömker
- & Anders Nilsson
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Article |
Functional-group translocation of cyano groups by reversible C–H sampling
Using light-based, reversible C−H sampling catalysis, a cyano functional group can be swapped with a C−H bond in a molecule, providing access to valuable structures that are difficult to obtain by other methods.
- Ken Chen
- , Qingrui Zeng
- & Yan Xu
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Article |
Promoting active site renewal in heterogeneous olefin metathesis catalysts
The authors identify a dynamic site renewal and decay cycle, mediated by proton transfers involving proximal Brønsted acidic OH groups, which operates concurrently with the Chauvin cycle and could address roadblocks associated with industrial metathesis processes.
- Terry Z. H. Gani
- , Zachariah J. Berkson
- & Yuriy Román-Leshkov
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Organic reaction mechanism classification using machine learning
Mechanistic elucidation through currently available kinetic analysis is limited by mathematical approximations and human interpretation, here a deep neural network model has been trained to analyse ordinary kinetic data and automatically elucidate the corresponding mechanism class.
- Jordi Burés
- & Igor Larrosa
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Article |
Bifunctional hydroformylation on heterogeneous Rh-WOx pair site catalysts
Catalysts consisting of oxide-supported pair sites can enable bifunctional reaction mechanisms with high activity and selectivity for reactions and so overcome the limitations in industry imposed by the use of homogeneous catalysts.
- Insoo Ro
- , Ji Qi
- & Phillip Christopher
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Article |
Electron-catalysed molecular recognition
A simple and versatile strategy is established to facilitate molecular recognition by extending electron catalysis for use in supramolecular non-covalent chemistry.
- Yang Jiao
- , Yunyan Qiu
- & J. Fraser Stoddart
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Article |
Photoinduced copper-catalysed asymmetric amidation via ligand cooperativity
In the presence of three ligands and light, two distinct copper catalysts combine to produce enantioenriched secondary amides from racemic alkyl electrophiles and primary amide nucleophiles.
- Caiyou Chen
- , Jonas C. Peters
- & Gregory C. Fu
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Article |
Efficient epoxidation over dinuclear sites in titanium silicalite-1
A combination of spectroscopy, microscopy and theoretical calculations shows that the reactivity of titanium silicalite-1 as an epoxidation catalyst is due to the presence of dinuclear titanium sites.
- Christopher P. Gordon
- , Hauke Engler
- & Christophe Copéret
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Letter |
Low-barrier hydrogen bonds in enzyme cooperativity
Structural and biophysical studies reveal that low-barrier hydrogen bonds enable long-range communication between the active sites of multimeric enzymes and synchronise catalysis.
- Shaobo Dai
- , Lisa-Marie Funk
- & Kai Tittmann
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Letter |
Base-free nickel-catalysed decarbonylative Suzuki–Miyaura coupling of acid fluorides
This nickel-catalysed Suzuki–Miyaura coupling of aryl boronic acids with in-situ-generated acid fluorides does not require an exogenous base and is applicable to a range of base-sensitive boronic acids and bioactive carboxylic acids.
- Christian A. Malapit
- , James R. Bour
- & Melanie S. Sanford
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Letter |
Velocity-resolved kinetics of site-specific carbon monoxide oxidation on platinum surfaces
The catalytic oxidation of carbon monoxide over platinum proceeds through two distinct channels: it is dominated at low temperatures by the more active step sites and at high temperatures by the more abundant terrace sites of the platinum surface.
- Jannis Neugebohren
- , Dmitriy Borodin
- & Theofanis N. Kitsopoulos
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Letter |
High-spatial-resolution mapping of catalytic reactions on single particles
The chemical conversion of N-heterocyclic carbene molecules attached to catalytic particles is monitored at high spatial resolution using synchrotron-radiation-based infrared nanospectroscopy.
- Chung-Yeh Wu
- , William J. Wolf
- & Elad Gross
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Letter |
Catalyst support effects on hydrogen spillover
The mechanism of hydrogen spillover is described using a precisely nanofabricated model system, explaining why it is slower on an aluminum oxide catalyst support than on a titanium oxide catalyst support.
- Waiz Karim
- , Clelia Spreafico
- & Jeroen A. van Bokhoven
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Letter |
The active site of low-temperature methane hydroxylation in iron-containing zeolites
Iron-containing zeolites have an exceptional ability to convert methane into methanol, but their active site have been hard to study; now, magnetic circular dichroism has been used to explore the reactive species, providing a technique that should be generally applicable, and revealing the value of constraining active sites within a lattice to improve catalyst functionality.
- Benjamin E. R. Snyder
- , Pieter Vanelderen
- & Edward I. Solomon
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Letter |
Nanoscale intimacy in bifunctional catalysts for selective conversion of hydrocarbons
The conversion of hydrocarbons to produce high-quality diesel fuel can be catalysed by bifunctional materials that contain a metal site and an acid site; it has been assumed that these sites should be as close as possible in order to enhance catalysis, but it is now shown that having them too close together can be detrimental to selectivity.
- Jovana Zecevic
- , Gina Vanbutsele
- & Johan A. Martens
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Letter |
Catalytic functionalization of unactivated primary C–H bonds directed by an alcohol
The combination of an iridium-phenanthroline catalyst and a dihydridosilane reagent leads to the site-selective functionalization of primary C–H bonds that are proximal to a hydroxyl group.
- Eric M. Simmons
- & John F. Hartwig