Chemical vapor deposition of CuO on ZSM-5 membrane for catalytic wet peroxide oxidation of phenol in a fixed bed reactor

He, Donglin; Zhang, Huiping; Yan, Ying

doi:10.1039/c7ra09676c

Cited by 17 publications

(7 citation statements)

References 52 publications

(57 reference statements)

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“…9(c), the TOC conversion was reduced from 80% to 56% and from 77% to 32% when the feed flow was 1 and 2 mL/min, respectively. That lower feed flow rate accounted for the longer residence time between the active sites over catalysts and untreated solution, resulting in the generation of more efficient hydroxyl radicals 34 . As shown in Fig.…”

Section: Resultsmentioning

confidence: 89%

Kinetics study of CWPO of phenol wastewater over Cu‐ZSM‐5/PSSF catalysts prepared by ion‐exchanged method

Zhang

Yan

2022

J of Chemical Tech & Biotech

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BACKGROUND: Cu-ZSM-5 was prepared on paper-like sintered stainless steel fibers (PSSF) by ion-exchange method for the catalytic wet peroxide oxidation (CWPO) of phenol in a fixed bed reactor. The prepared Cu-ZSM-5/PSSF catalyst was characterized by scanning electron microscope (SEM), Brunner−Emmet−Teller (BET), X-ray diffraction (XRD), Fourier Transform InfraRed (FT-IR), Ultraviolet-visiblespectroscopy (UV-vis) and X-ray photoelectron spectroscopy (XPS). RESULTS:The XRD results showed that the ZSM-5 membrane was loaded well over PSSF with good crystallinity, even after the process of ion-exchange. The UV-vis inferred that isolated copper was the predominant species over ZSM-5 pores of the catalyst. Then, the effects of different catalyst bed heights, reaction temperatures, and feed flow rates on catalytic performance were investigated to obtain optimum reaction conditions. CONCLUSIONS: Finally, the catalytic reaction kinetics analysis over Cu-ZSM-5/PSSF catalyst were carried out with the Powerrate Law Kinetic model. The experimental results showed that the reaction order was the first-order reaction, and the activation energy of the oxidation reaction was Ea = 72.9 kJ/mol. The initial oxidation rate equation (−r A0 = 5.36 × 10 8 e −72 994/RT C A ) was obtained for phenol degradation using Cu-ZSM-5/PSSF catalyst.

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Section: Resultsmentioning

confidence: 89%

Kinetics study of CWPO of phenol wastewater over Cu‐ZSM‐5/PSSF catalysts prepared by ion‐exchanged method

Zhang

Yan

2022

J of Chemical Tech & Biotech

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“…For Cu/3.5Al and Cu/4.2Al, the critical flow rate was up to 4–6 ml/min. The optimized flow rate for the CWPO process in the FBR was usually chosen between 1 and 3 ml/min, which was always in the region of mass transfer control 24,27,30 . For MO degradation, internal and external mass transfer resistance showed a similar effect as that for H 2 O 2 decomposition (Figure 4b).…”

Section: Resultsmentioning

confidence: 94%

“…Catalytic performance of typical heterogeneous catalysts for the CWPO in the FBR and batch reactors has been listed in supporting information (Table S1,). Extruded zeolites, 15,18,20‐23 Al 2 O 3 , 24,25 SiO 2 , 26 and stainless steel fibers 27 have been applied as the substrate materials packed into FBR for pollutants degradation. In the FBR, high conversions (> 95%) of pollutants and total organic carbon removal (> 70%) can be achieved especially for phenol degradation 20,24,27 .…”

Section: Introductionmentioning

confidence: 99%

“…Extruded zeolites, 15,18,20‐23 Al 2 O 3 , 24,25 SiO 2 , 26 and stainless steel fibers 27 have been applied as the substrate materials packed into FBR for pollutants degradation. In the FBR, high conversions (> 95%) of pollutants and total organic carbon removal (> 70%) can be achieved especially for phenol degradation 20,24,27 . As listed in Table S1, the leaching amount of active metal Cu or Fe during the reaction is clearly over the 2 mg/L limit imposed by the directives of the European Union, 28 which restrains the catalysts for industrial application.…”

Section: Introductionmentioning

confidence: 99%

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Degradation of MO and H₂O₂ on Cu/γ‐Al₂O₃ pellets in a fixed bed reactor: Kinetics and transport characteristics

et al. 2020

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Pelletized Cu catalysts (Cu/γ-Al 2 O 3) with different diameters (d p = 1.1-4.2 mm) were prepared and examined kinetically for methyl orange (MO) degradation using a fixed bed reactor. A Cu/γ-Al 2 O 3 catalyst (d p = 2.3 mm) exhibited high degradation activity (Conv. MO > 95%) and superior leaching resistance (Cu leaching <0.6 mg/L in 200 hr). Apparent kinetics showed that both MO degradation and H 2 O 2 decomposition were mainly controlled by internal mass transfer. A plug-flow reactor model with masstransfer coefficients was developed, and a modified empirical correlation for external mass transfer (Sh = 1.5Re' 1.10 Sc 0.42) was proposed to accurately describe the species transport from/to the catalyst pellets in the low Reynolds number regime. The model was verified against conversions of pollutants degradation and H 2 O 2 decomposition separately in a fixed bed with relative errors <5% compared with experimental data; thus, it could be used as an effective tool for further design and optimization of reactor configuration and reaction conditions for the continuous catalytic wet peroxide oxidation process.

