Articolele autorului Catalin Florin Petre
Link la profilul stiintific al lui Catalin Florin Petre

Anoxic alkaline oxidation of bisulfide by Fe/Ce oxide-hydroxide: Reaction pathway

The kinetics of the anoxic reaction between bisulfide and iron/cerium oxide-hydroxide was studied for alkaline pH [8.0-11.0] at 0.1 MPa and 298 K in a batch slurry reactor as a part and parcel of the surface chemistry in action in the oxidation of the total reduced sulfur pollutants in the pulp and paper atmospheric emissions. Bisulfide was converted into thiosulfate and polysulfides; while the leached divalent iron and thiosulfate dovetailed equimolarly

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Removal of Methyl Mercaptide by Iron/Cerium Oxide-Hydroxide in Anoxic and Oxic Alkaline Media

The oxidation of methyl mercaptide by Fe/Ce oxide-hydroxide was studied as a potential approach to deal with the methyl mercaptan contamination from total reduced sulfur (TRS) emissions in the pulp and paper industry. The reaction was studied in aqueous solutions at 22oC and different alkaline pH values (10.5-12) both in anoxic and oxic conditions. Mercaptide reactivity was strongly dependent on pH in anoxia, whereas in oxic conditions it was noticeably

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Cappilary electrophoretic separation of inorganic sulfur: sulfide, polysulfide and sulfur-oxygen species

A capillary electrophoresis protocol was developed for the identification and separation of inorganic polysulfides simultaneously with other inorganic sulfur-bearing species coexisting in aqueous hydrosulfide/sulfur solutions. The electrophoretic separation of thiosulfate, sulfate, hydrosulfide, sulfite, tetrathionate and polysulfide was achieved at pH values between 8.2 and 12.2. The peaks attributed to the polysulfide species were strongly sensitive

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Bifunctional Redox Iron/Cerium (Hydr)oxide Process for TRS Removal from Pulp & Paper Emissions

Hydrogen sulfide is the most abundant contaminant among the total reduced sulfur (TRS) quartet in the Kraft mill atmospheric emissions. An advantage of the association of oxygen with TRS in the pulp and paper effluents is exploited in a new bifunctional redox scrubbing process based on iron chemistry for the removal of hydrogen sulfide. As synthesized iron/cerium (hydr)oxide composite materials were tested at ambient and alkaline conditions in an

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Tailoring the pressure drop of structured packings through CFD simulations

A computational fluid dynamic methodology is proposed to breakdown into elementary dissipation mechanisms the overall single-phase gas flow bed pressure drop in towers containing corrugated sheet structured packings. The goal behind was to allow piecewise geometry optimization of such packings in terms of capacity enlargement and efficiency enhancement. The dissipations sorted in order of decreasing importance were the collision losses by jet streams

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Pressure drop through structured packings: breakdown into the contributing mechanisms by CFD modeling

Determination of dry pressure drops is often the preliminary diagnostic tool for characterizing structured packing-containing columns. One conventional approach that ushered in this area evolves around the use of Ergun expressions along with mandatory experimental pressure drops for the fitting of some empirical constants characterizing a given packing. This method is strictly representational, and incapable of predicting the impact on bed pressure

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