中文摘要：

采用溶胶负载法制备了高分散的活性炭载纳米Au（Au/AC）,研究了其在室温下对低浓度臭氧的催化分解性能,并用N2吸附-脱附、扫描电镜、X射线光电子能谱等手段对反应前后的催化剂进行了表征.结果表明,与普通的传导加热方式相比,微波加热方式所制备的活性炭载Au颗粒的分布更均匀、尺寸更小,具有更高的催化臭氧分解性能.Au前驱体溶液pH值对Au/AC催化剂的臭氧分解性能有显著影响,以pH=8最佳.降低空速而延长臭氧与催化剂的接触时间可以提高催化剂对臭氧的分解性能.空速120000h^-1条件下,催化剂处理约1g臭氧后,臭氧去除率降低至78.6%;而60000h^-1条件下处理1.25g臭氧后,臭氧的去除率仍保持在93.3%.Au/AC催化剂在分解臭氧后,表面部分C被氧化而含氧量增加,但比表面积和孔容等变化不大,主要通过负载Au颗粒本身催化分解臭氧.

英文摘要：

Highly dispersed gold nanoparticles were supported on coal-based activated carbon by the sol immobilization method, and their catalytic activity for low-level ozone decomposition at ambient temperature was investigated. Nitrogen adsorption-desorption, scanning electron microscopy, and X-ray photoelectron spectroscopy were used to characterize the catalysts before and after ozone decomposition. The results showed that the supported gold nanoparticles prepared by the microwave heating method were much smaller and more uniformly dispersed on the activated carbon than those prepared by the traditional conduction heating method, exhibiting higher catalytic activity for ozone decomposition. The pH value of gold precursor solution significantly influenced the catalytic activity of supported gold for ozone decomposition, and the best was at pH = 8. Decreasing gas space velocity and correspondingly extending contact time between ozone and catalyst can improve the catalytic activity for the reaction. In the case of space velocity at 120 000 h^-1, the ozone removal ratio of the catalyst after treating about 1 g ozone decreased to 78.6%, while it kept at 93.3% after treating 1.25 g ozone in the case of space velocity at 60 000 h^-1. After ozone decomposition, the surface carbon of the catalyst was partly oxidized and the oxygen content accordingly increased, while its specific surface area and pore volume only decreased a little. Ozone was mainly catalytically decomposed by supported-gold itself.