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“…Figure 8 depicts two well‐defined peaks at 932.5 and 952 eV for both the samples; that is, HCu(0.2 M)NZ and HCu(0.5 M)NZ could be assigned to Cu2p 3/2 and Cu2p 1/2 , respectively. A satellite peak is observed for the HCu(0.5 M)NZ at binding energy of 941–946 eV indicating that the copper ions are in bivalent form or it indicates the formation of CuO 64,65 . The satellite peaks have originated by the electron transfer from ligand's orbital to 3D orbital of copper.…”

Section: Resultsmentioning

confidence: 99%

Effect of copper on textural and acidic properties of hierarchical nanocrystalline ZSM‐5

P¹,

Kumari²,

Aneesh³

2020

Asia-Pacific J Chem Eng

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In this work, hierarchically porous nanocrystalline ZSM-5 was synthesized hydrothermally. Different concentrations of copper were incorporated into the matrix by ion exchange method. The synthesized samples were characterized by means of X-ray diffraction (XRD), Fourier-transform infrared (FTIR), energydispersive X-ray spectroscopy, scanning electron microscopy, X-ray photoelectron spectroscopy (XPS), ultraviolet (UV), 27 Al magic angle spinning nuclear magnetic resonance spectroscopy, and nitrogen sorption analysis. The acid sites on the surface of Cu-ZSM-5 have been systematically investigated using temperature-programmed desorption of ammonia (NH 3-TPD) and pyridine sorption followed by FTIR. The diffraction pattern obtained from XRD studies confirmed the typical Mobil Five. NH 3-TPD reveals the enhancement of acidity achieved by copper. The FTIR spectra of pyridine desorbed samples show that the intensity of bands corresponding to Lewis acidity increases by modification. The ZSM-5 zeolite samples exhibit spherical-shaped MFI crystal structure. The UV spectrum indicates that copper has been doped in the form of cations or in the form of oxides. XPS analysis confirms that the copper exists as Cu(I) and Cu(II). The nitrogen sorption isotherms reveal that the modified samples are mesoporous in nature. The pore volume and diameter were found to be enhanced by the modification. The better textural properties and acidic properties of the Cu-ZSM-5 can make it suitable for catalyzing organic reactions. K E Y W O R D S acidic and textural properties, copper, hierarchical nanocrystalline ZSM-5, ion exchange

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Chemical vapor deposition of CuO on ZSM-5 membrane for catalytic wet peroxide oxidation of phenol in a fixed bed reactor

Abstract: Complete removal of phenol and high TOC reduction (around 60%) can be achieved over CuO supported on ZSM-5 membrane.

Cited by 17 publications

References 52 publications

Kinetics study of CWPO of phenol wastewater over Cu‐ZSM‐5/PSSF catalysts prepared by ion‐exchanged method

Kinetics study of CWPO of phenol wastewater over Cu‐ZSM‐5/PSSF catalysts prepared by ion‐exchanged method

Degradation of MO and H₂O₂ on Cu/γ‐Al₂O₃ pellets in a fixed bed reactor: Kinetics and transport characteristics

Effect of copper on textural and acidic properties of hierarchical nanocrystalline ZSM‐5

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Chemical vapor deposition of CuO on ZSM-5 membrane for catalytic wet peroxide oxidation of phenol in a fixed bed reactor

Abstract: Complete removal of phenol and high TOC reduction (around 60%) can be achieved over CuO supported on ZSM-5 membrane.

Cited by 17 publications

References 52 publications

Kinetics study of CWPO of phenol wastewater over Cu‐ZSM‐5/PSSF catalysts prepared by ion‐exchanged method

Kinetics study of CWPO of phenol wastewater over Cu‐ZSM‐5/PSSF catalysts prepared by ion‐exchanged method

Degradation of MO and H2O2 on Cu/γ‐Al2O3 pellets in a fixed bed reactor: Kinetics and transport characteristics

Effect of copper on textural and acidic properties of hierarchical nanocrystalline ZSM‐5

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Degradation of MO and H₂O₂ on Cu/γ‐Al₂O₃ pellets in a fixed bed reactor: Kinetics and transport characteristics