Catalytic behavior of Co/(Nanoβ-Zeolite) bifunctional catalysts for Fischer–Tropsch reactions

Espinosa, G.; Dominguez, J. M.; Morales-Pacheco, P.; Tobón, Arturo Cervantes; Aguilar, M.; Benítez, José Luis

doi:10.1016/j.cattod.2011.01.025

Cited by 30 publications

(15 citation statements)

References 23 publications

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“…Notably, the TPR profiles of the impregnated Co‐zeolite catalysts display only a single group of peaks around 350–400 °C. The TPR profiles of the Co‐containing zeolites are consistent with previous results and could be attributed to the reduction of small CoO x species located either on the external surface or inside the zeolite pores. The position of these peaks depends on the zeolite structure.…”

Section: Resultssupporting

confidence: 90%

“…Notably, the Co/ZSM‐5 zeolite also exhibits a small peak at 600 °C that can be assigned to the reduction of smaller Co oxide particles located in the narrower pores of this zeolite. The peaks attributed to the reduction of Co 2+ ions in the zeolite cationic positions are not observed; the reduction of these species would take place above 800 °C, as has been shown previously …”

Section: Resultssupporting

confidence: 64%

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The Role of Steric Effects and Acidity in the Direct Synthesis of iso‐Paraffins from Syngas on Cobalt Zeolite Catalysts

et al. 2015

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This study focuses on the effects of the localization of Co species, zeolite structure, and acidity on the performance of Co bifunctional catalysts promoted with Pt for the direct synthesis of iso‐paraffins from syngas. ZSM‐5, MOR, and BEA were chosen as zeolites with different structures and pore diameters. The catalysts were prepared either by incipient wetness impregnation or by the mechanical mixing of the zeolite with a conventional silica‐supported Co catalyst. The increase in the pore size and open character of the zeolite structure from ZSM‐5 to BEA resulted in a higher fraction of Co located inside the pores of the catalysts prepared by impregnation. The catalytic performance was affected strongly by the zeolite acidity, pore structure, and Co distribution between the pores and the external surface. The selectivity to short‐chain iso‐paraffins is affected principally by the zeolite acidity, whereas the selectivity to long‐chain branched hydrocarbons mostly depends on steric effects.

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Section: Resultssupporting

confidence: 90%

Section: Resultssupporting

confidence: 64%

The Role of Steric Effects and Acidity in the Direct Synthesis of iso‐Paraffins from Syngas on Cobalt Zeolite Catalysts

et al. 2015

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“…This indicates that calcium oxide is mainly well-distributed inside pores of H-beta zeolites, leading to the diminution of surface areas and micropore volumes of samples. This situation is similar to the Co-beta catalyst prepared by Espinosa et al [26].…”

Section: Textural and Base Properties Of Ca-betamentioning

confidence: 50%

A high effective adsorbent of NOx: Preparation, characterization and performance of Ca-beta zeolites

Chang

Guo

et al. 2013

Microporous and Mesoporous Materials

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“…After cobalt loading, BEA peaks were still observed in all catalysts but their intensities decreased due to the presence of cobalt oxide particles on the zeolites that scattered the X-rays and decreased in the reflected intensity. Espinosa et al (2011) reported decreases in diffraction peak heights of nanobeta-zeolites in proton form after impregnation with cobalt due to screening of X-rays by the cobalt oxide particles. The decrease in intensity was more evident with increased cobalt loading.…”

Section: Catalytic Testing Of Co/nabea Catalysts For Butane Hydrogenomentioning

confidence: 99%

Effect of Crystallinity of Zeolite Beta on Physicochemical Properties and Performance of Cobalt Catalysts

Phatai¹,

Loiha²,

Prayoonpokarach³

et al. 2020

JSM

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In the present work, the effect of crystallinity of zeolite beta in a sodium form (NaBEA) on physicochemical properties and performance of NaBEA-supported cobalt catalysts was investigated. The incipient wetness impregnation method was utilized in the synthesis of NaBEA-supported cobalt catalysts with various Co loadings (4, 7 and 10 wt. %). NaBEA materials with high and low crystallinities (NaBEA-H and NaBEA-L) were synthesized using fumed silica with aging times of 72 and 48 h, respectively. In comparison to NaBEA-L, higher XRD peak intensities and surface area were observed for NaBEA-H. After impregnation, NaBEA-L displayed better dispersion of Co species and lower reducibility than NaBEA-H due to stronger metal-support interaction. Catalytic performance for n-butane hydrogenolysis via Co/ NaBEA-H and Co/NaBEA-L catalysts was compared. In butane hydrogenolysis, the higher conversion was attained using Co/NaBEA-H with 7 and 10 wt. % when compared to Co/NaBEA-L with similar loadings. Multiple hydrogenolysis occurred on all catalysts producing methane as the only product. The most effective catalyst was determined to be 7Co/ NaBEA-H due to the higher surface area and uniform particles of the cobalt species.

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Catalytic behavior of Co/(Nanoβ-Zeolite) bifunctional catalysts for Fischer–Tropsch reactions

Cited by 30 publications

References 23 publications

The Role of Steric Effects and Acidity in the Direct Synthesis of iso‐Paraffins from Syngas on Cobalt Zeolite Catalysts

The Role of Steric Effects and Acidity in the Direct Synthesis of iso‐Paraffins from Syngas on Cobalt Zeolite Catalysts

A high effective adsorbent of NOx: Preparation, characterization and performance of Ca-beta zeolites

Effect of Crystallinity of Zeolite Beta on Physicochemical Properties and Performance of Cobalt Catalysts

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