Comments on "Phenol oxidation in supercritical water: formation of dibenzofuran, dibenzo-p-dioxin, and related compounds"

1992 ◽  
Vol 26 (9) ◽  
pp. 1849-1850 ◽  
Author(s):  
Kathleen C. Swallow ◽  
William R. Killilea
Keyword(s):  
Supercritical Water ◽  
Phenol Oxidation ◽  
Water Formation ◽  
Related Compounds

Phenol oxidation in supercritical water

1990 ◽  
Vol 3 (4) ◽  
pp. 240-248 ◽  
Author(s):  
Thomas D. Thornton ◽  
Phillip E. Savage
Keyword(s):  
Supercritical Water ◽  
Phenol Oxidation

scholarly journals Supercritical water oxidation of phenol and process enhancement with in situ formed Fe2O3 nano catalyst

2021 ◽  
Author(s):  
Ammar Al-Atta ◽  
Farooq Sher ◽  
Abu Hazafa ◽  
Ayesha Zafar ◽  
Hafiz M. N. Iqbal ◽  
...  
Keyword(s):  
Phenolic Compounds ◽  
Supercritical Water ◽  
Water Oxidation ◽  
Phenol Oxidation ◽  
Average Particle ◽  
Supercritical Water Oxidation ◽  
Study Objective ◽  
Cod Reduction ◽  
Nano Catalyst

AbstractDuring the past few decades, the treatment of hazardous waste and toxic phenolic compounds has become a major issue in the pharmaceutical, gas/oil, dying, and chemical industries. Considering polymerization and oxidation of phenolic compounds, supercritical water oxidation (SCWO) has gained special attention. The present study objective was to synthesize a novel in situ Fe2O3nano-catalyst in a counter-current mixing reactor by supercritical water oxidation (SCWO) method to evaluate the phenol oxidation and COD reduction at different operation conditions like oxidant ratios and concentrations. Synthesized nano-catalyst was characterized by powder X-ray diffraction (XRD) and transmission electron microscope (TEM). TEM results revealed the maximum average particle size of 26.18 and 16.20 nm for preheated and non-preheated oxidant configuration, respectively. XRD showed the clear peaks of hematite at a 2θ value of 24, 33, 35.5, 49.5, 54, 62, and 64 for both catalysts treated preheated and non-preheated oxidant configurations. The maximum COD reduction and phenol oxidation of about 93.5% and 99.9% were observed at an oxidant ratio of 1.5, 0.75 s, 25 MPa, and 380 °C with a non-preheated H2O2 oxidant, while in situ formed Fe2O3nano-catalyst showed the maximum phenol oxidation of 99.9% at 0.75 s, 1.5 oxidant ratio, 25 MPa, and 380 °C. Similarly, in situ formed Fe2O3 catalyst presented the highest COD reduction of 97.8% at 40 mM phenol concentration, 1.0 oxidant ratio, 0.75 s residence time, 380 °C, and 25 MPa. It is concluded and recommended that SCWO is a feasible and cost-effective alternative method for the destruction of contaminants in water which showed the complete conversion of phenol within less than 1 s and 1.5 oxidant ratio.

Phenol oxidation kinetics in supercritical water

1998 ◽  
Vol 13 (1-3) ◽  
pp. 241-246 ◽  
Author(s):  
Yoshito Oshima ◽  
Kazuhide Hori ◽  
Masaki Toda ◽  
Thammanayakatip Chommanad ◽  
Seiichiro Koda
Keyword(s):  
Supercritical Water ◽  
Oxidation Kinetics ◽  
Phenol Oxidation

Phenol oxidation pathways in supercritical water

1992 ◽  
Vol 31 (11) ◽  
pp. 2451-2456 ◽  
Author(s):  
Thomas D. Thornton ◽  
Phillip E. Savage
Keyword(s):  
Supercritical Water ◽  
Phenol Oxidation
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