Micro-/Mesoporous Platinum-SiCN Nanocomposite Catalysts (Pt@SiCN): From Design to Catalytic Applications

作者：Sachau Sabrina M; Zaheer Muhammad; Lale Abhijeet; Friedrich Martin; Denner Christine E; Demirci Umit B; Bernard Samuel; Motz Guenter; Kempe Rhett

来源：Chemistry - A European Journal, 2016, 22(43): 15508-15512.

DOI：10.1002/chem.201603266

• block copolymers
• ceramics
• mesoporous materials
• self-assembly
• supported catalysts

The synthesis, characterization, and catalytic studies of platinum ( Pt) nanoparticles ( NPs) supported by a polymer-derived SiCN matrix are reported. In the first step and under mild conditions ( 110 degrees C), a block copolymer ( BCP) based on hydroxyl-group-terminated linear polyethylene ( PEOH) and a commercially available polysilazane ( PSZ: HTT 1800) were synthesized. Afterwards, the BCP was microphase separated, modified with an aminopyridinato ( Ap) ligand-stabilized Pt complex, and cross-linked. The green bodies thus obtained were pyrolyzed at 1000 degrees C under nitrogen and provided porous Pt@SiCN nanocomposite via decomposition of the PEOH block while Pt nanoparticles grew in situ within the SiCN matrix. Powder X-ray diffraction ( PXRD) studies confirmed the presence of the cubic Pt phase in the amorphous SiCN matrix whereas transmission electron microscopy ( TEM) measurements revealed homogeneously distributed Pt nanoparticles in the size of 0.9 to 1.9 nm. N-2 sorption studies indicated the presence of micro- and mesopores. Pt@SiCN appears to be an active and robust catalyst in the hydrolysis of sodium borohydride under harsh conditions.

• 出版日期2016-10