Category Ranking
98%
Total Visits
921
Avg Visit Duration
2 minutes
Citations
20
Article Abstract
The effect of the suppport on oxidative dehydrogenation activity for vanadia/ceria systems is examined for the oxidation of methanol to formaldehyde by use of well-defined VO(x)/CeO(2)(111) model catalysts. Temperature-programmed desorption at low vanadia loadings revealed reactivity at much lower temperature (370 K) as compared to pure ceria and vanadia on inert supports such as silica. Density functional theory is applied and the energies of hydrogenation and oxygen vacancy formation also predict an enhanced reactivity of the vanadia/ceria system. At the origin of this support effect is the ability of ceria to stabilize reduced states by accommodating electrons in localized f-states.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1021/ja910574h | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Reactivity of -Hydroxyphenyl Units in Enzymatic Co-Oxidative Coupling of -Coumaryl and Coniferyl Alcohols.
J Agric Food Chem
September 2025
Institute of Agriculture, Tokyo University of Agriculture and Technology, Tokyo 183-8509, Japan.
The -hydroxyphenyl (H) unit is an aromatic structure found in lignin, particularly abundant in compression wood and grass, and is derived from the incorporation of -coumaryl alcohol (-CMA). Although the structural and biosynthetic aspects of lignin have been extensively studied, the polymerization reactivity of H-unit during lignification remains poorly understood. In this study, horseradish peroxidase (HRP)-catalyzed homo- and co-oxidative coupling reactions (initial stage of enzymatic dehydrogenative polymerization) with -CMA and/or coniferyl alcohol (CA) were performed to investigate monolignol consumption, dilignol formation, and their potential involvement in subsequent polymerization.
View Article and Find Full Text PDFIndirect Friedländer Reaction: From Transfer Hydrogenation to Acceptorless Dehydrogenative Coupling and Metal-Free Approaches.
Chem Rec
September 2025
Chemical Sciences and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology (CSIR-NIIST), Thiruvananthapuram, 695019, India.
The Friedländer quinoline synthesis represents a fundamental method for the construction of quinoline derivatives, a versatile class of heterocyclic compounds widely prevalent in pharmaceuticals and materials science. This synthesis traditionally involves the condensation of 2-aminoaryl ketones with carbonyl compounds, typically ketones or aldehydes, in the presence of an acid or base under reflux conditions. However, recent advancements have highlighted indirect approaches (starting from 2-aminobenzyl alcohol) to achieve the same quinoline framework, offering distinct advantages in selectivity, substrate scope, and functional group tolerance.
View Article and Find Full Text PDFCO Adsorbates Induced Framework-Associated Low-Valence Co Sites in Co-ZSM-5 for Ethane Dehydrogenation.
J Am Chem Soc
September 2025
State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Chang Ping, Beijing 102249, China.
The dynamic structural evolution of heterogeneous catalysts is a ubiquitous phenomenon that has attracted a lot of interest. Catalyst reconstruction can occur after appropriate pretreatment, resulting in more efficient active catalysts, which is an attractive but challenging issue. Here, we reveal a CO activation strategy that controls the microenvironment of the Co sites in the high-silica Co-ZSM-5 catalyst (denoted as 0.
View Article and Find Full Text PDFElectrochemical dehydrogenative α-vinylation and α-allylation of cyclic β-ketoesters.
Chem Commun (Camb)
September 2025
School of Chemistry & Materials Science, Jiangsu Normal University, Xuzhou, 221116, China.
Electrochemical dehydrogenative α-vinylation of cyclic β-ketoesters using 1,1-disubstituted alkenes is reported, producing a diverse range of α-vinyl cycloketones in good yields under oxidant-free conditions. When allylsilanes are used as alkene components, the reaction proceeds through a dual dehydrogenative and desilylative pathway, resulting in the formation of α-allyl cycloketones with good efficiency. This electrochemical strategy provides a unified approach for constructing all-carbon quaternary centers two distinct α-functionalization processes.
View Article and Find Full Text PDFPhotochemical H dissociation for nearly quantitative CO reduction to ethylene.
Science
September 2025
State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China.
Producing olefins by carbon dioxide (CO) hydrogenation is a long-standing goal. The usual products are multicarbon mixtures because the critical step of heterolytic hydrogen (H) dissociation at high temperatures complicates selectivity control. In this study, we report that irradiating gold-titanium dioxide at 365 nanometers induces heterolytic H dissociation at ambient temperature.
View Article and Find Full Text PDF