Topic
Wet oxidation
About: Wet oxidation is a research topic. Over the lifetime, 3094 publications have been published within this topic receiving 61536 citations.
Papers published on a yearly basis
Papers
More filters
TL;DR: In this article, RuO2/ZrO2-CeO2 was investigated in a stirred reactor at a reaction temperature of 200°C and total pressure of 4MPa.
47 citations
TL;DR: In this paper, the effects of the addition of hydroquinone as a free radical initiator and t -butanol as a scavenger on wet oxidation of phenol were studied in presence of this catalyst at near neutral conditions and also in a strongly alkaline medium.
47 citations
TL;DR: In this paper, the potential of using sludge based activated carbons (SBACs) for catalysing the wet air oxidation (WAO) of phenol, o-cresol and o-chlorophenol was assessed in both a batch slurry reactor and a continuous trickle-bed reactor.
Abstract: The potential of using sludge based activated carbons (SBACs) for catalysing the wet air oxidation (WAO) of phenol, o-cresol, o-chlorophenol and p-nitrophenol was assessed in both a batch slurry reactor and a continuous trickle-bed reactor. In the batch reactor, the activity of two powdered carbons prepared from, respectively, dewatered raw (DRAW) sludge and dewatered, mesophilic anaerobically digested (DMAD) sludge was tested at 160 °C and 4.2 bar of oxygen partial pressure. Continuous, trickle-bed reactor experiments of up to 72 h were conducted at similar operating conditions to study the durability and catalytic wet air oxidation (CWAO) performance of three economically promising steam activated SBACs. Due to their low mechanical strength, the two DRAW derived SBACs tested were produced using two different attrition resistance enhancement techniques. A commercial activated carbon (Chemviron, AP4-X) was employed as the reference catalyst for all of the tests. In the batch runs, the SBACs and AP4-X achieved high levels of pollutant conversion in the case of phenol, o-cresol and o-chlorophenol. However, irrespective of the carbon tested, p-nitrophenol was resistant to oxidation. When employed in the trickle-bed reactor, the DRAW derived SBAC pelletised using a lignosulphonate binder was found to be the most stable carbon. With this carbon the order of compound reactivity was as observed in the batch experiments.
47 citations
TL;DR: In this paper, the potential for wet oxidation (WO) processes to treat activated sludge under stoichiometric oxygen conditions was described, at temperatures ranging from 200 to 300°C at retention times of 10, 30 and 60 min.
47 citations
TL;DR: Wet oxidation was investigated as the pretreatment method to enhance the enzymatic digestibility of reed cellulose to soluble sugars and thus improve the convertibility ofreed to ethanol and the most effective treatment increased the digestibility by cellulases more than three times.
Abstract: Common reed (Phragmites australis) is often recognized as a promising source of renewable energy. However, it is among the least characterized crops from the bioethanol perspective. Although one third of reed dry matter is cellulose, without pretreatment, it resists enzymatic hydrolysis like lignocelluloses usually do. In the present study, wet oxidation was investigated as the pretreatment method to enhance the enzymatic digestibility of reed cellulose to soluble sugars and thus improve the convertibility of reed to ethanol. The most effective treatment increased the digestibility of reed cellulose by cellulases more than three times compared to the untreated control. During this wet oxidation, 51.7% of the hemicellulose and 58.3% of the lignin were solubilized, whereas 87.1% of the cellulose remained in the solids. After enzymatic hydrolysis of pretreated fibers from the same treatment, the conversion of cellulose to glucose was 82.4%. Simultaneous saccharification and fermentation of pretreated solids resulted in a final ethanol concentration as high as 8.7 g/L, yielding 73% of the theoretical.
47 citations