Studies on the catalytic destruction of 1,2-dichlorobenzene were carried out on a specially constructed semi-technical equipment whose most important element was a catalytic reactor with a monolithic catalyst in the form of 150 x 150 x 100 mm cubes. A catalyst made from cordierite with an active layer composed of Al2O3 - 64 wt%, TiO2 - 26 wt%, V2O5 - 6.6 wt% and WO3 - 3.4 wt% was used. The reactor made it possible to carry out the process in the temperature range 150-350 degrees C, at variable catalyst loading and different velocities of gas flow through the reactor. The content of 1,2-dichlorobenzene in the air was analysed by a chromatographic method. A significant effect of catalyst loading and temperature on 1,2-dichlorobenzene destruction efficiency was observed and no effect of the linear flow velocity through the catalyst on o-dichlorobenzene destruction efficiency was reported. The applied vanadium-tungsten catalyst on a monolithic carrier made from TiO2/gamma-Al2O3 revealed very good activity that resulted in an over 80% efficiency of 1,2-dichlorobenzene destruction at the temperature around 250 degrees C at a very high catalyst loading reaching ca. 8200 h(-1). Additionally, in this study the kinetics of 1,2-dichlorobenzene decomposition was determined, specifying the order of reaction and dependence of the decomposition rate constant on temperature, using a simple power-rate law model.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.chemosphere.2006.05.097 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Thioether-NHC bidentate manganese complexes as efficient phosphine-free catalysts for hydrogenation at room temperature.
Chem Commun (Camb)
January 2025
University of Strasbourg Institute for Advanced Study (USIAS), Strasbourg, France.
A series of four original phosphine-free thioether-NHC manganese complexes have been synthesised and fully characterized. These complexes have been applied as efficient catalysts for the hydrogenation of alkenes and ketones at room temperature, with low catalyst loadings (TON up to 900).
View Article and Find Full Text PDFScale-Up of Continuous Metallaphotoredox Catalyzed C-O Coupling to a 10 kg-Scale Using Small Footprint Photochemical Taylor Vortex Flow Reactors.
Org Process Res Dev
January 2025
School of Chemistry, The University of Nottingham, University Park, Nottingham NG7 2RD, U.K.
We report the development and optimization of a scalable flow process for metallaphotoredox (Ir/Ni) C-O coupling, a mild and efficient approach for forming alkyl-aryl ethers, a common motif in medicinal and process chemistry settings. Time-resolved infrared spectroscopy (TRIR) highlighted the amine as the major quencher of the photocatalyst triplet excited state, along with the formation of an Ir(II) species that, in the presence of the Ni cocatalyst, has its lifetime shortened, suggesting reductive quenching of Ir(III)*, followed by reoxidation facilitated by the Ni cocatalyst. TRIR and batch reaction screening was used to develop conditions transferrable to flow, and many processing benefits of performing the reaction in flow were then demonstrated using a simple to construct/operate, small-footprint FEP coil flow reactor, including short (<10 min) space times and reduced catalyst loadings (down to 0.
View Article and Find Full Text PDFAlkyl zinc complexes derived from formylfluorenimide ligands: synthesis, characterization and catalysis for hydroboration of aldehydes and ketones.
Dalton Trans
January 2025
Key Laboratory of Functional Molecular Solids, Ministry of Education, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, 241002, China.
Five new alkyl zinc complexes supported by different formylfluorenimide ligands were prepared and characterized. Complex 1 was obtained by the reaction of 9-[N(CH)-Cy-NCH]Fl (Cy = 2-cyclohexyl) (Fl = fluorenylL1 with diethylzinc (ZnEt) in tetrahydrofuran. Reacting 9-[2-pyridyl-CH-NCH]Fl L2 with ZnEt in tetrahydrofuran yielded complex 2.
View Article and Find Full Text PDFHigh-performance anionic stereogenic-at-cobalt(III) complex/halide salts/oxone catalytic system for enantioselective halocyclization of olefins.
Chem Commun (Camb)
January 2025
Department of Applied Chemistry, Anhui Province Engineering Laboratory for Green Pesticide Development and Application, and Anhui Province Key Laboratory of Crop Integrated Pest Management, Anhui Agricultural University, Hefei 230036, China.
A high-performance anionic stereogenic-at-cobalt(III) complex/oxone catalytic system was developed for various enantioselective intramolecular halocyclizations of olefins using halide salts as halogen sources, delivering structurally diverse halogenated heterocyclic compounds with outstanding stereoselectivity (up to 97 : 3 e.r.).
View Article and Find Full Text PDFSemi-Confinement Effect Enhances CH and CH Production in CO Electrocatalytic Reduction.
Small
January 2025
Key Laboratory of Marine Chemistry Theory and Technology (Ministry of Education), College of Chemistry & Chemical Engineering, Ocean University of China, 238 Songling Road, Qingdao, 266100, China.
Achieving fast conversion and precise regulation of product selectivity in electrochemical CO reduction reaction (CORR) remains a challenge. The space confinement effect provides a theoretical basis for the design of catalysts of different morphology and sizes and reveals the physical phenomena caused by the confinement of electrons and other particles at the nanoscale. In this work, a semi-confinement concept is introduced and a mesoporous silica nanosphere supported Cu catalyst (Cu-MSN) is prepared as a typical example to realize CORR enhancement and product selectivity regulation (methane vs ethylene).
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!