Catalyst adhesion enhancement by porous TiO2 layer formed on anodized titanium honeycomb substrate

Titanium honeycomb substrates having TiO2 surface with nanoto micro-sized pores were prepared by electrochemical anodization and used to make Pt-based oxidation catalyst monoliths without conventional oxide based washcoat layers for pre-turbocharger catalyst (PTC) applications exposed to harsh conditions under very high flow rates of exhaust gas and engine vibration. Adhesion strength and CO/C3H6 oxidation performance of the catalysts were compared with conventional washcoated FeCrAl monolith catalysts. The intermediate porous TiO2 layer formation by the anodization can dramatically enhance the catalyst adhesion strength without sacrificing the catalytic performance under GHSV (gas hourly space velocity) higher than 100,000 h(-1) for PTC.

Automated summary

Titanium honeycomb substrates with TiO2 surface containing nanoto micro-sized pores were prepared by electrochemical anodization, demonstrating significantly enhanced catalyst adhesion strength without sacrificing catalytic performance under high exhaust gas flow rates.