Preparation of mesoporous Pd/Si3N4 nanocomposites as heterogeneous catalysts via three different chemical routes
Preparation of mesoporous Pd/Si3N4 nanocomposites as heterogeneous catalysts via three different chemical routes
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通过三种不同的化学路线制备介孔Pd/Si3N4纳米复合材料作为非均相催化剂
DOI：
10.1021/cm061106h
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发表时间：
2006
影响因子：
8.6
通讯作者：
F. Lefebvre
中科院分区：
文献类型：
--
作者：
F. Cheng;S. Kelly;N. A. Young;Christopher N. Hope;Katie M Beverley;M. G. Francesconi;S. Clark;J. S. Bradley;F. Lefebvre
通过三种不同的化学路线制备介孔钯/氮化硅纳米复合材料，以同时控制钯纳米粒子和氮化硅载体的固态形貌，同时控制孔径和尺寸分布。二酰亚胺硅凝胶与 PdCl2 的反应产物在 NH3 流下于 1000 °C 下热解，得到分散在 α-Si3N4 基质中的高度结晶的 Pd 纳米颗粒的复合材料。通过氮化硅与 PdCl2 反应产物的氢还原，获得了部分结晶的 Pd 纳米颗粒分散在非晶 Si3N4 基体中的复合材料，而 Si3N4 与双（二亚苄基丙酮）钯（DBA）的浸渍混合物的氢还原导致形成了非晶 Pd 纳米颗粒分散在非晶 Si3N4 基体中的复合材料。这些新型介孔纳米复合材料中的大多数表现出> 400 m2 g-1的高表面积和窄孔径分布......
Mesoporous palladium/silicon nitride nanocomposites were prepared via three different chemical routes to generate simultaneous control of the solid-state morphology of the palladium nanoparticles and that of the silicon nitride support at the same time as controlling the pore size and size distribution. Pyrolysis of the reaction product of silicon diimide gel with PdCl2 under a NH3 flow at 1000 °C gave a composite with highly crystalline Pd nanoparticles dispersed in an α-Si3N4 matrix. A composite with partially crystallized Pd nanoparticles dispersed in an amorphous Si3N4 matrix was obtained by the hydrogen reduction of the reaction product of silicon nitride with PdCl2, whereas hydrogen reduction of an impregnated mixture of Si3N4 with bis(dibenzylideneacetone)palladium (DBA) led to the formation of a composite with amorphous Pd nanoparticles dispersed in an amorphous Si3N4 matrix. Most of these new mesoporous nanocomposites exhibit a high surface area >400 m2 g-1 and a narrow pore size distribution of ...