离子聚合物微球负载钯催化甲酸分解产氢

催化甲酸分解产氢是氢气储存和氢能利用的重要途径。以对乙烯基吡啶和1,3,5-三(溴甲基)-2,4,6-三甲基苯为原料，通过季胺化和聚合，制备了树枝状离子聚合物微球。负载Pd纳米粒子后用于催化甲酸分解产氢。微球的离子交换性能、含N特性以及分子内部空穴使制备的Pd 纳米粒子具有高分散性、小尺寸、均一粒径和优化的电子结构。考察了甲酸浓度和反应温度对产氢速率的影响。结果表明，在50℃、甲酸浓度为1 M、甲酸与钯摩尔比为200、甲酸与甲酸钠摩尔比为3的优化反应条件下，甲酸完全分解时间为30 min。催化剂使用4次后活性无明显下降。

Formic Acid Decomposition to Hydrogen Catalyzed by Ionic Polymer Microspheres Supported Palladium

Catalytic formic acid decomposition to hydrogen is an important route for hydrogen storage and hydrogen energy utilization. Dendritic ionic polymer microspheres are prepared by quaternization and polymerization using p-vinylpyridine and 1,3,5-tris(bromomethyl)-2,4,6-trimethylbenzene as the precursors. After being loaded with Pd nanoparticles, they are used to catalyze decomposition of formic acid to hydrogen. Pd nanoparticles with high dispersion, small size, uniform particle size distribution and optimized electronic structure are obtained, which is benefited from the ion-exchange, N-rich characteristic, and intramolecular cavity of the microspheres. The effects of formic acid concentration and reaction temperature on the hydrogen production rate are investigated. The results indicate that formic acid can be completely decomposed within 30 min under the optimized reaction conditions (50 _^oC, 1 M of formic acid, the molar ratios of formic acid to palladium and sodium formate are 200 and 3, respectively). There is no significant decrease in the activity after the catalyst is used for 4 times.