Deactivation of platinized alumina catalysts by coke deposits

Zharkov, B. B.; Medzhinskii, V. L.; Butochnikova, L. F.; Oranskaya, O. M.; Maryshev, V. B.

doi:10.1007/bf00725188

Cited by 1 publication

(1 citation statement)

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“…In contrast, some problems in the cyclohexane−benzene dehydrogenation reaction moiety remain, such as the high-temperature requirement and catalyst deactivation. − The deactivation is mainly derived from the formation of cokes over the catalyst surfaces, which heavily contaminate the catalyst active sites. This coke formation is generally induced by strong adsorption and long retention time of the product benzene over catalyst surfaces, − which become poor carbon-supported catalysts because of the strong π−π interaction between carbon materials and benzene . Intrinsically, decreasing the adsorption and residence time of benzene would be beneficial to the improvement of catalyst stability.…”

Section: Resultsmentioning

confidence: 99%

Hierarchical Porous Core−Shell Carbon Nanoparticles

Song

Zhao

et al. 2009

Chem. Mater.

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The excellent physical and chemical properties of porous carbon materials allow them to be widely used in many fields. Their performance in a specific application is usually determined by structural features such as pore diameter, channel length, and architecture. In recent years, great efforts have been made to develop suitable carbon-based materials with short pores and/or hierarchical porous architectures, for use in transport or diffusion of guest objects by reducing pathways and resistance. In the present paper, we report on a novel carbon nanostructure constructed with a mesoporous core and a microporous shell. The mesopore walls are constructed of only a few graphene layers and can be controllably removed by a wetting oxidation reaction, which leaves behind hollow nanoparticles. These short-pore structures could facilitate the diffusion of molecules; they also show a very high and stable catalytic performance during the dehydrogenation of cyclohexane that is far superior to currently available long-pore materials, such as active carbon and carbon nanotubes.

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