New understanding and controllable synthesis of silica hollow microspheres with size-tunable penetrating macroporous shells as a superior support for polystyrene hydrogenation catalysts

Pan, Deng; Shi, Gang; Zhang, Teng; Yuan, Pei; Yu, Fan; Bao, Xiaojun

doi:10.1039/c3ta11824j

Cited by 25 publications

(15 citation statements)

References 40 publications

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“…The preparation method for the silica support was through the ternary water/oil/water (W/O/W) emulsion system as described in our previous work. 33 First, an oil phase (a 72 mL solution of Tween 80 (1.5 g) and Span 80 (1.5 g) in n -hexane) and water phase (14.0 g of sodium silicate solution, 22.0 g of deionized water and 1.6 g of sodium polyacrylate) were emulsified using a homogenizer (JB-12KD) with 10 000 rpm for 1 min to form a stable W/O emulsion. Then, this mixture was added into the outer water phase (250 mL of 2 M NH 4 HCO 3 solution) to form a W/O/W emulsion system.…”

Section: Methodsmentioning

confidence: 99%

Synthesis of Pd/SiO₂ Catalysts in Various HCl Concentrations for Selective NBR Hydrogenation: Effects of H⁺ and Cl^– Concentrations and Electrostatic Interactions

et al. 2018

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A series of silica supported Pd (Pd/SiO 2 ) catalysts were prepared in various HCl concentrations ( C HCl ) of the impregnation solution with different electrostatic interactions between Pd precursor and support, and their catalytic properties were evaluated by the selective hydrogenation of nitrile butadiene rubber (NBR). The results show that with the C HCl increasing from 0.1 to 5 M, the particle size of Pd nanoparticles dramatically decreases from 24.2 to 5.1 nm and stabilizes at ∼5 nm when C HCl is higher than 2 M. Using the catalysts prepared with a high C HCl (>2 M), an excellent hydrogenation degree (HD) of ∼94% with 100% selectivity to C=C can be acquired under mild conditions. Interestingly, the HD could be remarkably increased from 65 to 92% by increasing only C Cl – from 0.1 to 2 M with the addition of NaCl while keeping C H + at 0.1 M. This is because PdCl 4 2– is the predominant existing form of precursor at high C Cl – , which has a strong electrostatic attraction with the positively charged support favorable for the formation of small-sized Pd nanoparticles over silica. Notably, Pd leaching behavior during the hydrogenation reaction is closely related to C H + , and the higher the C H + , the less Pd residues are detected in the hydrogenated NBR. Our contribution is to provide a facile strategy to synthesize effective and stable Pd/SiO 2 catalysts via adjusting the electrostatic interaction, which exhibits a high activity and selectivity for NBR hydrogenation.

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Section: Methodsmentioning

confidence: 99%

Synthesis of Pd/SiO₂ Catalysts in Various HCl Concentrations for Selective NBR Hydrogenation: Effects of H⁺ and Cl^– Concentrations and Electrostatic Interactions

et al. 2018

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“…Nowadays, the hollow inorganic functional materials has received much attention compared with solid counterparts because of their low density, high surface area, good surface permeability, large and light-harvesting efficiency 1 2 3 4 5 . As a result, hollow structures have been widely applied in catalysis fields such as photocatalysis, hydrogenation, alcohols oxidation, lipases immobilized, methane decomposition, the oxygen reduction reaction et al 6 7 8 9 10 11 12 . Li and co-workers fabricated the ultra-small Ag nanocrystallite-decorated TiO 2 hollow spheres by using a two-step hydrothermal method to improve photocatalytic performance 6 .…”

mentioning

confidence: 99%

Preparation of Hollow CuO@SiO2 Spheres and Its Catalytic Performances for the NO + CO and CO Oxidation

Niu

Zhao

Yuan

et al. 2015

Sci Rep

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The hollow CuO@SiO2 spheres with a mean diameter of 240 nm and a thin shell layer of about 30 nm in thickness was synthesized using an inorganic SiO2 shell coating on the surface of Cu@C composite that was prepared by a two-step hydrothermal method. The obtained hollow CuO@SiO2 spheres were characterized by ICP-AES, nitrogen adsorption-desorption, SEM, TEM, XRD, H2-TPR, CO-TPR, CO-TPD and NO-TPD. The results revealed that the hollow CuO@SiO2 spheres consist of CuO uniformly inserted into SiO2 layer. The CuO@SiO2 sample exhibits particular catalytic activities for CO oxidation and NO + CO reactions compared with CuO supported on SiO2 (CuO/SiO2). The higher catalytic activity is attributed to the special hollow shell structure that possesses much more highly dispersed CuO nanocluster that can be easy toward the CO and NO adsorption and the oxidation of CO on its surface.

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“…Silica hollow microspheres with size-tunable penetrating macropores from 250 nm to 560 nm were prepared by a water/oil/water ternary phase emulsion system, which can serve as a superior support to fabricate supported palladium catalysts for hydrogenation of bulky polystyrene molecules [3]. The hydrogenation reaction was confirmed to be a first-order reaction and the activation energy was calculated to be 58.3 kJ/mol.…”

Section: Silica Microspheres Supported Palladium Catalystmentioning

confidence: 99%

New advances in catalysts for polystyrene hydrogenation

et al. 2020

E3S Web Conf.

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New understanding and controllable synthesis of silica hollow microspheres with size-tunable penetrating macroporous shells as a superior support for polystyrene hydrogenation catalysts

Cited by 25 publications

References 40 publications

Synthesis of Pd/SiO₂ Catalysts in Various HCl Concentrations for Selective NBR Hydrogenation: Effects of H⁺ and Cl^– Concentrations and Electrostatic Interactions

Synthesis of Pd/SiO₂ Catalysts in Various HCl Concentrations for Selective NBR Hydrogenation: Effects of H⁺ and Cl^– Concentrations and Electrostatic Interactions

Preparation of Hollow CuO@SiO2 Spheres and Its Catalytic Performances for the NO + CO and CO Oxidation

New advances in catalysts for polystyrene hydrogenation

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New understanding and controllable synthesis of silica hollow microspheres with size-tunable penetrating macroporous shells as a superior support for polystyrene hydrogenation catalysts

Cited by 25 publications

References 40 publications

Synthesis of Pd/SiO2 Catalysts in Various HCl Concentrations for Selective NBR Hydrogenation: Effects of H+ and Cl– Concentrations and Electrostatic Interactions

Synthesis of Pd/SiO2 Catalysts in Various HCl Concentrations for Selective NBR Hydrogenation: Effects of H+ and Cl– Concentrations and Electrostatic Interactions

Preparation of Hollow CuO@SiO2 Spheres and Its Catalytic Performances for the NO + CO and CO Oxidation

New advances in catalysts for polystyrene hydrogenation

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Synthesis of Pd/SiO₂ Catalysts in Various HCl Concentrations for Selective NBR Hydrogenation: Effects of H⁺ and Cl^– Concentrations and Electrostatic Interactions

Synthesis of Pd/SiO₂ Catalysts in Various HCl Concentrations for Selective NBR Hydrogenation: Effects of H⁺ and Cl^– Concentrations and Electrostatic Interactions