Photocatalytic decomposition of gaseous benzene at room temperature was studied with a fixed-bed annular reactor using titania as the photocatalyst. The effects of humidity, UV light intensity and benzene concentration on the conversion and mineralization of benzene were presented. Experimental results can be adequately described by using the Langmuir-Hinshelwood (L-H) kinetic model. The concentration distribution of benzene in the annular reactors of various dimensions can be described by combining the reactor design equation with L-H kinetics. Deactivation of catalyst was observed and attributed to the adsorption of reaction intermediates on TiO2 surface. The deactivated TiO2 catalyst could be photochemically regenerated by ozone-purging in the presence of humidity.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/s0304-3894(03)00169-9 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Two-Dimensional Layer {PMo} Clusters Constructed with N-Ligands for Bifunctional Properties of Proton Conduction and Supercapacitors.
Inorg Chem
January 2025
School of Chemistry and Environmental Engineering, Changchun University of Science and Technology, Changchun 130022, People's Republic of China.
Proton exchange membrane fuel cells (PEMFCs) are developing into very meaningful clean energy to fundamentally address environmental pollution. Among which the most studied Nafion series membranes are limited under large-scale use, and some strong oxidizing groups such as hydrogen peroxide will attack the structure of Nafion, shortening the lifespan of PEMFCs. Therefore, it is crucial to develop a proton-conductive material with strong stability and broad application.
View Article and Find Full Text PDF[Effects of By-products of Co-pyrolysis on Biochar for Benzene Vapor Adsorption Performance].
Huan Jing Ke Xue
January 2025
Department of Environmental Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China.
To explore the effects of the components in the raw materials and by-products of co-pyrolysis on the physicochemical properties of biochar, rice husk （RH, which has a high percentage of lignin and a low content of N） and sawdust （SD, which has a high percentage of both cellulose and N） were used as typical raw materials to prepare co-pyrolysis biochar. The benzene vapor adsorption performance of the obtained biochar was then tested on a fixed-bed device. At the same time, the by-product components generated during pyrolysis were analyzed using thermogravimetric （TG）, scanning electron microscopy （SEM）, and gas chromatography-mass spectrometry （GC-MS）.
View Article and Find Full Text PDFπ-Lewis Base Activation of Carbonyls and Hexafluorobenzene.
Angew Chem Int Ed Engl
December 2024
Saarland University, Coordination Chemistry, Campus C 4.1, 66123, Saarbrücken, GERMANY.
We report hitherto elusive side-on η2-bonded palladium(0) carbonyl (anthraquinone, benzaldehyde) and arene (benzene, hexa-fluorobenzene) palladium(0) complexes and present the catalytic hydrodefluorination of hexafluorobenzene by cyclohexene. The comparison with respective cyclohexene, pyridine and tetrahydrofuran complexes reveals that the experimental ligand binding strengths follow the order THF < C6H6 < C6F6 < cyclohexene < pyridine < benzaldehyde < anthraquinone. To understand this surprising order, the complexes' electronic structures were elucidated by nuclear magnetic resonance (NMR), single crystal X-Ray diffraction (sc-XRD), ultraviolet/visible (UV/Vis) electronic absorption, infrared (IR) vibrational, Pd L3-edge X-ray absorption (XAS), and X-ray photoelectron (XP) spectroscopic techniques, complemented by Density Functional Theory (DFT) calculations including energy decomposition (EDA-NOCV) and effective oxidation state (EOS) analyses.
View Article and Find Full Text PDFSynthesis, Reactivity and Aromatic Characteristics of Porphyrinoids Derived from -Alkylcarbaporphyrin-2-Carbaldehydes: Isolation of Nickel(II) and Palladium(II) Complexes, Weakly Diatropic 21-Oxycarbaporphyrins and Strongly Aromatic Trioxycarbaporphyrins.
J Org Chem
December 2024
Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, United States.
Acid catalyzed condensation of -alkyltripyrranes with trialdehydes derived from 1,3-cyclopentadiene or methyl-1,3-cyclopentadiene, followed by oxidation with aqueous ferric chloride solutions, gave 23-alkyl-21-carbaporphyrin-2-carbaldehydes in 22-27% yield together with weakly aromatic oxycarbaporphyrins. The carbaporphyrins reacted with palladium(II) acetate or nickel(II) acetate to give organometallic complexes but in both cases alkyl group migration took place to generate 21-alkyl derivatives. Although this type of reactivity had been observed previously for palladium complexes, this is the first time the phenomenon has been seen in nickel(II) carbaporphyrins.
View Article and Find Full Text PDFThe impact of additives on the nanoscale structures of spin-cast polymer composite films, particularly in polymer solar cells, is a topic of significant interest. This study focuses on the blend film comprising poly(thieno[3,4-]thio-phene--benzodi-thio-phene) (PTB7) and [6,6]-phenyl-C-butyric acid methyl ester (PCBM), exploring how additives like 1,8-di-iodo-octane (DIO) influence the film structures spin-cast from chloro-benzene solution. Combined results of specular X-ray and neutron reflectivity, grazing-incidence small- and wide-angle X-ray scattering (GISAXS and GIWAXS), and X-ray photoelectron spectroscopy indicate that DIO could significantly enhance the dispersion of PCBM and reduce composition inhomogeneity in the film.
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!