Properties of highly dispersed supported catalysts in hydrogenation reactions

Zakarina, N. A.; Zakumbaeva, G. D.; Kuidina, V. P.

doi:10.1007/bf02064401

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“…Zakarina et al studied the activity of Pd supported on different oxides (SiO 2 , Al 2 O 3 , and MgO) in hydrogenation of dimethylethynylcarbinol. No clear tendency was withdrawn.…”

Section: Resultsmentioning

confidence: 99%

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Size-Controlled Pd Nanoparticles in 2-Butyne-1,4-diol Hydrogenation: Support Effect and Kinetics Study

et al. 2014

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Structured catalyst has been developed for C−C triple bond three-phase hydrogenation. The sintered metal fiber (SMF) coated by different oxides served as support for monodispersed Pd nanoparticles (6.4 ± 0.5 nm). The effect of acid−base properties and reducibility of metal oxide coating on catalytic performance in the liquid phase (T = 303− 348 K; P = 1−20 bar) hydrogenation of 2-butyne-1,4-diol to 2-butene-1,4-diol (B2) has been studied. The oxides MgO, ZnO, Ga 2 O 3 , Al 2 O 3 , ZrO 2 , SnO 2 , and SiO 2 and the mixtures of MgO + ZnO + Al 2 O 3 , MgO + Al 2 O 3 , and ZnO + Al 2 O 3 were tested. The catalyst activity was higher up to 10-fold for Pd 0 on acidic supports, like SiO 2 , but demonstrated lower selectivity to B2 as compared to the basic oxides. The highest yield (∼99%) of the target B2 and stability over four consecutive runs were attained over the 0.2% Pd 0 /ZnO/SMF catalyst. The high selectivity to B2 was attributed to the formation of an active phase containing intermetallic PdZn alloy as confirmed by XPS. The reaction kinetics was modeled using a Langmuir−Hinshelwood mechanism and found consistent with the experimental data. The developed structured catalyst is suitable for a design of flow multiphase reactors to perform alkyne semihydrogenations in continuous mode.

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“…Zakarina et al studied the activity of Pd supported on different oxides (SiO 2 , Al 2 O 3 , and MgO) in hydrogenation of dimethylethynylcarbinol. No clear tendency was withdrawn.…”

Section: Resultsmentioning

confidence: 99%

“…with a difference of up to 10-fold between the most acidic (SiO 2 ) and the most basic (MgO) oxide.Zakarina et al49 studied the activity of Pd supported on different oxides (SiO 2 , Al 2 O 3 , and MgO) in hydrogenation of dimethylethynylcarbinol. No clear tendency was withdrawn.…”

mentioning

confidence: 99%