| dc.description.abstract | This thesis consists of two parts. In the first part of this study, the palladium nanoparticles (Pd NPs) are successfully confined within the 3D structure of the mesoporous nitrogen-doped carbon material N-CMK9 and the carbon material CMK-9. The mixture chemically reduced by reagent containing NaBH4 and NH3BH3 to obtain Pd(x)@CMK-9 and Pd(x)@N-CMK-9. It was found that N-CMK9 has a high specific surface area and defective CN sites, so that the palladium metal can be quickly and evenly dispersed in the pores of the N-CMK9. The polymer surfactant P123 was used as a template to synthesize with TEOS (Tetraethyl orthosilicate) under acidic conditions to obtain the mesoporous silicon KIT-6, which has a cubic structure with Ia3 ̅d symmetry. Using furfuryl alcohol as the carbon source and after carbonization, a 3D hollow-type ordered mesoporous carbon CMK-9 can be obtained. Since CMK-9 has a high specific surface area and a good pore volume, in addition of the nitrogen doped in the mesoporous material (N-CMK9) which can be used as a carrier. It can enhance the dispersion and improve the catalytic activity. In this experiment, the Pd(x)@N-CMK9 and Pd(x)@CMK9 were used in the Suzuki coupling catalytic reaction, furthermore compare 3D carbon material and nitrogen-doped carbon material, different base and different solvent respectively. Among all the as-prepared catalysts, Pd(10)@N-CMK9 exhibited the highest turnover frequency (TOF) of 1965.4 h-1. In this study, Pd(10)@N-CMK9 is an excellent high active catalyst for Suzuki coupling reaction.
In the second part of the study, a mesoporous N-doped carbon material (N-CMK9) was synthesized by nanocasting, and palladium nanoparticles were supported to N-CMK9 as a catalytic catalyst. N-doped carbon material N-CMK9 not only has defective CN sites and nitrogen gaps can be used to uniformly disperse palladium metal particles, but also improve catalytic activity. CMK-9 and N-CMK9 were impregnated with palladium metal ion precursor solution, and the metal ions were reduced to metal nanoparticles by chemical reduction method (Pd@CMK-9, Pd@N-CMK9). It was used as the catalyst for the reduction of 4-nitrophenol besides explored the effects of different carriers and different amounts of impregnated metal on the catalytic activity. In the study of the catalytic reduction of 4-Nitrophenol, Pd(5)@N-CMK9 exhibited the highest turnover frequency of 80467.3 s-1g-1. | en_US |