Iridium/H-ZSM-5 zeolite catalyst promoted via hydrochlorination or hydrofluorination for the hydroconversion of cyclohexene

Aboul-Gheit, Ahmed K.; Aboul-Gheit, Noha A.K.

doi:10.1016/j.apcata.2006.01.015

Cited by 14 publications

(4 citation statements)

References 47 publications

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“…Under almost the same loading amount and temperature, the Pd supported on porous glass beads prepared by Shen et al showed a TOF of 1.54 min –1 with even pure cyclohexene as the liquid reactant. Besides, the Ir/H-ZSM-5 (HF) catalyst prepared by Aboul-Gheit et al has the best performance with the TOF of 1.97 min –1 at 125 °C. Therefore, the silica/chitosan core–shell hybrid-microsphere-supported Pd catalyst showed higher catalytic activity.…”

Section: Resultsmentioning

confidence: 99%

Silica/Chitosan Core–Shell Hybrid-Microsphere-Supported Pd Catalyst for Hydrogenation of Cyclohexene Reaction

Chen

et al. 2017

Ind. Eng. Chem. Res.

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This paper presents a simple microfluidic method to prepare monodispersed palladium nanoparticles supported on silica/ chitosan core−shell hybrid microspheres. Because a large amount of −NH 2 provided by chitosan has a strong force with metal ions, Pd nanoparticles loaded on the microspheres kept monodispersed and had a mean diameter of only 2−3 nm. In addition, the core−shell structure indicating that the chitosan was mainly distributed on the shell of the microspheres results in that palladium is mainly loaded on the shell too, which can effectively reduce mass transfer distance between reactant and catalyst. Therefore, the supported Pd catalyst showed a superb catalytic performance through the hydrogenation of cyclohexene. Furthermore, silica/chitosan-supported catalyst can be reused many times without an obvious loss of its activity, and it will have promising application in other similar hydrogenation reactions.

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Section: Resultsmentioning

confidence: 99%

Silica/Chitosan Core–Shell Hybrid-Microsphere-Supported Pd Catalyst for Hydrogenation of Cyclohexene Reaction

Chen

et al. 2017

Ind. Eng. Chem. Res.

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“…Second, only the Pd nanoparticles loaded on the outer part of the shell played a role during the reaction. Aboul-Gheit et al prepared an Ir/H-ZSM-5 zeolite catalyst for the hydroconversion of cyclohexene in a fixed-bed reactor at temperatures of 50–400 °C. Results showed that, with the increase of the temperature from 50 to 400 °C, the conversion of cyclohexene increased first and then decreased.…”

Section: Resultsmentioning

confidence: 99%

Size Control and Catalytic Activity of Highly Dispersed Pd Nanoparticles Supported on Porous Glass Beads

Shen

Wang

et al. 2012

Langmuir

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This paper presents a novel in situ method to prepare monodispersed palladium nanoparticles supported on porous glass beads with an egg-shell structure at room temperature. This method integrates two processes of ion exchange and reduction in one step just by changing the solvent from water to alcohol. The monodispersed Pd nanoparticles around 3.75 nm in diameter with a face-centered cubic structure have been successfully prepared. The adsorption capacity for palladium reached 55.00 ± 0.55 mg/g in ethanol, which was 26 times larger than that in water. These Pd nanoparticles supported on porous glass beads showed an excellent catalytic performance through the hydrogenation of cyclohexene. In addition, this in situ method was also successfully applied to prepare monodispersed silver and gold nanoparticles supported on porous glass beads. Overall, this facile method provided an alternative for preparing a supported nanoparticle catalyst in a green way.

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“…Considering the consecutive reaction mechanism of benzene hydrogenation on Ru-based catalysts and the virtually invariable TOFs on the Ru–B/ZrO 2 -M, Ru–B/ZrO 2 -A, and Ru–B/ZrO 2 -T catalysts irrespective of the distinct differences in the acidic properties of the supports (Table ), we suggest that successive hydrogenation of cyclohexene, produced by benzene hydrogenation on Ru–B nanoparticles, on the acid sites of the ZrO 2 supports determines or at least strongly influences the selectivity to cyclohexene on these catalysts. Notably, Aboul-Gheit et al observed that the hydrogenation of cyclohexene to cyclohexane was enhanced when the number of the acid sites was increased on the Pt/H-ZSM-5, , Ir/H-ZSM-5, and Re/H-ZSM-5 catalysts . Thus, it is expected that the difference in the selectivity to cyclohexene can be observed over Ru–B catalysts supported on ZrO 2 with different acidic properties, and the Ru–B/ZrO 2 catalyst with the lowest amount of acid sites will exhibit the highest selectivity to cyclohexene.…”

Section: Resultsmentioning

confidence: 99%

Effect of Support Acidity on Liquid-Phase Hydrogenation of Benzene to Cyclohexene over Ru–B/ZrO₂Catalysts

Zhou¹,

Liu²,

Tan³

et al. 2012

Ind. Eng. Chem. Res.

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Ru−B/ZrO 2 catalysts using monoclinic, amorphous, and tetragonal ZrO 2 as supports were prepared and used for liquid-phase hydrogenation of benzene to cyclohexene. It is identified that both the Lewis acid sites and the Brønsted acid sites existed on monoclinic ZrO 2 (ZrO 2 -M), while there were only Lewis acid sites on amorphous (ZrO 2 -A) and tetragonal ZrO 2 (ZrO 2 -T). The amount of acid sites on ZrO 2 -T was the lowest. In liquid-phase hydrogenation of benzene to cyclohexene, the Ru−B/ZrO 2 -T catalyst exhibited the highest selectivity and yield of cyclohexene, with the maximum yield of cyclohexene being 47%. These results suggest that for ZrO 2 -supported Ru−B catalysts, the lower was the amount of acid sites on ZrO 2 , the higher was the selectivity to cyclohexene. Also, the presence of the Brønsted acid sites on ZrO 2 is probably adverse to the selectivity toward cyclohexene.

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Iridium/H-ZSM-5 zeolite catalyst promoted via hydrochlorination or hydrofluorination for the hydroconversion of cyclohexene

Cited by 14 publications

References 47 publications

Silica/Chitosan Core–Shell Hybrid-Microsphere-Supported Pd Catalyst for Hydrogenation of Cyclohexene Reaction

Silica/Chitosan Core–Shell Hybrid-Microsphere-Supported Pd Catalyst for Hydrogenation of Cyclohexene Reaction

Size Control and Catalytic Activity of Highly Dispersed Pd Nanoparticles Supported on Porous Glass Beads

Effect of Support Acidity on Liquid-Phase Hydrogenation of Benzene to Cyclohexene over Ru–B/ZrO₂Catalysts

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Iridium/H-ZSM-5 zeolite catalyst promoted via hydrochlorination or hydrofluorination for the hydroconversion of cyclohexene

Cited by 14 publications

References 47 publications

Silica/Chitosan Core–Shell Hybrid-Microsphere-Supported Pd Catalyst for Hydrogenation of Cyclohexene Reaction

Silica/Chitosan Core–Shell Hybrid-Microsphere-Supported Pd Catalyst for Hydrogenation of Cyclohexene Reaction

Size Control and Catalytic Activity of Highly Dispersed Pd Nanoparticles Supported on Porous Glass Beads

Effect of Support Acidity on Liquid-Phase Hydrogenation of Benzene to Cyclohexene over Ru–B/ZrO2Catalysts

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Effect of Support Acidity on Liquid-Phase Hydrogenation of Benzene to Cyclohexene over Ru–B/ZrO₂Catalysts