Decolorization of KN-R catalyzed by Fe-containing Y and ZSM-5 zeolites

Aiyin, Chen; Ma, Xiaodong; Sun, Hongwen

doi:10.1016/j.jhazmat.2007.12.059

Cited by 83 publications

(31 citation statements)

References 26 publications

(53 reference statements)

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“…To prepare porous catalysts with large surface areas, various methods can be used especially for immobilizing active species to porous supports through ion-exchange, impregnation, and precipitation [11]. Catalysts like transition metal ions (Fe, Co and Ni) impregnated carbon aerogels [12], Fe and Cu pilled clays [13][14][15], Fe-and Cu-exchange Y and ZSM-5 zeolites [16][17][18][19][20][21], and Cu-Silicalite-1 zeolite prepared by 0304-3894/$ -see front matter © 2010 Elsevier B.V. All rights reserved. doi:10.1016/j.jhazmat.2010.04.055 direct hydrothermal synthesis or by ionic exchange method [22] have been studied for the removal of different contaminants such as phenol and derivatives, dyes, carboxylic acids and MTBE by WHPCO processes.…”

Section: Introductionmentioning

confidence: 99%

Copper hydroxyphosphate as catalyst for the wet hydrogen peroxide oxidation of azo dyes

Zhan

Chen

2010

Journal of Hazardous Materials

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Section: Introductionmentioning

confidence: 99%

Copper hydroxyphosphate as catalyst for the wet hydrogen peroxide oxidation of azo dyes

Zhan

Chen

2010

Journal of Hazardous Materials

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“…It was observed, as expected, a decrease in conversion with pH values greater than 3, probably due to the lower stability of hydrogen peroxide, which decomposes into molecular oxygen instead of being used for generating the radicals. Moreover, under such conditions the formation of ferrous/ferric hydroxide complexes occurs, which lead to the deactivation of the ferrous catalyst [50]; moreover, the oxidation potential of the hydroxyl radical also decreases with increasing pH (2.65-2.80 at pH = 3 and 1.90 V at pH = 7) [11]. On the other hand, the decreased efficiency of the process at very acidic pH values may be related to the decreased generation of hydroxyl radicals, once the hydrogen peroxide forms the hydroperoxonium ion (H3O2 + ) by proton solvation, and therefore does not react with iron [5].…”

Section: Influence Of Phmentioning

confidence: 99%

“…This removal requires the inclusion of another stage in the treatment process, thus making it more expensive and complex [7]. To minimize these disadvantages, different forms to attach the iron species to a porous solid matrix (such as a zeolite, clay or activated carbon support) were studied -socalled heterogeneous Fenton-like process [5,8,[9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Heterogeneous Fenton’s oxidation using Fe/ZSM-5 as catalyst in a continuous stirred tank reactor

Queirós

Morais

Rodrigues

et al. 2015

Separation and Purification Technology

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This work is the first known report dealing with the heterogeneous Fenton-like process in a continuous stirred tank reactor. A Fe/ZSM-5 zeolite was used as catalyst for degradation of an azo dye (Orange II, OII)-containing solution.A parametric study was carried out to evaluate the effect of the main operating conditions in the basket reactor performance, namely temperature (in the range 10 - [H2O2]feed = 6 mM, W/Q = 200 mg.min/mL, dp2 and tresid = 90 min), it was achieved 91% of discoloration and 36% of mineralization, at steady-state. Moreover, it was found a removal of 29% in terms of the chemical oxygen demand (COD), being worth noting the improvement in the effluent biodegradability (k' -oxygen uptake rate -increased from 9.3 to 23.2 mgO2/(gVSS.h)) and the fact that the final effluent is non-toxic (0.0% of Vibrio fischeri inhibition).The stability of the catalyst performance was checked during five consecutive runs. The crucial factor for the catalyst long-term use is the leaching of iron, which in all runs reached very low levels (e.g. only 0.173 mg/L of iron for the run in the optimized conditions, corresponding to only 0.13% of leaching). The catalyst was characterized by different techniques before and after the reactions (namely SEM/EDS and N2 adsorption); textural and chemical transformations during its use can be considered negligible (except for very acidic conditions of pH = 1.5) favoring the catalytic stability of the Fe-zeolite.

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“…The most attention was paid in literature to Fe-containing zeolites with the MFI structure [8][9][10][11][12][13][14]. Fe-ZSM-5 zeolites comprising iron in tetrahedral positions in the zeolite matrix were established to be most active and stable among Fe-containing zeolites.…”

Section: Introductionmentioning

confidence: 99%

Cu and Fe-containing ZSM-5 zeolites as catalysts for wet peroxide oxidation of organic contaminants: reaction kinetics

et al. 2015

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The peroxide oxidation of model substrates (formic acid and phenol) was studied in the presence of copper-and iron-containing catalysts (0.5 % Cu-ZSM-5-30 and 0.65 % Fe-ZSM-5-30). The aim was to develop optimal kinetic models for describing the kinetics of peroxide oxidation. The real kinetics of phenol and formic acid oxidation in the presence of these catalysts at varied reaction parameters (concentrations and temperature) was studied. The copper-containing catalysts were more active to formic acid oxidation than the iron-containing catalyst over all the temperature range studied. The rate of destruction of pollutants decreases with a decrease in the H 2 O 2 concentration and the catalyst weight. The observed rate dependences on the initial substrate concentration appeared to be different for the substrate used. With formic acid, an increase of initial concentration leads to a slight increase in the reaction rate. In the case of phenol peroxide oxidation, the negative order with respect to the substrate concentration was observed. This may be explained by strong inhibition of the reaction rates by phenol and intermediates (hydroquinone, catechol, etc.) of its oxidation. The mathematical modeling of the kinetics was performed for various types of kinetic equations that correspond to different hypotheses on the kinetic reaction scheme. The selected & Oxana P. Taran oxanap@catalysis.ru 1 Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, 5 prosp.kinetic models based on logical kinetic schemes allowed describing the peroxide oxidation of model substrates at an appropriate accuracy.

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Decolorization of KN-R catalyzed by Fe-containing Y and ZSM-5 zeolites

Cited by 83 publications

References 26 publications

Copper hydroxyphosphate as catalyst for the wet hydrogen peroxide oxidation of azo dyes

Copper hydroxyphosphate as catalyst for the wet hydrogen peroxide oxidation of azo dyes

Heterogeneous Fenton’s oxidation using Fe/ZSM-5 as catalyst in a continuous stirred tank reactor

Cu and Fe-containing ZSM-5 zeolites as catalysts for wet peroxide oxidation of organic contaminants: reaction kinetics

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