Regeneration of a Coked Zeolite via Nonthermal Plasma Process: A Parametric Study

Pinard, Ludovic; Ayoub, Nadim; Batiot‐Dupeyrat, Catherine

doi:10.1007/s11090-019-09972-x

Cited by 14 publications

(10 citation statements)

References 15 publications

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“…It suggests that the reactive species generated by plasma are able to diffuse from the surface through the depth of the catalyst wafer or that plasma discharge is formed in the small space between the wafer and the dielectric material. It is supported by a previous study in which we showed that the coke was completely removed in the depth of wafer using coked zeolite material [23].…”

Section: Plasma Treatmentsupporting

confidence: 72%

Elimination of Coke in an Aged Hydrotreating Catalyst via a Non-Thermal Plasma Process: Comparison with a Coked Zeolite

et al. 2019

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The removal of coke from an aged industrial hydrodesulfurization catalyst, using dielectric barrier discharge (DBD) non-thermal plasma with a pin to plate geometry, was investigated. The aged catalyst was introduced into the plasma reactor as a thin wafer. After 130 minutes of plasma treatment, with P = 30 W, 70% of the coke was removed while more than 40% of the sulfur was still present. Characterization of catalyst at different locations of the wafer showed that the coke was more easily removed at the center, close to the pin electrode where the electric field was more intense. The formation of an unexpected phase, under the plasma discharge, was highlighted, it corresponded to the family of Keggin HPA PMo12O40 3−, which could be an interesting precursor of catalyst for the hydrodesulfurization (HDS) process. Compared with a coked zeolite, the rate of regeneration is lower for the HDS catalyst under plasma discharge, while a lower temperature is required under conventional thermal oxidation. This is explained by the presence of metal particles, which could be responsible for the limitation in O-atom formation under plasma.

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Section: Plasma Treatmentsupporting

confidence: 72%

Elimination of Coke in an Aged Hydrotreating Catalyst via a Non-Thermal Plasma Process: Comparison with a Coked Zeolite

et al. 2019

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“…Similarly to coke combustion and ozonation, this process is highly dependent of the catalyst structure due to the diffusion limitations, as demonstrated by Pinard et al who studied NTP catalyst regeneration over MFI, MOR, and FAU zeolites [113]. Different parameters, such as input power, gap between electrodes, gas flowrate and nature of diluent (N2, He, Ar), as well as catalyst mass and compactness, have been investigated to provide deeper understanding of this process, which remains a relatively new and unknown method despite its promising aspects [154]. [113] and (b) fixed-bed dielectric barrier discharge (DBD) reactor [153] for coked catalyst regeneration via NTP.…”

Section: Ozonationmentioning

confidence: 99%

Deactivation and Regeneration of Zeolite Catalysts Used in Pyrolysis of Plastic Wastes—A Process and Analytical Review

2021

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In catalytic industrial processes, coke deposition remains a major drawback for solid catalysts use as it causes catalyst deactivation. Extensive study of this phenomenon over the last decades has provided a better understanding of coke behavior in a great number of processes. Among them, catalytic pyrolysis of plastics, which has been identified as a promising process for waste revalorization, is given particular attention in this paper. Combined economic and environmental concerns rose the necessity to restore catalytic activity by recovering deactivated catalysts. Consequently, various regeneration processes have been investigated over the years and development of an efficient and sustainable process remains an industrial challenge. Coke removal can be achieved via several chemical processes, such as oxidation, gasification, and hydrogenation. This review focuses on oxidative treatments for catalyst regeneration, covering the current progress of oxidation treatments and presenting advantages and drawbacks for each method. Molecular oxidation with oxygen and ozone, as well as advanced oxidation processes with the formation of OH radicals, are detailed to provide a deep understanding of the mechanisms and kinetics involved (direct and indirect oxidation, reaction rates and selectivity, diffusion, and mass transfer). Finally, this paper summarizes all relevant analytical techniques that can be used to characterize deactivated and regenerated solid catalysts: XRD, N2 adsorption-desorption, SEM, NH3-TPD, elemental analysis, IR. Analytical techniques are classified according to the type of information they provide, such as structural characteristics, elemental composition, or chemical properties. In function of the investigated property, this overall tool is useful and easy-to-use to determine the adequate analysis.

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“…Helium revealed as significantly better energy carrier and allowed hence for reducing plasma treatment times considerably. [29][30][31] The scope of this contribution is to investigated NTP using O 2 /He mixtures as alternative template removal strategy, with the aim to preserve textural properties of the as-synthesized SBA-15 materials and hence to achieve new insights on its structure. To the best of our knowledge this is the first report that describes the use of NTP for Pluronic template removal in SBA-15.…”

Section: Introductionmentioning

confidence: 99%

Non-thermal plasma: A fast and efficient template removal approach allowing for new insights to the SBA-15 structure

Aumond

Pinard

Batiot‐Dupeyrat

et al. 2020

Microporous and Mesoporous Materials

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Non-thermal plasma has revealed as fast and efficient strategy for the complete elimination of template molecules from SBA-15 materials. Through comparing the textural properties of a set of SBA-15 materials obtained by classical calcination and non-thermal plasma treatment new insights to the SBA-15 structure could be revealed. As such, a third type of microporosity could be disclosed by the use of non-thermal plasma for SBA-15 synthesized at 60 °C. Additionally, starting from a synthesis temperature of 100 °C, template elimination through non-thermal plasma allows for preserving native textural properties of as-synthesized SBA-15. The developed alternative treatment combines the advantages of improved textural properties and higher silanol density, hence making the strategy very promising for superior applications of SBA-15 materials.

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Regeneration of a Coked Zeolite via Nonthermal Plasma Process: A Parametric Study

Cited by 14 publications

References 15 publications

Elimination of Coke in an Aged Hydrotreating Catalyst via a Non-Thermal Plasma Process: Comparison with a Coked Zeolite

Elimination of Coke in an Aged Hydrotreating Catalyst via a Non-Thermal Plasma Process: Comparison with a Coked Zeolite

Deactivation and Regeneration of Zeolite Catalysts Used in Pyrolysis of Plastic Wastes—A Process and Analytical Review

Non-thermal plasma: A fast and efficient template removal approach allowing for new insights to the SBA-15 structure

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