In:
Nanoscale, Royal Society of Chemistry (RSC), Vol. 13, No. 35 ( 2021), p. 15038-15047
Abstract:
Nanoparticles (NPs) of Pd 1−- x Ga x ( x = 0.67, 0.5, 0.33), stabilized in non-aqueous colloidal solution, were obtained via an organometallic approach under mild conditions using [Pd 2 (dvds) 3 ] and GaCp* as all-hydrocarbon ligated metal-precursor compounds (dvds = 1,1,3,3-tetramethyl-1,3-divinyl-disiloxane; Cp* = η 5 -C 5 Me 5 ; Me = CH 3 ). The reaction of the two precursors involves the formation of a library of molecular clusters [Pd n Ga m Cp* y (dvds) z ], as shown by liquid injection field desorption ionization mass spectrometry (LIFDI-MS). Full characterization of the catalytic system (HR-TEM, EDX, DLS, PXRD, XPS, NMR, IR, Raman) confirmed the formation of ultra-small, spherical NPs with narrow size distributions ranging from 1.2 ± 0.2 nm to 2.1 ± 0.4 nm (depending on the Pd : Ga ratio). The catalytic performance of the Pd 1−- x Ga x NPs in the semi-hydrogenation of terminal and internal alkynes and the influence of the gallium content on product selectivity were investigated. The highest activities (65%) and selectivities (81%) are achieved using colloids with a “stoichiometric” Pd/Ga ratio of 1 : 1 at 0 °C and 2.0 bar H 2 pressure. While lower Ga ratios lead to an increase in activity, higher Ga contents increase the olefin selectivity but are detrimental to the activity.
Type of Medium:
Online Resource
ISSN:
2040-3364
,
2040-3372
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2021
detail.hit.zdb_id:
2515664-0
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