Hydroalkylation of benzene and ethylbenzene over Ru- and Ni-containing zeolite catalysts – novel catalytic route for ethylcyclohexylbenzene synthesis

Ivanova, I. I.; Borodina, I. B.; Пономарева, О. А.; Yuschenko, V.V.; Fajula, François; Bousquet, Jacques

doi:10.1016/s0167-2991(07)80982-7

Cited by 2 publications

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“…Third, the cycling stability of catalysts was not satisfying and needs to further improved, which is critical for the practical applications. 30,31 In the present work, a modified weakly capping growth approach (WCGA) 32 was employed to prepare bifunctional metal/acid catalysts with uniformly distributed palladium nanoparticles (Pd NPs) on Hβ zeolite. Methanol was used as a mild chemical reducing agent instead of high-temperature reduction, thus avoiding the aggregation of dispersed Pd NPs.…”

Section: ■ Introductionmentioning

confidence: 99%

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Identification of Metal/Acid Matching Balance over Bifunctional Pd/Hβ toward Benzene Hydroalkylation

Huang

Yang

et al. 2021

Ind. Eng. Chem. Res.

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Bifunctional Pd/Hβ catalysts with uniformly distributed palladium nanoparticles (Pd NPs) were successfully synthesized by a facile methanol-mediated weakly capping growth approach (WCGA). A series of Pd/Hβ catalysts with different metal loadings and Si/Al ratios were used for benzene hydroalkylation, and the identification of metal/acid matching balance over bifunctional Pd/Hβ toward benzene hydroalkylation performance was investigated. The obtained characterization and catalytic activity test results demonstrated that the weak acid site and Lewis acid site have greatly affected the benzene conversion, and the strong acid site as well as Brønsted acid site had more of an effect on the alkylation process. The best hydroalkylation performance was achieved by tuning the acid/metal molar ratio at 22.4 μmol of H + /μmol of exposed Pd with a high cyclohexylbenzene (CHB) selectivity of 51.7% at a benzene conversion of 63.4%, which is the best CHB yield currently obtained for all we know. In addition, the stability of Pd/Hβ catalysts was tested and compared with that prepared by the incipient wetness impregnation (IWI) method, which showed good stability, and no obvious particle aggregation was found. This work provides guidance for exploring the construction of bifunctional catalysts and the balance of metal/acid sites.

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Section: ■ Introductionmentioning

confidence: 99%

“…Second, the exact effect of acid type and acid strength on CHB selectivity is ambiguous and needs to be further investigated. Third, the cycling stability of catalysts was not satisfying and needs to further improved, which is critical for the practical applications. , …”

Section: Introductionmentioning

confidence: 99%