Here, a comparison between four mesoporous siliceous compounds is conducted to investigate the effect of support on formation and catalytic behavior of palladium (Pd) nanoparticles. The four investigated supports are: the commercially available MCM-41, SBA-15 and MCM-48, in addition to the home-made TUD-1 material. The same amount of Pd (Si/Pd = 200) was impregnated in the four mesoporous samples by using water as a solvent, and no further activation/reduction was performed. The obtained characterization data showed that SBA-15 accommodated the maximum amount of PdO nanoparticles that located inside its channels, while the maximum surface area after impregnation was obtained in MCM-48 sample. The four Pd samples was used to catalyze the solvent-free reduction of cyclopentene at room temperature by using 1 atm of hydrogen gas. Pd-TUD-1 exhibited the maximum activity with a total TOF of 4.83 s⁻¹, while the TOF of SBA-15 was 2.28 s⁻¹. The activity results clearly show the effect of the open three dimensional structure of TUD-1 in offering the maximum accessibility to and from Pd nanoparticles’ active sites.

在这里，进行了四种介孔硅质化合物之间的比较，以研究载体对钯（Pd）纳米颗粒形成和催化行为的影响。除了自制的TUD-1材料外，研究的四种支持物还有：市售的MCM-41，SBA-15和MCM-48。通过使用水作为溶剂，在四个中孔样品中浸渍了相同量的Pd（Si / Pd = 200），并且没有进行进一步的活化/还原。获得的表征数据表明，SBA-15容纳了位于其通道内的最大数量的PdO纳米颗粒，而在MCM-48样品中获得了浸渍后的最大表面积。在室温下，使用1个大气压的氢气，使用这四个Pd样品催化环戊烯的无溶剂还原。^-1，而SBA-15的TOF为2.28 s ^-1。活性结果清楚地显示了TUD-1的开放式三维结构在提供最大的Pd纳米颗粒活性位点可及性方面的作用。