1 research outputs found
Advanced Insight into the Size Effect of PtPd Nanoparticles on NO Oxidation by <i>in Situ</i> FTIR Spectra
It
is a recognized view that particle size could play a significant
role in catalytic performance. To obtain the nanoparticles with the
different size, a series of bimetallic PtPd/SiO<sub>2</sub>–Al<sub>2</sub>O<sub>3</sub> catalysts subjected to hydrothermal treatment
in different time were prepared and applied for NO oxidation under
diesel exhaust. The experimental results confirmed that the average
noble particle size was gradually increased at a different variation
rate, along with aging time. An increasing of average particle size
resulted in the reduction of the corresponding NO turnover frequencies
(TOFs) by different degrees. Thus, a new sight on the relationship
between particle size and NO catalytic activity is obtained. In the
aging process, the overall trend of noble metal particles got larger
along with receding NO catalytic performance, yet in a period, a few
small particles presented more bridged/chelating nitrate and ionic
nitrate species, further retarding its rate of loss activity