Bioethanol Steam Reforming over Cobalt-Containing USY and ZSM-5 Commercial Zeolite Catalysts

Grzybek, Gabriela; Greluk, Magdalena; Tarach, Karolina A.; Pyra, Kamila; Słowik, Grzegorz; Rotko, Marek; Góra‐Marek, Kinga

doi:10.3389/fmats.2020.597528

Cited by 10 publications

(6 citation statements)

References 76 publications

(98 reference statements)

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“…The interpretation of the results obtained for bare manganese support requires a comparison of both the spectrum recorded for the as-calcined sample and after ESR reaction. This is important, as bare support was rather inactive in the ESR [18], whereas the survey spectrum suggests almost 55 at.% coverage of the surface by carbon-containing species. This result seems less surprising when one notes that the atomic contribution of adventitious carbon species on the surface of the calcined sample is equal to 39 at.%.…”

Section: The Effect Of Potassium Doping On Prevention Of the Cobalt-b...mentioning

confidence: 98%

“…Because the low surface area of support does not facilitate the dispersion of metal particles, both Co/MnO x and KCo/MnO x catalysts exhibit a large Co 0 particle size (see also Supplementary Materials, Figure S1). The slightly larger size of Co 0 particles for KCo/MnO x catalysts results from the agglomeration of the initially formed cobalt species crystallites of the Co/MnOx catalyst during its second calcination, after impregnation with potassium salt [18]. STEM-EDS maps of samples, after their reduction with hydrogen at 500 • (Figures 2 and 3), reveal a comparatively homogenous cobalt dispersion on the MnO x support of both catalysts, as well as potassium accumulation on both MnO x and Co 0 particles for the K-doped sample.…”

Section: The Effect Of Potassium Doping On the Catalysts' Physicochem...mentioning

confidence: 99%

“…A limitation of the coke deposition might be also achieved by the addition of alkali promoters [16][17][18][19], which can significantly change both the structure and surface of the catalyst. The key role of alkali metal additives is dependent on the nature of the catalytic material, e.g., the type and crystallite size of the active phase, the phase composition and the morphology of the support.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Potassium Doping on the Structural and Catalytic Properties of Co/MnOx Catalyst in the Steam Reforming of Ethanol

Greluk,

Rotko,

Słowik

et al. 2023

Materials

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The promotional effect of potassium (~1.25 wt%) on a Co/MnOx catalyst was studied for samples prepared by the impregnation method in the steam reforming of ethanol (SRE) process at 420 °C for a H2O/EtOH molar ratio of 12/1. The catalysts were characterized using physicochemical methods to study their textural, structural, and redox properties. The XRD studies revealed that, during the treatment of both cobalt-based catalysts under a hydrogen atmosphere at 500 °C, Co0 and MnO phases were formed by the reduction in Co3O4 and Mn2O3/Mn3O4 phases, respectively. Potassium doping significantly improved stability and ability for the C–C bond cleavage of the Co/MnOx catalyst. The enhancement of activity (at ~25%) and selectivity to hydrogen (at ca. 10%) and the C1 product, mainly carbon dioxide (at ~20%), of the Co/MnOx catalyst upon potassium doping was clarified by the alkali promoter’s impact on the reducibility of the cobalt and manganese oxides. The microscopic observations revealed that fibrous carbon deposits are present on the surface of Co/MnOx and KCo/MnOx catalysts after the SRE reaction and their formation is the main reason these catalysts deactivate under SRE conditions. However, carbon accumulation on the surface of the potassium-promoted catalyst was ca. 12% lower after 18 h of SRE reaction compared to the unpromoted sample.

