Platinum nanoparticles confined in imidazolium-based ionic polymer for assembling a microfluidic reactor with enhanced catalytic activity

Fang, Haobin; Chen, Junxing; Xiao, Yali; Zhang, Jianyong

doi:10.1016/j.apcata.2019.117186

Cited by 10 publications

(5 citation statements)

References 83 publications

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“…Different from previous works [49,[62][63][64][65][66], our study presents a hydrosilylation reaction carried out under microwave-assisted heating, which enables rapid and direct heating of the reaction medium and very short reaction times. In this short reaction time of 5 min, near quantitative conversion was achieved, whereas in previous works, the reaction time was 2 h or more [49,[62][63][64][65][66]. Metal nanoparticles can absorb microwave irradiation very well and serve as hot spots [68,69].…”

Section: Discussionmentioning

confidence: 99%

“…Many other Pt-NP catalysts in the literature gave ratios between 3.3 and 9.0 [63][64][65]. Only Pt 1 /NaY [49] and C-Pt/ImIP-2BrB [66] yielded even lower distal/proximal ratios below one (Table 1). For comparison, with H 2 PtCl 6 •6H 2 O and sugar-free Pt-NPs, a distal/proximal ratio of 1.9 was obtained in the hydrosilylation reaction under identical conditions, which was similar to the SC-Pt-NS catalysts and suggests that the temperature is a decisive factor for the distal/proximal ratio.…”

Section: Hydrosilylation Catalysismentioning

confidence: 91%

“…In the literature, the hydrosilylation catalysis is mostly carried out at reaction temperatures below 110 • C, with reaction times between 1.3 and 24 h. While the methods differ, the reaction times seem to be chosen so as to give high conversion [49,[62][63][64][65][66]. The thermal reactions in the literature are longer, but they are carried out in many cases with ppm amounts of Pt precursors.…”

Section: Hydrosilylation Catalysismentioning

confidence: 99%

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Sweet, Sugar-Coated Hierarchical Platinum Nanostructures for Easy Support, Heterogenization and Separation

et al. 2022

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Metal nanoparticles are increasingly gaining interest in the field of heterogeneous catalysis. Here, we present a novel strategy for synthesizing sugar-coated platinum nanostructures (SC-Pt-NS) from the carbohydrates sucrose and D(-)-fructose. In the synthesis from a mixture of H2PtCl6·6H2O, the carbohydrate in an ionic liquid (IL) yielded primary particles of a homogeneous average size of ~10 nm, which were aggregated to hierarchical Pt nanostructures of ~40–65 nm and surrounded or supported by the carbohydrate. These sugar-coated platinum nanostructures present a facile way to support and heterogenize nanoparticles, avoid leaching and enable easier separation and handling. The catalytic activity of the SC-Pt-NS was shown in the hydrosilylation test reaction of phenylacetylene with triethylsilane, where very high turnover frequency (TOF) values of up to 87,200 h−1 could be achieved, while the platinum metal leaching into the product was very low.

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Section: Discussionmentioning

confidence: 99%

Section: Hydrosilylation Catalysismentioning

confidence: 91%

Section: Hydrosilylation Catalysismentioning

confidence: 99%

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Sweet, Sugar-Coated Hierarchical Platinum Nanostructures for Easy Support, Heterogenization and Separation

et al. 2022

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“…These efforts are supported by modelling studies (Section 3), improving understanding of the relevant processes and properties. Besides IPMCs, there are several other ionic polymer transducers emerging that show similar macroscopic behavior, and may evolve faster into application-mature transducers [163,196,197,198,199,200]. Completely new transducer materials may evolve when modifying internal topology of IPMCs, and potentially combining ionic, electronic and passive transduction processes.…”

Section: Discussionmentioning

confidence: 99%

Sensing and Self-Sensing Actuation Methods for Ionic Polymer–Metal Composite (IPMC): A Review

