Abstract: An air extrusion molding method for the preparation of mullite fiber ceramics with high porosity and high temperature stability was developed at a calcination temperature of 1250 ℃. The porous mullite ceramics showed a uniform pore size distribution and a porosity of 96.22%. The porous ceramics was used as the support for perovskite catalysts based on La0.8Sr0.2CoO3-δ, and the catalyst showed excellent activity and stability in the catalytic combustion of NO and CO. Pd doping enhanced the catalyst activity.

Key words: porous mullite fiber ceramics, palladium, supported catalyst, nitric oxide, carbon monoxide, oxidation