Platinum and palladium nanoparticles in modified mesoporous phenol—formaldehyde polymers as hydrogenation catalysts

A protector-free one-pot strategy to synthesize highly dispersed Pd hydrogenation catalysts in a broad loading range on polystyrene

“…[23][24][25] In addition, although some inorganic supports such as active carbon materials possessed rich functional groups on the surface and their nature could be easily manipulated at a proper temperature for optimizing the interaction with the loaded metal, controlling the size distribution of particles was still difficult 27,28 due to the uneven dispersing density of the functional groups on the surface, especially when metal loadings were altered to a relative higher amount. 29,30 In contrast, in our study, the introduction of a capturing group (VTC) in a proper amount to copolymerize on the surface of polystyrene (with the molar ratio of VTC : styrene at 0.05) was veried to be a feasible way to optimize the electrostatic state of polystyrene substrate, which consequently facilitated the uniform anchoring of Pd precursors and the following in situ reduction to narrow-size-range distributed Pd nanoparticles (ca. 3.0-5.0 nm) in a broad loading range (from 0.2 wt% to 4.6 wt%) under protector-free conditions.…”

“…3.0-5.0 nm) in a broad loading range (from 0.2 wt% to 4.6 wt%) under protector-free conditions. The ndings further indicated that the exible nature of PS-like polymer materials in both design and preparation 29,30 could be advantageous for conveniently synthesizing desired supported metal nanocatalysts.…”

“…According to the constructive comments of a reviewer, we have reported the features of some typical methods in literature to prepare Pd nanocatalysts and these features are shown in Table 2. In comparison with the various inorganic materialsupported Pd nanocatalysts, [22][23][24][25][26][27][28] the researches focused on the fact that Pd catalysts supported by organic materials just occupied a small fraction, 29,30 which might attribute to the relatively higher thermal stability of inorganic materials compared to that of the PS-like polymer materials. However, this thermal stability of inorganic supports also implied the inconvenience in adjusting their state, especially the surface state that would signicantly impact the conjunctive function with metal components.…”

Palladium Catalysts Based on Mesoporous Organic Materials in Semihydrogenation of Alkynes

“…MPF‐1 was modified with the PPI dendrimers of the third generation. The surface modification of the MPF‐1 material was performed in two stages: (1) chloromethylation and (2) the interaction of the activated polymer with the PPI dendrimer DAB(NH 2 ) 16 …”

“…The synthesis of a Pd catalyst based on the mesoporous phenol‐formaldehyde polymer modified with dendrimers was performed by the impregnation of the initial support with a solution of Pd(OAc) 2 followed by reduction with NaBH 4 . The solvent after impregnation was removed by centrifugation for the elimination of unadsorbed metal.…”