Find in Library

A large surface area dendritic mesoporous silica material (KCC-1) was successfully synthesized and used as a support to confine SnO₂ nanoparticles (NPs). Owing to the large specific surface area and abundant mesoporous structure of dendritic KCC-1, the SnO₂ NPs were highly dispersed, resulting in significantly improved CO catalytic oxidation activity. The obtained Sn<i>_x</i>/KCC-1 catalysts (<i>x</i> represents the mass fraction of SnO₂ loading) exhibited excellent CO catalytic activity, with the Sn₇@KCC-1 catalyst achieving 90% CO conversion at about 175 °C. The SnO₂ NPs on the KCC-1 surface in a highly dispersed amorphous form, as well as the excellent interaction between SnO₂ NPs and KCC-1, positively contributed to the catalytic removal process of CO on the catalyst surface. The CO catalytic removal pathway was established through a combination of in situ diffuse reflectance infrared transform spectroscopy and density-functional theory calculations, revealing the sequential steps: ① CO → CO₃²⁻_ads, ② CO₃²⁻_ads → CO_2<i>free</i>+SnO<i>_x</i>₋₁, ③ SnO<i>_x</i>₋₁+O₂ → SnO<i>_x</i>₊₁. This study provides valuable insights into the design of high-efficiency non-precious metal catalysts for CO catalytic oxidation catalysts with high efficiency.