Journal ArticleDOI
Copper Oxide Mounted on Activated Carbon as Catalyst for Wet Air Oxidation of Aqueous Phenol. 2. Catalyst Stability
TLDR
In this paper, the Sofnocarb A21 (5% CuO on activated carbon) was used for catalytic wet air oxidation of phenol and it was found that no copper leaching took place in the experiments using fresh catalyst, when the initial phenol concentration was lower than 1.5 kg/m3.Abstract:
Stability aspects of the Sofnocarb A21 catalyst (5% CuO on activated carbon) have been studied for catalytic wet air oxidation of phenol. The study focused on copper leaching, the main factor affecting the catalyst stability. It was found that no copper leaching took place in the experiments using fresh catalyst, when the initial phenol concentration was lower than 1.5 kg/m3. Nevertheless, copper leaching and fouling were observed through consecutive experiments reusing the catalyst, leading to deactivation of catalyst and therefore a lower phenol oxidation rate. The main reaction intermediates, namely acetic acid and p-benzoquinone, together with polymeric products are highlighted to be responsible for copper leaching and fouling. Nonetheless, the leaching of active substance measured for Sofnocarb A21 was much lower than those found for other catalysts (G-66 A, Sud Chemie, Germany) also used for catalytic decomposition of phenol. Basic conditions were demonstrated to be useful to prevent both copper lea...read more
Citations
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Journal ArticleDOI
Wet Oxidation and Catalytic Wet Oxidation
TL;DR: In this paper, the authors explored three major aspects of the wet oxidation and catalytic wet oxidation (WO) processes, with the major focus being on WO and CWO, using air or oxygen as an oxidant.
Journal ArticleDOI
Sulfate radicals-based advanced oxidation technology in various environmental remediation: A state-of-the–art review
U. Ushani,Xueqin Lu,Wang Jianhui,Zhongyi Zhang,Jin-Jin Dai,Yujie Tan,Shasha Wang,Wanjiang Li,Chengxin Niu,Teng Cai,Na Wang,Guangyin Zhen +11 more
TL;DR: In this paper, a broad evaluation analysis intended in this review established its mesmerizing ascendancies over the conventional persulfate oxidation process with respect to rapid, more efficient, broad pH range and outstanding reaction.
Journal ArticleDOI
Carbon materials and catalytic wet air oxidation of organic pollutants in wastewater
TL;DR: The use of carbon materials as catalytic support or direct catalyst in catalytic wet air oxidation (WAO) of organic pollutants is reviewed in this paper, where important engineering aspects including the characterisation, activity and stability of carbon catalysts, process performance, reaction kinetics and reactor modelling are discussed.
Journal ArticleDOI
Heterogeneous catalytic wet peroxide oxidation systems for the treatment of an industrial pharmaceutical wastewater.
TL;DR: Assessment of the treatment of wastewater coming from a pharmaceutical plant through a continuous heterogeneous catalytic wet peroxide oxidation (CWPO) process using an Fe(2)O(3)/SBA-15 nanocomposite catalyst indicates that the catalyst shows high activity in terms of TOC mineralization, which enhances its biodegradability, and favours the possibility of a subsequent coupling with a conventional biological treatment.
Journal ArticleDOI
Modified activated carbons for catalytic wet air oxidation of phenol
TL;DR: In this paper, two commercial activated carbons were used both as received and modified by treatment with either HNO3, (NH4)2S2O8,o r H 2O2 and by demineralisation with HCl.
References
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Journal ArticleDOI
Wet air oxidation
TL;DR: Wet air oxidation (WAO), involving oxidation at high temperature (125-320 C) and pressure (0.5-20 MPa) conditions, is useful for the treatment of hazardous, toxic, and nonbiodegradable waste streams as mentioned in this paper.
Journal ArticleDOI
Catalytic oxidation of organics in aqueous solutions. I : Kinetics of phenol oxidation
A. Pintar,Janez Levec +1 more
TL;DR: In this paper, a semi-batch liquid phase liquid phase oxidation of phenol in an aqueous solution was studied in a semibatch slurry reactor and a solid catalyst comprising ZnO, CuO, and A1203 was found to be effective for converting phenol to nontoxic compounds via different intermediate products at pressures slightly above atmospheric and temperatures below 130°C.
Journal ArticleDOI
Catalytic oxidation of aqueous solutions of organics. An effective method for removal of toxic pollutants from waste waters
Janez Levec,Albin Pintar +1 more
TL;DR: In this article, a potential, advanced waste water treatment technology for liquid phase oxidation of aqueous solutions of organics is presented, followed by mechanistic speculations and kinetics.
Journal ArticleDOI
Catalytic liquid-phase oxidation of aqueous phenol solutions in a trickle-bed reactor
TL;DR: In this paper, the results obtained in the presence of a catalyst composed of supported copper, zinc, and cobalt oxides show that only small amounts of aromatic and aliphatic hydrocarbons are accumulated in the liquid phase, thus resulting to a constant pH value of the aqueous solution along the axial reactor coordinate.
Journal ArticleDOI
Catalytic oxidation of aqueous p-chlorophenol and p-nitrophenol solutions
Albin Pintar,Janez Levec +1 more
TL;DR: In this paper, the authors studied the catalytic liquid-phase oxidation of aqueous solutions of substituted phenols (p -chlorophenol and p -nitrophenol) in a differential, liquid-full operated fixed bed reactor.
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