Platinum Nanoparticles Supported on Hierarchically Porous Aluminosilicate Nanospheres for Low-Temperature Catalytic Combustion of Volatile Organic Compounds
Yu Hao, Shaohua Chen, Huan Wang, Rui Chen, Pingchuan Sun, Tiehong Chen
Abstract
The hierarchically porous silica (NKM-5) and aluminosilicate (Al-NKM-5) supported platinum nanoparticles catalysts were prepared and investigated for the catalytic combustion of toluene and ethanol. The Pt/NKM-5 and Pt/Al-NKM-5 catalysts displayed the submicrometer spherical morphology and the hierarchical pore structure, and the Pt nanoparticles were uniformly distributed. The Pt/NKM-5 and Pt/Al-NKM-5 showed excellent low-temperature catalytic activity and CO2 selectivity, and the hierarchical pores were beneficial to the catalytic combustion of toluene. With the increase of Al content, the catalytic activity of Pt/Al-NKM-5 increased gradually; the Pt/Al-NKM-5-5 catalyst with Si/Al = 5 showed the most excellent catalytic activity with 90% toluene conversion at 146 °C and 90% ethanol conversion at 138 °C. The NMR and NH3-TPD showed that the incorporation of Al could increase the acidity of support, which could promote the distribution of Pt and the adsorption of toluene as characterized by UV–vis, TEM, CO pulse chemisorption, and FTIR. The excellent catalytic activity of Pt/Al-NKM-5-5 could be ascribed to the hierarchically porous structure, more acidic sites, and higher Pt dispersity.