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Section: The Effect Of Potassium Doping On Prevention Of the Cobalt-b...mentioning

confidence: 98%

Section: The Effect Of Potassium Doping On the Catalysts' Physicochem...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Potassium Doping on the Structural and Catalytic Properties of Co/MnOx Catalyst in the Steam Reforming of Ethanol

Greluk,

Rotko,

Słowik

et al. 2023

Materials

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“…According to Contreras et al (2014) in their literature review about H 2 production by ethanol steam reforming (ESR), the catalysts based on Ni, Co, Fe, and Cu supported in different matrices are the most studied and much cheaper than catalysts based on noble metals. Grzybek et al (2020) reported Co-based catalysts supported on USY and ZSM-5 zeolites for ESR, in which both catalysts achieved a 100% ethanol conversion, meanwhile the Co/ZSM-5 catalyst exhibited high selectivity (75%). In any case, the selectivity to H 2 , CO 2 , and C 2 H 4 depended on the ethanol-water molar ratio and the catalytic activity was associated with the reoxidation of Co 0 /Co 2+ sites.…”

Section: Catalytic Processes With Transition Metals On Zeolitesmentioning

confidence: 99%

Recent Advances in Catalysis Based on Transition Metals Supported on Zeolites

et al. 2021

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This article reviews the current state and development of thermal catalytic processes using transition metals (TM) supported on zeolites (TM/Z), as well as the contribution of theoretical studies to understand the details of the catalytic processes. Structural features inherent to zeolites, and their corresponding properties such as ion exchange capacity, stable and very regular microporosity, the ability to create additional mesoporosity, as well as the potential chemical modification of their properties by isomorphic substitution of tetrahedral atoms in the crystal framework, make them unique catalyst carriers. New methods that modify zeolites, including sequential ion exchange, multiple isomorphic substitution, and the creation of hierarchically porous structures both during synthesis and in subsequent stages of post-synthetic processing, continue to be discovered. TM/Z catalysts can be applied to new processes such as CO2 capture/conversion, methane activation/conversion, selective catalytic NOx reduction (SCR-deNOx), catalytic depolymerization, biomass conversion and H2 production/storage.

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“…Finally, the Ni incorporated BEA zeolites with 5-15 wt.% of Ni loading were obtained after calcination. In addition, cobalt (Co) was supported on the super dealuminated ultrastabilized Y zeolite (USY) [59] and the mesoporous Y zeolite [60] by the IWI method using a cobalt(II) nitrate aqueous solution.…”

Section: Incorporation Of Metal Species Into Zeolite Supportsmentioning

confidence: 99%

Bioethanol Upgrading to Renewable Monomers Using Hierarchical Zeolites: Catalyst Preparation, Characterization, and Catalytic Studies

Iadrat

Wattanakit

2021

Catalysts

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Bioethanol is one of the most promising renewable resources for the production of important monomers. To date, there have been various processes proposed for bioethanol conversion to renewable monomers. In this review, the catalytic bioethanol upgrading to various types of monomers using hierarchical zeolites as catalysts is illustrated, including the recent design and preparation of hierarchical zeolites for these catalytic processes. The characterizations of catalysts including textural properties, pore architectures, acidic properties, and active species are also exemplified. Moreover, the catalytic studies with various processes of monomer production from bioethanol including bioethanol dehydration, bioethanol to hydrocarbons, and bioethanol to butadiene are revealed in terms of catalytic activities and mechanistic studies. In addition, the future perspectives of these catalytic circumstances are proposed in both economic and sustainable development contexts.

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Bioethanol Steam Reforming over Cobalt-Containing USY and ZSM-5 Commercial Zeolite Catalysts

Cited by 10 publications

References 76 publications

Effect of Potassium Doping on the Structural and Catalytic Properties of Co/MnOx Catalyst in the Steam Reforming of Ethanol

Effect of Potassium Doping on the Structural and Catalytic Properties of Co/MnOx Catalyst in the Steam Reforming of Ethanol

Recent Advances in Catalysis Based on Transition Metals Supported on Zeolites

Bioethanol Upgrading to Renewable Monomers Using Hierarchical Zeolites: Catalyst Preparation, Characterization, and Catalytic Studies

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