Catalytic behaviour and copper leaching of Cu0.10Zn0.90Al1.90Fe0.10O4spinel for catalytic wet air oxidation of phenol

Xu, Aihua; Sun, Cheng

doi:10.1080/09593330.2011.626800

Cited by 8 publications

(4 citation statements)

References 19 publications

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“…In recent years, considerable efforts have been made to develop multicomponent materials for the decomposition of organic pollutants because of the remarkable reaction properties such as high surface areas, high melting points and multifunctionality that single metal oxides cannot realize [6][7][8][9][10][11][12][13]. Spinel oxides are a class of complex oxides with chemical formula AB 2 O 4 , containing the normal and inverse structures.…”

Section: Introductionmentioning

confidence: 99%

Degradation of polychlorinated biphenyls using mesoporous iron-based spinels

Huang¹,

Su²,

Zhang³

et al. 2013

Journal of Hazardous Materials

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h i g h l i g h t s• The NiFe 2 O 4 had the highest activity in degradation of CB-209, followed by Fe 3 O 4 .• Hydroxyl species, organic acids, PCBs and chlorobenzenes were identified as products.• Three degradation reactions and one combination reaction competitively occurred.• Hydrodechlorination of CB-209 was more favored over Fe 3 O 4 than NiFe 2 O 4 .• Oxidation reaction of CB-209 was more favored over t r a c tA series of mesoporous iron-based spinel materials were synthesized to degrade polychlorinated biphenyls (PCBs), with CB-209 being used as a model compound. The materials were characterized by X-ray powder diffraction (XRD), pore structure analysis, and X-ray photoelectron spectroscopy (XPS). A comparison of the dechlorination efficiencies (DEs) of the materials revealed that NiFe 2 O 4 had the highest DE, followed by Fe 3 O 4 . Newly produced polychlorinated biphenyls, chlorinated benzenes, hydroxyl species and organic acids were detected by gas chromatography-mass spectrometry, high performance liquid chromatography-mass spectrometry and ion chromatograph. Identification of the intermediate products indicates that three degradation pathways, hydrodechlorination, the breakage of C C bridge bond and oxidative reaction, accompanied by one combination reaction, are competitively occurring over the iron-based spinels. The relative amounts of produced three NoCB isomers were illustrated by the C Cl BDEs of CB-209 at meta-, para-and ortho-positions, and their energy gap between HOMO and LUMO. The consumption of the reactive oxygen species caused by the transformation of Fe 3 O 4 into Fe 2 O 3 in the Fe 3 O 4 reaction system, and the existence of the highly reactive O 2 −• species in the NiFe 2 O 4 reaction system, could provide a reason why the oxidation reaction was more favored over NiFe 2 O 4 than Fe 3 O 4 .

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Section: Introductionmentioning

confidence: 99%

Degradation of polychlorinated biphenyls using mesoporous iron-based spinels

Huang¹,

Su²,

Zhang³

et al. 2013

Journal of Hazardous Materials

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“…The decrease in copper leaching with reaction time can be explained using the previous studies according to which the dissolved copper may form complex compounds aer reacting with organic intermediates which are eventually removed with the heterogeneous catalyst. 28,29 The other reason may be the conversion of dissolved copper in insoluble form at a pH ranging from 6-8. 30 For conrmation, a few runs were conducted at ambient temperature in a beaker containing distilled water mixed with homogeneous copper salt to nd the extent of copper precipitation at the wastewater pH observed aer CWO runs.…”

Section: Leaching Of Metals From the Catalysts During Cwo Of Ww1 And Ww2mentioning

confidence: 99%

Performance assessment of activated carbon supported catalyst during catalytic wet oxidation of simulated pulping effluents generated from wood and bagasse based pulp and paper mills

Yadav

Garg

2017

RSC Adv.

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“…Typical metal catalysts are known to have leaching rates of 5–10 % or higher, which represents a substantial economic burden on any catalytic process. Similarly, some important processes such as waste water remediation, biofuel synthesis, and catalytic wet air oxidation reaction have also been marred by leaching of the active species. There are a few other commercially important reactions as well where leaching has been detected …”

Section: Introductionmentioning

confidence: 99%

Bi₂O₃@mSiO₂ as an Environmentally Benign and Sustainable Solid Acid Catalyst for Benzoylation of Aromatics: Impact of Silica Encapsulation on Catalyst Leaching and Reaction Synergy

Jain

Samant

2020

ChemistrySelect

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Leaching of active species is one of the major causes of catalyst deactivation. The accumulation of this leached species as chemical waste can be detrimental to the environment. In this study, a series of environmentally benign core-shell catalysts of type Bi 2 O 3 @mSiO 2 were synthesized to address these issues. The catalysts, varying in silica content and shell thickness, were characterized and evaluated for Friedel-Crafts benzoylation. Amongst them, Bi-4 (containing 71.8 % Bi 2 O 3 ), having shell thickness of ∼ 42 nm, showed the best response under optimized conditions. Textural analysis of Bi-4 confirmed the mesoporous nature of shell, with average pore diameter of ∼ 40 Å and surface area of 62 m 2 /g. During the reaction, the Bi 2 O 3 core was converted to BiOCl, which was easily recycled back to its original form. No leaching or any loss in catalytic activity was observed for the recycled catalyst during reuse. Thus, an inexpensive, reusable and environmentally benign catalyst is proposed.

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Catalytic behaviour and copper leaching of Cu_0.10Zn_0.90Al_1.90Fe_0.10O₄spinel for catalytic wet air oxidation of phenol

Cited by 8 publications

References 19 publications

Degradation of polychlorinated biphenyls using mesoporous iron-based spinels

Degradation of polychlorinated biphenyls using mesoporous iron-based spinels

Performance assessment of activated carbon supported catalyst during catalytic wet oxidation of simulated pulping effluents generated from wood and bagasse based pulp and paper mills

Bi₂O₃@mSiO₂ as an Environmentally Benign and Sustainable Solid Acid Catalyst for Benzoylation of Aromatics: Impact of Silica Encapsulation on Catalyst Leaching and Reaction Synergy

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Catalytic behaviour and copper leaching of Cu0.10Zn0.90Al1.90Fe0.10O4spinel for catalytic wet air oxidation of phenol

Cited by 8 publications

References 19 publications

Degradation of polychlorinated biphenyls using mesoporous iron-based spinels

Degradation of polychlorinated biphenyls using mesoporous iron-based spinels

Performance assessment of activated carbon supported catalyst during catalytic wet oxidation of simulated pulping effluents generated from wood and bagasse based pulp and paper mills

Bi2O3@mSiO2 as an Environmentally Benign and Sustainable Solid Acid Catalyst for Benzoylation of Aromatics: Impact of Silica Encapsulation on Catalyst Leaching and Reaction Synergy

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Catalytic behaviour and copper leaching of Cu_0.10Zn_0.90Al_1.90Fe_0.10O₄spinel for catalytic wet air oxidation of phenol

Bi₂O₃@mSiO₂ as an Environmentally Benign and Sustainable Solid Acid Catalyst for Benzoylation of Aromatics: Impact of Silica Encapsulation on Catalyst Leaching and Reaction Synergy