Nanoscale Metal Oxide Catalyst for Low-Temperature Exhaust Purification

The patent employs a composite carrier structure consisting of Al2O3 combined with specific metal oxides (ZrO2, CeO2, Y2O3, Nd2O3, SiO2, or TiO2) in a nanoscale mixture. This composite material approach enables the catalyst to simultaneously achieve high thermal durability through the stable Al2O3 framework and effective low-temperature activity through the synergistic metal oxide components, thereby resolving the contradiction between temperature range and reliability.

The patent changes the physical parameter of metal oxide particle size to less than 10 nm, creating a nanoscale mixture that fundamentally alters the catalyst's performance characteristics. This parameter change enables the material to exhibit both high thermal stability and enhanced low-temperature reactivity, effectively bridging the performance gap between high-temperature durability and low-temperature effectiveness.

The patent applies parameter change by precisely controlling metal oxide particle size to less than 10 nm, which enhances low-temperature catalytic activity through increased surface area and quantum effects. Simultaneously, the nanoscale mixture with Al2O3 provides a stable framework that maintains thermal durability, thus resolving the contradiction between productivity at low temperatures and thermal stability.

The composite structure of Al2O3 with nanoscale metal oxides creates a synergistic effect where the Al2O3 matrix provides thermal stability while the fine metal oxide particles contribute low-temperature activity. This composite approach allows the system to achieve both high productivity at low temperatures and maintained thermal stability.