Palladium silica nanosphere-catalyzed decomposition of formic acid for chemical hydrogen storage
Palladium silica nanosphere-catalyzed decomposition of formic acid for chemical hydrogen storage
复制标题
DOI：
10.1039/c2jm32776g
复制
发表时间：
2012-01-01
影响因子：
--
通讯作者：
Xu, Qiang
中科院分区：
文献类型：
--
作者：
Yadav, Mahendra;Singh, Ashish Kumar;Xu, Qiang
以Pd(NH3)(4)Cl2为前驱体，在聚氧乙烯-壬基苯醚/环己烷反胶束体系中，采用NaBH4还原法制备了Pd纳米粒子(Pd@SiO_2)(Pd@SiO_2)(20~35 nm)。采用传统的Pd(NH3)(4)Cl2前驱体浸渍二氧化硅纳米球的方法制备了二氧化硅纳米球负载的钯纳米粒子(Pd/SiO_2)，采用类似的反胶束体系制备了不含Pd前驱体的二氧化硅纳米球(Pd/SiO_2)。与工业二氧化硅负载的Pd纳米粒子相比，合成的Pd@SiO_2和Pd/SiO_2催化剂对甲酸在适宜的温度下分解具有较高的催化活性，有利于化学储氢。值得注意的是，已经观察到Pd纳米颗粒与二氧化硅载体表面基团的相互作用对催化性能是重要的。
Palladium nanoparticles (Pd NPs) encapsulated within hollow silica nanospheres (Pd@SiO2) (20-35 nm) were synthesized using Pd(NH3)(4)Cl-2 as precursor in a polyoxyethylene-nonylphenyl ether/cyclohexane reversed micelle system followed by NaBH4 reduction. Pd NPs supported on silica nanospheres (Pd/SiO2) were prepared by the conventional impregnation of Pd(NH3)(4)Cl-2 precursor to silica nanospheres, which were prepared using a similar reversed micelle system without Pd precursor, followed by NaBH4 reduction. The as-sythesized Pd@SiO2 and Pd/SiO2 catalysts have high catalytic activities, in comparison to Pd NPs supported on commercial silica, for the decomposition of formic acid at convenient temperature for chemical hydrogen storage. Remarkably, it has been observed that the interactions of the Pd nanoparticles with surface groups of silica supports are important for the catalytic performance.