MohdIsa

Hunt

HosseinNia

2019

Sensors

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Ionic polymer–metal composites (IPMC) are smart material transducers that bend in response to low-voltage stimuli and generate voltage in response to bending. IPMCs are mechanically compliant, simple in construction, and easy to cut into desired shape. This allows the designing of novel sensing and actuation systems, e.g., for soft and bio-inspired robotics. IPMC sensing can be implemented in multiple ways, resulting in significantly different sensing characteristics. This paper will review the methods and research efforts to use IPMCs as deformation sensors. We will address efforts to model the IPMC sensing phenomenon, and implementation and characteristics of different IPMC sensing methods. Proposed sensing methods are divided into active sensing, passive sensing, and self-sensing actuation (SSA), whereas the active sensing methods measure one of IPMC-generated voltage, charge, or current; passive methods measure variations in IPMC impedances, or use it in capacitive sensor element circuit, and SSA methods implement simultaneous sensing and actuation on the same IPMC sample. Frequency ranges for reliable sensing vary among the methods, and no single method has been demonstrated to be effective for sensing in the full spectrum of IPMC actuation capabilities, i.e., from DC to ∼100 Hz. However, this limitation can be overcome by combining several sensing methods.

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“…[29] Furthermore, increasing restrictions imposed by governments and the United Nations protocols with the aim of eliminating toxic chemical processes require adopting safer procedures. In this context, researchers have studied systems with metals, such as Mn, [30] Ni, [31][32][33] Ru, [34,35] Co, [36][37][38] Rh, [39][40][41] Ir, [42][43][44][45] Pd, [46,47] and Pt [48] immobilized on zeolite, [49,50] silica, [50,51] polymers, [52][53][54] alumina, [55] magnetite, [39,[56][57][58][59] and carbon. [60] These systems exhibit moderate to excellent conversion and selectivity, especially in the hydrogenation reactions.…”

Section: Introductionmentioning

confidence: 99%

Platinum Nanoparticle Based Dip‐Catalyst for Facile Hydrogenation of Quinoline, Unfunctionalized Olefins, and Imines

et al. 2020

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Developing a bio‐inspired catalyst with the efficiency of homogeneous catalysts and recyclability similar to heterogeneous catalysts is quite desirable but challenging. Incorporation of metal nanoparticles (<10 nm) on abundant, low‐cost supports from agricultural waste can yield highly active and product‐selective pseudo‐homogeneous catalysts, with attributes such as ease of retrieval for next use, reusability, etc. In this work, the fabrication of an efficient and reusable ‘dip‐catalyst’ by anchoring platinum nanoparticles on white jute plant (Corchorus capsularis) stems (JPS) and its use for the hydrogenation of N‐heteroarenes, unfunctionalized olefins, and imines are described. The catalyst was characterized using XRD, SEM, EDS, TEM, HRTEM, FTIR, and XPS, and TEM shows spherical (average diameter 4–5 nm) non‐agglomerated metal nanoparticles. Catalyst was used for the chemoselective (>99 % selectivity) hydrogenation of quinoline with a quantitative (>99 %) conversion to 1,2,3,4‐tetrahydroquinoline (py‐THQ) under hydrogen at a pressure <30 bar. Also, functional group tolerance is indicated by the quantitative hydrogenation of 6‐chloroquinoline to 6‐chloro‐1,2,3,4‐tetrahydroquinoline, which is a longstanding challenge owing to C−Cl bond cleavage. In the hydrogenation of structurally‐challenging trisubstituted trans‐2‐methyl‐3‐phenyl‐2‐propen‐1‐ol olefins, 64 % conversion and >99 % selectivity was achieved. A series of imines with different chain lengths was also hydrogenated selectively in methanol with >99 % conversion. Density functional theory (DFT) calculations reveal the efficient adsorption of 6‐chloroquinoline on the surface of Pt nanoparticles on Pt@JPS strips in a tilted orientation placing the C−Cl bond away from the metal and allowing facile desorption of 6‐chloro‐1,2,3,4‐tetrahydroquinoline leading to higher chemoselectivity. The spent catalyst can be reused for 12 consecutive cycles without significant damage to the cellulosic surface.

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Platinum nanoparticles confined in imidazolium-based ionic polymer for assembling a microfluidic reactor with enhanced catalytic activity

Cited by 10 publications

References 83 publications

Sweet, Sugar-Coated Hierarchical Platinum Nanostructures for Easy Support, Heterogenization and Separation

Sweet, Sugar-Coated Hierarchical Platinum Nanostructures for Easy Support, Heterogenization and Separation

Sensing and Self-Sensing Actuation Methods for Ionic Polymer–Metal Composite (IPMC): A Review

Platinum Nanoparticle Based Dip‐Catalyst for Facile Hydrogenation of Quinoline, Unfunctionalized Olefins, and Imines

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