Kinetics study of catalytic wet oxidation of phenol over novel ceria promoted mesoporous silica supported Ru-Fe3O4 catalyst

Roy, Shyamal; Mondal, Dilip Kumar

doi:10.1016/j.cherd.2022.03.045

Cited by 12 publications

(4 citation statements)

References 50 publications

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“…If the value of C WP ≫ 1, internal diffusion limits the reaction severely. C WP was found to be 1.95 × 10 –5 (<1), which denotes the absence of diffusion resistance and concentration differences within the pores of the prepared catalyst …”

Section: Results and Discussionmentioning

confidence: 99%

Performance of Mesoporous Ceria-Supported Pt Catalysts for Oxidative Degradation of Aqueous Solution of Toxic Phenol in a Continuous Fixed Bed Reactor: Optimization of Reaction Conditions, Kinetics, Catalyst Stability, and Characterization

Barman,

Basu,

Roy

2023

Ind. Eng. Chem. Res.

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Section: Results and Discussionmentioning

confidence: 99%

Performance of Mesoporous Ceria-Supported Pt Catalysts for Oxidative Degradation of Aqueous Solution of Toxic Phenol in a Continuous Fixed Bed Reactor: Optimization of Reaction Conditions, Kinetics, Catalyst Stability, and Characterization

Barman,

Basu,

Roy

2023

Ind. Eng. Chem. Res.

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“…The C WP value was calculated to be 1.75×10 -5 , suggesting the absence of diffusion limitations and the absence of a concentration gradient with the catalyst pores. 42…”

Section: In Uence Of Reaction Temperature On Bpa Degradationmentioning

confidence: 99%

Unraveling the Structure-Dependent Activity of Ru/CeO2 Catalysts for Oxidative Degradation of Plastic Chemical Bisphenol A by Catalytic Wet Oxidation

Roy,

Barman

2024

Preprint

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One of the important defects is the oxygen vacancy on metal oxide surfaces, and the defects function as the active sites in different catalytic reactions. Herein, Ru/CeO2-rod and Ru/CeO2-cube catalysts were prepared via the ESI method, and CeO2-rod and CeO2-cube supports were synthesized by hydrothermal processes. The activity of these catalysts was tested in a high-pressure fixed-bed reactor, and the oxidative degradation of industrial organic raffinate containing the plastic chemical bisphenol A (BPA) was compared with their oxygen vacancy concentration estimated after calcination. The Ru/CeO2-rod catalyst showed higher catalytic activity with 90% BPA conversion at 453 K, 30 bar, 0.5% Ru metal content, 15 O2 to BPA molar ratio, and 2 g-1.h-1 BPA feed WHSV. In contrast, 80% BPA degradation was achieved using the Ru/CeO2-cube catalyst under similar reaction conditions. The higher oxygen vacancy concentration and the higher interfacial surface area between metal and the support of the CeO2-rod supported Ru catalyst triggered the higher BPA degradation at low oxidation conditions. Besides, the atomic ratio, Ce3+/Ce4+, is lower in the Ru/CeO2-rod catalyst than that of the Ru/CeO2-cube catalyst, indicating the higher Ce4+ available in the catalyst, leading to the higher degradation of BPA. Moreover, the Ru/CeO2-rod catalyst possesses {111} planes that boost the generation of energetic Ru to improve the pursuit of the catalyst. The Weisz-Prater modulus and Thiele modulus values indicated that the surface reaction is the rate limitation step and there is no diffusion limitation. TEM, HRTEM, XPS, Raman, H2-TPR, XRD, CO chemisorption and BET surface area analyzers were used to characterize the catalysts.

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“…On the other hand, the impregnation of metal or metal oxide nanoparticles onto the mesopore surface is a very useful strategy to achieve high efficiency in the catalytic reaction. The obtained catalysts and photocatalysts, by immobilization of various metal species, proved a high activity in the oxidation of organic compounds [21][22][23][24][25][26] as phenol. 21,24,26 Among the metals immobilized on mesoporous silica, nickel has been less studied in oxidation reactions 22 or photocatalytic degradation of organic compounds.…”

Section: Introductionmentioning

confidence: 99%

“…The obtained catalysts and photocatalysts, by immobilization of various metal species, proved a high activity in the oxidation of organic compounds [21][22][23][24][25][26] as phenol. 21,24,26 Among the metals immobilized on mesoporous silica, nickel has been less studied in oxidation reactions 22 or photocatalytic degradation of organic compounds. 23 In these reactions SBA-15 is among the most studied mesoporous silica as support with high surface area and ordered mesoporous structure to immobilization of various metals, and the obtained materials were used as catalysts 26 or photocatalysts.…”

Section: Introductionmentioning

confidence: 99%

Morphological properties of ZnO nanostructures doped with Ag and Li for piezoelectric applications

CHELU,

ANASTASESCU,

CALDERON MORENO

et al. 2023

Rev.Roum.Chim.

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The development of a facile method to obtain materials with piezoelectric properties, through a green synthesis, as an alternative to lead-free materials, was the main objective of this work. Piezo active materials were grown by chemical methods on two types of metal substrates: Pt/Ti/SiO2/Si and the Ti foil. Ag and Li-doped ZnO nanostructures were prepared by hydrothermal method at low temperature on metallic substrates which were previously covered with ZnO seed layer deposited by spin coating sol-gel method. The newly prepared materials were covered with a polymer layer and were morphological characterized by atomic force microscopy (AFM) and scanning electron microscopy (SEM). The piezoelectric properties were estimated by measuring the direct piezoelectric coefficient d33. The test results show that the doped ZnO nanostructures synthesized using a green route exhibit a piezoelectric response so the established method can be considered a promising approach for obtaining piezoelectric materials on large surfaces. Piezo active nanostructures could be of interest for integration into piezoelectric devices.

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Kinetics study of catalytic wet oxidation of phenol over novel ceria promoted mesoporous silica supported Ru-Fe3O4 catalyst

Cited by 12 publications

References 50 publications

Performance of Mesoporous Ceria-Supported Pt Catalysts for Oxidative Degradation of Aqueous Solution of Toxic Phenol in a Continuous Fixed Bed Reactor: Optimization of Reaction Conditions, Kinetics, Catalyst Stability, and Characterization

Performance of Mesoporous Ceria-Supported Pt Catalysts for Oxidative Degradation of Aqueous Solution of Toxic Phenol in a Continuous Fixed Bed Reactor: Optimization of Reaction Conditions, Kinetics, Catalyst Stability, and Characterization

Unraveling the Structure-Dependent Activity of Ru/CeO2 Catalysts for Oxidative Degradation of Plastic Chemical Bisphenol A by Catalytic Wet Oxidation

Morphological properties of ZnO nanostructures doped with Ag and Li for piezoelectric applications

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