Herein, we present a facile approach for the synthesis of polymeric ionic liquids (PILs) microspheres for metal scavenging and catalysis. Crosslinked poly(1-butyl-3-vinylimidazolium bromide) microspheres with the diameter of about 200 nm were synthesized via miniemulsion polymerization, in which 1,4di(vinylimidazolium) butane bisbromide was added as the crosslinker. Anion exchange of PIL microspheres with Pt precursor and followed by the reduction of Pt ions produced PIL microsphere supported Pt nanoparticle hybrids. The synthesized Pt nanoparticles with a diameter of about 2 nm are uniformly dispersed and strongly bound to the surface of PIL microspheres. The catalytic performances of PIL/Pt nanoparticle hybrids were evaluated for both the electrocatalytic oxidation of methanol and oxidation of benzyl alcohol. The PIL/Pt nanoparticle hybrids show better electrocatalytic activity towards the electrooxidation of methanol than pure Pt nanoparticles. Furthermore, they are effective and easily reusable catalysts for the selective oxidation of benzyl alcohol in aqueous reaction media, demonstrating that the synthesized PIL microspheres are suitable scaffolds for heterogeneous catalysts Pt. V C 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 49: [4531][4532][4533][4534][4535][4536][4537][4538] 2011
NaNH 2 and NaBH 4 were utilized to prepare a composite hydrogen storage material, NaNH 2 -NaBH 4 . To improve the thermal decomposition kinetics of NaNH 2 -NaBH 4 , which is crucial for hydrogen-release performance, Ni-Co-B was selected as a catalyst. To prepare the catalyst-promoted light-weight hydrogen storage materials, a composite hydrogen storage system was synthesized via a ball milling method with NaNH 2 , NaBH 4 , and Ni-Co-B. X-ray diffraction patterns show that the crystal structure of the NaNH 2 -NaBH 4 is well maintained after adding catalysts. In addition, Na 3 BN 2 and metal Na were detected as by-products in the Ni-Co-B-promoted NaNH 2 -NaBH 4 (with a molar ratio of 2:1) after the thermal decomposition process. In addition, thermogravimetry-differential thermal analysis indicates that the main decomposition stages of the metal boride-promoted NaNH 2 -NaBH 4 materials were split into three stages. Furthermore, the catalytic effects on the thermal decomposition kinetics were evaluated. The activation energy of the Ni-Co-B-promoted NaNH 2 -NaBH 4 below 250 C is 99 kJ/mol, which is only 62.0% of that of pristine NaNH 2 -NaBH 4 (2/1), implying better kinetics in the low temperature decomposition range. V C 2014 AIP Publishing LLC. [http://dx.
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