不同形貌AuAg/SBA-15的微波可控合成及其催化性能研究

摘要

AuAg/SBA-15 catalysts with different morphology were synthesized by using the microwave-assistant method. The characterization results revealed that AuAg nanoparticals were embedded in the porous of SBA-15 mesoporous zeolite,which increased the interaction between the active sites and the support, thus enlarged the catalyst stability. The p-nitrophenol reduction results showed that the platelet AuAg/SBA-15 with large pore size and short pore length possessed high p-nitrophenol reduction activity.%采用微波辅助合成的方法制备出不同形貌的AuAg/SBA-15催化剂.表征结果表明:AuAg合金纳米粒子被限域在SBA-15介孔分子筛的孔道中,增强了活性组分与载体间的作用力,提高了催化剂的稳定性.4-硝基苯酚还原性能结果表明:催化剂的孔径和孔道结构对其催化性能具有重要的影响,其中具有短孔道和大孔径的片状AuAg/SBA-15表现出较好的扩散性能,并在4-硝基苯酚还原反应中具有较高的活性.