![]() Moreover, by recognizing the common reaction mechanisms of simple organic molecules, we can understand how more complex systems react, including the much larger molecules encountered in biochemistry. In designing the synthesis of a molecule, such as a new drug, for example, chemists must be able to understand the mechanisms of intermediate reactions to maximize the yield of the desired product and minimize the occurrence of unwanted reactions. Identifying transient intermediates enables chemists to elucidate reaction mechanisms, which often allows them to control the products of a reaction. Understanding why organic molecules react as they do requires knowing something about the structure and properties of the transient species that are generated during chemical reactions. To understand the relationship between structure and reactivity for a series of related organic compounds.Read more about how to correctly acknowledge RSC content. ![]() Permission is not required) please go to the Copyright If you want to reproduce the wholeĪrticle in a third-party commercial publication (excluding your thesis/dissertation for which If you are the author of this article, you do not need to request permission to reproduce figuresĪnd diagrams provided correct acknowledgement is given. Provided correct acknowledgement is given. If you are an author contributing to an RSC publication, you do not need to request permission Please go to the Copyright Clearance Center request page. To request permission to reproduce material from this article in a commercial publication, Provided that the correct acknowledgement is given and it is not used for commercial purposes. This article in other publications, without requesting further permission from the RSC, Pérez-Ramírez,Ĭreative Commons Attribution-NonCommercial 3.0 Unported Licence. Finally, we show that the carrier (activated carbon versus nitrogen-doped carbon) does not affect the catalytic response, but determines the deactivation mechanism (gold particle aggregation and pore blockage, respectively), which opens up different options for the development of stable, high-performance hydrochlorination catalysts.Ĭontrolling the speciation and reactivity of carbon-supported gold nanostructures for catalysed acetylene hydrochlorination Strong interaction with HCl and thermodynamically favoured acetylene activation were identified as the key features of the Au( I)Cl sites that endow their superior catalytic performance in comparison to N-stabilised Au( III) counterparts and gold nanoparticles. The results indicate that the activity of gold-based catalysts correlates with the population of Au( I)Cl single atoms and the reaction follows a Langmuir–Hinshelwood mechanism. By combining steady-state experiments, density functional theory, and transient mechanistic studies, we assess the relation between the metal speciation, electronic properties, and catalytic activity. While on activated carbon particle aggregation occurs progressively above 473 K, on nitrogen-doped carbon gold single atoms exhibit outstanding stability up to temperatures of 1073 K and under reaction conditions. Herein, we present a platform of carbon supported gold nanostructures at a fixed metal loading, ranging from single atoms of tunable oxidation state and coordination to metallic nanoparticles, by varying the structure of functionalised carbons and use of thermal activation. However, the design of an optimal catalyst is essentially hindered by the difficulties in assessing the nature of the active site. Carbon-supported gold catalysts have the potential to replace the toxic mercuric chloride-based system applied industrially for acetylene hydrochlorination, a key technology for the manufacture of polyvinyl chloride.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |