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首页> 外文期刊>Catalysis science & technology >Controlled synthesis of Pd-NiO@SiO2 mesoporous core-shell nanoparticles and their enhanced catalytic performance for p-chloronitrobenzene hydrogenation with H-2
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Controlled synthesis of Pd-NiO@SiO2 mesoporous core-shell nanoparticles and their enhanced catalytic performance for p-chloronitrobenzene hydrogenation with H-2

机译：PD-NIO@SIO2介孔核壳纳米颗粒的受控合成及其对p-氯硝基苯氢与H-2的催化性能增强

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摘要

In this work, Pd-NiO@SiO2 core-shell mesoporous nanocatalysts with similar to 4 nm Pd-NiO heteroaggregate nanoparticle cores and similar to 17 nm mesoporous silica shells were successfully synthesized by a sol-gel method. The surfactant-capped PdNi alloy nanoparticles were coated with SiO2 through hydrolysis of tetraethylorthosilicate to obtain PdNi@SiO2 nanoparticles, and the mesoporous Pd-NiO@SiO2 core-shell nanocatalysts were formed after removal of surfactants by calcination at 500 degrees C and subsequent H-2 reduction at 200 degrees C. The characterization results by XRD, TEM and BET revealed that Pd-NiO@SiO2 nanocatalysts were highly stable with the maintenance of intact core-shell structures under high-temperature thermal treatments. The Pd-NiO@SiO2 nanocatalysts illustrated a superior catalytic performance for p-chloronitrobenzene hydrogenation with H-2 to the control Pd@SiO2 nanocatalysts. The catalytic performance enhancement of Pd-NiO@SiO2 nanocatalysts is ascribed to the strong interaction between Pd and NiO in the cores, where the interfaces may be beneficial for hydrogenation reactions.
机译：在这项工作中，PD-NIO@SIO2核壳中孔纳米催化剂具有类似于4 nm PD-Nio HeteroAggregate纳米颗粒核，与17 nm介孔硅胶相似，由溶胶凝胶方法成功合成。通过四乙基硅酸盐的水解将表面活性剂封建的PDNI合金纳米颗粒与SIO2涂层，从而获得PDNI@SIO2纳米颗粒，并在500摄氏度下，在500级corefactins core core@siO2 core@sio2 core-shell nanocatalyst中形成了500级和分子C的core-shell nanocatalyst。 2在200度C下降低。XRD，TEM和BET的表征结果表明，PD-NIO@SIO2纳米催化剂在高温热处理下保持完整的核心壳结构非常稳定。 PD-NIO@SIO2纳米催化剂说明了用H-2与控制PD@SIO2纳米催化剂的P-氯硝基苯氢化的出色催化性能。 PD-NIO@SIO2纳米催化剂的催化性能增强归因于核心中PD和NIO之间的强相互作用，在该核心中，该接口可能对氢化反应有益。

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