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, a uniform GexSi1−xO2 oxide layer formed with a smooth interface between it and the unoxidized gexSi 1−x layer below was monitored by backscattering spectrometry or cross-sectional transmission electronic microscopy.
Abstract: About 500‐nm‐thick films of Ge0.36Si0.64 and Ge0.28Si0.72 grown epitaxially on (100)Si have been oxidized at 700 °C in wet ambient. A uniform GexSi1−xO2 oxide layer forms with a smooth interface between it and the unoxidized GexSi1−x layer below. The composition and structure of that layer remains unchanged as monitored by backscattering spectrometry or cross‐sectional transmission electronic microscopy. The oxide of both samples grows as square root of oxidation duration. The parabolic rate constant increases with the Ge content and is larger than that for wet oxidation of pure Si at the same temperature. The absence of a regime of linear growth at this relatively low temperature indicates a much enhanced linear rate constant.
57 citations
TL;DR: Al-Cu pillared clays showed excellent activity toward the catalytic wet peroxide oxidation (CWPO) of reactive dyes as mentioned in this paper, which was achieved within 20min at atmospheric pressure and 80°C.
57 citations
TL;DR: In this article, the activity of supported ceria catalysts for the catalytic wet air oxidation of phenol was investigated using an autoclave reactor, and the results indicated that the support and the Ce content are both important factors affecting phenol conversion, whereas the BET surface area had no appreciable effect.
Abstract: The activity of several supported ceria catalysts for the catalytic wet air oxidation of phenol was investigated using an autoclave reactor. Results indicated that the support and the Ce content are both important factors affecting phenol conversion, whereas BET surface area had no appreciable effect. CeO 2 /γ-Al 2 O 3 was found to be the most active catalyst among the five tested. This superior activity was verified by O 2 -temperature programming desorption (O 2 -TPD), showing that CeO 2 /γ-Al 2 O 3 had the most exchangeable structure O 2 (capping O 2 ), and by H 2 -temperature programming reduction (H 2 -TPR), showing that it had the highest H 2 consumption (the most H 2 -reducible Ce species in the catalyst). For the CeO 2 /γ-Al 2 O 3 catalyst, the optimal Ce content was about 20 wt.%. X-ray diffraction (XRD) analysis and evaluation of full width at half maximum (FWHM, 2 θ =28.5°) of the XRD pattern showed that formation of larger crystals of CeO 2 at Ce content above 20 wt.% caused a decrease in the catalytic activity of CeO 2 /γ-Al 2 O 3 . The superior activity of CeO 2 /γ-Al 2 O 3 at 20 wt.% Ce content was confirmed by O 2 -TPD. The results of O 2 -TPD and H 2 -TPR of CeO 2 /γ-Al 2 O 3 with various Ce contents showed that not all the H 2 -reducible Ce species were associated with capping O 2 . Using the optimal CeO 2 /γ-Al 2 O 3 catalyst (loading 3.0 g/l), about 100% phenol conversion and 80% chemical oxygen demand (COD) removal was achieved after 2 h reaction at 180 °C and 1.5 MPa O 2 partial pressure. Although the efficacy of CeO 2 /γ-Al 2 O 3 is somewhat less than that of pure CeO 2 , the much lower cost of the former renders it a feasible catalyst for the catalytic wet air oxidation (CWAO) of phenol.
56 citations
TL;DR: In this article, the effects of temperature and catalyst dosage on the pollutant (chemical oxygen demand or COD) removal were investigated for desizing wastewater, a typical high strength industrial wastewater, by catalytic wet air oxidation (WAO).
Abstract: Treatment of desizing wastewater, a typical high strength industrial wastewater, by catalytic wet-air oxidation (WAO) is studied. The desizing wastewater sample was obtained from a large textile dyeing and finishing plant. Experiments were conducted to investigate the effects of temperature and catalyst dosage (CuSO4 and CU(NO3)2) on the pollutant (chemical oxygen demand or COD) removal. It is observed that over 80% of the COD removal can be realized in an hour of the catalytic WAO process. A kinetic model was also developed and a two-stage, first-order kinetic expression was found to represent well the treatment reaction. The correlations between the reaction rate coefficients and the temperature and catalyst dosage were also determined.
55 citations
TL;DR: In this paper, the treatment of dyeing and printing wastewater from the textile industry by oxidation was studied, and experiments were conducted using various catalysts including metal salts, metal oxides, and porous alumina supported metals.
55 citations