scholarly journals Acceleration of oxidation process of iron in supercritical water containing dissolved oxygen by the formation of H2O2

AIP Advances ◽  
2018 ◽  
Vol 8 (8) ◽  
pp. 085104
Author(s):  
Caili Zhang ◽  
Jianguo Li ◽  
Zhuxia Zhang ◽  
Nan Dong ◽  
Jian Wang ◽  
...  
Keyword(s):  
Dissolved Oxygen ◽  
Supercritical Water ◽  
Oxidation Process

scholarly journals The simultaneous removal of bisphenol A, manganese and ammonium from groundwater by MeOx: The role of chemical catalytic oxidation for bisphenol A

2021 ◽  
Author(s):  
Yingming Guo ◽  
Ben Ma ◽  
Jianxiong Huang ◽  
Jing Yang ◽  
Ruifeng Zhang
Keyword(s):  
Oxide Film ◽  
Bisphenol A ◽  
Dissolved Oxygen ◽  
Oxidation Process ◽  
Pilot Scale ◽  
Simultaneous Removal ◽  
Chemical Forms ◽  
Synergy Effect ◽  
Iron And Manganese

Abstract The iron and manganese oxide filter film (MeOx) were used to research the simultaneous removal of bisphenol A (BPA), manganese (Mn2+) and ammonium (NH4+) in a pilot-scale filter system. We found that 0.52 mg/L of BPA could be removed while consuming 5.44 mg/L of dissolved oxygen (DO). Since the oxidation process of NH4+ and BPA both consume the DO in water, the presence of NH4+ can hinder the removal of BPA. The presence of Mn2+ in water had a synergy effect on the BPA removal. The filter film was characterized by SEM, XRD and XPS. Some substances were generated to block the pores of the oxide film, and a small amount of film was found to crack and fall off. The elemental composition of C and O were both increased by about 9%, the composition of Mn was decreased from 63.48% to 44.55%, and the reduced manganese substance might affect the activity of the oxide film. The main chemical forms of MeOx are Mn6O12·3H2O, MnFe2O4 or Mn3O4. The decrease in the removal efficiency of BPA was mainly due to the C-containing intermediate [−CH2C − H(OH)]n covering the surface of the oxide film and blocking the pore size of the film.

Oxidation of Austenitic Steel TP347HFG Exposed to Supercritical Water with Different Dissolved Oxygen Concentration

2011 ◽  
Vol 148-149 ◽  
pp. 1179-1183 ◽  
Author(s):  
Nai Qiang Zhang ◽  
Bao Rang Li ◽  
Yang Bai ◽  
Hong Xu
Keyword(s):  
Grain Size ◽  
Weight Gain ◽  
Dissolved Oxygen ◽  
Oxygen Concentration ◽  
Supercritical Water ◽  
Outer Layer ◽  
Oxidation Behavior ◽  
Sample Surface ◽  
Dissolved Oxygen Concentration ◽  
Fine Grained

The oxidation of austenitic fine-grained steel TP347HFG exposed to supercritical water at 550 °C and 25 MPa with the dissolved oxygen concentration of 100 ppb, 300 ppb and 2000 ppb was investigated. The results indicated weight gain increased with the dissolved oxygen increasing. The herpes-shaped oxides were formed on the sample surface. The oxide layer was a typical dual-layered structure with a Fe-rich outer layer and a Fe-Cr-Ni-rich inner layer. The influences of the dissolved oxygen concentration and grain size on oxidation behavior were discussed finally.

Effect of Thermal Pretreatment on the Corrosion of Stainless Steel in Flowing Supercritical Water

2015 ◽  
Vol 2 (1) ◽  
Author(s):  
Yinan Jiao ◽  
Joseph R. Kish ◽  
Graham Steeves ◽  
William G. Cook ◽  
Wenyue Zheng ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Dissolved Oxygen ◽  
Oxide Scale ◽  
Supercritical Water ◽  
Intermetallic Phase ◽  
Compositional Variation ◽  
Gravimetric Analysis ◽  
Type 316L

The effect of high-temperature microstructure degradation (thermal ageing) on the corrosion resistance of austenitic stainless steels in supercritical water (SCW) was evaluated in this study. Mill-annealed (MA) and thermally treated (TT) samples of Type 316L and Type 310S stainless steel were exposed in 25 MPa SCW at 550°C with 8 ppm dissolved oxygen in a flowing autoclave testing loop. The thermal treatments applied to Type 316L (815°C for 1000 hr + water quench) and Type 310S (800°C for 1000 hr + air cool) were successful in precipitating the expected intermetallic phases in each alloy, both within the grains and on the grain boundaries. It was found that a prolonged time at relatively high temperature was sufficient to suppress significant compositional variation across the various intermetallic phase boundaries. This paper presents the results of the gravimetric analysis and oxide scale characterization using scanning electron microscopy (SEM) coupled with X-ray energy-dispersive spectroscopy (EDS). The role played by the fine precipitate structure on formation of the oxide scale, and thus corrosion resistance, is discussed. The combined role of dissolved oxygen and flow (revealed by examining the differences between Type 316L samples exposed in a static autoclave and in the flowing autoclave loop) is also addressed. It was concluded that formation of intermetallic phase precipitates during high-temperature exposure is not likely to have a major effect on the apparent corrosion resistance because of the discontinuous nature of the precipitation.

The role of dissolved oxygen in supercritical water in the oxidation of ferritic–martensitic steel

2016 ◽  
Vol 108 ◽  
pp. 56-60 ◽  
Author(s):  
Zhongliang Zhu ◽  
Hong Xu ◽  
Dongfang Jiang ◽  
Guoqiang Yue ◽  
Baorang Li ◽  
...  
Keyword(s):  
Dissolved Oxygen ◽  
Supercritical Water ◽  
Martensitic Steel

The effect of dissolved oxygen on the oxidation of an austenitic steel in supercritical water

2022 ◽  
pp. 1-9
Author(s):  
Xu Yang ◽  
Guangmin Xu ◽  
Chang Che ◽  
Zhongliang Zhu ◽  
Xinzhong Chen ◽  
...  
Keyword(s):  
Dissolved Oxygen ◽  
Austenitic Steel ◽  
Supercritical Water

Corrosion of TP347HFG in Supercritical Water with Different Dissolved Oxygen Content

2013 ◽  
Vol 19 (8) ◽  
pp. 2440-2443 ◽  
Author(s):  
Nai-Qiang Zhang ◽  
Zhong-Liang Zhu ◽  
Qian Zhang ◽  
Bao-Rang Li ◽  
Hong Xu
Keyword(s):  
Dissolved Oxygen ◽  
Oxygen Content ◽  
Supercritical Water
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