Shop : Details
Shop
Details
Colin Awungacha Lekelefac
Development of a photocatalytic reaction system to gain raw materials from lignin derivatives
Wood biomass consists of cellulose (40–50%), lignin (16–33%), hemicelluloses (15–30%), and a variety of extractives (1–10%). After cellulose, lignin is the most abundant renewable carbon source on earth. More than 70 million tons of various types of lignin preparations are produced as waste material by the paper industry yearly. Moreover, lignin represents the only viable source to produce aromatic compounds as fossil fuel alternative.
Photocatalysis, belonging to the advanced oxidation processes (AOPs), is a potential new transformation technology for lignin derivatives to value added products such as phenol, benzene, toluene and xylene amongst others.
The goal of this work was to develop a photocatalytic reaction system which could effectively depolymerize lignin into value added chemicals such as phenolic derivatives or thermosets like phenolic resins and thus propose a processing concept for lignin conversion.
This work reports the synthesis of immobilized catalyst via the sol-gel route on porous glass support material. A comparative study is done regarding the morphology of the coatings, degradation rates, reaction rates, dissolved carbon (DC), formation of peaks and fluorescence of product peaks formed from the photocatalytic degradation of lignin sulfonate obtained from a local paper plant. Through simultaneous reaction-extraction pathways applying dialysis filtration and a highly porous polystyrene divinylbenzene adsorbent resin (HR-P) for the solid phase extraction (SPE), an attempt was made to isolate smaller molecules produced from the photocatalytic degradation of lignin sulfonate. Moreover a relatively high concentrationof lignin sulfonate (0.5g/L) was used for the experiments. Ultraviolet-visible (UV-Vis) spectroscopy revealed a faster degradation of the aliphatic moiety compared to the aromatic moiety which constitutes lignin. New peaks were observed from High performance liquid chromatography (HPLC) analysis and some of these peaks showed signals when studied under fluorescence detection. This suggested the production of new substances and fluorophores. The catalytic coatings were done through the sol- gel procedure and they could be used many times.
Photocatalysis, belonging to the advanced oxidation processes (AOPs), is a potential new transformation technology for lignin derivatives to value added products such as phenol, benzene, toluene and xylene amongst others.
The goal of this work was to develop a photocatalytic reaction system which could effectively depolymerize lignin into value added chemicals such as phenolic derivatives or thermosets like phenolic resins and thus propose a processing concept for lignin conversion.
This work reports the synthesis of immobilized catalyst via the sol-gel route on porous glass support material. A comparative study is done regarding the morphology of the coatings, degradation rates, reaction rates, dissolved carbon (DC), formation of peaks and fluorescence of product peaks formed from the photocatalytic degradation of lignin sulfonate obtained from a local paper plant. Through simultaneous reaction-extraction pathways applying dialysis filtration and a highly porous polystyrene divinylbenzene adsorbent resin (HR-P) for the solid phase extraction (SPE), an attempt was made to isolate smaller molecules produced from the photocatalytic degradation of lignin sulfonate. Moreover a relatively high concentrationof lignin sulfonate (0.5g/L) was used for the experiments. Ultraviolet-visible (UV-Vis) spectroscopy revealed a faster degradation of the aliphatic moiety compared to the aromatic moiety which constitutes lignin. New peaks were observed from High performance liquid chromatography (HPLC) analysis and some of these peaks showed signals when studied under fluorescence detection. This suggested the production of new substances and fluorophores. The catalytic coatings were done through the sol- gel procedure and they could be used many times.
Schlagwörter: photocatalysis; lignin conversion; sol-gel process
Schriftenreihe des Institutes für Bioverfahrenstechnik und Pharmazeutische Technologie
Herausgegeben von Prof. Dr.-Ing Peter Czermak, Gießen
Band 3
Verfügbare Online-Dokumente zu diesem Titel
Sie benötigen den Adobe Reader, um diese Dateien ansehen zu können. Hier erhalten Sie eine kleine Hilfe und Informationen, zum Download der PDF-Dateien.
Bitte beachten Sie, dass die Online-Dokumente nicht ausdruckbar und nicht editierbar sind.
Bitte beachten Sie auch weitere Informationen unter: Hilfe und Informationen.
Bitte beachten Sie auch weitere Informationen unter: Hilfe und Informationen.
| Dokument |  | Gesamtdokument | ||
| Dateiart |  | |||
| Kosten |  | 34,35 € | ||
| Aktion |  | Zahlungspflichtig kaufen und anzeigen der Datei | ||
| Aktion |  | Zahlungspflichtig kaufen und download der Datei | ||
| Dokument |  | Inhaltsverzeichnis | ||
| Dateiart | | |||
| Kosten |  | frei | ||
| Aktion |  | Anzeigen der Datei | ||
| Aktion |  | Download der Datei | ||
Benutzereinstellungen für registrierte Online-Kunden (Online-Dokumente)
Sie können hier Ihre Adressdaten ändern sowie bereits georderte Dokumente erneut aufrufen.
Benutzer
Nicht angemeldet
Export bibliographischer Daten
Shaker Verlag GmbHAm Langen Graben 15a52353 Düren
Mo. - Do. 8:00 Uhr bis 16:00 UhrFr. 8:00 Uhr bis 15:00 Uhr
Kontaktieren Sie uns. Wir helfen Ihnen gerne weiter.
